Bochs/bochs/doc/docbook/user/user.dbk

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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V4.1//EN" [

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<book>
<bookinfo>
   <title>Bochs User Manual</title>
   <authorgroup>
   <author><firstname>Kevin</firstname><surname>Lawton</surname></author>
   <author><firstname>Bryce</firstname><surname>Denney</surname></author>
   <author><firstname>N. David</firstname><surname>Guarneri</surname></author>
   <author><firstname>Volker</firstname><surname>Ruppert</surname></author>
   <author><firstname>Christophe</firstname><surname>Bothamy</surname></author>
   <editor><firstname>Michael</firstname><surname>Calabrese</surname></editor>
   <editor><firstname>Stanislav</firstname><surname>Shwartsman</surname></editor>
   </authorgroup>
</bookinfo>

<!-- *************************************************************** -->
<chapter id="introduction"><title>Introduction to Bochs</title>
<section id="whatisbochs"><title>What is Bochs?</title>
<para>
Bochs is a program that simulates a complete Intel x86 computer.  It
can be configured to act like a <!--286,--> 386, 486, Pentium, Pentium II,
Pentium III, Pentium 4 or even like x86-64 CPU, including optional MMX, SSEx
and 3DNow! instructions.
Bochs interprets every instruction from power-up to reboot, and has
device models for all of the standard PC peripherals: keyboard, mouse,
VGA card/monitor, disks, timer chips, network card, etc.  Because Bochs
simulates the whole PC environment, the software running in the simulation
"believes" it is running on a real machine.  This approach allows Bochs
to run a wide variety of software with no modification, include most popular
x86 operating systems: Windows 95/98/NT/2000/XP and Vista, all Linux flavors,
all BSD flavors, and more.
</para>

<para>
Bochs is written in the C++ programming language, and is designed to run
on many different host platforms<footnote>
<para>
Since Bochs can run on one kind of machine and simulate another machine, we
have to be clear in our terminology to avoid confusion.  The host platform is
the machine that runs the Bochs software.  The guest platform is the operating
system and applications that Bochs is simulating.
</para>
</footnote>, including x86, PPC, Alpha, Sun, and MIPS.  No matter what the
host platform is, Bochs still simulates x86 hardware.  In other words, it
does not depend on the native instructions of the host machine at all.
This is both a strength and a weakness, and it's the major difference between
Bochs and many other x86 emulation software such as plex86, VMware, etc.
Because Bochs uses software simulation for every single x86 instruction, it
can simulate a Windows application on an Alpha or Sun workstation.  However,
the downside of Bochs' approach is simulation performance.  To model the
processor accurately, Bochs must run many instructions for every simulated x86
instruction, and this makes the simulated machine many times slower than
the physical machine.  Commercial PC emulators (VMware, Connectix, etc.) can
achieve much high emulation speed using a technique called
virtualization<footnote>
<para>
Virtualization takes advantage of simulating x86 instructions on an
x86 machine, allowing large portions of the simulation to take place
at native hardware speed.  Whenever the simulated machine talks to the
hardware or enters certain privileged modes (such as in kernel code),
the simulator typically takes control and simulates that code in
software at much slower speed, just like Bochs does.
</para>
</footnote>, but they are neither portable to non-x86 platforms nor open
source.  The <ulink url="http://savannah.nongnu.org/projects/plex86">Plex86</ulink> project is
working toward an open-source x86 simulator with virtualization.
</para>

<para>
To do anything interesting in the simulated machine, Bochs needs to interact
with the operating system on the host platform (the host OS).  When you press a
key in the Bochs display window, a key event goes into the device model for the
keyboard.  When the simulated machine needs to read from the simulated hard
disk, Bochs reads from a disk image file on the host machine.  When the
simulated machine sends a network packet to the local network, Bochs uses the
host platform's network card to send the packet out into the real world.  These
interactions between Bochs and the host operating system can be complicated,
and in some cases they are host platform specific.  Sending a network packet in
FreeBSD requires different code than sending the packet in Windows XP, for
example.  For this reason, certain features are supported on some host
platforms and not others. On GNU/Linux, Bochs can simulate a network card that
communicates with the world, but on MacOSX the simulated network card may not
work because the communication code between the device model and the MacOSX
operating system has not been written.
</para>

<para>
<!-- really more like Background or Bochs History, but maybe it doesn't need its own section unless it gets to 3 paras or so  -->

Bochs was written by Kevin Lawton starting in 1994.  It began as a
commercial product, which you could buy with source code for ...
&NEEDHELP; <footnote>
<para>
We need a Bochs historian to help out here.  For background, it would be
interesting to know how much Bochs used to cost and what it was used for.  I
thought I saw an interview out there somewhere where Kevin says why he started
it and some more background information.
</para>
</footnote> Finally, in March 2000, MandrakeSoft (now called
<ulink url="http://www.mandriva.com/">Mandriva</ulink>) bought Bochs
and made it open source under the GNU LGPL.

<!--
we should make it clear that Kevin is not the primary maintainer of Bochs,
but I want to get some more background.  Did he get hired by Mandrakesoft
to do plex86 at the same time as Bochs was bought?  In his linux.com interview
Kevin said: "The only way I can move Bochs to open source is if someone
sponsors that happening. That would be ideal, and would enable me to focus more
on Bochs and FreeMWare, rather than be sidetracked with related consulting
jobs."

The last version of Bochs that he released was 3/25/2000, three days after the
Mandrake press release.
-->
In March 2001, Kevin helped a few developers to move all Bochs activities from
bochs.com to a new site at bochs.sourceforge.net.  Since then the Bochs project
has settled into its new home, and around release times has even hit #1 most
active project of the week at SourceForge.
</para>
</section><!-- end: What is Bochs? -->

<section id="who-uses-bochs"><title>Who uses Bochs?</title>
<para> It is hard to estimate how many people have tried Bochs or use it on a
regular basis, but a few statistics give an indication.  The <link
linkend="bochs-developers">bochs-developers mailing list</link>, which is the
primary source of news on bugs and releases, has over 400 subscribers.  The
latest version has been downloaded over 150,000 times from SourceForge, not
counting any mirror website or SVN users.
</para>

<para>
Bochs has many possible uses, and different people use it for different
things.  Many people use it to run applications in a second operating system
without needing two different computers or dual-booting.  Running
Windows software on a non-x86 workstation or on an x86 Unix box are common
uses.  Also, because every hardware instruction and every line of simulator
code is accessible, Bochs is used extensively for debugging new operating
systems.  If you were writing boot code for your home-brewed
x86 operating system and it didn't work right, booting it in Bochs could
give you great visibility into what is really going on.  The Bochs
debugger lets you simulate quickly or slowly, pausing whenever you want
to look at the contents of memory or the CPU registers.  Or, if you
wanted to study which parts of a program take the most time, you could use
Bochs to measure how often certain pieces of the code were executed.
</para>

<para>
Bochs has been used as a teaching tool in Operating Systems classes, in which
students used and modified it to learn how the PC hardware works.  As a final
project the students had to add a new peripheral device, so they had to learn
all about I/O ports, interrupts, and device drivers.  In industry, it is used
to support legacy applications on modern hardware, and as a reference model
when testing new x86-compatible hardware.
</para>

<para>
There may be as many uses of Bochs as there are users.  Do you want to run
your old DOS games?  Or learn how to program under GNU/Linux, without leaving your
Windows desktop?  Or reverse engineer your printer driver?  You decide.
</para>

</section>  <!-- end of Introduction:Who uses Bochs? section -->


<section id="is-bochs-right-for-me"><title>Is Bochs right for me?</title>
<para>
Bochs is very useful for some applications, and not well suited to others.
This section tries to answer the question, "Is Bochs right for me?"
</para>

<para>Bochs may or may not be right for you, depending on what it is you want to do.
Perhaps all you want to do is run one or two applications native to Microsoft Windows
on GNU/Linux, or vice-versa.  Perhaps your biggest concern is speed and performance.
Maybe you don't mind tweaking a few files here and there when you want another application
to work in that setting.
In cases where the objective is to simulate x86 hardware on an x86, Plex86, Wine, and
VMware might be your best options.</para>

<para>
On the other hand, perhaps you have a vital application running on an older operating
system that only runs well on old hardware.  You are concerned that the life cycle of
this hardware is coming to an end, and your backup and restoration hardware and tools
no longer suffice for the amount of data that you have.  You need to transfer backup
disk images over a network, and want to use modern procedures for hardware maintenance.
Perhaps the application is important enough to run on a larger computer, such as a
64-bit machine, or even a mainframe.  Bochs would be an excellent option in such a scenario.
</para>

<para>
Perhaps your objective is to debug software or hardware drivers.  Bochs offers a controlled
environment that can better assist you in determining cause and effect relationships.
You can take snapshots that show you what is going on behind the scenes.
You can isolate the line that caused that crash.  You can have multiple
images and compare them under a microscope.
In these situation, Bochs could save you time and resources.
</para>

<para>
Information Technology changes faster than any other field.
It is very easy to forget transitional software that came and went.
But history is important to all fields, and to build on the future,
it is important to understand the past.  Computer programmers, however,
do not have the same advantage as an architect, who can, for example,
take a trip to Greece and touch a pillar.  Much of the history of Computer
Science is left on corroding floppies and malfunctioning hardware.
Bochs gives you the benefit of having one or more complete environments
where you can understand firsthand the behavior of operating systems and
programs.  This cannot be achieved with an "emulator" such as Wine.
</para>

</section>  <!-- end of Introduction:Is Bochs right for me? section -->

<section id="will-it-work-for-me"><title>Will it work for me?</title>

<para>
Whether Bochs works for you depends on your host hardware, host operating
system, guest operating system, guest software, and your ability to work in
a command-line environment using documentation.  There is no wizard to help
you through the setup process.  You do not get a recovery or installation
disk to assist you in the process of installing a guest operating system.
Bochs only provides you with the "virtual hardware", and it is up to you to do the rest.
</para>

<para>Bochs will run on Windows, GNU/Linux, FreeBSD, OpenBSD, or MacOSX.
If you are running on x86 hardware, you have a range of choices.
Check the installation section for your host platform to see what options
Bochs supports on your platform.  If the most important factor is speed,
you may want to try a virtualization product instead of Bochs (VMware, VirtualBox, plex86).
</para>

<para>
If you are using a non-x86 machine, then Bochs is one of the few choices for
running x86 software.  Bochs has been known to work on Solaris (Sparc),
GNU/Linux (PowerPC/Alpha), MacOS (PowerPC), IRIX (MIPS), Digital Unix (Alpha),
and AIX (PowerPC).
</para>

<para>
You can also find more detailed testing information on the testing
status page on the &bochswebsite;.
<!-- DISABLED: testing status page has been removed because it was so out of
date...  The testing status page tells which combinations of host platform and
guest platform have been tried by other Bochs users. -->
</para>

</section>  <!-- end of Introduction:Will it work for me? section -->

<section id="license"><title>Bochs License</title>
<para>
Bochs is copyrighted by MandrakeSoft S.A.<footnote>
<para>
Mandriva has a web site at
<ulink url="http://mandriva.com">http://mandriva.com</ulink>
</para>
</footnote>
and distributed under the
GNU Lesser General Public License<footnote>
<para>
Complete text of the GNU LGPL is included with the source code in a file
called COPYING, and is also <ulink url="http://www.gnu.org/licenses/lgpl.html">here</ulink>.
</para>
</footnote>.  The following text appears at the
top of every source code file in the Bochs distribution:
<programlisting>
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
</programlisting>

</para>

</section>  <!-- end of Introduction: Bochs License section -->

<section id="thirdparty"><title>Third Party Software Licensing and Temporary Files</title>

<para>
Before you install or use any Operating System, BIOS, or other software package
within the Bochs PC emulation environment, make sure you are and will be in
compliance with all the software licenses pertaining to the software you wish
to install.  It is completely your responsibility to provide licenses and records
on all software that you install and/or use.  It is also completely your responsibility to
maintain total compliance with all Software Licenses involved.
</para>

<para>
In the process of installing Software within the Bochs PC emulation environment,
it may be helpful or necessary to copy or convert files from the original distribution
format to a second format to facilitate the installation.  You should delete
the intermediate files after installation, making certain that only the
original distribution files remain.
</para>


</section>  <!-- end of Introduction:Third Party Software Licensing -->

<section id="features"><title>Features</title>
<para>
The following table shows the features of Bochs and which platforms they
currently work with.
</para>
<table><title>Bochs Features</title>
<tgroup cols="3" align="left" colsep="1" rowsep="1">
<thead>
  <row>
    <entry>Feature</entry>
    <entry>Supported?</entry>
    <entry>Description</entry>
  </row>
</thead>
<tbody>
  <row>
    <entry>configure script</entry>
    <entry>Yes</entry>
    <entry>Bochs uses GNU autoconf to configure Makefiles and headers.
    Autoconf helps Bochs to compile on a wide variety of platforms.
    </entry>
  </row>
  <row>
    <entry>386,486,Pentium Emulation</entry>
    <entry>Yes</entry>
    <entry>Bochs can be configured to emulate one of several families of Intel hardware. Some Pentium features are incomplete, such as SMM (System Management Mode).</entry>
  </row>
  <row>
    <entry>P6 and later CPU Emulation</entry>
    <entry>Yes</entry>
    <entry>Bochs can be configured to emulate any P6 family processor including optional MMX and SSE instructions.
    </entry>
  </row>
  <row>
    <entry>Pentium 4 Emulation</entry>
    <entry>Incomplete</entry>
    <entry>A few Pentium 4 features are incomplete, such as an on-chip APIC extensions (XAPIC) for SMP simulation.
    </entry>
  </row>
  <row>
    <entry>x86-64 Extensions Emulation</entry>
    <entry>Yes</entry>
    <entry>Bochs can be configured to emulate x86-64 with many recent Intel or AMD extensions.</entry>
  </row>
  <row>
    <entry>Command Line Debugger</entry>
    <entry>Yes</entry>
    <entry>Powerful command line debugger (optional) that lets you stop
    execution and examine registers and memory, set breakpoints, etc.
    </entry>
  </row>
  <row>
    <entry>GUI Debugger</entry>
    <entry>Yes</entry>
    <entry>Chourdakis Michael and Bruce Ewing contributed very powerful GUI frontend for Bochs internal debugger.
    GUI debugger frontend is supported for Win32 and GTK hosts.
    </entry>
  </row>
  <row>
    <entry>Floating Point</entry>
    <entry>Yes</entry>
    <entry>Uses software floating point engine based on <ulink url="http://www.jhauser.us/arithmetic/SoftFloat.html">SoftFloat floating point emulation library</ulink>.
    </entry>
  </row>
  <row>
    <entry>Enhanced BIOS</entry>
    <entry>Yes</entry>
    <entry>Implements ElTorito, EDD v3.0, basic APM feature, PCIBIOS features
    and the PCI interrupt routing table. The latest version of the Bochs BIOS
    has a 32-bit init for ACPI, SMM and SMP.
    </entry>
  </row>
  <row>
    <entry>VGA</entry>
    <entry>Yes</entry>
    <entry>VGA color graphics emulation in a window.
    </entry>
  </row>
  <row>
    <entry>VBE (VESA) Support</entry>
    <entry>Yes</entry>
    <entry>Currently resolutions up to 2560x1600x32bpp are supported.
    You must enable VBE with the VGA extension option and use the LGPL'd VGABIOS.
    For more information see <xref linkend="vesa-notes">.
    </entry>
  </row>
  <row>
    <entry>Cirrus Logic video card</entry>
    <entry>Yes</entry>
    <entry>Cirrus Logic CL-GD5430 ISA or CL-GD5446 PCI video card support.
      For more information see <xref linkend="cirrus-notes">.</entry>
  </row>
  <row>
    <entry>Floppy disk</entry>
    <entry>Yes</entry>
    <entry>Supports floppy disk images on all platforms: 2.88M 3.5", 1.44M 3.5", 1.2M 5.25",
    720K 3.5" and 360K 5.25". On Unix and Windows 9x/NT/2000/XP, Bochs can access the
    physical floppy drive. It is also possible to use a local directory as VFAT media
    (1.44M only).
    </entry>
  </row>
  <row>
    <entry>Multiple ATA channels</entry>
    <entry>Yes</entry>
    <entry>Emulates up to 4 ATA channels. Up to 8 ATA/ATAPI emulated devices can be attached,
    two per ATA channel.
    So you can have eight hard disks or seven hard disks and a CD-ROM or four hard
    disks and four CD-ROMs, or one hard disk and seven CD-ROMs, etc...
    </entry>
  </row>
  <row>
    <entry>Hard disk</entry>
    <entry>Yes</entry>
    <entry>Emulates ATA-6/IDE hard drives via image files.  Physical
    hard disk access is supported on some architecture, but NOT recommended, primarily for safety reasons.
    Hard disks up to 127GB are supported, on any platform that support large files access.
    It is also possible to use a local directory as VFAT drive.
    </entry>
  </row>
  <row>
    <entry>CD-ROM</entry>
    <entry>Yes</entry>
    <entry>Emulates ATAPI-4/IDE CD-ROM.  The CD-ROMs can read from an ISO disk image
    on any platform. On Windows (9x/ME/NT/2000/XP), Linux, SunOS, FreeBSD,
    NetBSD, OpenBSD, Amiga/MorphOS and MacOSX, Bochs can read from the
    physical CD-ROM drive. Starting with version 1.4, Bochs is even able to boot from
    a bootable CD or bootable ISO image.
    </entry>
  </row>
  <row>
    <entry>Keyboard</entry>
    <entry>Yes</entry>
    <entry>Emulates a PS/2 keyboard with North American key mappings. Optional keyboard layout
    remapping files are provided to support localized keyboard in X11 (Belgian, Danish, French,
    German, Italian, Russian, Slovenian, Spanish, Swedish, U.K.).
    </entry>
  </row>
  <row>
    <entry>Mouse</entry>
    <entry>Yes</entry>
    <entry>Emulates a serial, PS/2 or USB mouse with 3 buttons + optional mouse
    wheel support.
    </entry>
  </row>
  <row>
    <entry>Sound Blaster</entry>
    <entry>Yes</entry>
    <entry>Emulates a Sound Blaster 16 card (ISA, no plug&amp;play). On Windows, Linux, FreeBSD, MacOS 9 and
    MacOSX, the output can be sent to the host computer's sound system, see
    <xref linkend="sb16-emulation"> for details.
    </entry>
  </row>
  <row>
    <entry>Network card</entry>
    <entry>Yes</entry>
    <entry>Emulates an NE2000 compatible network card.  On Windows NT/2000,
    Linux, FreeBSD, and NetBSD, Bochs will forward packets to and from the
    operating system so that the guest OS can talk on the physical network.
    Unfortunately, on some platforms the guest OS can talk to any machine on
    the network BUT NOT the host machine.  On Windows and on systems that
    allow the TAP or TUN/TAP interface, there is no such limitation.  Often
    the host machine may be configured so the guest OS has access to the
    internet. On MacOSX, you may download the TUN driver from:
    <ulink url="http://chrisp.de/en/projects/tunnel.html"></ulink>
    </entry>
  </row>
  <row>
    <entry>Parallel Port</entry>
    <entry>Yes</entry>
    <entry>Parallel port emulation was added by Volker Ruppert for Bochs 1.3.
    Data that is sent to the parallel port by the guest OS can be saved into a
    file or sent directly into the parallel port device (Unix only).
    </entry>
  </row>
  <row>
    <entry>Serial Port</entry>
    <entry>Yes</entry>
    <entry>The serial port (16550A UART emulation) is usable, on GNU/Linux,
    NetBSD, OpenBSD, FreeBSD and MacOSX as host and guest. On other OSes the
    emulation is present, but the connection to hard- or software of the host is
    not implemented yet. Up to 4 ports are available.
    </entry>
  </row>
  <row>
    <entry>Gameport</entry>
    <entry>Yes</entry>
    <entry>Emulates a standard PC gameport. The connection to a real joystick is
    currently supported on Linux and win32 only.
    </entry>
  </row>
  <row>
    <entry>PCI</entry>
    <entry>Yes</entry>
    <entry>Emulates most of the i440FX PCI chipset. The Host-to-PCI bridge
    (PMC/DBX), the PCI-to-ISA bridge and the PCI IDE controller (PIIX3) are
    available. For PCI cards there are 5 PCI slots supported.
    </entry>
  </row>
  <row>
    <entry>USB</entry>
    <entry>incomplete</entry>
    <entry>Two types of host controllers (UHCI and OHCI) and the devices 'mouse',
    'tablet', 'keypad', 'disk', 'cdrom', 'hub' and 'printer'. are available.
    Plugging in and removing devices at runtime is possible. Access to real
    hardware is not implemented yet.
    </entry>
  </row>
  <row>
    <entry>Plugins</entry>
    <entry>Yes</entry>
    <entry>Compiling gui and devices as plugins is supported on Linux, MacOS X,
    Solaris, Cygwin and MinGW/MSYS.</entry>
  </row>
  <row>
    <entry>PIC</entry>
    <entry>Yes</entry>
    <entry>Master and slave programmable interrupt controller.
    </entry>
  </row>
  <row>
    <entry>CMOS functions</entry>
    <entry>Yes</entry>
    <entry>Real time clock (RTC) and CMOS RAM are available</entry>
  </row>
  <row>
    <entry>Dynamic Translation/Virtualization</entry>
    <entry>No</entry>
    <entry>Because Bochs is designed to be portable, it does not attempt
    to do any dynamic code translation or virtualization. See
    <xref linkend="whatisbochs"> for details.
    </entry>
  </row>
  <row>
    <entry>Simulate a Multiprocessor</entry>
    <entry>Yes</entry>
    <entry>Bochs can be configured to simulate up to 8 processors.  This
    feature is still experimental, but it can boot several Linux or Windows guests
    with SMP support.  Please note that this does NOT mean that Bochs can run
    faster on a physical SMP machine.
    </entry>
  </row>
  <row>
    <entry>Take advantage of your SMP box</entry>
    <entry>No</entry>
    <entry>At present, Bochs does not use threads or parallel processing, so it
    will not run any faster on multiprocessor hardware.
    </entry>
  </row>
  <row>
    <entry>Copy and Paste</entry>
    <entry>Yes</entry>
    <entry>Depending on the host platform, the text-mode screen text can be
    exported to the clipboard. Text in the clipboard can also be pasted, through
    Bochs, to the guest OS, as simulated keystrokes.
    </entry>
  </row>
</tbody>
</tgroup>
</table>
</section><!-- End of Features -->

<section id="supported-platforms"><title>Supported Platforms</title>
<para>
The following table shows the supported platforms with a small description and
the available display libraries on these platforms. The display library is the
code that displays the Bochs VGA screen and handles keyboard and mouse events.
</para>
<table><title>Supported platforms</title>
  <tgroup cols="3" align="left" colsep="1" rowsep="1">
  <thead>
    <row>
      <entry>Platform</entry>
      <entry>Description</entry>
      <entry>Display Libraries</entry>
    </row>
  </thead>
  <tbody>

    <row>
      <entry>Unix/X11</entry>
      <entry>
        X windows has always been well supported because it was
        Kevin Lawton's main development platform. Bryce Denney maintains
        the Unix/X11 platform now. Most features and fixes (not all) are
        tried first in Unix and then ported to the others; see
        <xref linkend="compiling"> for compile instructions.
      </entry>
      <entry>x, sdl, wx, term, rfb</entry>
    </row>

    <row>
      <entry>Win32</entry>
      <entry>
        This port was done by David Ross and is now maintained by
        Don Becker. You can compile with Microsoft Visual C++,
        see <xref linkend="compiling-win32"> for compile instructions,
        or Cygwin, see <xref linkend="compile-cygwin">.
      </entry>
      <entry>win32, sdl, wx, rfb</entry>
    </row>

    <row>
      <entry>MacOS X</entry>
      <entry>
        Emmanuel Mailliard ported the Macintosh code to MacOS X with Carbon API.
        Jeremy Parsons (Br'fin) has been maintaining the MacOS X port since
        March 2002; see <xref linkend="compile-macosx"> for compile instructions.
      </entry>
      <entry>carbon, x, rfb, sdl</entry>
    </row>

    <row>
      <entry>PowerPC-Macintosh</entry>
      <entry>
        David Batterham<!-- <email>drbatter@socs.uts.edu.au</email> or <email>drbatter@yahoo.com</email> -->
        ported Bochs to the Mac. He compiled with CodeWarrior Pro R1 (CW12)
        but has not had time to maintain the Mac port since early 2000.
        If you have Mac development tools and want to contribute, contact
        the &devlist;; see <xref linkend="compile-macos9-codewarrior"> for
        compile instructions.
      </entry>
      <entry>macos</entry>
    </row>

    <row>
      <entry>Amiga/MorphOS</entry>
      <entry>
        This port is written and maintained by Nicholai Benalal, see
        <xref linkend="compile-morphos"> for compile instructions.
      </entry>
      <entry>amigaos</entry>
    </row>

    <row>
      <entry>OS/2</entry>
      <entry>
        Nick Behnken used PE2LX to translate David Ross' Win32
        port to an OS/2 program. This hasn't been updated for a long time,
        and Nick Behnken's page seems to be inactive.
        Also, Craig Ballantyne ported Bochs to OS/2, but his web page has
        disappeared and his port has not been updated since March 2000.
        If you want to bring the OS/2 port up to date, contact the &devlist;.
      </entry>
      <entry>???</entry>
    </row>

  </tbody>
  </tgroup>
</table>
</section><!-- end: Supported Platforms -->

<section id="faq"><title>FAQ</title>
<qandaset>
  <qandaentry>
     <question>
       <para>Is Bochs Open Source?</para>
     </question>
     <answer>
       <para>
       Yes! Bochs is released under the <ulink url="http://www.gnu.org/copyleft/lesser.html">GNU LGPL</ulink>,
       much thanks to MandrakeSoft (now called <ulink url="http://www.mandriva.com">Mandriva</ulink>).
       </para>
     </answer>
  </qandaentry>

  <qandaentry>
     <question>
       <para>How do you pronounce "Bochs"?</para>
     </question>
     <answer>
       <para>
       Phonetically the same as the English word "box". It's just a play on the word "box", since techies like to call their machines a "Linux box", "Windows box", ... Bochs emulates a box inside a box.
       </para>
     </answer>
  </qandaentry>

  <qandaentry>
     <question>
       <para>Who is the author of Bochs?</para>
     </question>
     <answer>
       <para>
       Kevin Lawton is the primary author of Bochs. There have been bug fixes,
       enhancements, and code contributions from some few hundred people, so
       it is not possible to list them all.  Recently, Kevin has been working
       on a PC virtualization project called <ulink
       url="http://savannah.nongnu.org/projects/plex86">plex86</ulink>. In Fall 2002, he
       made contributed some major CPU speedups and helped with integration
       and debugging of the x86-64 emulation code.
       </para>
     </answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Who maintains Bochs now?
     </para></question>
     <answer><para>
      With Kevin's help, in April 2001, the members of the bochs-developers
      mailing list set up a new official Bochs site hosted by <ulink
      url="http://sourcefourge.net">Source Forge</ulink>. The admins on this
      project are Greg Alexander, Don Becker, Christophe Bothamy, Bryce
      Denney, Volker Ruppert and Stanislav Shwartsman.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Tell me about performance when running Bochs.
     </para></question>
     <answer><para>
     Because Bochs emulates every x86 instruction and all the devices in a PC
     system, it does not reach high emulation speeds. Users who have an x86
     processor and want the highest emulation speeds may want to consider PC
     virtualization software such as plex86 or VirtualBox (free software).
     Another related project is <ulink url="http://www.nongnu.org/qemu/">QEMU</ulink>.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Does Bochs use a disk partition to install the OS?
     </para></question>
     <answer><para>
     No. It uses a disk image file, which is simply a large file, like any other file, on your platform's disk.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Why can't I use Bochs with my current WinXP installation?
     </para></question>
     <answer><para>
     Think about this. If you had two different PC's, they would require different
     hardware drivers. So you may not be able to safely move a disk drive with WinXP
     on it, from one to the other. Bochs is no different. It emulates a certain set
     of hardware devices, and requires each OS be configured for those devices.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Is there a developer's email list for Bochs?
     </para></question>
     <answer><para>
     Yes.  For instructions on joining, refer to
     <xref linkend="mailinglist">.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Is there an IRC channel for Bochs?
     </para></question>
     <answer><para>
     Yes. You will usually find Bochs developers and users on IRC at irc.freenode.net:6667, channel #bochs.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Do you know of any snapshots of Bochs running Windows?
     </para></question>
     <answer><para>
     Yes! Look for "Screen Shots" on &bochs-sf-net; or on other Bochs sites.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Does Bochs support a CD-ROM?
     </para></question>
     <answer><para>
     Yes, a CD-ROM is supported in Linux, Windows, and most BSDs. The
     CD-ROM drivers for Bochs allow the guest operating system to access the
     host operating system's CD-ROM data directly.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Does Bochs support a sound device?
     </para></question>
     <answer><para>
       Yes, there is Sound Blaster emulation support for most common operation systems,
       see <xref linkend="sb16-emulation"> for details.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     Does Bochs support a network card?
     </para></question>
     <answer><para>
     Yes.  Bochs contains a model of an NE2000 compatible network card.
     Networking is not supported on all platforms.  See
     <xref linkend="features"> for details.
     </para></answer>
  </qandaentry>

  <qandaentry>
     <question><para>
     What applications are known to run inside of Bochs?
     </para></question>
     <answer><para>
     Well, lot's of different OS's run inside of Bochs, so
   thousands.  I'm assuming you are asking about Windows programs.
   To give you a few, the following ones from the Winstone'98 tests
   worked: Access 97, CorelDRAW! 7, Excel 97, Lotus 1-2-3 97, Word 97,
   PowerPoint 97, Quattro Pro 7, WordPerfect 7.
</para>

     <para>Also, I've compiled an entire OS kernel inside Bochs before.  Not
to mention, running DOOM, though at then-pathetic speeds.
     </para></answer>
  </qandaentry>

  <qandaentry>
    <question><para>
      I am new to Bochs, how do I start?
    </para></question>
    <answer><para>
      You should read <xref linkend="setup"> first. Next, you can check <xref linkend="guests">
      if there specific instructions on how to install your (guest) OS inside of Bochs.
    </para></answer>
  </qandaentry>

<!-- ......................................................
     A blank question to fill in copy and paste to create
     a new entry (8 lines to yank)
     ......................................................
  <qandaentry>
     <question><para>
     Question is put here
     </para></question>
     <answer><para>
       Answer is put here.
     </para></answer>
  </qandaentry>
-->

</qandaset>
</section>

</chapter>  <!-- End of Introduction to Bochs -->

<!-- *************************************************************** -->
<chapter id="release-notes"><title>Release Notes</title>

<para>
The change log is stored in the Bochs source code in a file called
CHANGES.  Click <ulink url="http://bochs.svn.sourceforge.net/viewvc/bochs/trunk/bochs/CHANGES">here</ulink>
to see the latest version of the CHANGES file.
</para>
<para>
The link above is provided by Source Forge and might change one day.  If it
stops working, you can download the current source code with SVN and read
the CHANGES file there.
</para>

</chapter>




<!-- *************************************************************** -->
<chapter id="installation"><title>Installation</title>

<section id="downloading"><title>Downloading Bochs</title>

<para>
You can download Bochs from our web site at &bochs-sf-net;.  First, you
need to choose what version to get: a recent release or a development
version.  If you trying to get things working for the first time, a release
version is recommended since it has been tested the most.  The development
versions (sometimes called snapshots) may have some newer bug fixes and new
features, but have not been tested as much as the releases.
</para>

<para>
Second, you can choose to compile Bochs from source code or install a binary
(if one is available for your platform).  Binary packages will be quicker to
install, and most include a small demo of a guest operating system called DLX
Linux to get you started.  However, some features can only be enabled if you
compile Bochs yourself, for example the Bochs debugger.  For multiuser systems,
you will probably need system administrator privileges (root) to install a
binary package.  If you decide to get a binary, download it to your hard disk,
uncompress it, then go to the section called <link
linkend="install-binary">Installing a Binary</link> for more information.
</para>

<para>
If you are going to compile Bochs yourself, you need the gzipped tarball
containing the source code, called
<filename>bochs-<replaceable>version</replaceable>.tar.gz</filename>.  For
Windows and Mac, the prebuilt Makefiles are separate, so also get
the Makefiles for your platform.  To unpack a compressed TAR file<footnote>
<para>
A TAR file is a single file that contains many files packed inside.  Bochs
TAR files are compressed with a program called gzip, and another program
called gunzip is used to uncompress them.
</para>
</footnote> on a Unix machine<footnote>
<para>
On Windows, look for software called WinZip to unpack the TAR.
</para>
</footnote>
, type
<screen>
  gunzip -c bochs-<replaceable>version</replaceable>.tar.gz | tar -xvf -
</screen>
This creates a directory called
<filename>bochs-<replaceable>version</replaceable></filename> full of
files.  This directory will be referred to as &bochsdir;.  Go into
&bochsdir; and you are ready to compile.  Instructions for compiling
Bochs are in the section, <link linkend="compiling">Compiling Bochs</link>.
</para>

<para>
Alternatively, you can also obtain the sources for any Bochs version using SVN.
See the <link linkend="get-src-svn">SVN instructions</link> for details.
</para>
</section>  <!-- End of Installation:Downloading Bochs section -->

<section id="get-src-svn"><title>Tracking the source code with SVN</title>
<para>
SVN (Subversion) is a tool used by many software developers to manage changes
within their source code tree. SVN provides the means to store not only the
current version of a piece of source code, but a record of all changes (and who
made those changes) that have occurred to that source code. Use of SVN is
particularly common on projects with multiple developers, since SVN ensures
changes made by one developer are not accidentally removed when another
developer posts their changes to the source tree. The Bochs source code and
documentation are available using SVN<footnote>
<para>
You can download SVN software and documentation from
<ulink url="http://subversion.apache.org">subversion.apache.org</ulink>.
</para>
</footnote>.
</para>

<section><title>Checking out Bochs</title>
<para>
When you have SVN installed, the first step is to do a checkout. The initial
checkout command is long and ugly, but usually you only have to do it
once. The example below shows the SVN checkout process of the Bochs trunk in Unix.
On the Windows platform, you can download a SVN client from
<ulink url="http://subversion.apache.org/packages.html#windows">subversion.apache.org</ulink>,
or use SVN within Cygwin<footnote>
<para>
Cygwin is an open source Unix-like environment for Windows platforms,
available at <ulink url="http://www.cygwin.com">www.cygwin.com</ulink>.
</para>
</footnote>.

<figure><title>Checking out Bochs in SVN</title>
<screen>
  user$ <command>svn co https://bochs.svn.sourceforge.net/svnroot/bochs/trunk/bochs bochs</command>
  A    bochs/ltdl.c
  A    bochs/Makefile.in
  A    bochs/bochs.h
  .
  .   <lineannotation>(This might take a few minutes, depending on your network connection.)</lineannotation>
  .
  A    bochs/install.sh
   U   bochs
  Checkout, Revision 10754.
  user$ <command>cd bochs</command>
  user$ <command>ls</command>
  aclocal.m4       cpu                 logio.cc        pc_system.cc
  bios             cpudb.h             ltdl.c          pc_system.h
  bochs.h          crc.cc              ltdlconf.h.in   plugin.cc
  build            disasm              ltdl.h          plugin.h
  bx_debug         doc                 ltmain.sh       README
  bxversion.h.in   docs-html           main.cc         README-plugins
  bxversion.rc.in  extplugin.h         Makefile.in     README.rfb
  CHANGES          fpu                 memory          README-wxWindows
  config.cc        gdbstub.cc          misc            TESTFORM.txt
  config.guess     gui                 msrs.def        TODO
  config.h.in      host                osdep.cc        win32_enh_dbg.rc
  config.sub       install-sh          osdep.h         win32res.rc
  configure        instrument          param_names.h   wxbochs.rc
  configure.in     iodev               PARAM_TREE.txt
  COPYING          load32bitOShack.cc  patches
  user$ _
</screen>
</figure>
</para>

<note><para>
  This is just an example output of a checkout of specific version of the Bochs
  trunk and folder. Depending on the checkout command and revision, you most
  likely will see more/other files.
</para></note>

<tip>
<para>
If you have write access to the Bochs SVN tree, see the Developers Guide
<footnote>
<para>
See the <ulink url="../development/resources.html">Developers Guide</ulink>
and/or look at
<ulink url="http://sourceforge.net/apps/trac/sourceforge/wiki/Subversion#Access">SourceForge's Subversion documentation</ulink>,
for instructions.
</para>
</footnote> for details.
</para>
</tip>

<para>
The SVN checkout process (above) gives you a directory called bochs that
contains the very latest source code.  I will refer to this directory
as &bochsdir;.  In each subdirectory directory there's also a
directory called ".svn" which tells the SVN software where the code was checked
out, what version you have, and where to go for future updates.
</para>
</section>

<section><title>Getting the Latest Version</title>
<para>
Most developers use SVN to always give them the latest source code.  The minute
that any developer checks in a change, they are available to everyone else
through SVN. You just have to type <command>svn update</command> in the
&bochsdir; directory, and SVN will retrieve any files and directories that have
been changed since you did a checkout.  If you update regularly, each update
takes a short time because it downloads only the files that changed.
See also <link linkend="svn-release-version">Getting a release version</link>.
</para>

<para>
The <command>svn update</command> command tells you if any new files have
been downloaded from the server, and it also tells you if you have modified any
of the SVN-controlled files.  As it checks through the source directories, it
will list files that have changed, with a single letter before the name that
tells the status of that file.  The most common status letters are listed
below.

<table frame="all">
<title>Status letters in a SVN update</title>
  <tgroup cols="3">
    <thead>
      <row>
        <entry>Letter</entry>
        <entry>Meaning</entry>
        <entry>Description</entry>
      </row>
    </thead>
    <tbody>
      <row>
        <entry>?</entry>
        <entry>unknown</entry>
        <entry>
        This file is in your bochs directory, but SVN does not know anything
        about it.  For example, when you compile Bochs, any files created
        during the build process appear as ?.
        </entry>
      </row>
      <row>
        <entry>U</entry>
        <entry>update</entry>
        <entry>
        SVN downloaded a new version of this file because it changed on the
        server, usually because someone else did a checkin.
        </entry>
      </row>
      <row>
        <entry>A</entry>
        <entry>added</entry>
        <entry>
        SVN downloaded a newly added file from the server.
        </entry>
      </row>
      <row>
        <entry>D</entry>
        <entry>deleted</entry>
        <entry>
        This file has been deleted on the server and SVN removed it from your
        local copy.
        </entry>
      </row>
      <row>
        <entry>C</entry>
        <entry>conflict</entry>
        <entry>
        You have changed this file on your disk, but this change conflicts with
        a change that was checked in.  Conflicts occur when two people change
        the same line of code in different ways.  You need to edit the
        conflicting file(s) and clean it up by hand.  Or, sometimes it's
        easiest to discard your own edits and download a fresh copy, by
        deleting the conflicting file and running svn update again.
        </entry>
      </row>
    </tbody>
   </tgroup>
</table>
</para>

</section>

<section id="svn-release-version"><title>Getting a Release Version</title>
<para>
You can also use the SVN checkout command to get the Bochs source code for
any release since March 2000.  The command is
<screen>
  user$ <command>svn co https://bochs.svn.sourceforge.net/svnroot/bochs/tags/<replaceable>tagname</replaceable> bochs</command>
</screen>
The tag tells which release you want, and it can be one of the following:

<table frame="all">
<title>Bochs Release Tags</title>
  <tgroup cols="2">
    <thead>
      <row>
        <entry>Bochs version</entry>
        <entry>Release tag for SVN</entry>
      </row>
    </thead>
    <tbody>
      <row>
        <entry>2.4.6</entry>
        <entry>REL_2_4_6_FINAL</entry>
      </row>
      <row>
        <entry>2.4.5</entry>
        <entry>REL_2_4_5_FINAL</entry>
      </row>
      <row>
        <entry>2.4.2</entry>
        <entry>REL_2_4_2_FINAL</entry>
      </row>
      <row>
        <entry>2.4.1</entry>
        <entry>REL_2_4_1_FINAL</entry>
      </row>
      <row>
        <entry>2.4</entry>
        <entry>REL_2_4_FINAL</entry>
      </row>
      <row>
        <entry>2.3.7</entry>
        <entry>REL_2_3_7_FINAL</entry>
      </row>
      <row>
        <entry>2.3.6</entry>
        <entry>REL_2_3_6_FINAL</entry>
      </row>
      <row>
        <entry>2.3.5</entry>
        <entry>REL_2_3_5_FINAL</entry>
      </row>
      <row>
        <entry>2.3</entry>
        <entry>REL_2_3_FINAL</entry>
      </row>
      <row>
        <entry>2.2.6 (intermediate2)</entry>
        <entry>REL_2_2_6_FINAL</entry>
      </row>
      <row>
        <entry>2.2.5 (intermediate1)</entry>
        <entry>REL_2_2_5_FINAL</entry>
      </row>
      <row>
        <entry>2.2.1 (bugfix1)</entry>
        <entry>REL_2_2_1_FINAL</entry>
      </row>
      <row>
        <entry>2.2</entry>
        <entry>REL_2_2_FINAL</entry>
      </row>
      <row>
        <entry>2.1.1 (bugfix1)</entry>
        <entry>REL_2_1_1_FINAL</entry>
      </row>
      <row>
        <entry>2.1</entry>
        <entry>REL_2_1_FINAL</entry>
      </row>
      <row>
        <entry>2.0.2 (bugfix2)</entry>
        <entry>REL_2_0_2_FINAL</entry>
      </row>
      <row>
        <entry>2.0.1 (bugfix1)</entry>
        <entry>REL_2_0_1_FINAL</entry>
      </row>
      <row>
        <entry>2.0</entry>
        <entry>REL_2_0_FINAL</entry>
      </row>
      <row>
        <entry>1.4.1 (bugfix1)</entry>
        <entry>REL_1_4_1_FINAL</entry>
      </row>
      <row>
        <entry>1.4</entry>
        <entry>REL_1_4_FINAL</entry>
      </row>
      <row>
        <entry>1.3</entry>
        <entry>REL_1_3_FINAL</entry>
      </row>
      <row>
        <entry>1.2.1 (bugfix1)</entry>
        <entry>REL_1_2_1_FINAL</entry>
      </row>
      <row>
        <entry>1.2</entry>
        <entry>REL_1_2_FINAL</entry>
      </row>
      <row>
        <entry>1.1.2 (bugfix3)</entry>
        <entry>REL_1_1_2_BASE</entry>
      </row>
      <row>
        <entry>1.1.1 (bugfix2)</entry>
        <entry>REL_1_1_1_BASE</entry>
      </row>
      <row>
        <entry>1.1 (bugfix1)</entry>
        <entry>REL_1_1_BASE</entry>
      </row>
    </tbody>
   </tgroup>
</table>

</para>

</section>

<section><title>More about SVN</title>
<para>
Entire books have been written on SVN, so there's no sense in duplicating
it all here in the Bochs documentation.  Some sources of additional
information are listed below.
</para>
<itemizedlist>
<listitem><para>The <ulink url="http://subversion.apache.org">subversion.apache.org
site</ulink> has tons of SVN FAQs and documentation.</para></listitem>
<listitem><para>
A German <ulink url="http://pvs.uni-muenster.de/pvs/lehre/WS06/projekt/svn-faq.html">SVN FAQ</ulink>
is available at University of Muenster.
</para></listitem>
</itemizedlist>

</section>


</section> <!-- End of Installation:Getting the source code with SVN -->


<section id="install-binary"><title>Installing a Binary</title>

<para>
This section is divided up by platform, since installing a binary package
is different on different platforms.
</para>

<section><title>Windows</title>
<para>
The Bochs binaries for Windows are distributed in an EXE installer package.
The Bochs installer can be started like any other Windows program and it brings
up the installation wizard. Here you can select the destination folder and the
installation options. The wizard installs the files and creates the registry
keys, start menu and desktop links.
</para>
<para>
Previous releases of Bochs were distributed as ZIP packages, too. These packages
contained the same set of files as the installer package from the same version.
</para>
<para>
If you are new to Bochs you should try out the DLX Linux demo distributed with
Bochs. The installation wizard has created a link on the desktop if you decided
to install the demo. If you doubleclick the icon two windows will appear:
one is the Bochs Display window, and the other is text window that is used for
the runtime configuration and for log messages if no logfile is specified.
</para>
<para>
You can find more information on the DLX Linux demo in the next section below the
DLX Linux screenshot.
</para>

<table><title>Files in Bochs directory (Windows version)</title>
<tgroup cols="2" align="left" colsep="1" rowsep="1">
<thead> <row> <entry>File</entry> <entry>Description</entry> </row>
</thead>
<tbody>

<row><entry>BIOS-bochs-latest </entry> <entry> default ROM BIOS image for Bochs </entry> </row>
<row><entry>BIOS-bochs-legacy </entry> <entry> ROM BIOS image without 32-bit init code </entry> </row>
<row><entry>bochs.exe </entry> <entry> the main Bochs executable </entry> </row>
<row><entry>bochs.ico </entry> <entry> the Bochs icon (used for links in start menu and on the desktop) </entry> </row>
<row><entry>bochsdbg.exe </entry> <entry> the main Bochs executable with debugger enabled </entry> </row>
<row><entry>bochsrc-sample.txt </entry> <entry> sample Bochs configuration file </entry> </row>
<row><entry>bxcommit.exe </entry> <entry> tool for committing redologs to flat disk images </entry> </row>
<row><entry>bximage.exe </entry> <entry> tool for making new disk images </entry> </row>
<row><entry>CHANGES.txt </entry> <entry> what has changed between versions </entry> </row>
<row><entry>COPYING.txt </entry> <entry> copy of the LGPL license </entry> </row>
<row><entry>README.txt </entry> <entry> the read-me file from the source distribution. </entry> </row>
<row><entry>TODO.txt </entry> <entry> the TODO file from the source distribution. </entry> </row>
<row><entry>niclist.exe </entry> <entry> tool to find out the network interface name </entry> </row>
<row><entry>penguin.ico </entry> <entry> the Linux logo (used for the DLX link in start menu) </entry> </row>
<row><entry>sb16ctrl.exe </entry> <entry> tool to control sb16 in Bochs </entry> </row>
<row><entry>sb16ctrl.txt </entry> <entry> examples of sb16ctrl commands </entry> </row>
<row><entry>VGABIOS-elpin-2.40 </entry> <entry> VGA BIOS image for Bochs </entry> </row>
<row><entry>VGABIOS-elpin-LICENSE.txt </entry> <entry> license for VGA BIOS </entry> </row>
<row><entry>VGABIOS-lgpl-latest </entry> <entry> LGPL'd VGA BIOS image for Bochs </entry> </row>
<row><entry>VGABIOS-lgpl-latest-debug </entry> <entry> LGPL'd VGA BIOS image for Bochs with debug output to the logfile </entry> </row>
<row><entry>VGABIOS-lgpl-latest-cirrus </entry> <entry> LGPL'd VGA BIOS image for Bochs with the Cirrus extension enabled </entry> </row>
<row><entry>VGABIOS-lgpl-latest-cirrus-debug </entry> <entry> LGPL'd VGA BIOS image for Bochs with the Cirrus extension enabled and debug output to the logfile </entry> </row>
<row><entry>VGABIOS-lgpl-README.txt </entry> <entry> readme for the LGPL'd VGA BIOS </entry> </row>
<row><entry>uninstall.exe </entry> <entry> uninstall program for Bochs (created by the installation wizard) </entry> </row>
<row><entry>dlxlinux\ </entry> <entry> directory containing DLX linux sample disk image and configuration files</entry> </row>
<row><entry>dlxlinux\readme.txt </entry> <entry> description of DLX linux</entry> </row>
<row><entry>dlxlinux\bochsrc.txt </entry> <entry> Bochs configuration file for DLX</entry> </row>
<row><entry>dlxlinux/hd10meg.img </entry> <entry> disk image file (10 meg) </entry> </row>
<row><entry>dlxlinux\start.bat </entry> <entry> Run this BAT file to try out DLX Linux inside Bochs! </entry> </row>
<row><entry>dlxlinux\testform.txt </entry> <entry> Form for reporting success or failure </entry> </row>
<row>
  <entry>doc\index.html</entry>
  <entry>a local copy of all Bochs documentation (<ulink url="http://bochs.sourceforge.net/doc/docbook/index.html">online copy</ulink>)</entry>
</row>
<row><entry>keymaps\*.map </entry> <entry>keymap tables (on Windows used for the paste feature only) </entry> </row>
</tbody>
</tgroup>
</table>

</section> <!-- end of Installing a Binary:Windows -->

<section id="linuxrpm">
<title>Linux RPM</title>
<para>
RPM stands for "RedHat Package Manager."  An RPM is a compressed file
containing files to be installed on your system.  Many Linux distributions,
not just RedHat ones, can install files from an RPM.  First, download the
Bochs RPM for your architecture to your computer.  For example, if you have an
Intel-compatible computer, be sure to get the RPM that says "for Linux x86
distributions" or "i386".  Once you have the package on your local disk, you
should become the root user and install it as follows<footnote>
<para>
Many distributions have their own RPM installer program, often graphical, and
they should work ok.  It is helpful to be able to see the text output from
RPM, so if you use a fancy RPM installer, be sure to find the text output and
check that it looks correct.
</para>
</footnote>:

<figure><title>Installing an RPM in Linux</title>
<screen>
  user$ <command>su</command>
  Password:
  root# <command>ls -l bochs-1.2.1.i386.rpm</command>
  -rw-rw-r--    1 user     user      1877515 Sep 14 09:02 bochs-1.2.1.i386.rpm
  root# <command>rpm -i bochs-1.2.1.i386.rpm</command>
  Looking for fonts to install... /usr/local/bochs/latest/
  Looking for X11 Font Path... /usr/lib/X11/fonts
  Installing vga.pcf... ok    (it was already there)
  Running mkfontdir...
  Done installing Bochs fonts for X11.
  root# exit
  user$ _
</screen>
</figure>
</para>

<para>
All RPM installations are done as the root user because they require
permission to update system files and directories.  If you do not have root
access you need to compile Bochs in your home directory.
</para>

<para>
RPM installation can fail for a few reasons.  It will fail if you already
have a Bochs package installed.  In this case, try upgrading the old package
to the new package with <command>rpm --upgrade NAME.i386.rpm</command>.
Another potential problem is missing RPM dependencies.  If you are getting
errors about missing files or RPMs, then first you should try to
install the RPMs that provide the missing pieces.  If that cannot be done,
download the source RPM and build a new binary RPM that is appropriate
for your platform.  The command is <command>rpmbuild --rebuild
NAME.src.rpm</command>.  As a last resort, you can run rpm with the
<command>--nodeps</command> option to ignore dependencies and install it
anyway, but if it is missing important pieces it may not run properly.
</para>

<para>
The Bochs RPM installs four new commands and associated manual pages: bochs,
bochs-dlx, bximage and bxcommit.  First, let's try out the DLX Linux demo by typing
<command>bochs-dlx</command>.

<screen>
  user$ bochs-dlx
  ---------------------------------------------------------------
	      DLX Linux Demo, for Bochs x86 Emulator
  ---------------------------------------------------------------
  Checking for bochs binary...ok
  Checking for DLX linux directory...ok
  Checking for /bin/gzip...ok
  Checking for /usr/users/bryce/.bochsdlx directory...
  ---------------------------------------------------------------
  To run the DLX Linux demo, I need to create a directory called
  /usr/users/bryce/.bochsdlx, and copy some configuration files
  and a 10 megabyte disk image into the directory.
  ---------------------------------------------------------------
  Is that okay? [y/n]
  y
  Copying /usr/share/bochs/dlxlinux/bochsrc.txt -> /usr/users/bryce/.bochsdlx/.
  Copying /usr/share/bochs/dlxlinux/README -> /usr/users/bryce/.bochsdlx/.
  Copying /usr/share/bochs/dlxlinux/testform.txt -> /usr/users/bryce/.bochsdlx/.
  Uncompressing /usr/share/bochs/dlxlinux/hd10meg.img.gz -> /usr/users/bryce/.bochsdlx/hd10meg.img
  Entering /usr/users/bryce/.bochsdlx
  Running bochs
  ========================================================================
			Bochs x86 Emulator 2.4.6.svn
		Build from SVN snapshot, after release 2.4.6
                     Compiled on Oct 20 2011 at 19:40:05
  ========================================================================
</screen>

Then you get a new X11 window containing the VGA display of the simulated
machine.  First you see the VGA BIOS screen, then Linux uncompresses and
boots, and you get a login prompt.  Type "root" and ENTER to log in to
DLX linux.
<figure>
<title>Screenshot of Bochs running DLX Linux</title>
<graphic format="PNG" fileref="../images/dlxlinux-in-linux.png">
</figure>
</para>

<para>
Booting is complete when you see "dlx login:" and a cursor.  At this login
prompt, type "root".  On UNIX systems, root is the system admin user.
There is no password for root on this sample disk image, so it lets you log
in without typing any password.  Now you should see a UNIX prompt, and you
can begin to type UNIX commands.
</para>

<screen>
  Welcome to DLX V1.0 (C) 1995-96 Erich Boehm
                      (C) 1995    Hannes Boehm

  dlx login: <command>root</command>
  Linux 1.3.89.
  dlx:~# <command>pwd</command>
  /root
  dlx:~# <command>cd /</command>
  dlx:~# <command>ls</command>
  bin/       etc/       lost+found/       root/       usr/
  boot/      fd/        mnt/              sbin/       var/
  dev/       lib/       proc/             tmp/        zip/
  dlx:/# <command>df</command>
  Filesystem    1024-blocks   Used  Available Capacity Mounted on
  /dev/hda1        10060      2736      6005     29%   /
  dlx:/# _
</screen>

<para>
When you get tired of playing with DLX Linux, just type "reboot" in the Bochs
window to shut down the DLX Linux operating system, and when it starts
to reboot again press the "Power" button at the top of the Bochs display
to end the application.
</para>


<para>
Here is a list of the files that are installed by the RPM, and a brief
description of each one.
</para>

<table><title>Files in RPM package</title>
<tgroup cols="2" align="left" colsep="1" rowsep="1">
<thead> <row> <entry>File</entry> <entry>Description</entry> </row>
</thead>
<tbody>

<row><entry>/usr/share/doc/bochs/CHANGES</entry> <entry> what has changed between versions </entry> </row>
<row><entry>/usr/share/doc/bochs/COPYING</entry> <entry> copy of the LGPL license </entry> </row>
<row><entry>/usr/share/doc/bochs/README</entry> <entry> the read-me file from the source distribution. </entry> </row>
<row><entry>/usr/share/doc/bochs/TODO</entry> <entry> the TODO file from the source distribution. </entry> </row>
<row><entry>/usr/bin/bochs </entry> <entry> the main Bochs executable </entry> </row>
<row><entry>/usr/bin/bximage </entry> <entry> tool for making new disk images </entry> </row>
<row><entry>/usr/bin/bxcommit </entry> <entry> tool for committing redologs to flat disk images </entry> </row>
<row><entry>/usr/lib/bochs/plugins/* </entry> <entry> device and gui plugins for Bochs (plugin version only) </entry> </row>
<row><entry>/usr/share/doc/bochs/bochsrc-sample.txt</entry> <entry> sample Bochs configuration file </entry> </row>
<row><entry>/usr/share/man/man1/* </entry> <entry> man pages for bochs, bochs-dlx, bximage and bxcommit</entry> </row>
<row><entry>/usr/share/man/man5/* </entry> <entry> man page for bochsrc </entry> </row>
<row><entry>/usr/share/doc/bochs/index.html</entry> <entry> a local copy of all Bochs documentation ( <ulink url="http://bochs.sourceforge.net/doc/docbook/index.html">Online copy</ulink> )</entry> </row>
<row><entry>/usr/share/bochs/BIOS-bochs-latest </entry> <entry> default ROM BIOS image for Bochs </entry> </row>
<row><entry>/usr/share/bochs/BIOS-bochs-legacy </entry> <entry> ROM BIOS image without 32-bit init code </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-elpin-2.40 </entry> <entry> VGA BIOS image for Bochs </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-elpin-LICENSE </entry> <entry> license for VGA BIOS </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-lgpl-latest </entry> <entry> LGPL'd VGA BIOS image for Bochs </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-lgpl-latest-debug </entry> <entry> LGPL'd VGA BIOS image for Bochs with debug output to the logfile </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-lgpl-latest-cirrus </entry> <entry> LGPL'd VGA BIOS image for Bochs with the Cirrus extension enabled </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-lgpl-latest-cirrus-debug </entry> <entry> LGPL'd VGA BIOS image for Bochs with the Cirrus extension enabled and debug output to the logfile </entry> </row>
<row><entry>/usr/share/bochs/VGABIOS-lgpl-README </entry> <entry> readme for the LGPL'd VGA BIOS </entry> </row>
<row><entry>/usr/bin/bochs-dlx </entry> <entry> run this script to try out DLX Linux inside Bochs!</entry> </row>
<row><entry>/usr/share/bochs/dlxlinux/ </entry> <entry> directory containing DLX linux sample disk image and configuration files</entry> </row>
<row><entry>/usr/share/bochs/dlxlinux/readme.txt</entry> <entry> description of DLX linux</entry> </row>
<row><entry>/usr/share/bochs/keymaps/*.map </entry> <entry>keymap tables for X11 and SDL </entry> </row>
</tbody>
</tgroup>
</table>


</section> <!-- end of Installing a Binary:Linux section -->

<section id="macosxdmg">
<title>MacOS X DMG</title>
<para>
This was contributed by Aard Vark in January 2003
</para>
<para>
The MacOS X binary distribution is a mountable disk
image (.dmg file). Once you've downloaded the binary
distribution file, just double click
on it to automatically unpack the archive and mount
the volume on the desktop.  An icon will appear
exactly as if you'd inserted a CD-ROM
or removable storage device, and a finder window
containing the volume should automatically open.
It is likely to have an odd name
such as _dmg_top, but don't worry about that.
</para>
<para>
Copy the Bochs-2.0 (or whatever version) folder from
the disk image onto your hard disk.  Either Home or
Applications would be sensible places to put it.
Because the disk image is mounted read only, you
can't run the included dlxlinux guest OS until
you've copied it to the hard disk.
</para>
<para>
Once you've installed the binaries, it's probably a
good idea to drag the _dmg_top volume to trash to
unmount it, so you don't get confused and try to
run bochs from there.  Then open
the bochs folder from wherever you installed it.
</para>
<para>
The MacOS X version of bochs requires a terminal
window to run. If you just double click on the Bochs
icon, you'll get an error message telling you to
double click on "bochs.scpt" to start
Bochs in a new terminal window.  You'll need to
configure Bochs before you will get very far with
the bochs.scpt in the top folder,
so to try out bochs open the dlxlinux folder and
double click on the bochs.scpt icon inside.
</para>
<para>
This will open a new terminal window which will
contain the Bochs startup messages, and a
configuration menu.  The default option is
[5], which starts the simulation, so press enter to
do so.  You will then get a new window containing
the VGA display of the simulated
machine.  The new window will probably appear behind
the current terminal window, so either click on the
bochs icon in the dock or the simulation window to
bring it to the front.  If you're quick
enough you'll then see the VGA BIOS screen, then
Linux  uncompresses and boots, and you get a login
prompt.  Type "root" and ENTER to log in to DLX Linux.
</para>
<para>
Once you've finished playing with DLX Linux, just
type "reboot" in the Bochs window to shut down the
DLX Linux operating system, and
when it starts to reboot again press the "Power"
button in the "MacBochs Hardware Controls" window
(it's the circle containing a vertical bar at the
far right - have a look at the Linux screenshots,
since the Mac version doesn't seem to have
descriptions or tool-tips).
</para>

</section> <!-- end of Installing a Binary:MacOS X section -->

</section> <!-- end of Installing a Binary -->

<section id="compiling"><title>Compiling Bochs</title>

<section><title>Standard Compile</title>
<para>
Bochs is written in C++, so you need a C++ compiler on your system.  Most
platforms have been tested with GNU gcc/g++, but other compilers are known
to work too.  By now, you should have unpacked your source TAR file or checked
out Bochs from SVN.  If not, you can return to <link
linkend="downloading">Downloading Bochs</link> for details.  The top level
directory of the source code will be referred to as &bochsdir;.  (&bochsdir;
contains the files <filename>bochs.h</filename> and
<filename>main.cc</filename> and subdirectories <filename>cpu</filename> and
<filename>bios</filename>.)
</para>

<para>
The standard compile process has three basic steps:
<command>configure</command>, <command>make</command>, and <command>make
install</command>.  Each step is described in a separate section below.  The
standard compile process is used on all Unix machines, MacOS X, and
Cygwin (win32).  There are separate instructions for <link
linkend="compiling-win32">compiling for Win32 with Microsoft VC++</link>.
</para>

<section id="configure"><title>Configure</title>

<para>
There is a script called <command>configure</command> which tests your
machine, C/C++ compiler and libraries to discover what settings should work on
your system.  If you run <command>configure</command> with no arguments after
it, defaults will be used for all settings.  To change the settings, you can
run <command>configure</command> with options that override the
defaults.  You can get a list of valid configure options by typing
<command>configure --help</command>.  One useful configure option is
--prefix=<replaceable>directory</replaceable>, which sets the directory in
which Bochs will be installed.  All the possible configure options are
documented in a <link linkend="config-opts">later section</link>.


</para>

<para>
Among other things, the configure script tries to detect your platform
and which compile options to use.  If you want to control this, set these
environment variables before running configure: <varname>CC</varname>,
<varname>CXX</varname>, <varname>CFLAGS</varname>,
<varname>CXXFLAGS</varname>.  Here is an example that sets the environment
variables, using bash/ksh<footnote>
<para>
The syntax for bash and ksh is given.  In csh and variants, use the syntax
<command>setenv <replaceable>VARIABLE</replaceable>
<replaceable>value</replaceable></command> to change environment variables.
Do not use an equal sign for csh!
</para>
</footnote>
syntax:
<screen>
  export CC=egcs
  export CXX="$CC"
  export CFLAGS="-Wall -O2 -m486 -fomit-frame-pointer -pipe"
  export CXXFLAGS="$CFLAGS"
</screen>
</para>

<para>
Once the configure script knows what options are selected,
it creates a Makefile in every source code directory, and creates
<filename>$BOCHS/config.h</filename> with all the option values written
as preprocessor #defines.  Now the sources are ready to compile.
</para>

<section><title>Configure Shortcut Scripts</title>
<para>
In the Bochs source directory, you will see a series of scripts called
<filename>.conf.<replaceable>platform</replaceable></filename>.
These scripts run the <command>configure</command> script for you, with a set of
options that are appropriate for that platform.  It is not necessary to
use the shortcut scripts; they are simply there to show you an example that
the developers have used. Some of these scripts have been used to build official
binary packages.

<tip>
<para>
If a shortcut script is "almost right" for you, just edit it and then run it!
If you run a shortcut script, you don't need to run configure manually.
</para>
</tip>

Run a shortcut script using Bourne shell, like this:
<screen>
  sh .conf.win32-vcpp
</screen>

These <filename>.conf.<replaceable>platform</replaceable></filename> have
been tested in recent Bochs versions:
<screen>
  .conf.linux
  .conf.sparc
  .conf.macos
  .conf.macosx
  .conf.win32-vcpp
  .conf.win32-cygwin
</screen>
</para>

</section> <!-- end of Configure Shortcut Scripts -->

</section> <!-- end of Compiling:Unix:Configure -->


<section><title>Make</title>
<para>
The <command>make</command> command compiles Bochs.  Make is a program
used by many software projects that reads the &Makefile; in each source
directory and follows the instructions that it finds there.  A &Makefile; tells
which files depend on which other files, what commands to use to compile and
link the code, and more.  After you have finished the configure step, just type
<command>make</command> to build the source code.
</para>

<para>
The reason that make is so popular is that it is smart about when to compile
and when not to compile.  If you run make once, it compiles every file.  But
when you run it again, it checks to see if any source files have been modified;
if not, there's nothing to do!  For example, the &Makefile; says that
<filename>main.o</filename> depends on <filename>main.cc</filename>.  Knowing
this, it will only compile <filename>main.cc</filename> if it is newer than
<filename>main.o</filename>.
</para>

<para>
Of course, make can only do the right thing if the &Makefile; lists all the
dependencies correctly, so human error can sometimes lead make astray.
If make refuses to build something that you think it should, or you
are getting strange compile errors, try doing <command>make all-clean</command>
and then <command>make</command> again.  All-clean means to clean up
the compiled files in every subdirectory, while <command>make clean</command>
means to clean up just the current directory<footnote>

<para>
This is different from the terminology of some other projects, and it may cause
confusion.  Sometimes "clean" implies that all subdirectories are affected.
</para>
</footnote>.  However, it's important to note that <command>make
all-clean</command> leaves the configuration intact.  You do not have
to run <command>configure</command> again.
</para>

<para>
If you're really in the mood for cleaning, <command>make dist-clean</command>
erases all the configuration information too.  In theory, after a dist-clean
your directory should look much like when you first untarred it or checked it
out.  There's usually some extra stuff lying around, but the &Makefile; tries
at least to erase any files that it created.
</para>

</section>

<section><title>Make Install</title>
<para>
Once the program has been built, the next step is typically to run
<command>make install</command> to copy the executables, documentation, and
other required files into a public place so that all users can use it.
By default the files are copied to some directories in /usr/local. The following
tables shows the directories and their contents.
<footnote><para>
&FIXME;
    make install_dlx option
</para></footnote>
</para>
<table><title>Installed files</title>
  <tgroup cols="2" align="left" colsep="1" rowsep="1">
  <tbody>
    <row>
      <entry>bin</entry>
      <entry>binary executables (bochs, bxcommit, bximage)</entry>
    </row>
    <row>
      <entry>lib/bochs/plugins</entry>
      <entry>plugins (if present)</entry>
    </row>
    <row>
      <entry>man/man1</entry>
      <entry>manpages for installed binaries</entry>
    </row>
    <row>
      <entry>man/man5</entry>
      <entry>manpage for the config file (bochsrc)</entry>
    </row>
    <row>
      <entry>share/bochs</entry>
      <entry>BIOS images, VGABIOS images, keymaps</entry>
    </row>
    <row>
      <entry>share/doc/bochs</entry>
      <entry>HTML docs, license, readme, changes, bochsrc sample</entry>
    </row>
  </tbody>
  </tgroup>
</table>
</section>

</section>  <!-- end of Compiling:Unix section -->

<section id="config-opts"><title>Configure Options</title>
<para>
This section describes the configure options for Bochs.  Perhaps the most
important option is <option>--help</option>, since it gives you a list of all
the other options.  The configure script will detect your platform and choose
the default GUI for your platform.  If the default choice is not what you
want, use the <option>--with-*</option> options to override the default.  The
options in the first table tell which GUI library is the default for each
platform.  Starting in version 2.0, you can use multiple
<option>--with-*</option> options at once to compile with multiple
display libraries, and then choose between them at runtime with the
<link linkend="bochsopt-displaylibrary">display_library option</link>
in the configuration file. Or, you can
let the configure script detect which libraries are on your system
and use them all, by configuring with --with-all-libs.
</para>
<note>
<para>
The concept of platform detection and default GUIs was added in Bochs 1.4.
In Bochs 1.3 and before, the X11 GUI was always the default.
</para>
</note>


<table><title>Defaults by Platform</title>
<tgroup cols="3" align="left" colsep="1" rowsep="1">
<thead>
  <row>
    <entry>Platform</entry>
    <entry>Default GUI</entry>
    <entry>Extra compile flags</entry>
  </row>
</thead>
<tbody>
  <row>
    <entry>win32, Cygwin or MinGW/MSYS</entry>
    <entry>--with-win32</entry>
    <entry>If using nmake method, compile using cl /nologo /MT /W3 /EHs-c- /DNDEBUG /DWIN32 /D_WINDOWS /D_CRT_SECURE_NO_WARNINGS.
    If using Visual C++ workspace, see the workspace file for compile settings.
    See <link linkend="compiling-win32">Compiling on Win32 with Microsoft VC++</link> for instructions.
    </entry>
  </row>
  <row>
    <entry>MacOS X or Darwin</entry>
    <entry>--with-carbon</entry>
    <entry>-fpascal-strings -fno-common -arch ppc -Wno-four-char-constants -Wno-unknown-pragmas -Dmacintosh
    </entry>
  </row>
  <row>
    <entry>MacOS 9 or before</entry>
    <entry>--with-macos</entry>
    <entry>none
    </entry>
  </row>
  <row>
    <entry>AmigaOS</entry>
    <entry>--with-amigaos</entry>
    <entry>none
    </entry>
  </row>
  <row>
    <entry>any other platform</entry>
    <entry>--with-x11</entry>
    <entry>none
    </entry>
  </row>
</tbody>
</tgroup>
</table>

<table><title>Configure Options to Select the Display Library (optional)</title>
<tgroup cols="2" align="left" colsep="1" rowsep="1">
  <thead>
    <row>
      <entry>Option</entry>
      <entry>Comments</entry>
   </row>
  </thead>
  <tbody>
    <row>
      <entry>--with-x11</entry>
      <entry>Use X windows user interface.  On many operating systems,
      Bochs will use X windows by default.
       </entry>
    </row>
    <row>
      <entry>--with-win32</entry>
      <entry>Use the native Win32 GUI. This is the default on win32 platforms.
      </entry>
    </row>
    <row>
      <entry>--with-carbon</entry>
      <entry>Compile for MacOS X with the Carbon GUI.  See the
      .conf.macosx file for the correct MacOS X compile options.
      </entry>
    </row>
    <row>
      <entry>--with-amigaos</entry>
      <entry>Compile for Amiga MorphOS.  This code is written by Nicholai
      Benalal.</entry>
    </row>

    <row>
      <entry>--with-rfb</entry>
      <entry>
        Enable support for the RFB protocol to talk to AT&amp;T's
        <ulink url="http://www.realvnc.com/">VNC Viewer</ulink>.
        Refer to <xref linkend="compile-rfb"> for details.
      </entry>
    </row>
    <row>
      <entry>--with-sdl</entry>
      <entry>Enable support for the SDL GUI interface; see <xref linkend="compile-sdl">.</entry>
    </row>
    <row>
      <entry>--with-term</entry>
      <entry>Use text-only gui with curses library.  Almost certainly
      won't work right with the debugger or the control panel.
      </entry>
    </row>
    <row>
      <entry>--with-macos</entry>
      <entry>Use Macintosh/CodeWarrior environment.  This is for running
        configure on a platform which supports running configure, so that
        you may then transfer the configured code over to the
        real compile environment.
        </entry>
    </row>
    <row>
      <entry>--with-wx</entry>
      <entry>
        Enable support for wxWidgets configuration and display interface;
        see <xref linkend="compile-wx">.
      </entry>
    </row>
    <row>
      <entry>--with-svga</entry>
      <entry>Use SVGALIB library for Linux.  This allows a full-screen
        text and graphics display without X windows.  The SVGALIB port
	was written by Igor Popik.
        </entry>
    </row>
    <row>
      <entry>--with-nogui</entry>
      <entry>No native GUI; just use blank stubs.  This is if you don't
          care about having video output, but are just running tests.
      </entry>
    </row>
    <row>
      <entry>--with-all-libs</entry>
      <entry>
      Automatically detect which libraries are installed on your system
      and enable them.  This option is still experimental; it might
      enable libraries that are not usable and cause the compile to fail.
      If you have trouble, just list the --with-* options for the specific
      display libraries that you want.
      </entry>
    </row>
  </tbody>
</tgroup>
</table>

<para>
The remaining options can generally be used with any GUI.  For each option
such as --enable-cdrom, you can also write --disable-cdrom to explicitly
turn it off.
</para>

<para>
&NEEDHELP; Link CPU link to the proper row, not to the beginning of the whole table, as it is now.
</para>

<table><title>Configure Options</title>
<tgroup cols="3" align="left" colsep="1" rowsep="1">
  <thead>
    <row>
      <entry>Option</entry>
      <entry>Default</entry>
      <entry>Comments</entry>
   </row>
  </thead>
  <tbody>
    <row id="configure-enable-cpu-level">
      <entry>--enable-cpu-level={<option>3,4,5,6</option>}</entry>
      <entry>6</entry>
      <entry>
      Select which CPU level to emulate.  Choices are 3,4,5,6 which mean to
      target 386, 486, Pentium, or Pentium Pro and later emulation.
      </entry>
    </row>
    <row>
      <entry>--enable-smp</entry>
      <entry>no</entry>
      <entry>
      Compile in support for SMP simulation.  This allows you to boot Linux and
      maybe other OSes in SMP mode, and bochs will simulate all the different
      CPUs and communication between them.  Do not expect this option to speed
      up your simulation!  On the contrary, it has to spend extra time simulating
      the different CPUs (even if they're mostly idle) and the communication
      between them. Use it to try out an SMP OS if you don't have an SMP machine,
      or to debug SMP OS drivers. Refer to <xref linkend="SMP"> for more details
      on SMP in Bochs.
      </entry>
    </row>
    <row>
      <entry>--enable-fpu</entry>
      <entry>yes</entry>
      <entry>If you want to compile Bochs to make use of the FPU emulator
          written by Stanislav Shwartsman, use this option.
      </entry>
    </row>
    <row>
      <entry>--enable-x86-64</entry>
      <entry>no</entry>
      <entry>
      Add support for x86-64 instruction set, written by Peter Tattam and Stanislav Shwartsman.
      </entry>
    </row>
    <row>
      <entry>--enable-vmx</entry>
      <entry>no</entry>
      <entry>Intel Virtualization Extensions (VMX) support</entry>
    </row>
    <row>
      <entry>--enable-avx</entry>
      <entry>no</entry>
      <entry>AVX instructions support</entry>
    </row>
    <row>
      <entry>--enable-x86-debugger</entry>
      <entry>no</entry>
      <entry>X86 debugger support.  If the software you run in bochs
          needs to use the x86 hardware debugging facilities such as
          DR0..DR7, instruction and data breakpoints etc., then you
          should use this option.  Otherwise don't use it, as it
          will slow down the emulation.</entry>
    </row>
    <row>
      <entry>--enable-monitor-mwait</entry>
      <entry>no</entry>
      <entry>MONITOR/MWAIT instructions support (still experimental)</entry>
    </row>
    <row>
      <entry>--enable-misaligned-sse</entry>
      <entry>no</entry>
      <entry>support for AMD's misaligned SSE extension</entry>
    </row>
    <row>
      <entry>--enable-configurable-msrs</entry>
      <entry>no</entry>
      <entry>support for user configurations of emulated MSR registers
          (see example in msrs.def)</entry>
    </row>
    <row>
      <entry>--enable-long-phy-address</entry>
      <entry>no</entry>
      <entry>support for guest physical address larger than 32 bit</entry>
    </row>
    <row>
      <entry>--enable-cdrom</entry>
      <entry>yes</entry>
      <entry>
      Enable use of a real CDROM.  The cdrom emulation is always present, and
      emulates a drive without media by default.  You can use this option to
      compile in support for accessing the media in your workstation's cdrom
      drive.  The supported platforms are Linux, Solaris, FreeBSD, OpenBSD, and Windows.
      For other platforms, a small amount of code specific to your platform
      must be written.  The module iodev/cdrom.cc is the place to add more
      support.  For the most part, you need to figure out the right set of
      ioctl() calls.
      </entry>
    </row>
    <row>
      <entry>--enable-sb16</entry>
      <entry>no</entry>
      <entry>
      Enable Sound Blaster emulation. The lowlevel sound interface is autodetected.
      See section <link linkend="sb16-emulation">Sound Blaster 16 Emulation</link>
      for supported platforms and more info. This option also enables the standard
      PC gameport which is a part of the SB16. If you don't want to use it, you
      might use <option>--disable-gameport</option>.
      </entry>
    </row>
    <row>
      <entry>--enable-es1370</entry>
      <entry>no</entry>
      <entry>
      Enable ES1370 sound emulation. Just like the SB16 option, the lowlevel sound
      interface is autodetected and the gameport is turned on.
      </entry>
    </row>
    <row>
      <entry>--enable-gameport</entry>
      <entry>no</entry>
      <entry>
      Enables the standard PC gameport. This option is only necessary if you want to
      have a gameport, but no SB16 (see above). The connection to a real joystick is
      currently supported on Linux and win32 only.
      </entry>
    </row>
    <row>
      <entry>--enable-idle-hack</entry>
      <entry>no</entry>
      <entry>
      Enables Roland Mainz's experimental idle code, which is intended to
      keep Bochs from always using 100% of CPU time.  When Bochs is waiting
      around for an interrupt, the idle code uses a select() loop and some
      X11 tricks to wait until user input arrives.  This is designed to
      keep Bochs responsive while still yielding to other processes when
      Bochs is idle. It only works with X11 or term GUI.
      </entry>
    </row>
    <row>
      <entry>--enable-ne2000</entry>
      <entry>no</entry>
      <entry>Enable NE2000 network card support.  This requires a
      low-level component to be written for each OS.  The NE2000
      option is only supported on FreeBSD, OpenBSD, Linux, and Windows
      9x/NT/2K/XP.  When enabled and configured, the NE2000 device model can
      talk to any computer on the network EXCEPT FOR the local host.
      Exception: Under most circumstances, Bochs can talk to the local host
      on Windows, and in the ethertap interface for Linux.
      </entry>
    </row>
    <row>
      <entry>--enable-pnic</entry>
      <entry>no</entry>
      <entry>Enable PCI pseudo NIC (network card) support.</entry>
    </row>
    <row>
      <entry>--enable-clgd54xx</entry>
      <entry>no</entry>
      <entry>Enable Cirrus Logic GD54xx (CL-GD5430 ISA or CL-GD5446 PCI) video
      card support. For more information see <xref linkend="cirrus-notes">.
      </entry>
    </row>
    <row>
      <entry>--enable-plugins</entry>
      <entry>no</entry>
      <entry>
      Plugins are shared libraries that can be loaded on demand.  Example: the
      serial device is implemented as a plugin.  In Unix, the serial plugin is
      called libbx_serial.so.  When Bochs reads its configuration file, if the
      serial device is enabled it loads libbx_serial.so.  See the Features
      section for supported platforms.
      </entry>
    </row>
    <row>
      <entry>--enable-repeat-speedups</entry>
      <entry>no</entry>
      <entry>enable support repeated I/O and memory copy speedups</entry>
    </row>
    <row>
      <entry>--enable-fast-function-calls</entry>
      <entry>no</entry>
      <entry>enable support for fast function calls (gcc on x86 only)</entry>
    </row>
    <row>
      <entry>--enable-handlers-chaining</entry>
      <entry>no</entry>
      <entry>enable support for handlers chaining optimization</entry>
    </row>
    <row>
      <entry>--enable-all-optimizations</entry>
      <entry>no</entry>
      <entry>
        Turn on the enables for all speed optimizations that the
        developers believe are safe to use:
         --enable-repeat-speedups,
         --enable-fast-function-calls,
         --enable-handlers-chaining.
      </entry>
    </row>
    <row>
      <entry>--enable-debugger</entry>
      <entry>no</entry>
      <entry>
        Compile in support for Bochs internal command-line debugger.  This has
        nothing to do with x86 hardware debug support.  It is a more powerful
        and non-intrusive native debugger.  Enabling this will of course slow
        down the emulation.  You only need this option if you know you need it.
        After you have run <command>./configure</command>, you may want to edit
        <filename>config.h</filename> to customize the debugger further;
        see <xref linkend="internal-debugger"> for more information.
      </entry>
    </row>
    <row>
      <entry>--enable-readline</entry>
      <entry>detected by configure</entry>
      <entry>
      Compile the debugger with the GNU readline library, which gives
      command line editing and history.
      </entry>
    </row>
    <row>
      <entry>--enable-disasm</entry>
      <entry>yes</entry>
      <entry>Compile in support for built-in disassembler.  Bochs has
          a built-in disassembler, which is useful if you either
          run the built-in debugger (--enable-debugger), or want
          disassembly of the current instruction when there is a
          panic in bochs.</entry>
    </row>
    <row>
      <entry>--enable-cpp</entry>
      <entry>no</entry>
      <entry>
      Use .cpp as C++ suffix. Renames all the .cc files to .cpp for use with
      compilers which want that, like older MS C++ compilers. Don't use this
      option unless you know you need it.
      </entry>
    </row>
    <row>
      <entry>--enable-docbook</entry>
      <entry>detected</entry>
      <entry>
      Build the docbook documentation in doc/docbook.  The configure
      script will enable this option automatically if you have a program
      called docbook2html installed.
      </entry>
    </row>
    <row>
      <entry>--enable-iodebug</entry>
      <entry>yes if debugger is on</entry>
      <entry>
      Dave Poirier has written an experimental interface to the debugger
      using I/O ports, so that software running in the guest OS can access
      features of the debugger.  You only want this option if you are
      developing guest OS code for use in Bochs.  In other words, most people
      don't.  Also, it should only be used with --enable-debugger.  See the
      <ulink url="http://bochs.sourceforge.net/doc/docbook/development/iodebug.html">
      developer documentation</ulink> for details.
      </entry>
    </row>
    <row>
      <entry>--enable-pci</entry>
      <entry>no</entry>
      <entry>Enable limited i440FX PCI support. This is still incomplete, but usable.
      </entry>
    </row>
    <row>
      <entry>--enable-pcidev</entry>
      <entry>no</entry>
      <entry>
        Enable PCI host device mapping support. This requires --enable-pci
        to be set as well as Linux 2.4 or 2.6 as host.
      </entry>
    </row>
    <row>
      <entry>--enable-usb</entry>
      <entry>no</entry>
      <entry>
        Enable i440FX PCI USB support (UHCI). The host controller with 2-port
        root hub and 6 USB device types are available.
      </entry>
    </row>
    <row>
      <entry>--enable-usb-ohci</entry>
      <entry>no</entry>
      <entry>
        Enable experimental USB OHCI support. The host controller with 2-port
        root hub is available (USB device types: same as UHCI).
      </entry>
    </row>
    <row>
      <entry>--enable-instrumentation=<option>directory</option></entry>
      <entry>no</entry>
      <entry>
      Compile in support for instrumentation.  This allows you to collect
      instrumentation data from bochs as it executes code.  You have to create
      your own instrumentation library and define the instrumentation macros
      (hooks in bochs) to either call your library functions or not, depending
      upon whether you want to collect each piece of data.
      </entry>
    </row>
    <row>
      <entry>--enable-xpm</entry>
      <entry>yes</entry>
      <entry>
      Enables the check for the XPM library. This option is only valid if the
      x display library is enabled (<option>--with-x11</option>).
      </entry>
    </row>
    <row>
      <entry>--enable-show-ips</entry>
      <entry>no</entry>
      <entry>
      Enables logging of measured IPS, see the <command>ips</command> parameter
      of the <link linkend="bochsopt-cpu">cpu option</link>.
      </entry>
    </row>
  </tbody>
</tgroup>
</table>

</section> <!-- end of Configure Options -->




<section><title>Transcript of Successful Compilation</title>
<para>
<screen>
  user$ <command>ls -l bochs-1.2.1.tar.gz</command>
  -rw-rw-r--    1 user     user       887993 Sep 15 23:24 bochs-1.2.1.tar.gz
  user$ <command>gunzip -c bochs-1.2.1.tar.gz | tar -xvf -</command>
  bochs-1.2.1/
  bochs-1.2.1/bios/
  bochs-1.2.1/bios/BIOS-bochs-2-processors
  bochs-1.2.1/bios/Makefile.in
    .
    .
    .
  bochs-1.2.1/patches/NOTES
  bochs-1.2.1/patches/patch.4meg-pages
  bochs-1.2.1/patches/patch.goswin-changes
  user$ <command>cd bochs-1.2.1</command>
  user$ <command>./configure --enable-cdrom</command>
  creating cache ./config.cache
  checking for gcc... gcc
  checking whether the C compiler (gcc  ) works... yes
  checking whether the C compiler (gcc  ) is a cross-compiler... no
  checking whether we are using GNU C... yes
  checking whether gcc accepts -g... yes
    .
    .
    .
  creating misc/Makefile
  creating dynamic/Makefile
  creating fpu/Makefile
  creating config.h
  user$ <command>make</command>
  cd iodev && \
  make CC="gcc" CXX="c++" CFLAGS="-g -O2  " CXXFLAGS="-g -O2  " LDFLAGS="" LIBS="" X_LIBS="-L/usr/X11R6/lib" X_PRE_LIBS="-lSM -lICE" prefix="/usr/local" exec_prefix="/usr/local" bindir="/usr/local/bin" infodir="" libiodev.a
  make[1]: Entering directory `/tmp/bochs-1.2.1/iodev'
  c++ -c -g -O2    -I.. -I../instrument/stubs devices.cc -o devices.o
  c++ -c -g -O2    -I.. -I../instrument/stubs pic.cc -o pic.o
  c++ -c -g -O2    -I.. -I../instrument/stubs pit.cc -o pit.o
  c++ -c -g -O2    -I.. -I../instrument/stubs unmapped.cc -o unmapped.o
  c++ -c -g -O2    -I.. -I../instrument/stubs cmos.cc -o cmos.o
    .
    .
    .
  echo done
  done
  c++ -o bochs -g -O2   main.o load32bitOShack.o state_file.o pc_system.o osdep.o \
     iodev/libiodev.a \
     cpu/libcpu.a memory/libmemory.a gui/libgui.a \
     fpu/libfpu.a \
     -L/usr/X11R6/lib -lSM -lICE -lX11
  gcc -c -g -O2    -I. -Iinstrument/stubs misc/bximage.c -o misc/bximage.o
  c++ -o bximage -g -O2   misc/bximage.o
  user$ <command>su</command>
  root# <command>make install</command>
  cd iodev && \
  make CC="gcc" CXX="c++" CFLAGS="-g -O2  " CXXFLAGS="-g -O2  " LDFLAGS="" LIBS="" X_LIBS="-L/usr/X11R6/lib" X_PRE_LIBS="-lSM -lICE" prefix="/usr/local" exec_prefix="/usr/local" bindir="/usr/local/bin" infodir="" libiodev.a
  make[1]: Entering directory `/tmp/bochs-1.2.1/iodev'
    .
    .
    .
  /usr/local/bochs/1.2.1/install-x11-fonts
  Looking for fonts to install... font/
  Looking for X11 Font Path... /usr/lib/X11/fonts
  Installing vga.pcf... ok    (it was already there)
  Running mkfontdir...
  Done installing Bochs fonts for X11.
  root# <command>exit</command>
  user$ _
</screen>
</para>
</section> <!-- end of Transcript -->


<section id="compiling-win32"><title>Compiling on Win32 with Microsoft VC++</title>
<para>
The standard compile uses the configure script, but the Windows platform
cannot run the configure script natively.
The current solution to this problem is that the Bochs
configure script must be run on a different platform that does support
shell scripts, with options that cause it to configure for a Win32
platform instead of the native one.  Many people have access to a UNIX
machine that could run the configure script, or you can use Cygwin or
MinGW/MSYS to run the configure script.
<footnote>
<para>
Because Bochs depends so much on the configure script, if you are doing
much win32 Bochs development, you should consider downloading Cygwin or
MinGW/MSYS so that you can run the configure step natively.
</para>
</footnote>.
</para>

<para>
Download the Bochs sources on a machine that can run shell scripts.
Edit the configure shortcut script <filename>.conf.win32-vcpp</filename>
if you want to adjust the configure options.  Then type these commands
in the Bochs source directory:
<screen>
  sh .conf.win32-vcpp
  make win32_snap
</screen>
These commands will run the configure step, produce VC++ makefiles and
workspace files, and pack it all into a .zip file in the directory above the
source directory <footnote>
<para>
If the source directory is <filename>/home/joe/bochs-win32</filename>, the
resulting .zip file is in <filename>/home/joe/bochs-win32-msvc-src.zip</filename>.
</para>
</footnote>.  The .zip file is all ready to transfer to the target Windows
machine to be unzipped and compiled.  Or, if you run the sh/make steps in
Cygwin, you are already on the target machine so you don't need the .zip
file.
</para>

<para>
When you have the Win32 sources transferred to a Windows machine with VC++,
find the workspace file called <filename>bochs.sln</filename> in the folder
"vs2008" and load it in VC++. Choose <command>Project:Set Active Project</command>
and be sure that "bochs" is selected. Then choose <command>Build:Build bochs.exe</command>.
This will build all the required libraries (iodev, cpu, etc.) and the auxiliary
programs <filename>bximage.exe</filename>, <filename>bxcommit.exe</filename>
and <filename>niclist.exe</filename>.
</para>

<para>
Using workspaces is easy and intuitive, but there is one caveat. The workspaces
come directly out of a ZIP file in <filename>build/win32/vs2008ex-workspace.zip</filename>,
and they are not controlled by the configure script. When you compile with certain
configure options (e.g. --with-sdl) you need to link with additional libraries.
For now you must add them to the VC++ workspace by hand. In version 2.0, we have improved
the situation considerably by adding #if...#endif around every optional file
and including nearly every Bochs source file in the workspace.  This solves the
problem of having to manually add source files to the workspace when you turn
on configure options such as --enable-debugger.  The problem of adding
link libraries remains unresolved.
</para>

<tip>
<para>
To compile with the Bochs debugger enabled, add "--enable-debugger" to the
configure line in <filename>.conf.win32-vcpp</filename> before running it.
No modifications to the workspace are necessary.
</para> </tip>

<para>
An alternative way to compile is to run <filename>nmake.exe</filename> in an
MS-DOS window.  Instead of using the workspace files, nmake uses the Bochs
makefiles that are generated by configure.  The workspace file was new in
version 1.3; before that, nmake was the only way to compile Bochs in VC++.
Starting with version 1.4, the workspace is used to build the release
binaries.
</para>

<para>
The <command>make install</command> for Win32 is presently broken.  In the
future, a <command>make install</command> that runs in Cygwin may be provided.
</para>

</section>  <!-- end of Compiling:win32 -->

<section id="compile-cygwin"><title>Compiling on Win32 with Cygwin</title>
<para>Cygwin is a free Unix-like environment for Windows written by
Steve Chamberlain and now maintained by RedHat, Inc.  You can download
it from <ulink url="http://www.cygwin.com">www.cygwin.com</ulink>.  Because
Cygwin supports the configure script and uses GNU gcc/g++, you can use the
standard compile process.  The configure script should automatically detect
Cygwin and add "-mno-cygwin -DWIN32" to the compiler options.  You should
get a working Bochs if you just type:
<screen>
  configure
  make
</screen>

Optionally, you can use the configure shortcut script for Cygwin,
<filename>.conf.win32-cygwin</filename>, instead of running configure
directly.  If this script is close to what you need, just edit the script and
then run it.  To use the configure shortcut script and compile in Cygwin, the
commands are
<screen>
  sh .conf.win32-cygwin
  make
</screen>
To find out the options which are known to work in Cygwin, open the file
<filename>.conf.win32-cygwin</filename> in any text editor/viewer and have
a look at the end of that file.
</para>
</section>  <!-- end of cygwin -->

<section id="compile-macos9-codewarrior"><title>Compiling on MacOS 9 with CodeWarrior</title>
<para>
  It is possible that this hasn't been tried since 1999. In theory, you
  run <command>sh .conf.macos</command> on a Unix box to build the
  makefiles and headers, copy the whole thing over to a Mac, and then
  use CodeWarrior to compile. Since it hasn't been tested in so long,
  it is quite likely that some work is needed to bring the Mac port up
  to date.
</para>
<para>
  If you are interested and have the required MacOS development tools, please
  let us know by contacting the &devlist;. Someone requests a MacOS port
  almost once a month, but none of the developers know how to help them.
</para>
</section><!-- end: Compiling on MacOS 9 with CodeWarrior -->

<section id="compile-macosx"><title>Compiling on MacOS X</title>
<para>
The port to MacOS X with Carbon API by Emmanuel Mailliard is quite new, and the
configure and makefile support was added by Bryce Denney.  You will need
the compiler and libraries from the development tools CD.  Bochs should
configure and compile with the Carbon GUI if you simply type:
<screen>
  configure
  make
</screen>
Optionally, you can use the configure shortcut script for MacOS X,
<filename>.conf.macosx</filename>, instead of running configure directly.
If this script is close to what you need, just edit the script and then
run it.  To use the configure shortcut script and compile, the commands
are
<screen>
  sh .conf.macosx
  make
</screen>

MacOS X has a special format for an application bundle, which looks like a
directory that contains the required resource files and binaries.  The Makefile
currently creates this application bundle "by hand" using mkdir and copy, which
is surely the wrong way to do it.  Bryce doesn't know the official way to
create an application from a Makefile, so this hack will remain until a real
Mac developer helps to clean it up.
</para>

<para>
On MacOS X the default GUI is the Carbon interface, but you can also try other
Bochs GUIs. Use <option>--with-x11</option> for X windows,
<option>--with-rfb</option> for VNC/RFB, or <option>--with-sdl</option> for SDL.
</para>
</section><!-- end: Compiling on MacOS X -->

<section id="compile-morphos"><title>Compiling on Amiga/MorphOS</title>
<para>
  Nicholai Benalal created this port to MorphOS running on Amiga. It should
  compile with:
<screen>
  configure
  make
</screen>
  If the platform is not detected properly, you might need to use
  <option>--enable-amigaos</option> as a configure option. Optionally, you
  can use the configure shortcut script, <filename>.conf.amigaos</filename>.
</para>
</section><!-- end: Compiling on Amiga/MorphOS -->

<section id="compile-rfb"><title>Compiling with the RFB interface</title>
<para>
  The RFB code was written by Don Becker <email>x-odus@iname.com</email>,
  who has a Bochs-RFB web page on his site,
  <ulink url="http://www.psyon.org/bochs-rfb/">http://www.psyon.org/bochs-rfb/</ulink>.
</para>
<para>
  This interface allows you to view the Bochs display with
  AT&amp;T's <ulink url="http://www.realvnc.com/">VNC Viewer</ulink>.
  The protocol used between a VNC server and a VNC viewer is called RFB.
  Because the RFB code in Bochs is written with portable network socket
  and POSIX thread code, it can be compiled on many platforms and has
  been tested in Linux and Win32. No additional libraries are required.
  To try it, type:
<screen>
  configure --with-rfb
  make
</screen>
  RFB currently uses this setup:
<itemizedlist>
  <listitem><para>port range 5900 to 5949 (using the first one available)</para></listitem>
  <listitem><para>no authentification</para></listitem>
  <listitem><para>30 seconds waiting for client</para></listitem>
  <listitem><para>8 bpp (BGR233) supported only</para></listitem>
  <listitem><para>desktop size 720x480 (for text mode and standard VGA)</para></listitem>
</itemizedlist>
</para>
</section><!-- end compile-rfb -->

<section id="compile-sdl"><title>Compiling with the SDL interface</title>
<para>
  Dave Poirier has written an SDL interface for Bochs. Simple DirectMedia
  Layer, or SDL, is a cross-platform multimedia library distributed from
  <ulink url="http://libsdl.org/">libsdl.org</ulink>. SDL is available
  for many platforms including Win32, Linux, BSD, IRIX, MacOS, MacOS X,
  and AmigaOS.
</para>
<para>
  To compile Bochs with SDL, you must first install the SDL library
  from <ulink url="http://libsdl.org/">libsdl.org</ulink>. You
  can either get the source code and compile it yourself, or install
  the development libraries for your platform (already compiled).
  Then, go into the Bochs directory and type:
<screen>
  configure --with-sdl
  make
</screen>
</para>
<para>
  If you are on FreeBSD and have SDL installed using the ports collection, Bochs
  won't be able to find the library automatically, as the SDL config script is
  called <filename>sdl11-config</filename> in that case (even for version 1.2).
  The easiest way to make Bochs find it, is to create a symlink to that script
  called <filename>sdl-config</filename> inside a directory which is in the path.
  For example:
<screen>
  ln -s /usr/local/bin/sdl11-config ~/bin/sdl-config
</screen>
</para>
<para>
To compile in Microsoft VC++, you have to configure on a different system.
Here's the procedure:
<screen>
- On a machine that can run shell scripts, such as Cygwin, run
    configure --target=pentium-windows --with-sdl
    make win32_snap
- Copy the resulting ZIP file to your Windows box and unzip it.
- Load up workspace called bochs.dsw in VC++ 6.0
- Double click "gui files"
- Remove gui/win32.cpp from the project, and add gui/sdl.cpp instead.
- Edit the settings of "gui files".  Under C/C++ tab, category=preprocessor,
  additional include directories, add the directory where SDL/SDL.h can be
  found.
- Edit the settings of the "bochs files" project.  Under the Link tab,
  category=General, add SDL.lib to object/library modules list.  Then in
  category=Input, add the path of SDL.lib to additional library path.  Click
  ok.
- Select Build:Build Bochs.exe
</screen>
</para>
</section><!-- end compile-sdl -->

<section id="compile-wx">
<title>Compiling with the wxWidgets interface</title>
<para>
  wxWidgets is a cross-platform C++ user interface library which
  you can download for free at <ulink url="http://wxwidgets.org/">wxwidgets.org</ulink>.
  The wxWidgets port of Bochs provides both a graphical configuration interface for
  editing <filename>bochsrc</filename> options (see
  <link linkend="bochsopt-configinterface">config_interface option</link>) and a
  display (see <link linkend="bochsopt-displaylibrary">display_library option</link>).
  It was written by Bryce Denney, Don Becker, Dave Poirier, and Volker Ruppert.
<screen>
  configure --with-wx
  make
</screen>
</para>
<para>
  If you want Bochs to use a wxWidgets installation not in your path (but installed
  somewhere else), you need to set the WX_CONFIG environment variable to the
  proper wx-config script, before running configure (example for csh):
<screen>
  setenv WX_CONFIG '/home/compile/wx/bin/wx-config'
</screen>
</para>
</section>

<section><title>Building an RPM on Linux</title>
<para>
RPM stands for "RedHat Package Manager."  An RPM is a compressed file
containing files to be installed on your system.  Bochs
has a special shell script called <filename>make-rpm</filename> that helps
to build an RPM of Bochs.  Start with a clean source directory.  Edit
.conf.linux first if you want to adjust the configure options.
Then, type:

<screen>
  ./build/redhat/make-rpm | tee /tmp/build.txt
</screen>

When this command completes, you should have a source RPM and a binary RPM of
Bochs in the current directory.  The <command>tee</command> part of the
command (optional) saves a transcript of the build process into /tmp/build.txt,
which is very useful if anything goes wrong.  Instructions for installing an
RPM are <link linkend="linuxrpm">here</link>.
</para>

<note><para>
In the past, you had to build rpms as root, but as of version 2.0 you can build
them as a normal user.
</para></note>

</section> <!-- end of Building an RPM -->



<section><title>Compile Problems</title>
<para>
&FIXME;
</para>
<para>
<screen>
what if configure fails?
- tar up config.* and send to bochs-developers
- report the problem with a source forge bug report.

what if make fails?
- try make dist-clean, and run configure and make again
- use configure options to disable options.  For example, if errors in
fpu/fpu.cc, you could try --disable-fpu.
- search for the error on the Bochs website (bug reports, patches)
- if familiar with C++, many minor problems can be corrected
- move to more stable code.  if it's SVN, see if a release version will
  compile.  Report problem to bochs-developers.
- report the problem with a source forge bug report.
</screen>

</para>
</section>
</section> <!-- end of Compiling Bochs -->
</chapter>



<chapter id="setup"><title>Setup</title>
<section><title>What does Bochs need?</title>
<para>
These are the minimum requirements for running an OS inside of Bochs:
<itemizedlist>
<listitem>
<para>
the Bochs executable
</para>
</listitem>
<listitem>
<para>
the BIOS image (usually called <filename>BIOS-bochs-latest</filename>)
</para>
</listitem>
<listitem>
<para>
the VGA BIOS image (e.g. <filename>VGABIOS-lgpl-latest</filename> or <filename>VGABIOS-elpin-2.40</filename>)
</para>
</listitem>
<listitem>
<para>
at least one bootable media, either as disk image (floppy, hard disk or CD-ROM) or physical disk (floppy or CD-ROM)
</para>
</listitem>
</itemizedlist>
</para>

<note><para>
Both VGA BIOS versions as well as the ROM BIOS are part of Bochs. No separate download is necessary.
</para></note>

<note><para>
If you want to use the Cirrus SVGA adapter instead of VGA + Bochs VBE, you should
have a look at <xref linkend="cirrus-notes">.
</para></note>

<para>
In that case you have to pass the configuration options on the command
line or to use the configuration interface to set up Bochs for the simulation.
Running Bochs is easier if you use a configuration file (we call it
<filename>bochsrc</filename>). See <xref linkend="bochsrc"> for all supported options.
</para>

<para>
The easiest way to setup Bochs for the first time is to use the example configuration
file called <filename>bochsrc-sample.txt</filename>. Locate that file (location depends
on the (host) OS and on the installation facility used) and copy it to a location where
Bochs looks for that file, see <xref linkend="search-order">.
</para>

<para>
The next step is to change the configuration so that it fits your needs: You most
likely want to setup a hard disk (see <xref linkend="using-bximage"> and
<xref linkend="bochsopt-ata-master-slave">), and install some OS on it using either
a set of floppy disks (see <xref linkend="bochsopt-floppyab">) or a CD-ROM
(see <xref linkend="bochsopt-ata-master-slave"> again) as installation media.
Make sure you boot the emulation from the media you want, using the right setting
as <link linkend="bochsopt-boot">boot option</link>.
</para>

<para>
If your keyboard output inside of Bochs is wrong, you may also need a keymap file
to remap your keyboard layout to the U.S. layout. A set of keymap files for the
X window system and SDL (Linux port) is distributed with Bochs. If your
keyboard layout is not supported yet, you can create your own one by following the
instructions given in <xref linkend="keymap">.
</para>

<para>
A collection of disk images  of different operating systems can be found at
<ulink url="http://bochs.sourceforge.net/diskimages.html"></ulink>. Some disk
images are the size of a floppy disk (1 meg compressed) and others are gigantic
(160 meg compressed). If you want to create a disk image yourself, please see
<xref linkend="diskimagehowto">.
</para>

<para> &FIXME; This should be completed </para>
<para>
<screen>
  - BIOS/VGABIOS, what do they do?
</screen>
</para>
</section>


<section id="bochsrc">
<title>bochsrc</title>
<para>
Bochs uses a configuration file called <filename>bochsrc</filename> to know
where to look for disk images, how the Bochs emulation layer should work, etc.
When you first start up Bochs, it looks around for its configuration file
(see <xref linkend="search-order">), and parses it.
Here are a few lines from a sample file:
<screen>
  ata0-master: type=disk, path="30M.sample", cylinders=615, heads=6, spt=17
  boot: disk
</screen>
The format is very strict, so be sure to put the right number of spaces and
use lowercase letters.  As you can see, most lines have a keyword telling what
is being configured, followed by a colon, followed by a few
<varname>variable</varname>=<varname>value</varname> pairs, separated by
commas.  For very simple options, sometimes just a single value is needed.
The source and binary distributions come with a sample
<filename>bochsrc</filename>, so you can just copy the sample file and edit the
settings you need to change.
</para>

<para>
The syntax used for <filename>bochsrc</filename> can also be used as command line arguments for Bochs.
If you have any spaces in your command line arguments, they should be enclosed
in single quotes, for example:
<screen>
  bochs 'boot:floppy' 'floppya: 1_44=a.img, status=inserted'
</screen>
For other arguments, see section <link linkend="commandline">Command line arguments</link>.
</para>

<para>
Starting with version 1.3, you can use environment variables in
the <filename>bochsrc</filename> file, for example:
<screen>
  floppya: 1_44="$IMAGES/bootdisk.img", status=inserted
  boot: floppy
</screen>
Starting with version 2.0, two environment variables have a built-in
default value which is set at compile time.  $BXSHARE points to the
"share" directory which is typically /usr/local/share/bochs on UNIX
machines.  See the $(sharedir) variable in the Makefile for the exact
value.  $BXSHARE is used by disk images to locate the directory where
the BIOS images and keymaps can be found.  If $BXSHARE is not defined, Bochs
will supply the default value.  Also, $LTDL_LIBRARY_PATH points to a list of
directories (separated by colons if more than one) to search in for Bochs
plugins.  A compile-time default is provided if this variable is not defined
by the user.  On Win32 and MacOSX, the default for the share directory is
determined by a platform-specific specific algorithm.  On Win32, we use the
registry to see what directory Bochs and its support files were installed in.
On MacOSX, the share directory is the directory where the application is
located.
</para>

<para>
Starting with version 2.0, you can can use #include in the bochsrc to read the
configuration from other files. Now it is possible to put platform or
installation defaults in a global config file (e.g. location of rom images).
Put this on top of your config file if the global configuration is stored in /etc:
<screen>
 #include /etc/bochsrc
</screen>
</para>

<para>
The section below lists all the supported <filename>bochsrc</filename> options.
</para>

<section id="bochsopt-megs"><title>megs</title>
<para>
Examples:
<screen>
  megs: 32
  megs: 128
</screen>
Set the number of megabytes of physical memory you want to emulate. The default
is 32MB; most OS's won't need more than that. The maximum amount of memory
supported is 2048MB.
</para>

<note><para>
Due to limitations in the host OS, Bochs fails to allocated even 1024MB on most systems.
</para></note>
</section>

<section id="bochsopt-cpu"><title>cpu</title>
<para>
Example:
<screen>
  cpu: count=2, ips=10000000
</screen>
This defines the parameters of the cpu inside Bochs:
</para>
<para><command>count</command></para>
<para>
Set the number of processors:cores per processor:threads per core when Bochs
is compiled for SMP emulation. Bochs currently supports up to 8 processors.
If Bochs is compiled without SMP support, it won't accept values different from 1.
For more information on SMP see <xref linkend="SMP">.
</para>
<para><command>quantum</command></para>
<para>
Maximum amount of instructions allowed to execute by processor before
returning control to another cpu. This option exists only in Bochs
binary compiled with SMP support.
</para>
<para><command>reset_on_triple_fault</command></para>
<para>
Reset the CPU when triple fault occur (highly recommended) rather than PANIC.
Remember that if you are trying to continue after triple fault the simulation
will be completely bogus !
</para>
<para><command>cpuid_limit_winnt</command></para>
<para>
Determine whether to limit maximum CPUID function to 2. This mode is required
to workaround WinNT installation and boot issues.
</para>
<para><command>msrs</command></para>
<para>
Define path to user CPU Model Specific Registers (MSRs) specification.
See example in msrs.def.
</para>
<para><command>ignore_bad_msrs</command></para>
<para>
Ignore MSR references that Bochs does not understand; print a warning message
instead of generating #GP exception. This option is enabled by default but 
will not be avaiable if configurable MSRs are enabled.
</para>
<para><command>ips</command></para>
<para>
Emulated Instructions Per Second.  This is the number of IPS that Bochs is
capable of running on your machine.  You can recompile Bochs with
<option>--enable-show-ips</option> option enabled, to find your workstation's capability.
Measured IPS value will then be logged into your <link linkend="bochsopt-log">log file</link>
or in the status bar (if supported by the gui).
</para>

<para>
IPS is used to calibrate many time-dependent events within the Bochs
simulation.  For example, changing IPS affects the frequency of VGA updates,
the duration of time before a key starts to autorepeat, and the measurement
of BogoMips and other benchmarks.  The table below lists some typical
IPS settings for different machines<footnote><para>IPS measurements depend on
OS and compiler configuration in addition to processor clock
speed.</para></footnote>.
</para>

<table><title>Example IPS Settings</title>
  <tgroup cols="3" align="left" colsep="1" rowsep="1">
<thead>
  <row>
    <entry>Bochs</entry>
    <entry>Speed</entry>
    <entry>Machine/Compiler</entry>
    <entry>Typical IPS</entry>
  </row>
</thead>
  <tbody>
<row><entry>2.4.6</entry><entry>3.4Ghz</entry><entry>Intel Core i7 2600 with Win7x64/g++ 4.5.2 </entry><entry> 85 to 95 MIPS</entry></row>
<row><entry>2.3.7</entry><entry>3.2Ghz</entry><entry>Intel Core 2 Q9770 with WinXP/g++ 3.4 </entry><entry> 50 to 55 MIPS</entry></row>
<row><entry>2.3.7</entry><entry>2.6Ghz</entry><entry>Intel Core 2 Duo with WinXP/g++ 3.4 </entry><entry> 38 to 43 MIPS</entry></row>
<row><entry>2.2.6</entry><entry>2.6Ghz</entry><entry>Intel Core 2 Duo with WinXP/g++ 3.4 </entry><entry> 21 to 25 MIPS</entry></row>
<row><entry>2.2.6</entry><entry>2.1Ghz</entry><entry>Athlon XP with Linux 2.6/g++ 3.4 </entry><entry> 12 to 15 MIPS</entry></row>
</tbody>
</tgroup>
</table>
</section>

<section><title>cpuid</title>
<para>
Example:
<screen>
  cpuid: mmx=1, sep=1, sse=sse4_2, apic=xapic, aes=1, movbe=1, xsave=1
</screen>
This defines features and functionality supported by Bochs emulated CPU:
</para>
<para><command>mmx</command></para>
<para>
Select MMX instruction set support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 5.
</para>
<para><command>apic</command></para>
<para>
Select APIC configuration (LEGACY/XAPIC/X2APIC).
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 5.
</para>
<para><command>sep</command></para>
<para>
Select SYSENTER/SYSEXIT instruction set support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>sse</command></para>
<para>
Select SSE instruction set support.
Any of NONE/SSE/SSE2/SSE3/SSSE3/SSE4_1/SSE4_2 could be selected.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>sse4a</command></para>
<para>
Select AMD SSE4A instructions support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>aes</command></para>
<para>
Select AES instruction set support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>movbe</command></para>
<para>
Select MOVBE Intel(R) Atom instruction support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>xsave</command></para>
<para>
Select XSAVE extensions support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>xsaveopt</command></para>
<para>
Select XSAVEOPT instruction support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>avx</command></para>
<para>
Select AVX/AVX2 instruction set support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>avx_f16c</command></para>
<para>
Select AVX float16 convert instructions support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>avx_fma</command></para>
<para>
Select AVX fused multiply add (FMA) instructions support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>bmi</command></para>
<para>
Select BMI1/BMI2 instructions support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>fma4</command></para>
<para>
Select AMD four operand FMA instructions support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>xop</command></para>
<para>
Select AMD XOP instructions support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>tbm</command></para>
<para>
Select AMD TBM instructions support.
This option exists only if Bochs compiled with --enable-avx option.
</para>
<para><command>x86_64</command></para>
<para>
Enable x86-64 and long mode support.
This option exists only if Bochs compiled with x86-64 support.
</para>
<para><command>1g_pages</command></para>
<para>
Enable 1G page size support in long mode.
This option exists only if Bochs compiled with x86-64 support.
</para>
<para><command>pcid</command></para>
<para>
Enable Process-Context Identifiers (PCID) support in long mode.
This option exists only if Bochs compiled with x86-64 support.
</para>
<para><command>smep</command></para>
<para>
Enable Supervisor Mode Execution Protection (SMEP) support.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
</para>
<para><command>mwait</command></para>
<para>
Select MONITOR/MWAIT instructions support.
This option exists only if Bochs compiled with --enable-monitor-mwait.
</para>
<para><command>mwait_is_nop</command></para>
<para>
When this option is enabled MWAIT will not put the CPU into a sleep state.
This option exists only if Bochs compiled with --enable-monitor-mwait.
</para>
<para><command>vmx</command></para>
<para>
Select VMX extensions emulation support.
This option exists only if Bochs compiled with --enable-vmx option.
</para>
<para><command>family</command></para>
<para>
Set family information returned by CPUID. Default family value determined
by configure option --enable-cpu-level.
</para>
<para><command>model</command></para>
<para>
Set model information returned by CPUID. Default model value is 3.
</para>
<para><command>stepping</command></para>
<para>
Set stepping information returned by CPUID. Default stepping value is 3.
</para>
<para><command>vendor_string</command></para>
<para>
Set the CPUID vendor string returned by CPUID(0x0).  This should be a
twelve-character ASCII string.
</para>
<para><command>brand_string</command></para>
<para>
Set the CPUID brand string returned by CPUID(0x80000002 .. 0x80000004]).  This should be
at most a forty-eight-character ASCII string.
</para>
</section>

<section><title>romimage</title>
<para>
Examples:
<screen>
  romimage: file=bios/BIOS-bochs-latest, address=0xe0000
  romimage: file=$BXSHARE/BIOS-bochs-legacy, address=0xf0000
  romimage: file=mybios.bin, address=0xfff80000
  romimage: file=mybios.bin
</screen>
The ROM BIOS controls what the PC does when it first powers on.  Normally, you
can use a precompiled BIOS in the source or binary distribution called
<filename>BIOS-bochs-latest</filename>. The default ROM BIOS is usually loaded
starting at address 0xe0000, and it is exactly 128k long. The legacy version of
the Bochs BIOS is usually loaded starting at address 0xf0000, and it is exactly
64k long.
You can also use the environment variable $BXSHARE to specify the location of the BIOS.
The usage of external large BIOS images (up to 512k) at memory top is
now supported, but we still recommend to use the BIOS distributed with Bochs.
The start address is optional, since it can be calculated from image size.
</para>
</section>

<section><title>optromimage1, optromimage2, optromimage3 or optromimage4</title>
<para>
Example:
<screen>
   optromimage1: file=optionalrom.bin, address=0xd0000
</screen>

This enables Bochs to load up to 4 optional ROM images.
</para>
<para>
Be sure to use a
read-only area, typically between C8000 and EFFFF. These optional
ROM images should not overwrite the rombios (located at
F0000-FFFFF) and the videobios (located at C0000-C7FFF).
</para>
<para>
Those ROM images will be initialized by the BIOS if they contain
the right signature (0x55AA).
</para>
<para>
It can also be a convenient way to upload some arbitrary code/data
in the simulation, that can be retrieved by the boot loader
</para>
</section>

<section id="bochsopt-vgaromimage"><title>vgaromimage</title>
<para>
Examples:
<screen>
  vgaromimage: file=bios/VGABIOS-elpin-2.40
  vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
  vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest-cirrus
</screen>
This tells Bochs what VGA ROM BIOS to load (at 0xC0000).
</para>
<para>A VGA BIOS from Elpin Systems, Inc. as well as a free LGPL'd VGA BIOS
are provided in the source and binary distributions.</para>
<note><para>
  Please check with the <link linkend="bochsopt-vga">vga option</link> to decide
  what VGA BIOS to use.
</para></note>
</section>

<section id="bochsopt-vga">
<title>vga</title>
<para>
Examples:
<screen>
  vga: extension=cirrus, update_freq=10
  vga: extension=vbe
</screen>
This defines parameters related to the VGA display
</para>
<para>
The 'extension' option can be used to specify the VGA display extension.
With the value 'none' you can use standard VGA with no extension. Other supported
values are 'vbe' for Bochs VBE (needs <filename>VGABIOS-lgpl-latest</filename> as
VGA BIOS, see <link linkend="bochsopt-vgaromimage">vgaromimage option</link>)
and 'cirrus' for Cirrus SVGA support (needs
<filename>VGABIOS-lgpl-latest-cirrus</filename> as VGA BIOS).
</para>
<para>
The VGA update frequency is based on the emulated clock and the default
value is 5. Keep in mind that you must tweak the 'cpu: ips=N' directive
to be as close to the number of emulated instructions-per-second your
workstation can do, for this to be accurate. If the realtime sync is
enabled with the <link linkend="bochsopt-clock">clock option</link>, the value
is based on the real time. This parameter can be changed at runtime.
</para>
</section>

<section id="bochsopt-floppyab"><title>floppya/floppyb</title>
<para>
Examples:
<screen>
2.88M 3.5" media:
  floppya: 2_88=a:, status=inserted
1.44M 3.5" media (write protected):
  floppya: 1_44=floppya.img, status=inserted, write_protected=1
1.2M  5.25" media:
  floppyb: 1_2=/dev/fd0, status=inserted
720K  3.5" media:
  floppya: 720k=/usr/local/bochs/images/win95.img, status=inserted
auto-detect floppy media type:
  floppya: image=floppy.img, status=inserted
use directory as VFAT media:
  floppya: 1_44=vvfat:path, status=inserted
1.44M 3.5" floppy drive, no media:
  floppya: type=1_44
</screen>
Floppya is the first drive, and floppyb is the second drive. If you're booting
from a floppy, floppya should point to a bootable disk.  To read from a disk
image, write the name of the image file.  In many operating systems Bochs can
read directly from a raw floppy drive.  For raw disk access, use the device
name (Unix systems) or the drive letter and a colon (Windows systems).
</para>
<para>
Following floppy media types are supported: 2_88, 1_44, 1_2, 720k, 360k, 320k, 180k,
160k, as well as "image" to let Bochs auto-detect the type of floppy media (does only
work with images, not with raw floppy drives). In that case the size must match
one of the supported types.
</para>
<para>
You can set the initial status of the media to <constant>ejected</constant>
or <constant>inserted</constant>. Usually you will want to use
<constant>inserted</constant>.
</para>
<para>
The parameter 'type' can be used to enable the floppy drive without media
and status specified. Usually the drive type is set up based on the media type.
</para>
<para>
The optional parameter 'write_protected' can be used to control the media
write protect switch. By default it is turned off.
</para>
</section>

<section id="bochsopt-ata"><title>ata0, ata1, ata2, ata3</title>
<para>
Examples:
<screen>
ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
ata2: enabled=1, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
ata3: enabled=1, ioaddr1=0x168, ioaddr2=0x360, irq=9
</screen>

These options enables up to 4 ata channels. For each channel
the two base io addresses and the irq must be specified.
ata0 and ata1 are enabled by default, with the values shown above.

</para>
</section>

<section id="bochsopt-ata-master-slave"><title>ata0-master, ata0-slave, ata1-*, ata2-*, ata3-*</title>
<para>
Examples:
<screen>
ata0-master: type=disk, path=10M.img, mode=flat, cylinders=306, heads=4, spt=17, translation=none
ata1-master: type=disk, path=2GB.cow, mode=vmware3, cylinders=5242, heads=16, spt=50, translation=echs
ata1-slave:  type=disk, path=3GB.img, mode=sparse, cylinders=6541, heads=16, spt=63, translation=auto
ata2-master: type=disk, path=7GB.img, mode=undoable, cylinders=14563, heads=16, spt=63, translation=lba
ata2-slave:  type=cdrom, path=iso.sample, status=inserted
</screen>
</para>

<para>

This defines the type and characteristics of all attached ata devices:
<table>
<title>ata devices configuration options</title>
<tgroup cols="3">
<thead>
<row>
<entry>Option</entry>
<entry>Comments</entry>
<entry>Possible values</entry>
</row>
</thead>
<tbody>
<row> <entry> type </entry> <entry> type of attached device </entry> <entry> [disk | cdrom] </entry> </row>
<row> <entry> path  </entry> <entry> path of the image </entry> </row>
<row>
  <entry> mode  </entry>
  <entry> image type, only valid for disks </entry>
  <entry> [flat | concat | external | dll | sparse | vmware3 | vmware4 | undoable | growing | volatile | vvfat ]</entry>
</row>
<row> <entry> cylinders </entry> <entry> only valid for disks </entry> </row>
<row> <entry> heads </entry> <entry> only valid for disks </entry> </row>
<row> <entry> spt </entry> <entry> only valid for disks </entry> </row>
<row> <entry> status </entry> <entry> only valid for cdroms </entry> <entry> [inserted | ejected] </entry> </row>
<row> <entry> biosdetect </entry> <entry> type of biosdetection </entry> <entry> [none | auto], only for disks on ata0 [cmos] </entry> </row>
<row> <entry> translation </entry> <entry> type of translation done by the BIOS (legacy int13), only for disks </entry> <entry> [none | lba | large | rechs | auto] </entry> </row>
<row> <entry> model </entry> <entry> string returned by identify device ATA command </entry> </row>
<row> <entry> journal </entry> <entry> optional filename of the redolog for undoable, volatile and vvfat disks </entry> </row>
</tbody>
</tgroup>
</table>
</para>

<para>
  You have to tell the type of the attached device. For Bochs 2.0 or later, it can be
  <parameter>disk</parameter> or <parameter>cdrom</parameter>.
</para>

<para>
You have to point the "path" at a hard disk image file, cdrom iso file,
or physical cdrom device.
To create a hard disk image, try running bximage (see
<xref linkend="diskimagehowto">). It will help you choose the size and
then suggest a line that works with it.
</para>

<para>
In Unix it is possible to use a raw device as a Bochs hard disk,
but <emphasis>we don't recommend it</emphasis> for safety reasons. In Windows, there is no easy way.
</para>

<para>
Disk geometry autodetection works with images created by bximage if CHS is set
to 0/0/0 (cylinders are calculated using  heads=16 and spt=63). For other hard
disk images and modes the cylinders, heads, and spt are mandatory. In all cases
the disk size reported from the image must be exactly C*H*S*512. Flat hard disk
images from other projects might store additional information at the end of the
file that makes this check fail. Only in this case it is safe to select "continue"
when Bochs panics.
</para>

<para>
The disk translation scheme
(implemented in legacy int13 BIOS functions, and used by
older operating systems like MS-DOS), can be defined as:
<itemizedlist>
<listitem><para>
none : no translation, for disks up to 528MB (1032192 sectors)
</para></listitem>
<listitem><para>
large : a standard bitshift algorithm, for disks up to 4.2GB (8257536 sectors)
</para></listitem>
<listitem><para>
rechs : a revised bitshift algorithm, using a 15 heads fake physical geometry, for disks up to 7.9GB (15482880 sectors). (don't use this unless you understand what you're doing)
</para></listitem>
<listitem><para>
lba : a standard lba-assisted algorithm, for disks up to 8.4GB (16450560 sectors)
</para></listitem>
<listitem><para>
auto : autoselection of best translation scheme. (it should be changed if system does not boot)
</para></listitem>
</itemizedlist>
Please see <xref linkend="bios-disk-translation"> for a discussion on translation scheme.
</para>

<para>
The mode option defines how the disk image is handled. Disks can be defined as:
<itemizedlist>
<listitem><para>
flat : one file flat layout
</para></listitem>
<listitem><para>
concat : multiple files layout
</para></listitem>
<listitem><para>
external : developer's specific, through a C++ class
</para></listitem>
<listitem><para>
dll : developer's specific, through a DLL
</para></listitem>
<listitem><para>
sparse : stackable, commitable, rollbackable
</para></listitem>
<listitem><para>
vmware3 : vmware version 3 disk support
</para></listitem>
<listitem><para>
vmware4 : vmware version 4 disk support
</para></listitem>
<listitem><para>
undoable : flat file with commitable redolog
</para></listitem>
<listitem><para>
growing : growing file
</para></listitem>
<listitem><para>
volatile : flat file with volatile redolog
</para></listitem>
<listitem><para>
vvfat: local directory appears as VFAT disk (with volatile redolog / optional commit)
</para></listitem>
</itemizedlist>
Please see <xref linkend="harddisk-modes"> for a discussion on disk modes.
</para>

<para>
Default values are:
<screen>
   mode=flat, biosdetect=auto, translation=auto, model="Generic 1234"
</screen>
</para>

<para>
  The <parameter>biosdetect</parameter> option has currently no effect on the BIOS.
</para>

<note><para>
  Make sure the proper <link linkend="bochsopt-ata">ata option</link> is enabled when
  using a device on that ata channel.
</para></note>
</section>

<section id="bochsopt-boot"><title>boot</title>
<para>
Examples:
<screen>
  boot: floppy
  boot: cdrom, disk
  boot: network, disk
  boot: cdrom, floppy, disk
</screen>
This defines the boot sequence. You can specify up to 3 boot drives,
which can be 'floppy', 'disk', 'cdrom' or 'network' (boot ROM).
Legacy 'a' and 'c' are also supported.
</para>
</section>

<section><title>floppy_bootsig_check</title>
<para>
Example:
<screen>
  floppy_bootsig_check: disabled=1
</screen>
This disables the 0xaa55 signature check on boot floppies
The check is enabled by default.
</para>
</section>

<section id="bochsopt-configinterface"><title>config_interface</title>
<para>
The configuration interface is a series of menus or dialog boxes that
allows you to edit all the settings that control Bochs' behavior.
Depending on the platform there are up to 3 choices of configuration
interface: a text mode version called "textconfig" and two graphical versions
called "win32config" and "wx".  The text mode version uses stdin/stdout and
is always compiled in, unless Bochs is compiled for wx only. The choice
"win32config" is only available on win32 and it is the default there.
The choice "wx" is only available when Bochs is compiled with wxWidgets support,
see <xref linkend="compile-wx">. If you do not write a config_interface line,
Bochs will choose a default for you (usually textconfig).
</para>

<note><para>
wxWidgets provides both a configuration interface and a display library.
So if you use the "wx" configuration interface, you must also use
the "wx" display library, see
<link linkend="bochsopt-displaylibrary">display_library option</link>.
</para></note>

<para>
Examples:
<screen>
  config_interface: textconfig
  config_interface: win32config
  config_interface: wx
</screen>
</para>
</section>

<section id="bochsopt-displaylibrary"><title>display_library</title>
<para>
The display library is the code that displays the Bochs VGA screen.  Bochs
has a selection of about 10 different display library implementations for
different platforms.  If you run configure with multiple --with-* options,
the display_library option lets you choose which one you want to run with.
If you do not use a display_library line, Bochs will choose a default for
you.
</para>

<note><para>
wxWidgets provides both a configuration interface and a display library.
So if you use the "wx" display library, you must also use
the "wx" configuration interface, see
<link linkend="bochsopt-configinterface">config_interface option</link>.
</para></note>

<para>
Examples:
<screen>
  display_library: x
  display_library: sdl
</screen>
Some display libraries now support specific option to control their
behaviour. See the examples below for currently supported options.
<screen>
  display_library: rfb, options="timeout=60"  # time to wait for client
  display_library: sdl, options="fullscreen"  # startup in fullscreen mode
  display_library: win32, options="gui_debug" # use win32 debugger gui frontend
  display_library: x, options="hideIPS"       # disable IPS output in status bar
  display_library: x, options="gui_debug"     # use GTK debugger gui frontend
  display_library: x, options="nokeyrepeat"   # turn off host keyboard repeat
</screen>
</para>

<table>
<title>display_library values</title>
<tgroup cols="2">
<thead>
<row>
  <entry>Option</entry>
  <entry>Description</entry>
</row>
</thead>
<tbody>
<row>
  <entry>x</entry>
  <entry>use X windows interface, cross platform</entry>
</row>
<row>
  <entry>win32</entry>
  <entry>use native win32 libraries</entry>
</row>
<row>
  <entry>carbon</entry>
  <entry>use Carbon library (for MacOS X)</entry>
</row>
<row>
  <entry>macintosh</entry>
  <entry>use MacOS pre-10</entry>
</row>
<row>
  <entry>amigaos</entry>
  <entry>use native AmigaOS libraries</entry>
</row>
<row>
  <entry>sdl</entry>
  <entry>use SDL library, cross platform,
    details in <xref linkend="compile-sdl"></entry>
</row>
<row>
  <entry>svga</entry>
  <entry>use SVGALIB library for Linux, allows graphics without X windows</entry>
</row>
<row>
  <entry>term</entry>
  <entry>text only, uses curses/ncurses library, cross platform</entry>
</row>
<row>
  <entry>rfb</entry>
  <entry>provides an interface to AT&amp;T's VNC viewer, cross platform,
    details in <xref linkend="compile-rfb"></entry>
</row>
<row>
  <entry>wx</entry>
  <entry>use wxWidgets library, cross platform,
    details in <xref linkend="compile-wx"></entry>
</row>
<row>
  <entry>nogui</entry>
  <entry>no display at all</entry>
</row>
</tbody>
</tgroup>
</table>
</section>

<section id="bochsopt-log"><title>log</title>
<para>
Examples:
<screen>
  log: bochsout.txt
  log: -
  log: /dev/tty               (Unix only)
  log: /dev/null              (Unix only)
  log: nul                    (win32 only)
</screen>
Give the path of the log file you'd like Bochs debug and misc. verbiage to be
to be written to. If you don't use this option or set the filename to '-'
the output is written to the console. If you really don't want it,
make it "/dev/null" (Unix) or "nul" (win32). :^(
</para>
</section>

<section><title>logprefix</title>
<para>
Examples:
<screen>
   logprefix: %t-%e-@%i-%d
   logprefix: %i%e%d
</screen>
This handles the format of the string prepended to each log line.
You may use those special tokens :
  <screen>
  %t : 11 decimal digits timer tick
  %i : 8 hexadecimal digits of current cpu eip (ignored in SMP configuration)
  %e : 1 character event type ('i'nfo, 'd'ebug, 'p'anic, 'e'rror)
  %d : 5 characters string of the device, between brackets
  </screen>
</para>
<para>
Default is %t%e%d
</para>
</section>

<section id="bochsopt-debug-info-error-panic"><title>debug/info/error/panic</title>
<para>
Examples:
<screen>
  debug: action=ignore
  info: action=report
  error: action=report
  panic: action=ask
</screen>

During simulation, Bochs encounters certain events that the user might want to
know about.  These events are divided into four levels of importance: debug,
info, error, and panic.  Debug messages are usually only useful when writing
Bochs code or when trying to locate a problem.  There may be thousands of debug
messages per second, so be careful before turning them on.  Info messages tell
about interesting events that don't happen that frequently.  Bochs produces an
"error" message when it  finds a condition that really shouldn't happen,  but
doesn't endanger the simulation.  An example of an error  might be  if the
emulated  software produces an illegal disk command.  Panic messages mean that
Bochs cannot simulate correctly and should probably shut down.
A panic can be a configuration problem (like a misspelled bochsrc line) or an
emulation problem (like an unsupported video mode).
</para>


<para>
The debug, info, error, and panic lines in the bochsrc control what Bochs will
do when it encounters each type of event.  The allowed actions are: fatal
(terminate bochs), ask (ask the user what to do), report (print information to
the console or log file), or ignore (do nothing).  The recommended settings are
listed in the sample above.
</para>

<tip>
<para>
The safest action for panics is "fatal" or "ask".  If you are getting lots of
panics and get tired of telling it to continue each time, you can try
action=report instead.  If you allow Bochs to continue after a panic, don't
be surprised if you get strange behavior or crashes after a panic occurs.
Please report panic messages to the bochs-developers mailing list unless it is
just a configuration problem like "could not find hard drive image."
</para>
</tip>
</section>

<section><title>debugger_log</title>
<para>
Examples:
<screen>
  debugger_log: debugger.out
  debugger_log: /dev/null              (Unix only)
  debugger_log: -
</screen>
Give the path of the log file you'd like Bochs to log debugger output.
If you really don't want it, make it '/dev/null', or '-'.
</para>
</section>

<section id="bochsopt-com">
<title>com[1-4]</title>
<para>
Examples:
<screen>
  com1: enabled=1, mode=null
  com1: enabled=1, mode=mouse
  com1: enabled=1, mode=term, dev=/dev/ttyp9
  com2: enabled=1, mode=file, dev=serial.out
  com3: enabled=1, mode=raw, dev=com1
  com3: enabled=1, mode=socket-client, dev=localhost:8888
  com3: enabled=1, mode=socket-server, dev=localhost:8888
  com4: enabled=1, mode=pipe-client, dev=\\.\pipe\mypipe
  com4: enabled=1, mode=pipe-server, dev=\\.\pipe\mypipe
</screen>
  This defines a serial port (UART type 16550A).
</para>
<para>
  When using the mode 'term', you can specify a device to use as com1.
  This can be a real serial line, or a pty.  To use a pty (under X/Unix),
  create two windows (xterms, usually).  One of them will run Bochs, and
  the other will act as com1. Find out the tty of the com1 window using
  the `tty' command, and use that as the `dev' parameter.  Then do
  `sleep 1000000' in the com1 window to keep the shell from messing with
  things, and run Bochs in the other window. Serial I/O to com1 (port 0x3f8)
  will all go to the other window.
</para>
<para>
  When using socket* and pipe* (win32 only) modes Bochs becomes either
  socket/named pipe client or server. In client mode it connects to an already
  running server (if connection fails Bochs treats com port as not connected).
  In server mode it opens socket/named pipe and waits until a client application
  connects to it before starting simulation. This mode is useful for remote
  debugging (e.g. with gdb's "target remote host:port" command or windbg's command
  line option -k com:pipe,port=\\.\pipe\pipename).

  Note: 'socket' is a shorthand for 'socket-client', 'pipe' for 'pipe-client'.
  Socket modes use simple TCP communication, pipe modes use duplex byte mode pipes.
</para>
<para>
  Other serial modes are 'null' (no input/output), 'file' (output to a file
  specified as the 'dev' parameter), 'raw' (use the real serial port - under
  construction for win32), 'mouse' (standard serial mouse - requires
  <link linkend="bochsopt-mouse">mouse option</link> setting 'type=serial'
  or 'type=serial_wheel').
</para>
</section>

<section>
<title>parport[1-2]</title>
<para>
Examples:
<screen>
  parport1: enabled=1, file="parport.out"
  parport2: enabled=1, file="/dev/lp0"
  parport1: enabled=0
</screen>
This defines a parallel (printer) port. When turned on and an output file is
defined, the emulated printer port sends characters printed by the guest OS
into the output file. On some platforms, a device filename can be used to
send the data to the real parallel port (e.g. "/dev/lp0" on Linux, "lpt1" on
win32 platforms).
</para>
</section>

<section id="sb16line"><title>sb16</title>
<para>
Example:
<screen>
  sb16: midimode=1, midi=/dev/midi00, wavemode=1, wave=/dev/dsp,
        loglevel=2, log=sb16.log, dmatimer=600000
</screen>
<note><para>
The example is wrapped onto several lines for formatting reasons, but it
should all be on one line in the actual <filename>bochsrc</filename> file.
</para></note>

This defines the Sound Blaster 16 emulation, see <xref linkend="sb16-emulation">
for more information. It can have several of the following properties. All properties
are in the usual "property=value" format.

 <itemizedlist>
   <listitem><para>
   midi: The filename is where the midi data is sent to. This
   can be a device or just a file if you want to record the midi data.
   On a Windows host this parameter is ignored when using output to the sound
   device. On a Linux host with ALSA present and this parameter starting with
   "alsa:", the default sequencer device will be used with the given client
   and port parameters instead of an OSS device.
   </para></listitem>

   <listitem><para>
   midimode:
   <screen>
   0 = No data should be output.
   1 = output to device (system dependent - midi denotes the device driver).
   2 = SMF file output, including headers.
   3 = Output the midi data stream to the file (no midi headers and no
       delta times, just command and data bytes).
   </screen>
   </para></listitem>

   <listitem><para>
   wave: This is the device/file where wave output is stored.
   On a Windows host this parameter is ignored when using output to the sound
   device. On a Linux host with ALSA present and this parameter set to "alsa",
   the default PCM output device will be used instead of an OSS device.
   </para></listitem>

   <listitem><para>
   wavemode:
   <screen>
   0 = no data
   1 = output to device (system dependent - wave denotes the device driver).
   2 = VOC file output, including headers.
   3 = Output the raw wave stream to the file.
   </screen>
   </para></listitem>

   <listitem><para>
   log: The file to write the sb16 emulator messages to.
   </para></listitem>

   <listitem><para>
   loglevel:
   <screen>
   0 = No log.
   1 = Resource changes, midi program and bank changes.
   2 = Severe errors.
   3 = All errors.
   4 = All errors plus all port accesses.
   5 = All errors and port accesses plus a lot of extra information.
   </screen>
   It is possible to change the loglevel at runtime.
   </para></listitem>

   <listitem><para>
   dmatimer: Microseconds per second for a DMA cycle. Make it smaller to fix
   non-continuous sound. 750000 is usually a good value. This needs a reasonably
   correct setting for the <command>ips</command> parameter of the
   <link linkend="bochsopt-cpu">cpu option</link>. It is possible to adjust the
   dmatimer value at runtime.
   </para></listitem>
 </itemizedlist>
</para>
</section>

<section><title>es1370</title>
<para>
Examples:
<screen>
  es1370: enabled=1, wavedev=""    # win32
  es1370: enabled=1, wavedev=alsa  # Linux with ALSA
</screen>
This defines the ES1370 sound emulation. The parameter 'enabled' controls the
presence of the device. In addition to this, it must be assigned to a PCI
slot. The 'wavedev' parameter is similar to the 'wave' parameter of the SB16
soundcard. The emulation supports recording and playback (except DAC1+DAC2
output at the same time).
</para>
</section>

<section><title>keyboard_serial_delay</title>
<para>
Example:
<screen>
  keyboard_serial_delay: 250 # default
</screen>
Approximate time in microseconds that it takes one character to be
transferred from the keyboard to controller over the serial path.
</para>
</section>

<section><title>keyboard_paste_delay</title>
<para>
Example:
<screen>
  keyboard_paste_delay: 100000 # default
</screen>
Approximate time in microseconds between attempts to paste
characters to the keyboard controller. This leaves time for the
guest os to deal with the flow of characters.  The ideal setting
depends on how your operating system processes characters.  The
default of 100000 usec (.1 seconds) was chosen because it works
consistently in Windows.
</para>
</section>

<section id="bochsopt-clock"><title>clock</title>
<para>
This defines the parameters of the clock inside Bochs:
</para>
<para><command>sync</command></para>
<para>
This defines the method how to synchronize the Bochs internal time
with realtime. With the value 'none' the Bochs time relies on the IPS
value and no host time synchronization is used. The 'slowdown' method
sacrifices performance to preserve reproducibility while allowing host
time correlation. The 'realtime' method sacrifices reproducibility to
preserve performance and host-time correlation.
It is possible to enable both synchronization methods.
</para>
<para><command>time0</command></para>
<para>
Specifies the start (boot) time of the virtual machine. Use a time
value as returned by the time(2) system call. If no time0 value is
set or if time0 equal to 1 (special case) or if time0 equal 'local',
the simulation will be started at the current local host time.
If time0 equal to 2 (special case) or if time0 equal 'utc',
the simulation will be started at the current utc time.
</para>
<para>
<screen>
Syntax:
  clock: sync=[none|slowdown|realtime|both], time0=[timeValue|local|utc]

Examples:
  clock: sync=none,     time0=local       # Now (localtime)
  clock: sync=slowdown, time0=315529200   # Tue Jan  1 00:00:00 1980
  clock: sync=none,     time0=631148400   # Mon Jan  1 00:00:00 1990
  clock: sync=realtime, time0=938581955   # Wed Sep 29 07:12:35 1999
  clock: sync=realtime, time0=946681200   # Sat Jan  1 00:00:00 2000
  clock: sync=none,     time0=1           # Now (localtime)
  clock: sync=none,     time0=utc         # Now (utc/gmt)

Default value are sync=none, time0=local
</screen>
</para>

</section>

<section id="bochsopt-mouse">
<title>mouse</title>
<para>
Examples:
<screen>
  mouse: enabled=1
  mouse: type=imps2, enabled=1
  mouse: type=serial, enabled=1
  mouse: enabled=0, toggle=ctrl+f10
</screen>
This defines parameters for the emulated mouse type, the initial status
of the mouse capture and the runtime method to toggle it.
</para>
<para><command>type</command></para>
<para>
With the mouse type option you can select the type of mouse to emulate.
The default value is 'ps2'. The other choices are 'imps2' (wheel mouse
on PS/2), 'serial', 'serial_wheel' and 'serial_msys' (one com port requires
setting 'mode=mouse', see <link linkend="bochsopt-com">com option</link>).
To connect a mouse to an USB port, see the <link linkend="bochsopt-usb-uhci">usb_uhci</link>
or 'usb_ohci' option (requires PCI and USB support).
</para>
<para><command>enabled</command></para>
<para>
The Bochs gui creates mouse "events" unless the 'enabled' option is
set to 0. The hardware emulation itself is not disabled by this.
Unless you have a particular reason for enabling the mouse by default,
it is recommended that you leave it off. You can also toggle the
mouse usage at runtime (see <link linkend="headerbar">headerbar</link>
and the 'toggle' option below).
</para>
<para><command>toggle</command></para>
<para>
The default method to toggle the mouse capture at runtime is to press the
CTRL key and the middle mouse button ('ctrl+mbutton'). This option allows
to change the method to 'ctrl+f10' (like DOSBox) or 'ctrl+alt' (like QEMU)
or 'f12' (replaces win32 'legacyF12' option).
</para>
</section>

<section id="bochsopt-private-colormap"><title>private_colormap</title>
<para>
Example:
<screen>
  private_colormap: enabled=1
</screen>
Requests that the GUI creates and uses its own non-shared colormap. This
colormap will be used when in the Bochs window. If not enabled, a shared
colormap scheme may be used. Once again, <varname>enabled=1</varname>
turns on this feature and 0 turns it off.
</para>
</section>

<section><title>pci</title>
<para>
Examples:
<screen>
  pci: enabled=1, chipset=i440fx # default if compiled with PCI support
  pci: enabled=1, chipset=i440fx, slot1=pcivga, slot2=ne2k
</screen>
This option controls the presence of a PCI chipset in Bochs. Currently it only
supports the i440FX chipset. You can also specify the devices connected to
PCI slots. Up to 5 slots are available. These devices are currently supported:
cirrus, es1370, ne2k, pcivga, pcidev, pcipnic, usb_ohci and usb_xhci.
</para>
</section>

<section><title>pcidev</title>
<para>
Example:
<screen>
  pcidev: vendor=0xbabe, device=0x2bad
</screen>
Enables the mapping of a host PCI hardware device within the virtual PCI
subsystem of the Bochs x86 emulator. The arguments
<varname>vendor</varname> and <varname>device</varname>
should contain the PCI vendor ID respectively the PCI
device ID of the host PCI device you want to map within Bochs.
</para>
<note>
<para>
The PCI device mapping is still in a very early stage of development and thus it is very experimental.
This feature requires Linux as a host operating system.
</para>
</note>
<para>
Besides the <varname>pcidev</varname> config line you will need to load
a pcidev kernel module within your Linux host OS. This kernel module is
located in the <constant>bochs/host/linux/pcidev/</constant> directory.
</para>
</section>

<section id="bochsopt-usb-uhci"><title>usb_uhci</title>
<para>
Examples:
<screen>
  usb_uhci: enabled=1, port1=mouse, port2=disk:usbstick.img
  usb_uhci: enabled=1, port1=hub:7, port2=disk:growing:usbdisk.img
  usb_uhci: enabled=1, port2=disk:undoable:usbdisk.img, options1=journal:redo.log
  usb_uhci: enabled=1, port1=printer:printdata.bin, port2=cdrom:image.iso
</screen>
This option controls the presence of the USB root hub which is a part of the
i440FX PCI chipset.
</para>
<para>
With the port<replaceable>X</replaceable> option you can connect devices
to the hub (currently supported: 'mouse', 'tablet', 'keypad', 'disk', 'cdrom',
'hub' and 'printer').
</para>
<para>
The options<replaceable>X</replaceable> parameter can be used to assign specific
options to the device connected to the corresponding USB port. Currently this
feature is only used to set the speed reported by device and by the 'disk'
device to specify an alternative redolog file of some image modes.
</para>
<para>
If you connect the mouse or tablet to one of the ports, Bochs forwards the
mouse movement data to the USB device instead of the selected mouse type.
When connecting the keypad to one of the ports, Bochs forwards the input of
the numeric keypad to the USB device instead of the PS/2 keyboard.
</para>
<para>
To connect a 'flat' mode image as an USB hardisk you can use the 'disk' device
with the path to the image separated with a colon. To use other disk image modes
similar to ATA disks the syntax 'disk:mode:filename' must be used (see above).
</para>
<para>
To emulate an USB cdrom you can use the 'cdrom' device name and the path to
an ISO image or raw device name also separated with a colon. An option to
insert/eject media is available in the runtime configuration.
</para>
<para>
The device name 'hub' connects an external hub with max. 8 ports (default: 4)
to the root hub. To specify the number of ports you have to add the value
separated with a colon. Connecting devices to the external hub ports is only
available in the runtime configuration.
</para>
<para>
The device 'printer' emulates the HP Deskjet 920C printer. The PCL data is
sent to a file specified in bochsrc.txt. The current code appends the PCL
code to the file if the file already existed. It would probably be nice to
overwrite the file instead, asking user first.
</para>
<note><para>
PCI support must be enabled.
</para></note>
</section>

<section id="bochsopt-usb-ohci"><title>usb_ohci</title>
<para>
Example:
<screen>
  usb_ohci: enabled=1
</screen>
This option controls the presence of the USB OHCI host controller with a
2-port hub. The portX option accepts the same device types with the same
syntax as the UHCI controller (see the <link linkend="bochsopt-usb-uhci">usb_uhci option</link>).
The OHCI HC must be assigned to a PCI slot.
</para>
</section>

<section id="bochsopt-gdbstub">
<title>gdbstub</title>
<para>
Example:
<screen>
  gdbstub: enabled=1, port=1234, text_base=0, data_base=0, bss_base=0
</screen>
Default:
<screen>
  gdbstub: enabled=0
</screen>
This enables the GDB stub. See <xref linkend="debugging-with-gdb">.
</para>
</section>

<section><title>ne2k</title>
<para>
The ne2k line configures an emulated NE2000-compatible Ethernet adapter,
which allows the guest machine to communicate on the network.  To disable
the NE2000 just comment out the ne2k line.
</para>
<para>
Examples:
<screen>
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xl0
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=en0 #macosx
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:01, ethmod=win32, ethdev=<replaceable>MYCARD</replaceable>
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:01, ethmod=vde, ethdev="/tmp/vde.ctl"
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:01, ethmod=vnet, ethdev="c:/temp"
ne2k: ioaddr=0x300, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
ne2k: ioaddr=0x300, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun0, script=./tunconfig
ne2k: mac=fe:fd:00:00:00:01, ethmod=slirp, script=/usr/local/bin/slirp

ioaddr, irq: You probably won't need to change ioaddr and irq, unless there
are IRQ conflicts. These parameters are ignored if the NE2000 is assigned to
a PCI slot.

mac: The MAC address MUST NOT match the address of any machine on the net.
Also, the first byte must be an even number (bit 0 set means a multicast
address), and you cannot use ff:ff:ff:ff:ff:ff because that's the broadcast
address.  For the ethertap module, you must use fe:fd:00:00:00:01.  There may
be other restrictions too.  To be safe, just use the b0:c4... address.

ethmod: The ethmod value defines which low level OS specific module to be
used to access physical ethernet interface. You can also specify a network
simulator or a module with no input/output ("null"). See the table below for
currently supported values.

ethdev: The ethdev value is the name of the network interface on your host
platform.  On UNIX machines, you can get the name by running ifconfig.  On
Windows machines, you must run niclist to get the name of the ethdev.
Niclist source code is in misc/niclist.c and it is included in Windows
binary releases.

script: The script value is optional, and is the name of a script that
is executed after bochs initialize the network interface. You can use
this script to configure this network interface, or enable masquerading.
This is mainly useful for the tun/tap devices that only exist during
Bochs execution. The network interface name is supplied to the script
as first parameter
</screen>
</para>

<para>
The following table shows the available ethernet modules with description,
whether the "ethdev" and "script" parameters are used or not and the Bochs
version where this module was added.
</para>
<table><title>Ethernet modules</title>
<tgroup cols="5" align="left" colsep="1" rowsep="1">
<thead>
  <row>
    <entry>Module</entry>
    <entry>Description</entry>
    <entry>ethdev</entry>
    <entry>script</entry>
    <entry>Bochs version</entry>
  </row>
</thead>
<tbody>
  <row>
    <entry>fbsd</entry>
    <entry>FreeBSD / OpenBSD packetmover.
    </entry>
    <entry>Yes</entry>
    <entry>No</entry>
    <entry>1.0</entry>
  </row>
  <row>
    <entry>linux</entry>
    <entry>Linux packetmover - 'root' privileges required,
    no connection to the host machine.
    </entry>
    <entry>Yes</entry>
    <entry>No</entry>
    <entry>1.3</entry>
  </row>
  <row>
    <entry>null</entry>
    <entry>Null packetmover. All packets are discarded, but logged to a
    few files.
    </entry>
    <entry>No</entry>
    <entry>No</entry>
    <entry>1.0</entry>
  </row>
  <row>
    <entry>tap</entry>
    <entry>TAP packetmover.
    </entry>
    <entry>Yes</entry>
    <entry>Yes</entry>
    <entry>1.4</entry>
  </row>
  <row>
    <entry>tuntap</entry>
    <entry>TUN/TAP packetmover - see <link linkend="config-tuntap">
    Configuring and using a tuntap network interface</link>.
    </entry>
    <entry>Yes</entry>
    <entry>Yes</entry>
    <entry>2.0</entry>
  </row>
  <row>
    <entry>vde</entry>
    <entry>Virtual Distributed Ethernet packetmover.
    </entry>
    <entry>Yes</entry>
    <entry>Yes</entry>
    <entry>2.2</entry>
  </row>
  <row>
    <entry>vnet</entry>
    <entry>ARP, ping (ICMP-echo), DHCP and read/write TFTP simulation. The virtual
    host uses 192.168.10.1. DHCP assigns 192.168.10.2 to the guest. The TFTP server
    uses the ethdev value for the root directory and doesn't overwrite files.
    </entry>
    <entry>Yes, for TFTP</entry>
    <entry>No</entry>
    <entry>2.2</entry>
  </row>
  <row>
    <entry>slirp</entry>
    <entry>Ethernet backend for Slirp and a builtin DHCP server. Adds user mode
    networking to Bochs using Slirp. Only tested with the most recent Slirp
    version with Debian patches applied. The fullbolt Slirp version should be
    used. The "script" parameter should point to the Slirp binary.
    </entry>
    <entry>No</entry>
    <entry>Yes</entry>
    <entry>2.2</entry>
  </row>
  <row>
    <entry>win32</entry>
    <entry>Win32 packetmover - WinPCap driver required.
    </entry>
    <entry>Yes</entry>
    <entry>No</entry>
    <entry>1.3</entry>
  </row>
</tbody>
</tgroup>
</table>
</section>

<section><title>pnic</title>
<para>
Example:
<screen>
  pnic: enabled=1, mac=b0:c4:20:00:00:00, ethmod=vnet
</screen>
To support the Bochs/Etherboot pseudo-NIC, Bochs must be compiled with the
--enable-pnic configure option. It accepts the same syntax (for mac, ethmod,
ethdev, script) and supports the same networking modules as the NE2000 adapter.
In addition to this, it must be assigned to a PCI slot.
</para>
</section>

<section><title>keyboard_mapping</title>
<para>
Examples:
<screen>
  keyboard_mapping: enabled=0, map=
  keyboard_mapping: enabled=1, map=gui/keymaps/x11-pc-de.map
</screen>
This enables a remap of a physical localized keyboard to a
virtualized U.S. keyboard, as the PC architecture expects.
If enabled, the keymap file must be specified. Keyboard mapping is
available for X windows, SDL (Linux port) and wxWidgets (GTK port).
For SDL you have to use keymaps designed for SDL, the wxWidgets GUI
uses the keymaps for X windows.
</para>
</section>

<section><title>keyboard_type</title>
<para>
Examples:
<screen>
  keyboard_type: xt
  keyboard_type: at
  keyboard_type: mf
</screen>
Type of keyboard returned by a "identify keyboard" command to the
keyboard controller. It must be one of "xt", "at" or "mf".
Defaults to "mf". It should be ok for almost everybody. A known
exception is French macs, that do have a "at"-like keyboard.
</para>
</section>

<section id="bochsopt-user-shortcut"><title>user_shortcut</title>
<para>
Examples:
<screen>
  user_shortcut: keys=ctrl-alt-del
  user_shortcut: keys=ctrl-alt-esc
</screen>
This defines the keyboard shortcut to be sent when you press the "user" button
in the <link linkend="headerbar">headerbar</link>. The shortcut string is a
combination of maximum 3 key names (listed below) separated with a '-' character.
</para>
<para>
Valid key names:
</para>
<para>
"alt", "bksl", "bksp", "ctrl", "del", "down", "end", "enter", "esc",
"f1", ... "f12", "home", "ins", "left", "menu", "minus", "pgdwn", "pgup", "plus",
"right", "shift", "space", "tab", "up", "win", "print" and "power".
</para>
</section>

<section><title>cmosimage</title>
<para>
Example:
<screen>
  cmosimage: file=cmos.img, rtc_init=time0
</screen>
This defines image file that can be loaded into the CMOS RAM at startup.
The rtc_init parameter controls whether initialize the RTC with values stored
in the image. By default the time0 argument given to the
<link linkend="bochsopt-clock">clock option</link> is used. With 'rtc_init=image'
the image is the source for the initial time.
</para>
</section>

<section><title>plugin_ctrl</title>
<para>
Example:
<screen>
  plugin_ctrl: biosdev=0, speaker=0
</screen>
Controls the presence of optional plugins without a separate option.
By default all existing plugins are enabled. These plugins are currently
supported: 'acpi', 'biosdev', 'extfpuirq', 'gameport', 'iodebug',
'pci_ide', 'speaker' and 'unmapped'.
</para>
</section>

<section><title>user_plugin</title>
<para>
Example:
<screen>
  user_plugin: name=testdev
</screen>
Load user-defined plugin. This option is available only if Bochs is
compiled with plugin support. Maximum 8 different plugins are supported.
See the example in the Bochs sources how to write a plugin device.
</para>
</section>

<section><title>magic_break</title>
<para>
Example:
<screen>
  magic_break: enabled=1
</screen>
This enables the "magic breakpoint" feature when using the debugger.
The useless cpu instruction XCHG BX, BX causes Bochs to enter the
debugger mode. This might be useful for software development.
</para>
</section>

<section><title>port_e9_hack</title>
<para>
Example:
<screen>
  port_e9_hack: enabled=1
</screen>
The 0xE9 port doesn't exists in normal ISA architecture. However, we
define a convention here, to display on the console of the system running
Bochs anything that is written to it. The idea is to provide debug output
very early when writing BIOS or OS code for example, without having to
bother with setting up a serial port or etc. Reading from port 0xE9 will
will return 0xe9 to let you know if the feature is available. Leave  
this 0 unless you have a reason to use it.
</para>
</section>

<section><title>debug_symbols</title>
<para>
Example:
<screen>
  debug_symbols: file=mysymbols.sym
  debug_symbols: file=mysymbols.sym, offset=0x1000
</screen>
This loads symbols from the specified file for use in Bochs' internal debugger.
Symbols are loaded into global context. This is equivalent to issuing ldsym
debugger command at start up.
</para>
</section>

</section> <!--end of bochsrc section-->

<section id="sb16-emulation"> <!-- start of SB16 section-->

<title>Sound Blaster 16 Emulation</title>

<para>
This section is a detailed description for configuring Sound Blaster 16 from
source. If you have a binary and all you want to know is what to put in your
<filename>bochsrc</filename> file, see <link linkend="sb16line">sb16 option</link>.
</para>

<para>
The original version of the Sound Blaster 16 (SB16) emulation for Bochs was
written and donated by Josef Drexler. The entire set of his SB16 patches have
been integrated into Bochs, however, so you can find everything you need here.
</para>

<section><title>How well does it work?</title>
<para>
Right now, MPU401 emulation is next to perfect. It supports UART
and SBMIDI mode, because the SB16's MPU401 ports can't do anything else as well.
</para>

<para>
The digital audio basically works, but the emulation is too slow for fluent
output unless the application doesn't do much in the background (or the
foreground, really). The sound tends to looping or crackle on slower
computer, but the emulation appears to be correct. Even a MOD
player works, although only for lower sampling speeds.
</para>
<para>
Also, the MIDI data running through the MPU401 ports can be written
into a SMF, that is the standard midi file. The wave output
can be written into a VOC file, which has a format defined by
Creative Labs. This file format can be converted to WAV by
sox for example.
</para>
</section>

<section><title>Output to a sound card</title>

<para>
Output is supported on Windows, Linux, FreeBSD, MacOS 9 and MacOSX at the moment.
</para>
<para>
On Linux, the output goes to any file or device. If you have a wavetable synthesizer,
midi can go to <filename class="devicefile">/dev/midi00</filename>, otherwise you may need
a midi interpreter. For example, the midid program from the DosEmu project would work.
Wave output should go to <filename class="devicefile">/dev/dsp</filename>. These devices
are assumed to be OSS devices, if they're not some of the ioctl's might fail.
If ALSA is present on Linux and the wave device is set to <filename>alsa</filename>,
Bochs uses it's default PCM output device instead of an OSS device.
</para>
<para>
On Windows, midi and (wave) output go to the midi mapper and the wave mapper,
respectively. A future version might have selectable output devices.
</para>
</section>

<section><title>Installation on Linux</title>

<section><title>Prerequisites</title>

<para>
A wavetable synthesizer on <filename class="devicefile">/dev/midi00</filename>
and a working <filename class="devicefile">/dev/dsp</filename> if you want real
time music and sound, otherwise output to midi and wave files is also possible.
Optionally, you can use a software midi interpreter, such as the midid program
from the DosEmu project instead of <filename class="devicefile">/dev/midi00</filename>.
</para>
</section>

<section><title>Configuring Bochs</title>

<para>
You need to <command>configure</command> Bochs using the <option>--enable-sb16</option>
option.
There are a few values in <filename>config.h</filename> that are relevant to the sound functions.
Edit <filename>config.h</filename> after running configure, but before compiling.
</para>

<para>
BX_USE_SB16_SMF should be 1 unless you intend to have several sound cards
running at the same time.
</para>

<para>
BX_SOUND_OUTPUT_C is the name of the class used for output.  The default is
to have no output functions, so you need to change this if you want any sound.
The following are supported at the moment:
</para>

<programlisting>
        bx_sound_linux_c    for output to /dev/dsp and /dev/midi00 on Linux,
                            FreeBSD and maybe other OSes that use the OSS driver.
        bx_sound_windows_c  for output to the midi and wave mapper of
                            Windows 3.1 and higher.
        bx_sound_output_c   for no output at all.
</programlisting>

<para>
Setup the SB16 emulation in your <filename>bochsrc</filename>, according to instructions
in that file (see <link linkend="sb16line">sb16 option</link>).
</para>
</section>

<section><title>Runtime configuration</title>

<para>
The source for the SB16CTRL program that is used to modify
the runtime behavior of the SB16 emulation is included in
<filename class="directory">misc/sb16/</filename>. It is a C
program that can be run from inside the emulation.
</para>

<para>
It currently supports the following commands:
</para>

<table><title>Supported options for <command>sb16ctl</command></title>
<tgroup cols="2">
  <thead>
    <row>
      <entry>Option</entry>
      <entry>Description</entry>
   </row>
  </thead>
  <tbody>
    <row>
      <entry><option>-i <replaceable>number</replaceable></option></entry>
      <entry>
        Show the selected emulator info string,
        e.g. <command>sb16ctrl -i 3</command> to show how many patch translations are active.
      </entry>
    </row>
    <row>
      <entry><option>-t <replaceable>six numbers</replaceable></option></entry>
      <entry>
        Load a translation into the translation table. The numbers are:
        "OldBankMSB,OldBankLSB,OldProgram,NewBankMSB,NewBankLSB,NewProgram".
        All values can be 0..127 or 255. 255 for "Old" values means <emphasis>match
        any</emphasis> and for "New" values means <emphasis>don't change</emphasis>,
        e.g. <command>sb16ctrl -t 255,255,0,255,255,32</command>
        to change patch 0 (Piano) to patch 32 (Acoustic Bass).
      </entry>
    </row>
    <row>
      <entry><option>-r</option></entry>
      <entry>
        Reset the patch translation table e.g. <command>sb16ctrl -r</command>.
      </entry>
    </row>
    <row>
      <entry><option>-m <replaceable>some numbers</replaceable></option></entry>
      <entry>
        Upload the given numbers to the midi output device. Note
        that it should be a complete midi message, and also that it is
        subject to patch translation,
        e.g. <command>sb16ctrl -m 0x80,64,0</command>
        to send a note-off message to channel 0.
      </entry>
    </row>
    <row>
      <entry><option>-f <replaceable>filename</replaceable></option></entry>
      <entry>
        Read in a file and execute the commands in it. These have
        the same format as the above commands, except that they don't have
        the dash "-" in front of them.
        Comment lines are supported and start with a hash sign "#".
      </entry>
    </row>
    <row>
      <entry><option>-h</option></entry>
      <entry>
        Show a brief summary of the commands.
      </entry>
    </row>
  </tbody>
</tgroup>
</table>

<para>
All numbers can be valid parameters to the <function>strtol()</function> function, so hex and
octal notation is fine. They have to be delimited by either commas "," or
slashes "/", spaces are not allowed.
</para>

<para>
The command line can have any number of commands. However, if none are given,
"-f -" is assumed, which means commands are taken from stdin.
</para>
</section>
</section>

<section><title>Features planned for the future</title>
<itemizedlist>
<listitem><para>Port it to more OS's.</para></listitem>
<listitem><para>Finish the OPL3 FM emulation by translating the music to midi data.</para></listitem>
</itemizedlist>
</section>

<section>
<title>Description of the sound output classes</title>
<para>
You can find a description of the sound output classes and more details on
Sound Blaster 16 emulation in the
<ulink url="../development/sb16-emulation-basics.html">developer documentation</ulink>.
</para>
</section>
</section> <!-- end of SB16 section-->

<section id="keymap"><title>How to write your own keymap table</title>
<para>
Christophe Bothamy wrote the keymapping code for Bochs, and provided this
documentation for how to create new keymaps.  Keymapping was first
implemented for X windows only, so there are many references to X-specific
values in this section. In Bochs 2.0 keymapping is also available for SDL
(Linux port) and wxWidgets (wxGTK port).
</para>
<screen>
  The standard US Keyboard looks like this:

          -------------------------------------------
  Top row Esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12
          -------------------------------------------
  2nd row ` 1 2 3 4 5 6 7 8 9 0 - = \ Back
          -------------------------------------------
  3rd row Tab Q W E R T Y U I O P [ ] Enter
          -------------------------------------------
  4rd row Caps A S D F G H J K L ; '
          -------------------------------------------
  5rd row lShift l\ Z X C V B N M , . / rShift
          -------------------------------------------
  6rd row lCtrl lAlt Space rAlt rCtrl
          -------------------------------------------
</screen>

<para>
Each key of the US keyboard maps to a Bochs constant named
BX_KEY_<replaceable>symbol</replaceable>. You can find the current list of
BX_KEY_<replaceable>symbol</replaceable> in
<link linkend="bx-key-table">the BX_KEY table</link>, below. Please note that
there is only one BX_KEY_<replaceable>symbol</replaceable> for each physical
key.
</para>

<para>
Now, for each key of the US keyboard, look at which symbols you can type on your
real keyboard. Each symbol maps to a X-windows
XK_<replaceable>symbol</replaceable> constant.  In
<filename>X11/keysymdef.h</filename>, you will find the list of all possible
XK_<replaceable>symbol</replaceable> on your system.  Alternatively, you can
use a small utility called "xev" that prints out the symbol names of a pressed
key. Note that the symbol name given by xev does not contain the XK_ prefix.
Don't forget to add a line for every symbol you can type on each key.  For the
key BX_KEY_A, you can type both lowercase 'a' and uppercase 'A', so you would
need two different entries.
</para>

<para>
You can then create your own map file. Keymap files are found in the
"gui/keymaps" directory in the source code, or in the "keymaps" directory in
binary releases.  Look at the existing keymap file as an example, and create a
file containing one line for each symbol.  The first column tells what key or
combination of keys can be used to produce a given symbol.  The second column
is the ASCII equivalent for that symbol, or a special keyword (none, space,
return, tab, backslash, or apostrophe).  The third column is the X windows
keysym for that symbol.
</para>


<para>
For example :
<screen>
BX_KEY_0                                      '0'        XK_0
BX_KEY_1                                      '1'        XK_1
BX_KEY_2                                      '2'        XK_2
BX_KEY_0+BX_KEY_SHIFT_L                       ')'        XK_parenright
BX_KEY_1+BX_KEY_SHIFT_L                       '!'        XK_exclam
BX_KEY_2+BX_KEY_SHIFT_L                       '@'        XK_at
BX_KEY_A                                      'a'        XK_a
BX_KEY_B                                      'b'        XK_b
BX_KEY_A+BX_KEY_SHIFT_L                       'A'        XK_A
BX_KEY_B+BX_KEY_SHIFT_L                       'B'        XK_B
BX_KEY_TAB                                    tab        XK_Tab
BX_KEY_ENTER                                  return     XK_Return
BX_KEY_F1                                     none       XK_F1
BX_KEY_F2                                     none       XK_F2
BX_KEY_F3                                     none       XK_F3
</screen>
</para>

<para>
Now that there are several keymap files in the Bochs distribution, it is
easiest to copy an existing keymap and follow the examples you see.  When it
works, be sure to send it to the mailing list or post it on Source Forge so
that we can include it in the next release.  You may need to look up some of
your country specific X11 symbols in <filename>X11/keysymdef.h</filename>.
</para>

<table id="bx-key-table"><title>BX_KEY constants</title>
<tgroup cols="2" align="center" colsep="1" rowsep="1">
<thead>
  <row>
    <entry> BX_KEY constant </entry>
    <entry> Keyboard Symbol </entry>
  </row>
</thead>
<tbody>

<row><entry>BX_KEY_CTRL_L</entry><entry> left Ctrl </entry></row>
<row><entry>BX_KEY_SHIFT_L</entry><entry> left Shift </entry></row>
<row><entry>BX_KEY_F1</entry><entry> F1 </entry></row>
<row><entry>BX_KEY_F2</entry><entry> F2 </entry></row>
<row><entry>BX_KEY_F3</entry><entry> F3 </entry></row>
<row><entry>BX_KEY_F4</entry><entry> F4 </entry></row>
<row><entry>BX_KEY_F5</entry><entry> F5 </entry></row>
<row><entry>BX_KEY_F6</entry><entry> F6 </entry></row>
<row><entry>BX_KEY_F7</entry><entry> F7 </entry></row>
<row><entry>BX_KEY_F8</entry><entry> F8 </entry></row>
<row><entry>BX_KEY_F9</entry><entry> F9 </entry></row>
<row><entry>BX_KEY_F10</entry><entry> F10 </entry></row>
<row><entry>BX_KEY_F11</entry><entry> F11 </entry></row>
<row><entry>BX_KEY_F12</entry><entry> F12 </entry></row>
<row><entry>BX_KEY_CTRL_R</entry><entry> right Ctrl </entry></row>
<row><entry>BX_KEY_SHIFT_R</entry><entry> right Shift </entry></row>
<row><entry>BX_KEY_CAPS_LOCK</entry><entry> CapsLock </entry></row>
<row><entry>BX_KEY_NUM_LOCK</entry><entry> NumLock </entry></row>
<row><entry>BX_KEY_ALT_L</entry><entry> left Alt </entry></row>
<row><entry>BX_KEY_ALT_R</entry><entry> right Alt </entry></row>
<row><entry>BX_KEY_A</entry><entry> A </entry></row>
<row><entry>BX_KEY_B</entry><entry> B </entry></row>
<row><entry>BX_KEY_C</entry><entry> C </entry></row>
<row><entry>BX_KEY_D</entry><entry> D </entry></row>
<row><entry>BX_KEY_E</entry><entry> E </entry></row>
<row><entry>BX_KEY_F</entry><entry> F </entry></row>
<row><entry>BX_KEY_G</entry><entry> G </entry></row>
<row><entry>BX_KEY_H</entry><entry> H </entry></row>
<row><entry>BX_KEY_I</entry><entry> I </entry></row>
<row><entry>BX_KEY_J</entry><entry> J </entry></row>
<row><entry>BX_KEY_K</entry><entry> K </entry></row>
<row><entry>BX_KEY_L</entry><entry> L </entry></row>
<row><entry>BX_KEY_M</entry><entry> M </entry></row>
<row><entry>BX_KEY_N</entry><entry> N </entry></row>
<row><entry>BX_KEY_O</entry><entry> O </entry></row>
<row><entry>BX_KEY_P</entry><entry> P </entry></row>
<row><entry>BX_KEY_Q</entry><entry> Q </entry></row>
<row><entry>BX_KEY_R</entry><entry> R </entry></row>
<row><entry>BX_KEY_S</entry><entry> S </entry></row>
<row><entry>BX_KEY_T</entry><entry> T </entry></row>
<row><entry>BX_KEY_U</entry><entry> U </entry></row>
<row><entry>BX_KEY_V</entry><entry> V </entry></row>
<row><entry>BX_KEY_W</entry><entry> W </entry></row>
<row><entry>BX_KEY_X</entry><entry> X </entry></row>
<row><entry>BX_KEY_Y</entry><entry> Y </entry></row>
<row><entry>BX_KEY_Z</entry><entry> Z </entry></row>
<row><entry>BX_KEY_0</entry><entry> 0 </entry></row>
<row><entry>BX_KEY_1</entry><entry> 1 </entry></row>
<row><entry>BX_KEY_2</entry><entry> 2 </entry></row>
<row><entry>BX_KEY_3</entry><entry> 3 </entry></row>
<row><entry>BX_KEY_4</entry><entry> 4 </entry></row>
<row><entry>BX_KEY_5</entry><entry> 5 </entry></row>
<row><entry>BX_KEY_6</entry><entry> 6 </entry></row>
<row><entry>BX_KEY_7</entry><entry> 7 </entry></row>
<row><entry>BX_KEY_8</entry><entry> 8 </entry></row>
<row><entry>BX_KEY_9</entry><entry> 9 </entry></row>
<row><entry>BX_KEY_ESC</entry><entry> Esc </entry></row>
<row><entry>BX_KEY_SPACE</entry><entry> SpaceBar </entry></row>
<row><entry>BX_KEY_SINGLE_QUOTE</entry><entry> ' </entry></row>
<row><entry>BX_KEY_COMMA</entry><entry> , </entry></row>
<row><entry>BX_KEY_PERIOD</entry><entry> . </entry></row>
<row><entry>BX_KEY_SLASH</entry><entry> / </entry></row>
<row><entry>BX_KEY_SEMICOLON</entry><entry> ; </entry></row>
<row><entry>BX_KEY_EQUALS</entry><entry> = </entry></row>
<row><entry>BX_KEY_LEFT_BRACKET</entry><entry> [ </entry></row>
<row><entry>BX_KEY_BACKSLASH</entry><entry> \ </entry></row>
<row><entry>BX_KEY_RIGHT_BRACKET</entry><entry> ] </entry></row>
<row><entry>BX_KEY_MINUS</entry><entry> - </entry></row>
<row><entry>BX_KEY_GRAVE</entry><entry> ` </entry></row>
<row><entry>BX_KEY_BACKSPACE</entry><entry> BackSpace </entry></row>
<row><entry>BX_KEY_ENTER</entry><entry> Enter </entry></row>
<row><entry>BX_KEY_TAB</entry><entry> Tab </entry></row>
<row><entry>BX_KEY_LEFT_BACKSLASH</entry><entry> left \ </entry></row>
<row><entry>BX_KEY_PRINT</entry><entry> PrintScreen </entry></row>
<row><entry>BX_KEY_SCRL_LOCK</entry><entry> ScrollLock </entry></row>
<row><entry>BX_KEY_PAUSE</entry><entry> Pause </entry></row>
<row><entry>BX_KEY_INSERT</entry><entry> Ins </entry></row>
<row><entry>BX_KEY_DELETE</entry><entry> Del </entry></row>
<row><entry>BX_KEY_HOME</entry><entry> Home </entry></row>
<row><entry>BX_KEY_END</entry><entry> End </entry></row>
<row><entry>BX_KEY_PAGE_UP</entry><entry> PageUo </entry></row>
<row><entry>BX_KEY_PAGE_DOWN</entry><entry> PageDown </entry></row>
<row><entry>BX_KEY_KP_ADD</entry><entry> Numeric Keypad + </entry></row>
<row><entry>BX_KEY_KP_SUBTRACT</entry><entry> Numeric Keypad - </entry></row>
<row><entry>BX_KEY_KP_END</entry><entry> Numeric Keypad 1 </entry></row>
<row><entry>BX_KEY_KP_DOWN</entry><entry> Numeric Keypad 2 </entry></row>
<row><entry>BX_KEY_KP_PAGE_DOWN</entry><entry> Numeric Keypad 3 </entry></row>
<row><entry>BX_KEY_KP_LEFT</entry><entry> Numeric Keypad 4 </entry></row>
<row><entry>BX_KEY_KP_5</entry><entry> Numeric Keypad 5 </entry></row>
<row><entry>BX_KEY_KP_RIGHT</entry><entry> Numeric Keypad 6 </entry></row>
<row><entry>BX_KEY_KP_HOME</entry><entry> Numeric Keypad 7 </entry></row>
<row><entry>BX_KEY_KP_UP</entry><entry> Numeric Keypad 8 </entry></row>
<row><entry>BX_KEY_KP_PAGE_UP</entry><entry> Numeric Keypad 9 </entry></row>
<row><entry>BX_KEY_KP_INSERT</entry><entry> Numeric Keypad 0 </entry></row>
<row><entry>BX_KEY_KP_DELETE</entry><entry> Numeric Keypad . </entry></row>
<row><entry>BX_KEY_KP_ENTER</entry><entry> Numeric Keypad Enter </entry></row>
<row><entry>BX_KEY_KP_MULTIPLY</entry><entry> Numeric Keypad * </entry></row>
<row><entry>BX_KEY_KP_DIVIDE</entry><entry> Numeric Keypad / </entry></row>
<row><entry>BX_KEY_UP</entry><entry> UpArrow </entry></row>
<row><entry>BX_KEY_DOWN</entry><entry> DownArrow </entry></row>
<row><entry>BX_KEY_LEFT</entry><entry> LeftArrow </entry></row>
<row><entry>BX_KEY_RIGHT</entry><entry> RightArrow </entry></row>
<row><entry>BX_KEY_WIN_L</entry><entry> Left Windows </entry></row>
<row><entry>BX_KEY_WIN_R</entry><entry> Right Windows </entry></row>
<row><entry>BX_KEY_MENU</entry><entry> Menu </entry></row>
<row><entry>BX_KEY_ALT_SYSREQ</entry><entry> Alt-Sysreq </entry></row>
<row><entry>BX_KEY_CTRL_BREAK</entry><entry> Ctrl-Break </entry></row>
<row><entry>BX_KEY_INT_BACK</entry><entry> Internet - back </entry></row>
<row><entry>BX_KEY_INT_FORWARD</entry><entry> Internet - forward </entry></row>
<row><entry>BX_KEY_INT_STOP</entry><entry> Internet - stop </entry></row>
<row><entry>BX_KEY_INT_MAIL</entry><entry> Internet - mail </entry></row>
<row><entry>BX_KEY_INT_SEARCH</entry><entry> Internet - search </entry></row>
<row><entry>BX_KEY_INT_FAV</entry><entry>Internet - favorites</entry></row>
<row><entry>BX_KEY_INT_HOME</entry><entry> Internet - home </entry></row>
<row><entry>BX_KEY_POWER_MYCOMP</entry><entry> Powerkeys - my computer </entry></row>
<row><entry>BX_KEY_POWER_CALC</entry><entry> Powerkeys - calculator </entry></row>
<row><entry>BX_KEY_POWER_SLEEP</entry><entry> Powerkeys - sleep </entry></row>
<row><entry>BX_KEY_POWER_POWER</entry><entry> Powerkeys - power </entry></row>
<row><entry>BX_KEY_POWER_WAKE</entry><entry> Powerkeys - wake </entry></row>

</tbody>
</tgroup>
</table>
</section>

</chapter>

<chapter id="using-bochs"><title>Using Bochs</title>
<para>
&FIXME;
<screen>
- using plugins?
- Resources for users
testing status page: tells what has been tried and who got it working
search on bochs web site
SourceForge
  - look for bug reports
  - how to report problems (present as FIXME request in chapter 6 as well)
  - How to make feature requests?
</screen>
</para>

<section id="commandline"><title>Command line arguments</title>
<para>
The following table shows the arguments that can be used on the command line.
For other arguments, see section <link linkend="bochsrc">bochsrc</link>.
<table>
<title>command line arguments</title>
<tgroup cols="2">
<thead>
<row>
<entry>Argument</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
  <entry>-q</entry>
  <entry>quick start (skip configuration interface)</entry>
</row>
<row>
  <entry>-f <replaceable>filename</replaceable></entry>
  <entry>specify configuration file</entry>
</row>
<row>
  <entry>-log <replaceable>filename</replaceable></entry>
  <entry>specify Bochs log file</entry>
</row>
<row>
  <entry>-dbglog <replaceable>filename</replaceable></entry>
  <entry>specify Bochs internal debugger log file</entry>
</row>
<row>
  <entry>-n</entry>
  <entry>don't try to load a configuration file</entry>
</row>
<row>
  <entry>-r <replaceable>path</replaceable></entry>
  <entry>specify path for restoring state</entry>
</row>
<row>
  <entry>--help</entry>
  <entry>display help message and exit</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<para>
These arguments are handled directly after starting Bochs. The next step is to load
a default or specified configuration file (unless disabled with -n). Then the rest
of the command line (<filename>bochsrc</filename> options) is parsed. This is done after reading the
configuration file so that the command line arguments can override the settings
from the file.
</para>
</section>

<section id="search-order"><title>Search order for the configuration file</title>
<para>
If no configuration file is specified on the command line and config file loading
is not disabled, Bochs searches for a default configuration file. This is the search order:
<orderedlist>
<listitem>
<para>
<filename>.bochsrc</filename> in the current directory
</para>
</listitem>
<listitem>
<para>
<filename>bochsrc</filename> in the current directory
</para>
</listitem>
<listitem>
<para>
<filename>bochsrc.txt</filename> in the current directory
</para>
</listitem>
<listitem>
<para>
(win32 only) <filename>bochsrc.bxrc</filename> in the current directory
</para>
</listitem>
<listitem>
<para>
(Unix only) <filename>.bochsrc</filename> in the user's home directory
</para>
</listitem>
<listitem>
<para>
(Unix only) <filename>bochsrc</filename> in the <filename class="directory">/etc</filename> directory
</para>
</listitem>
</orderedlist>
</para>
</section>
<section id="textconfig"><title>The configuration interface 'textconfig'</title>
<para>
The configuration interface 'textconfig' is the text mode version of the Bochs
configuration system. It is a series of menus (using stdin/stdout) that allows
you to edit all the settings that control Bochs' behavior. If you do not write
a config_interface line, Bochs will choose it as the default for you (unless Bochs
is compiled for Win32 or wxWidgets only).
</para>
<para>
It consists of these three parts:
<itemizedlist>
<listitem><para>the start menu</para></listitem>
<listitem><para>the headerbar buttons</para></listitem>
<listitem><para>the runtime configuration</para></listitem>
</itemizedlist>
</para>
<section><title>The start menu</title>
<para>
If you start Bochs without the quickstart argument (-q), the Bochs configuration
main menu appears:
<screen>
------------------------------
Bochs Configuration: Main Menu
------------------------------

This is the Bochs Configuration Interface, where you can describe the
machine that you want to simulate.  Bochs has already searched for a
configuration file (typically called bochsrc.txt) and loaded it if it
could be found.  When you are satisfied with the configuration, go
ahead and start the simulation.

You can also start bochs with the -q option to skip these menus.

1. Restore factory default configuration
2. Read options from...
3. Edit options
4. Save options to...
5. Restore the Bochs state from...
6. Begin simulation
7. Quit now

Please choose one: [5]
</screen>
</para>
<para>
Here you can load, edit and save the configuration and finally start the simulation.
It is possible to start Bochs without a config file and to edit all the settings using
the item "Edit options". Don't forget to save the configuration if you want to use this
setup for another Bochs session.
</para>
</section>

<section id="headerbar"><title>The Bochs headerbar</title>
<para>
<graphic format="PNG" fileref="../images/headerbar.png">
</para>
<para>
The headerbar appears on top of the Bochs simulation window. Here you can control the
behavoiur of Bochs at runtime if you click on one of these buttons:
<itemizedlist>
<listitem>
<para>floppy buttons</para>
<para>
  Here you can toggle the status of the floppy media (inserted/ejected). Bochs for
  win32 presents you a small dialog box for changing the floppy image. You can
  setup floppy drives using <link linkend="bochsopt-floppyab">floppya/floppyb option</link>.
</para>
</listitem>
<listitem>
<para>cdrom button</para>
<para>
  Here you can toggle the status of the cdrom media (inserted/ejected). CD-ROM drives
  can be set up using <link linkend="bochsopt-ata-master-slave">ata(0-3)-master/-slave option</link>.
  On some platforms this button brings a up a small dialog box for changing the
  CD-ROM image.
</para>
</listitem>
<listitem>
<para>mouse button</para>
<para>
  Here you can enable the creation of mouse events by the host. Once mouse
  events are captured, you cannot reach the button anymore, in order to disable
  capturing again. By default you can enable and disable the mouse capture pressing
  the CTRL key and the third (middle) mouse button. See the <link linkend="bochsopt-mouse">mouse option</link>
  parameter 'toggle' for other methods to toggle the mouse capture.
</para>
<para>&FIXME; Support for 2 button mouse to toggle the capture mode not yet complete.
  Some display libraries still don't support changing the mouse capture at runtime,
  but it is already supported on RFB, SDL, Win32, wxWidgets and X11.</para>
</listitem>
<listitem>
<para>user button</para>
<para>
  Press this button if you want to send the keyboard shortcut defined with the
  <link linkend="bochsopt-user-shortcut">user_shortcut option</link> to the guest.
  Depending on the used <link linkend="bochsopt-displaylibrary">display_library option</link>,
  it may even be possible to edit the shortcut before sending it.
</para>
</listitem>
<listitem>
<para>copy button</para>
<para>The text mode screen text can be exported to the clipboard after pressing this
button. The button has no effect in graphics mode.</para>
</listitem>
<listitem>
<para>paste button</para>
<para>Text in the clipboard can also be pasted, through Bochs, to the
guest OS, as simulated keystrokes. Keyboard mapping must be enabled to make this
feature work.</para>
</listitem>
<listitem>
<para>snapshot button</para>
<para>Press this button if you want to save a snapshot of the text mode screen.
Bochs for win32 presents you a "Save as..." dialog box. All other platforms are
using the fixed filename "snapshot.txt".</para>
</listitem>
<listitem><para>config button</para>
<para>This button stops the Bochs simulation and starts the runtime configuration.
(see below).</para>
</listitem>
<listitem>
<para>reset button</para>
<para>Press this button to trigger a hardware reset.</para>
</listitem>
<listitem>
<para>suspend button</para>
<para>Press this button to save current simulation state to a disk. The simulation
could be restored back using bochs -r command. For more details read
"Save and restore simulation" section of the user manual.</para>
</listitem>
<listitem>
<para>power button</para>
<para>This button stops the simulation and quits bochs.</para>
</listitem>
</itemizedlist>
</para>
<para>
Some of this features may not be implemented or work different on your host platform.
</para>
</section>
<section><title>The runtime configuration</title>
<para>
If you want to change certain settings at runtime, you have to press the "config" button in
the headerbar. The simulation stops and the runtime menu appears on the console window / xterm.
<screen>
---------------------
Bochs Runtime Options
---------------------
1. Floppy disk 0: /dev/fd0, size=1.44M, inserted
2. Floppy disk 1: floppyb.img, size=1.44M, inserted
3. 1st CDROM: (master on ata1) /dev/cdrom, ejected
4. 2nd CDROM: (slave on ata1) /dev/cdrecorder, ejected
5. 3rd CDROM: (not present)
6. 4th CDROM: (not present)
7. (not implemented)
8. Log options for all devices
9. Log options for individual devices
10. Instruction tracing: off (doesn't exist yet)
11. USB runtime options
12. Misc runtime options
13. Continue simulation
14. Quit now

Please choose one:  [15]
</screen>
</para>
<para>
In the runtime configuration you can change the floppy/cdrom image or device,
change the log options or adjust some other settings. If you have trouble with
a specific device, you can change the log options for this device only to get
more information (e.g. report debug messages). This cannot be done in the configuration
file yet.
</para>
</section>
</section>
<section id="using-save-restore"><title>Save and restore simulation</title>
<para>
Starting with version 2.3, Bochs has limited save/restore support. The state of
cpu(s), memory and all devices can be saved now. When running Bochs with there
will be a button in the header bar called "Suspend". Depending on config interface
and gui there will be a prompt where you can enter a path to an existing directory
or a gui folder selection dialog box. It is possible to save the state at any time,
but we recommend to do it when the simulation is idle. After pressing OK/Enter,
Bochs will save a set of files into the selected folder. The state of hard disk
images is not handled yet, so Bochs will ask you if you want to continue after
saving state. We don't recommend to continue unless you are running a read-only
guest system (e.g. Live-CD).
</para>
<para>
To restore the saved simulation state you can select the restore function in the
text mode start menu or specify the restore path at the command line:
<screen>
bochs -r /path/to/save-restore-data
</screen>
</para>
<para>
Then Bochs will start up using the saved configuration and log options, restores
the state of the hardware and begins the simulation. In the restore mode Bochs
will ignore bochsrc options from the command line and does not load a normal
config file.
</para>
</section>
</chapter>

<chapter id="common-problems">
  <title>Common problems and what to do about them (Troubleshooting)</title>
  <para>
    &FIXME;
    <screen>
      How to report a panic to the bug tracker?
      Keyboard mapping problems
      [...]
    </screen>
  </para>

  <section>
    <title>Bochs panics! What can I do?</title>
    <para>
      Bochs does a very good job in emulating an x86 compatible computer, however,
      it does not (yet) include a full (100%) emulation of every possible instruction,
      (BIOS) function call or (hardware) device. Thus, in case something unusual
      happens, either a not-so-common call to some (BIOS) function or device by
      some software running inside of it, Bochs has two possibilities to react:
      If the command doesn't look important (mainly happens only to non-implemented
      functions in the BIOS), a notice is logged to the <link linkend="bochsopt-log">log file</link>
      and the emulation continues. If, however, the command looks important, Bochs
      panics, because the software being emulated might depend on the successful
      execution of the given instruction or behavior of the device.
    </para>
    <para>
      A panic does not always mean that the software won't run inside of Bochs,
      as the software might just be probing the computer for the presence of some
      instruction/device, and in case it is not found, it simply won't be used at
      all, by the software.
    </para>
    <para>
      You can tell Bochs what to do in case of a panic, by re-configuring the
      <link linkend="bochsopt-debug-info-error-panic">panic option</link>. If
      you change the action to "ask", Bochs reports what has happened and asks
      you what to do. The appearance of the "ask" feature depends on the display
      library used and the platform. Some display libraries don't support it at all.
    </para>
    <para>
      Some of the device names reported in the panic message are abbreviations,
      since the length of the names is limited to 5 characters. This small list
      may help you finding out the name of the device that caused the panic.
    </para>
    <table><title>Device prefixes</title>
      <tgroup cols="2" align="left" colsep="1" rowsep="1">
      <thead>
        <row>
          <entry>Prefix</entry>
          <entry>Description</entry>
        </row>
      </thead>
      <tbody>
        <row>
          <entry>CLVGA</entry>
          <entry>Cirrus SVGA</entry>
        </row>
        <row>
          <entry>EFIRQ</entry>
          <entry>External FPU IRQ</entry>
        </row>
        <row>
          <entry>IOAP</entry>
          <entry>I/O APIC</entry>
        </row>
        <row>
          <entry>KMAP</entry>
          <entry>Keyboard mapping</entry>
        </row>
        <row>
          <entry>P2I</entry>
          <entry>PCI-to-ISA bridge</entry>
        </row>
        <row>
          <entry>PIDE</entry>
          <entry>PCI IDE controller</entry>
        </row>
        <row>
          <entry>PLGIN</entry>
          <entry>Plugin interface</entry>
        </row>
        <row>
          <entry>STIME</entry>
          <entry>Slowdown timer</entry>
        </row>
        <row>
          <entry>UNMP</entry>
          <entry>Unmapped I/O handler</entry>
        </row>
        <row>
          <entry>VTIME</entry>
          <entry>Virtual timer</entry>
        </row>
      </tbody>
      </tgroup>
    </table>
  </section>

  <section id="mouse-toggle">
    <title>Mouse behavior, enabling and disabling</title>
    <para>
      Refer to <xref linkend="headerbar"> for information on how to enable or
      disable the mouse inside of Bochs at run-time.
    </para>
    <para>
      &FIXME; Mouse behavior
    </para>
  </section>

  <section id="textmode-problems">
    <title>Text-mode is broken in some ancient DOS program</title>

    <para>
      If you are using a program written for DOS which seems to use the text-mode but
      doesn't display the text properly, you can try the other VGA BIOS, either
      <filename>VGABIOS-lgpl-latest</filename> or <filename>VGABIOS-elpin-2.40</filename>,
      see the <link linkend="bochsopt-vgaromimage">vgaromimage option</link>.
    </para>

    <para>
      &NEEDHELP; Maybe it is a bug in the LGPL VGA BIOS, but for now, it seems to work.
    </para>
  </section>
</chapter>

<chapter id="mailinglist">
<title>Mailing Lists</title>
<para>
The Bochs community uses three mailing lists to communicate, called
bochs-developers, bochs-cvs and bochs-announce.
</para>

<section id="bochs-developers"><title>bochs-developers mailing list</title>
<para>
Bochs-developers is the forum for all Bochs discussions and questions.  On
average, subscribers get between five and ten messages per day.  There are
about 350 subscribers.  If this sounds like too much email, maybe the <link
linkend="bochs-announce">bochs-announce list</link> is more appropriate for
you.  Anyone may join the list, unless they abuse it of course.
</para>
<para>
To subscribe, go to the <ulink url="http://lists.sourceforge.net/lists/listinfo/bochs-developers">Bochs-Developers Info Page</ulink> and type your email
address and a password into the web form and click
<command>Subscribe</command>.  In a few minutes you will get a confirmation
email.  Follow the directions in the email to complete the subscription
process.  To unsubscribe, go to the <ulink
url="http://lists.sourceforge.net/lists/listinfo/bochs-developers">same
page</ulink> and type your email address in the blank at the bottom and click
on <command>Edit Options</command>.  Then type your password and click
<command>Unsubscribe</command>.
</para>
<para>
Once you have subscribed, you can write to
<email>bochs-developers@lists.sourceforge.net</email> to send a message to
everyone on the list.  While it's possible to post without being a subscriber,
it's not recommended.  If you aren't a subscriber, you might miss the response
to your question.
</para>
<para>
<ulink url="http://sourceforge.net/mailarchive/forum.php?forum_name=bochs-developers">Archive of bochs-developers messages</ulink>
</para>
</section>  <!-- End of bochs-developers mailing list -->

<section id="bochs-announce"><title>bochs-announce mailing list</title>
<para>
Bochs-announce is a moderated, low-traffic list which carries only periodic
announcements of Bochs releases and important events.  If you have a very
important and truly relevant Bochs announcement, you can try posting it to
bochs-announce, but the moderator will have to approve it before it will
go out.  On average, bochs-announce subscribers get one or two messages
per month.  There are about 75 subscribers.  Anyone may join the list.
</para>

<para>
To subscribe, go to the <ulink url="http://lists.sourceforge.net/lists/listinfo/bochs-announce">Bochs-Announce Info Page</ulink> and type your email
address and a password into the web form and click <command>Subscribe</command>.
In a few minutes you will get a confirmation email.  Follow the directions in
the email to complete the subscription process.  To unsubscribe, go to the
<ulink url="http://lists.sourceforge.net/lists/listinfo/bochs-announce">same
page</ulink> and type your email address in the blank at the bottom and click
on <command>Edit Options</command>.  Then type your password and click
<command>Unsubscribe</command>.
</para>

<para>
There is no need to subscribe to both lists, because all bochs-announce
messages are forwarded to the developers list.  If you subscribe to both, you
will get 2 copies of every announcement.
</para>

<para>
<ulink url="http://sourceforge.net/mailarchive/forum.php?forum_name=bochs-announce">Archive of bochs-announce messages</ulink>
</para>

</section>  <!-- End of bochs-announce mailing list -->

<section id="bochs-cvs"><title>bochs-cvs mailing list</title>
<para>
This is the svn commit mailinglist (a unified diff email will be sent
whenever someone does a checkin in the bochs SVN repository).
</para>

<para>
<ulink url="http://sourceforge.net/mailarchive/forum.php?forum_name=bochs-cvs">Archive of bochs-cvs messages</ulink>
</para>

</section>  <!-- End of bochs-cvs mailing list -->

<section id="mailinglist-etiquette"><title>Mailing List Etiquette</title>

<para>
Here are a few guidelines for use of the Bochs mailing lists:
</para>

<itemizedlist>
<listitem> <para>
Please check the documentation before asking questions, but on this list you
are very UNLIKELY to get flamed and insulted for being a Bochs beginner.
Sending commercial promotions to the list probably will get you some angry
responses though.
</para> </listitem>

<listitem><para>
If you are having difficulty finding what you are looking for, try doing a search on <ulink url="http://www.google.com">Google</ulink>.  If you are searching for Bochs options, for example, you can use this syntax in the Google search box:
<programlisting>
configuration options site:bochs.sourceforge.net
</programlisting>
For best results, be sure not to put a space between "site:" and "bochs.sourceforge.net".  Be sure to look at more than the first item on the search results.
</para></listitem>

<listitem>
<para>
If you still cannot find what you are looking for, be sure you are prepared when you post your question, and post in the right forum.  Be sure you include important details, such as the operating system and version of your host, and what it is you are trying to do.   If you are getting errors or something is not working, summarize what you checked and what you changed.  This will help isolate the problem.
</para>
</listitem>

<listitem>
<para>
Bochs is for everyone.  If you are an experienced Bochs user or developer and are helping someone else, be considerate of the other person's feelings.  We share a common interest, and we need to encourage each other and be supportive.
</para>
</listitem>

<listitem> <para>
Also, keep in mind that messages are limited to 40K, so if you want to share a
large screen shot or disk image, put it on a web or FTP site and tell people
how to find it.  Patches are usually small enough that they aren't a problem,
especially if compressed.
</para> </listitem>

<listitem> <para>
Distribution of copyrighted material, or even offers to distribute copyrighted
material WILL NOT be tolerated.  The Bochs Project does not distribute
any software (disk images) in violation of the license agreement, and users who
do so will be warned first and then blocked from the list if it happens again.
As an open source project, we rely on donated services from Source Forge and
other groups, and we can't afford to put them or ourselves at risk of legal
action.
</para> </listitem>

<listitem> <para>
It is possible to subscribe and unsubscribe by email.  If you do this, you must
write to bochs-announce-request or bochs-developers-request.  Don't forget the
"-request" part or your subscribe message will go to 300+ people.
</para> </listitem>
</itemizedlist>

</section>
</chapter>

<chapter id="howto"><title>Tips and Techniques</title>

<section id="diskimagehowto"><title>How to make a simple disk image</title>
<para>
This was contributed by Greg Alexander in October 2001.
</para>
<para>
What you need:

<itemizedlist>
<listitem><para>
An executable version of Bochs. See <link linkend="downloading">Downloading Bochs</link> and <link linkend="compiling">Compiling Bochs</link>.
</para></listitem>
<listitem><para>
The bximage program, included with Bochs.
</para></listitem>
<listitem><para>
A FreeDOS boot disk, or a boot disk from another OS capable of
producing DOS partitions (e.g. a Linux install disk).
</para></listitem>
<listitem><para>
(Optional) mtools, a program for manipulating DOS disks/images.
</para></listitem>
</itemizedlist>

</para>

<section><title>
Create a flat image
</title>

<para>
Option 1: Using the Unix <command>dd</command> utility:
</para>

<para>
You will need to know the geometry of the disk you want to
create. You have to compute the disk sector count:

<screen>
Sectors = Cylinders * Heads * SectorsPerTrack
</screen>
</para>

<para>
Use the dd command to create your file:

<screen>
dd if=/dev/zero of=teaching.img bs=512 count=<replaceable>sectors</replaceable>
</screen>
(replace "sectors" with the number you computed at the
previous step).
</para>

<para>
When you'll update your configuration file, please
fill in the same cylinders, heads and sector per
track values.
</para>


<para>
Option 2: Run <command>bximage</command> to create a disk image file.
You will be greeted with the following prompt:

<screen>
========================================================================
                                bximage
                  Disk Image Creation Tool for Bochs
========================================================================

Do you want to create a floppy disk image or a hard disk image?
Please type hd or fd. [hd]
</screen>
</para>


<para>
Since we are creating a hard disk image, accept the default of hd by
pressing <keycap>Enter</keycap> or typing 'hd' and pressing
<keycap>Enter</keycap>. Next, bximage will ask for the type of
hd to create:

<screen>
What kind of image should I create?
Please type flat, sparse or growing. [flat]
</screen>
</para>


<para>
We want to create a simple flat image, so accept the default
by pressing <keycap>Enter</keycap>. Then, bximage will ask
for the size of the disk image you want to create, in Megabytes:

<screen>
Enter the hard disk size in megabytes, between 1 and 32255
[10]
</screen>
</para>


<para>
Enter the size of the hard disk you want to create, and press
<keycap>Enter</keycap>.
Bochs will give you some information about the image it is creating, and
ask you for a filename to use for the file it is creating.  I told it to
use the default of 10 megabytes, and was given the following information
along with the prompt for a filename:

<screen>
[10] 10

I will create a hard disk image with
  cyl=20
  heads=16
  sectors per track=63
  total sectors=20160
  total size=9.84 megabytes

What should I name the image?
[c.img]
</screen>
</para>


<para>
At this point, type in the filename you want to use for the image.  The
default of "c.img" is appropriate if this will be your only hard disk
image.  After you have typed in the name of the filename you want to
use, press <keycap>Enter</keycap>.  Bximage will tell you it is writing the disk and
will display a status bar as you wait.  When it is finished, it will
give you a final status report and tell you a line that should be added
to your <filename>bochsrc</filename> when you want to use this disk image. I named my
10 Megabyte image "teaching.img" and the output of bximage looked like
this:

<screen>
[c.img] teaching.img

Writing: [..........] Done.

I wrote 10321920 bytes to teaching.img.
</screen>
</para>

<para>
The following line should appear in your <filename>bochsrc</filename>:
<screen>
  <link linkend="bochsopt-ata-master-slave">ata0-master</link>: type=disk, path="teaching.img", mode=flat, cylinders=20, heads=16, spt=63
</screen>
</para>


<para>
At this point, a file called "teaching.img" was created in my current
directory and is ready to be used as an image file for a Bochs session.
</para>

<tip>
<para>
You may want to name your image <filename>teaching_20-16-63.img</filename>
so that you always know the values to use for CHS.
</para>
</tip>
</section>

<section>
<title>
Partition and format your image file
</title>

<para>
Option 1: Using FreeDOS (Advantage: Creates a MBR on the partition.)
</para>

<para>
First, you need to edit the <filename>bochsrc</filename> file that Bochs uses for
configuration information (see <xref linkend="search-order">). Open <filename>bochsrc</filename>
with a text editor. Remove all lines in the file which start with "ata0-master:". Add the "ata0-master:"
line that was displayed when you ran bximage to <filename>bochsrc</filename> at the
same place where you removed the old "ata0-master:" lines from.
</para>

<para>
Also, you need to download or create a FreeDOS (or DOS, or Windows, or
Linux) disk image. Modify the "floppya:" line in your <filename>bochsrc</filename> to point
at the downloaded FreeDOS floppy image and change its status to "status=inserted".
</para>

<para>
Save and close your <filename>bochsrc</filename>. Now run Bochs (see <xref linkend="using-bochs">).
</para>

<para>
Use the standard FreeDOS commands <command>fdisk</command> and
<command>format</command> to format your hard
drive image. You must make the image bootable to be able to boot
without a floppy disk. However, creating a bootable disk image is best
done with a boot disk from the OS you intend to install on the image.
</para>


<para>
Option 2: Using mtools (Disadvantage: Cannot create bootable images
without a MBR image.)
</para>

<para>
Use a text editor to add the following line to the file <filename>~/.mtoolsrc</filename>:
</para>


<screen>
drive c: file="<replaceable>path</replaceable>/filename.img" partition=1
</screen>


<para>
Save and close <filename>.mtoolsrc</filename>. Next, execute the following commands to
create a partition table for the drive image:
</para>


<screen>
mpartition -I -s <replaceable>spt</replaceable> -t <replaceable>cyl</replaceable> -h <replaceable>heads</replaceable> c:
mpartition -cpv -s <replaceable>spt</replaceable> -t <replaceable>cyl</replaceable> -h <replaceable>heads</replaceable> c:
</screen>

<para>
For example, for my 10 meg drive, I used:
<screen>
mpartition -I -s 63 -t 20 -h 16 c:
mpartition -cpv -s 63 -t 20 -h 16 c:
</screen>
</para>


<para>
Next, format the partition you just created using the mformat command:

<screen>
mformat c:
</screen>
</para>


<para>
And you now have a formatted disk image containing a single DOS
partition.
</para>
<note><para>
The mpartition command doesn't handle images larger than 1024 cylinders properly.
The partition size reported by fdisk is okay, but mformat reports only 504 MB
(tested with mtools 3.9.9).
</para></note>
</section>
</section> <!-- end of Unix: How to make a disk image -->

<section id="mtools"><title>Use mtools to manipulate disk images</title>
<para>
Mtools is a set of programs that can read, write, and format DOS disk images.
There are links to the Mtools main page and a Win32 port of Mtools on the
<ulink url="http://bochs.sourceforge.net/links.html">Bochs Links page</ulink>,
under Resources.
</para>
<para>
The mtools web site has a detailed manual.  If anyone wants to write
instructions specific to Bochs, we can add it right here.
</para>
</section>

<section id="bochs-linux-disktools"><title>Bochs GNU/Linux DiskTools</title>
<para>
&FIXME;
Bochs tools are external tools developed by ..., and useful to copy
to / from guest partition from a GNU/Linux host.
</para>
</section>

<section id="winimage"><title>Win32 only: Tools to manipulate disk images</title>

<section> <title>Winimage</title>
<para>
Someone on the bochs-developers list mentioned that they use a program
called WinImage, from <ulink url="http://www.winimage.com">www.winimage.com</ulink>
to read and write disk images (floppy and hard disk).  Winimage is a
commercial product with a 30-day trial.
</para>
<para>
If anyone wants to write a tutorial, send mail to &devlist; and volunteer.
</para>
</section>

<section> <title>DiskExplorer</title>
<para>
This section was contributed by Luca Cassioli and Stanislav Shwartsman
</para>
<para>
I eventually found what all of you were looking for for a long time: a
freeware, graphical, win32 compatible HardDisk image editor! It can
handle a large variety of formats, but the one you need is VMWARE
2.0 PLAIN DISK: you can import/export to/from Bochs images COMPLETE
DIRECTORIES!
</para>
<para>
You can find it at
<ulink url="http://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html">
http://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html</ulink>
</para>
</section>

<section> <title>Ben Lunt's MTOOLs for Bochs and Win32 and/or DOS</title>
<para>
Ben Lunt wrote a set of utilities for Dos/Win32 to manipulate flat disk images.
</para>
<para>
You can find it at
<ulink url="http://www.frontiernet.net/~fys/mtools.htm">
http://www.frontiernet.net/~fys/mtools.htm</ulink>
</para>
<para>
These utilities includes :
<itemizedlist>
<listitem><para>
        BOCHSRC.EXE "Bochs Resource"
        A utility to create/modify a Bochs resource file.
</para></listitem>
<listitem><para>
        MKDOSFS.EXE  "Make DOS FS"
        A utility to create a FAT disk image of specified size.
</para></listitem>
<listitem><para>
        MCOPYF.EXE  "Copy From"
        A utility to copy an existing file from a FAT disk image to the current
        directory.
</para></listitem>
<listitem><para>
        MDEL.EXE  "Delete file"
        A utility to delete an existing file from a FAT disk image.
</para></listitem>
<listitem><para>
        MDIREX.EXE  "Directory Extended"
        A utility to view a FAT disk images directory and FAT contents.
</para></listitem>
<listitem><para>
        MGETIMG.EXE  "Get Disk Image"
        A utility to create a disk image from a floppy (multiple formats).
</para></listitem>
<listitem><para>
        MBOOTCD.EXE  "Create a CDROM Image with boot options"
        Create a CDROM image capable of booting with only a ROOT and a single file.
</para></listitem>
<listitem><para>
        MGETCD.EXE  "Get Disk Image of Physical CD"
        A utility to create a disk image from a CD.
</para></listitem>
<listitem><para>
        MCDINFO.EXE  "Get CD Info"
        A utility to the info from a CD.  Not much yet, but a little.
</para></listitem>
</itemizedlist>

</para>
</section>

</section>

<section id="xcolormap"><title>X Windows: Color allocation problems</title>
<para>
One common problem in X windows is that the screen colors can be abnormal
if other X programs have already allocated all the colors.  If the colors
don't look right, try quitting colorful applications such as Netscape,
clearing any complex images in the background, etc. so that Bochs has a
chance to allocate the colors it needs.
</para>
<para>
If Bochs continues to have problems, or you want Bochs to have perfect
colors without having to quit any other application, you can try turning
on the <link linkend="bochsopt-private-colormap">private_colormap option</link>
in the configuration file.  Using a private
colormap causes the Bochs window to have its own set of 256 colors to work
with.  When the cursor is over the Bochs display, Bochs will look correct
and other parts of the screen may change to very strange colors.  When the
cursor goes to any other window, the other windows will look correct
and Bochs will have strange colors.  A better solution, if your hardware
can support it, is to run your X server with 24-bit or 32-bit color.
</para>
</section>

<section id="screensaver"><title>Screen saver turns on too quickly</title>

<para>
One thing you may notice is that the screen saver turns on (screen goes
blank) very quickly after you have stopped typing.  The reason is that Bochs
simulates everything as fast as it can.  If the CPU is very busy (running
instructions nonstop), simulated time goes by slowly.  If the CPU is idle (just
waiting for you to type, for example), simulated time speeds up dramatically.
In any case, if the screen saver blanks out the screen, just press a key (try
shift or control) to restore the screen.
</para>

<para>
There are two strategies to fix this problem.  One is to increase the
<command>ips</command> parameter of the <link linkend="bochsopt-cpu">cpu option</link>
in your configuration file. This will cause the simulation time
to pass more slowly.  The other strategy is to enable the experimental
realtime PIT, which tries to keep Bochs in sync with real time. See the <filename>bochsrc</filename>
option <link linkend="bochsopt-clock">clock</link>.
</para>

</section>


<section id="loop-device-usage"><title>Mounting a disk image using the loop device</title>

<para>
This section describes how to access a floppy or hard disk image within Linux
using the loop device. Why would you want to do this?  Let's say you have made
a small Linux disk image for Bochs, and you want to install some more software
on it. You have already downloaded the software onto your real system, so now
you want to transfer it to the Bochs disk image.  A fast way to transfer
the files is to mount the disk image using the loop device.
</para>

<section><title>...on Linux</title>

<para>
This section was contributed by Volker Ruppert.
<screen>
Today I have made some tests with the loop device, because I want to exchange
files with the bochs disk images.  This is what I found out:

1.  Using Floppy images is easy, because there is no partition table:

    losetup /dev/loop0 /usr/local/bochs/dlxlinux/floppya.img

    Now you can use the image like a real floppy:

    - format           : mkfs.minix /dev/loop0
    - filesystem check : fsck.minix /dev/loop0
    - mount            : mount /dev/loop0 -o loop /mnt/floppy

    Before you want to restart bochs you must do this:

    losetup -d /dev/loop0

    Don't forget to umount before.

2.  If you want access to a hard disk image, you have to calculate the size of
    the first cylinder. This value is the offset argument for losetup.

    offset = bytes per sector * sectors per cylinder

    The command for dlxlinux image looks like this:

    losetup /dev/loop0 /usr/local/bochs/dlxlinux/hd10meg.img -o 8704

    For images created by bximage you must use the value 32256.

3.  The hard disk image access doesn't work if the image contains more than
    one partition.

4.  I have made this tests with Linux and I don't know how
    this could be done with other operating systems.
</screen>
</para>

</section>

<section><title>...on FreeBSD</title>

<para>
This section was contributed by Alexander Schuch.
</para>
<para>
The following example mounts a Windows 95 hard disk image called <filename>Windows 95 B (2031-16-63)</filename>
into the FreeBSD file system. It is specific to FreeBSD 5.x; for
hints on how to do the same task on FreeBSD 4.x, or for more information in
general, check the proper section of the FreeBSD handbook:
<ulink url="http://www.freebsd.org/doc/en/books/handbook/disks-virtual.html">Network, Memory, and File-Backed File Systems</ulink>.
You can use the same procedure for mounting floppy disk images.
</para>

<para>
<screen>
<prompt>#</prompt> <userinput>mdconfig -a -t vnode -f "Windows 95 B (2031-16-63)"</userinput>
md0
</screen>
mdconfig returns the device, your file now is accessable from.
<screen>
<prompt>#</prompt> <userinput>mount -t msdosfs /dev/md0s1 /mnt</userinput>
</screen>
If you already have other md devices configured, you need to substitute md0s1
with, for example, md6s1.
</para>

<para>
Once you are done working with the image, unmount the md device and detach it.
<screen>
<prompt>#</prompt> <userinput>umount /mnt</userinput>
<prompt>#</prompt> <userinput>mdconfig -d -u 0</userinput>
</screen>
And again, if there are other md devices configured, use the proper device
number. In case you forgot the number, just ask <command>mdconfig</command>, like:
<screen>
<prompt>#</prompt> <userinput>mdconfig -l</userinput>
md7
<prompt>#</prompt> <userinput>mdconfig -d -u 7</userinput>
</screen>
</para>

</section>

</section>  <!-- end of Mounting a disk image using the loop device -->

<section id="SMP"><title>Simulating a Symmetric Multiprocessor (SMP) Machine</title>
<para>
Bochs can now simulate an SMP machine when you use "--enable-smp" in the
configure command.  SMP support was added by Bryce Denney, who
was very interested in watching a multiprocessor operating system work
at a low level.  It should also be helpful to operating system developers
who are writing SMP drivers, or just for users who want to test drive
an SMP machine to see what it looks like.
</para>
<para>
Starting with Bochs 2.2.6 you can set up the number of processors in the
<filename>bochsrc</filename>. See <xref linkend="bochsopt-cpu"> how to
set up the number of processors.
</para>
<para>
It is important to understand that configuring bochs for 4 processors will NOT
make your single-threaded applications run faster in general!  On the contrary,
it has to spend time simulating idle processors as well as the ones doing your
task.  The point is to simulate an SMP system, not to speed up a uniprocessor
application.
</para>

<para>
What was required to make SMP work in Bochs?

<itemizedlist>
<listitem><para> local APIC on each processor with timer
</para></listitem>
<listitem><para> one I/O APIC model
</para></listitem>
<listitem><para> implement RDTSC (read time stamp counter)
</para></listitem>
<listitem><para> a data structure called the Intel Multiprocessor Configuration
must be present in BIOS memory space. An SMP-aware operating system probes BIOS
memory to find the structure, which contains information about how many
processors, their IDs, interrupt sources, etc. Starting with Bochs 2.2.5 these
structures are dynamically created by Bochs.
</para></listitem>
<listitem><para> ACPI support is required to boot SMP system in most of modern
operating systems. For example WinXP 64 bit require ACPI support even for
single processor configuration.
</para></listitem>
</itemizedlist>
</para>

<para>
What needs to be done to improve SMP support?

<itemizedlist>
<listitem><para>
debugger support is still limited.  For example, you can set breakpoints,
but you can't specify which processor you want to set the breakpoint for.
</para></listitem>

<listitem><para>
test on any possible SMP operating systems. Currently success reported for
Knoppix 4.0.2, WinNT 4.0 and WinXP SMP.
</para></listitem>

<listitem><para>
several parts of the APIC model which weren't needed before are not
implemented yet.
</para></listitem>

<listitem><para>
A number of people have suggested using threads to simulate each CPU in
a different thread.  Then on a real SMP machine, the threads can execute
in parallel.  This is a great idea, but it's not done at present.
</para></listitem>
</itemizedlist>
</para>
</section>

<section id="dlxlinux-networking"><title>Setting Up Networking in DLX Linux</title>
<para>
All Bochs binaries come with a working version of DLX Linux.  This section
describes how to configure networking in Bochs and enable it within
DLX Linux.  First you must add a <varname>ne2k</varname> line in your bochsrc
file.  Then, when you boot the DLX Linux image, you need to type some Linux
commands to set up an IP address, a network route, and a name server.
</para>

<para>
When you have an <varname>ne2k</varname> line in your bochsrc file, Bochs
will emulate a network card called an NE2000.  Below are some examples of valid
<varname>ne2k</varname> lines for various operating systems.  Choose the
one that's closest to what you need, add it to your bochsrc file, and
edit the values if necessary.
<screen>
  # sample for Mac OS X
  ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=en0
  # sample for FreeBSD
  ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xl0
  # sample for Linux
  ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
  # sample for Windows
  ne2k: ioaddr=0x300, irq=9, mac=00:c4:3B:00:C3:00, ethmod=win32, ethdev=NE2000
</screen>
You see the pattern.  Usually you won't need to change the I/O address, IRQ
number, or MAC address.  The <varname>ethmod</varname> value depends on your
host operating system, and it must be either <constant>null</constant>,
<constant>fbsd</constant> (for FreeBSD or OpenBSD), <constant>linux</constant>,
or <constant>win32</constant>.  The <varname>ethdev</varname> setting is the
name of the network interface on your system, and is also OS-dependent.  On
UNIX systems you can get the name of the network interface by running
<command>ifconfig</command>.  (Don't choose the loopback interface.)  On
Windows systems, the correct ethdev setting is not always obvious, so we
provide a utility called <command>niclist</command> to list the names of
network interfaces to use.  When you run <command>niclist</command>, it will
suggest an <varname>ne2k</varname> line which is a very good first try.
</para>

<para>
Next, if you are on a UNIX machine you will need to become the root user.
Since bochs is sending and receiving raw network packets, you need to be root
to use the network device.  To allow normal users to do this would be a
security problem.
</para>

<para>
Now run Bochs to boot DLX Linux.  Press enter a few times to accept the default
configuration choices.  This tells Bochs read the configuration file and then
begin.  DLX Linux should boot in the Bochs window, and you should see
that Linux detects the NE2000 card.  Eventually it gets to a login prompt.
<screen>
  ne.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)
  NE*000 ethercard probe at 0x300: b0 c4 20 00 00 00
  eth0: NE2000 found at 0x300, using IRQ 9.
</screen>
</para>

<para>
At the login prompt, type "root" to log in as root. Then type the ifconfig and
route commands to set up networking.  The exact IP numbers in the example won't
work for you; you must choose an IP configuration that is legal on your
network.

<screen>
  dlx login: root
  Linux 1.3.89.
  dlx:~# ifconfig eth0 192.168.0.99         # set bochs IP address
  dlx:~# route add -net 192.168.0.0         # first 3 numbers match IP
  dlx:~# route add default gw 192.168.0.1   # your gateway to the net
  dlx:~# _
</screen>
</para>

<note>
<para>
The bochs IP address must be an unused IP address on your
network.  If you duplicate someone else's IP address, your network will
become very confused.
</para>
</note>

<para>
Finally, the network is ready and you can test it out with ping, telnet, or ftp
to various machines by their numerical IP address.  Keep in mind that for all
UNIX host platforms, Bochs networking cannot talk to the host machine.  That
means the host machine can't be the gateway either.  You need another physical
machine on the network that bochs can talk to.  On Win32 this restriction does
not apply.
</para>

<note>
<para>
When you have a working network configuration, you can make DLX Linux recreate
the same settings the next time you boot.  Just add the ifconfig and route
commands to the end of /etc/rc.d/rc.inet1.  I won't try to describe how
to use the <command>vi</command> editor in this limited amount of space...
</para>
</note>



<para>
To configure a name
server, set up <filename>/etc/resolv.conf</filename> with the IP address of
your name server as shown.
<screen>
   dlx:~# echo 'nameserver 192.168.0.1' > /etc/resolv.conf
</screen>
</para>
</section>

<section id="config-tuntap"><title>Configuring and using a tuntap network interface</title>
<para>
If you use linux (optionally FreeBSD and Solaris, not tested),
you may want to access the network through a tuntap interface. The main
advantage of this interface, is that the guest has access to the host. The guest can even
have access to the whole network if the host routes or masquerades the guest requests.
No extra IP address is needed, all can be done using private IP addresses.
</para>

<para>
You'll find here instructions to set up Linux/Bochs to provide network access to the guest OS
through a tuntap interface and private IP network. We're going to see howto :
<itemizedlist>
<listitem> <para>enable the tuntap interface in the Linux Kernel </para> </listitem>
<listitem> <para>configure Bochs to use the tuntap interface </para> </listitem>
<listitem> <para>set up the private network between the host and the guest </para> </listitem>
<listitem> <para>set up the host to masquerade the guest network accesses </para> </listitem>
</itemizedlist>
</para>
<section>
        <title>Tuntap description</title>
<para>
From the <ulink url="http://www.kernel.org/pub/linux/kernel/people/marcelo/linux-2.4/Documentation/networking/tuntap.txt">
tuntap.txt</ulink> file in the Linux kernel tree :
<screen>
  TUN/TAP provides packet reception and transmission for user space programs.
  It can be viewed as a simple Point-to-Point or Ethernet device, which
  instead of receiving packets from a physical media, receives them from
  user space program and instead of sending packets via physical media
  writes them to the user space program.

  When a program opens /dev/net/tun, driver creates and registers corresponding
  net device tunX or tapX. After a program closed above devices, driver will
  automatically delete tunXX or tapXX device and all routes corresponding to it.
</screen>
</para>
</section> <!-- Tuntap description -->

<section>
        <title>Set up the linux Kernel
        <footnote><para>much of the information of the following section is taken from
        <ulink url="http://maconlinux.org/lists/mol-general/August01/0056.html">
        this email from Samuel Rydh of the Mac-On-Linux list</ulink></para></footnote></title>
<para>
First make sure the tuntap module is included in the kernel :
<itemizedlist>
<listitem>
        <para>if you use a recent distribution, chances are that the needed modules are already build</para>
        <para>Make sure that "Kernel module loader" - module auto-loading support is enabled in your kernel.</para>
        <para>Add following line to the /etc/modules.conf: <screen> alias char-major-10-200 tun </screen> </para>
        <para>Run: <screen> depmod -a</screen> The driver will be automatically loaded when application access /dev/net/tun.</para>
</listitem>
<listitem>
        <para>Otherwise, recompile the kernel, including the configuration option
        <screen> CONFIG_TUN (Network device support -> Universal TUN/TAP device driver support) </screen>
        </para>
</listitem>
</itemizedlist>
<note>
<para>
Make sure there is a /dev/net/tun device.
(Can be created with '<command>mkdir /dev/net ; mknod /dev/net/tun c 10 200'</command>).
</para>
</note>
</para>
<para>
In the same way, to use masquerading, you need a kernel with the following options :
<screen>
 CONFIG_IP_NF_CONNTRACK (Connection tracking)
 CONFIG_IP_NF_IPTABLES (IP tables support)
 CONFIG_IP_NF_NAT (Full NAT)
</screen>
<note>
<para>
Some of the other options in this group is probably also needed,
(but the default setting should be OK).
</para>
</note>
</para>
</section> <!-- Set up the linux Kernel -->

<section>
        <title>Configure Bochs to use the tuntap interface</title>
        <para>Make sure Bochs has ne2000 support. If you have to recompile Bochs,
                <command>--enable-ne2000</command> when running <command>./configure</command>
                (see <xref linkend="compiling">)
        </para>
        <para>edit your <replaceable>.bochsrc</replaceable> configuration file and add something like :
                <screen>  ne2k: ioaddr=0x300, irq=9, mac=fe:fd:00:00:00:01,
                          ethmod=tuntap, ethdev=/dev/net/tun0, script=<replaceable>/path/to/tunconfig</replaceable>
                </screen>
        </para>
        <para>
                Since the tuntap interface cannot be configured until a process opens it,
                Bochs may run a script file for you. In this case
                <replaceable>/path/to/tunconfig</replaceable> should be changed to match
                the actual place where you'll create this script.
        </para>
</section> <!-- Configure Bochs to use the tuntap interface -->

<section>
<title>Set up the private network between the host and the guest </title>
        <para>
        We'll set up a private network between the host and the guest with the following parameters:
        <screen>
                Host IP : 192.168.1.1
                Guest IP : 192.168.1.2
        </screen>
        If your parameters are different, adapt the rest of the section to suit your needs.
        </para>
        <para>
        Create the <replaceable>/path/to/tunconfig</replaceable> script :
        <screen>
        #!/bin/bash
        /sbin/ifconfig ${1##/*/} 192.168.1.1
        </screen>
        The script get the interface name as the first parameter. Linux
        will forward incoming packets between interfaces.
        </para>
        <para>
        Make it executable :<screen>chmod 755 <replaceable>/path/to/tunconfig</replaceable></screen>
        </para>
        <para>
        Run Bochs, install the guest OS, and set the following network parameters in the guest OS:
        <screen>
        IP: 192.168.1.2
        netmask: 255.255.255.0
        gateway: 192.168.1.1
        nameserver: whatever is used in linux
        </screen>
        <note>
        <para>
        Bochs must be started by root (at least for now - the
        script won't have root privileges otherwise).
        </para>
        </note>
        You may also have to edit /etc/hosts.allow in the host OS and add :
        <screen>
        ALL: 192.168.1.2
        </screen>
        Don't forget to set up the route on the guest.
        </para>
        <para>
        At this point, you should be able to ping/telnet/ftp/ssh the guest from the host
        and vice-versa.
        </para>
</section> <!-- Set up the private network between the host and the guest -->

<section>
<title>Set up the host to masquerade the guest network accesses</title>
        <para>
        We are going to set up standard masquerading configuration. Edit
        the  <replaceable>/path/to/tunconfig</replaceable> script ans add :
        <screen>
        /sbin/iptables -D POSTROUTING -t nat -s 192.168.1.0/24 -d ! 192.168.1.0/24 -j MASQUERADE >& /dev/null
        /sbin/iptables -t nat -s 192.168.1.0/24 -d ! 192.168.1.0/24 -A POSTROUTING -j MASQUERADE
        echo 1 > /proc/sys/net/ipv4/ip_forward
        </screen>
        <note>
        <para>
        The configuration assumes the default policy is
        ACCEPT (can be examined by doing '<command>/sbin/iptables -L</command>')
        </para>
        </note>
        <note><para> The iptables package must be installed. </para> </note>
        And voila... The host should forward the packets of the guest to the rest of your network.
        You could even have acces to the internet...
        &FIXME; add nice screenshot
        <note>
        <para>
        You may need to load other modules if you want to use other fancy protocols (ftp,etc...)
        </para>
        </note>
        </para>
</section> <!-- Set up the host to masquerade the guest network accesses -->
</section>

<section id="internal-debugger">
<title>Using Bochs internal debugger</title>

<para>
Note, if you are looking for a graphical front-end for the
bochs debugger, you may want to check out
<ulink url="http://bfe.sourceforge.net/">BFE</ulink>. This is a
package written by a Bochs user which can interface with
the text based Bochs debugger.  No linking is necessary.
It's not part of Bochs, but you may find it useful.
</para>

<para>
You can now conditionally compile in a GDB like command line debugger, that
allows you to set breakpoints, step through instructions, and other
useful functions.  If there isn't a command for something you believe
is generally useful for the debugger, let me know and I'll implement
it if possible.
</para>

<para>
To use the debugger, you must configure Bochs with the
<option>--enable-debugger</option> and <option>--enable-disasm</option> flags.
For example:
<screen>
  ./configure --enable-debugger --enable-disasm
</screen>
</para>

<note><para>
You must use flex version 2.5.4 or greater.  I have heard that
version 2.5.2 will not work.
</para></note>

<para>
When you first start up Bochs, you will see the command line prompt

<screen>
  bochs:1>
</screen>

From here, you may use the following commands:
</para>

<section>
<title>Execution Control</title>
<para>
<screen>
  c                           continue executing
  cont
  continue

  s     [count]               execute count instructions, default is 1
  step  [count]

  s     [cpu] [count]         for SMP simulation, execute count instructions on cpu, default is 1
  step  [cpu] [count]

  s     all [count]           for SMP simulation, execute count instructions on all cpus
  step  all [count]

  Ctrl-C                      stop execution, and return to command line prompt
  Ctrl-D                      if at empty line on command line, exit

  q                           quit debugger and execution
  quit
  exit
</screen>
</para>
</section>

<section>
<title>BreakPoints</title>
<para>
<screen>
  NOTE: The format of 'seg', 'off', and 'addr' in these descriptions,
        are as follows.  I don't have any way to set the current radix.

        hexidecimal:    0xcdef0123
        decimal:        123456789
        octal:          01234567

  vbreak seg:off              Set a virtual address instruction breakpoint
  vb     seg:off

  lbreak addr                 Set a linear address instruction breakpoint
  lb     addr

  pbreak [*] addr             Set a physical address instruction breakpoint
  pb     [*] addr             (the '*' is optional for GDB compatibility)
  break  [*] addr
  b      [*] addr

  info break                  Display state of all current breakpoints
  bpe    n                    Enable a breakpoint
  bpd    n                    Disable a breakpoint
  delete n                    Delete a breakpoint
  del    n
  d      n

</screen>
</para>
</section>

<section>
<title>Memory WatchPoints</title>
<para>
<screen>

  watch read  addr            Insert a read watch point at physical address <varname>addr</varname>
  watch r     addr            Insert a read watch point at physical address <varname>addr</varname>

  watch write addr            Insert a write watch point at physical address <varname>addr</varname>
  watch w     addr            Insert a write watch point at physical address <varname>addr</varname>

  watch                       Display state of current memory watchpoints

  watch stop                  Stop simulation when a watchpoint is encountered (default)
  watch continue              Do not stop simulation when a watchpoint is encountered

  unwatch addr                Remove watchpoint to specific physical address
  unwatch                     Remove all watch points

  trace-mem on/off            Enable/Disable memory access tracing

</screen>
</para>
</section>

<section>
<title>Manipulating Memory</title>
<para>
<screen>
  x  /nuf addr      Examine memory at linear address addr
  xp /nuf addr      Examine memory at physical address addr
     n              Count of how many units to display
     u              Unit size; one of
                      b Individual bytes
                      h Halfwords (2 bytes)
                      w Words (4 bytes)
                      g Giant words (8 bytes)
                      NOTE: these are *not* typical Intel nomenclature sizes,
                            but they are consistent with GDB convention.
     f              Printing format.  one of
                      x Print in hexadecimal
                      d Print in decimal
                      u Print in unsigned decimal
                      o Print in octal
                      t Print in binary

    n, f, and u are optional parameters.  u and f default to the last values
    you used, or to w(words) and x(hex) if none have been supplied.
    n currently defaults to 1.  If none of these optional parameters are
    used, no slash should be typed.  addr is also optional.  If you don't
    specify it, it will be the value the next address (as if you had
    specified n+1 in the last x command).

  setpmem addr datasize val    Set physical memory location of size
                               datasize to value val.

  crc  addr1  addr2            Show CRC32 for physical memory range addr1..addr2

</screen>
</para>
</section>

<section>
<title>Info commands</title>
<para>
<screen>
  r|reg|regs|registers         List of CPU integer registers and their contents
  fp|fpu                       List of all FPU registers and their contents
  mmx                          List of all MMX registers and their contents
  sse|xmm                      List of all SSE registers and their contents
  ymm                          List of all AVX registers and their contents
  sreg                         Show segment registers and their contents
  dreg                         Show debug registers and their contents
  creg                         Show control registers and their contents

  info cpu                     List of all CPU registers and their contents
  info eflags                  Show decoded EFLAGS register
  info break                   Information about current breakpoint status
  info tab                     Show paging address translation
</screen>
</para>
</section>

<section>
<title>Manipulating CPU Registers</title>
<para>
<screen>
  set reg = expr    Change a CPU register to value of expression.
                    Currently only general purpose registers are supported,
                    you may not change:
                      eflags, eip, cs, ss, ds, es, fs, gs.

    Examples: set eax = 2+2/2
              set esi = 2*eax+ebx

  registers         List of CPU registers and their contents
  regs
  reg
  r
</screen>
</para>
</section>

<section>
<title>Disassembly commands</title>
<para>
<screen>
  disassemble start end       Disassemble instructions in given linear address
                              range, inclusive of start, exclusive of end.
                              Use "set $disassemble_size =" to tell
                              debugger desired segment size.  Use a value for
                              end of less than start (or zero) if you only
                              want the first instruction disassembled.

  disassemble switch-mode     Switch between Intel and AT&amp;T disassebly styles
                              for debugger disassembler.

  disassemble size = n        Tell debugger what segment size to use when
                              the "disassemble" command is used.  Use values
                              of 0, 16 or 32 for n.  Value of 0 means
			      "use segment size specified by current CS
			      segment". Default is 0.

  set $auto_disassemble = n   Cause debugger to disassemble current instruction
                              every time execution stops if n=1.  Default is 0.
                              Segment size of current CPU context is used for
                              disassembly, so the "disassemble size" variable is
                              ignored.

  set disassemble on          The same as 'set $auto_disassemble = 1'
  set disassemble off         The same as 'set $auto_disassemble = 0'
</screen>
</para>
</section>

<section>
<title>Instruction tracing</title>
<para>
<screen>
  trace on                    Disassemble every executed instruction. Note
                              that instructions which caused exceptions are
                              not really executed, and therefore not traced.

  trace off                   Disable instruction tracing.
</screen>
</para>
</section>

<section>
<title>Instrumentation</title>
<para>

To use instrumentation features in bochs, you must compile in support for it.
You should build a custom instrumentation library in a separate directory in
the "instrument/" directory.  To tell configure which instrumentation library
you want to use, use the "--enable-instrumentation" option.

The default library consists of a set of stubs, and the following are
equivalent:

<screen>
  ./configure [...] --enable-instrumentation
  ./configure [...] --enable-instrumentation="instrument/stubs"
</screen>

You could make a separate directory with your custom library,
for example "instrument/myinstrument", copy the contents of
the "instrument/stubs" directory to it, then customize it.  Use:

<screen>
  ./configure [...] --enable-instrumentation="instrument/myinstrument"
</screen>
</para>
</section>

<section>
<title>Instrumentation commands</title>
<para>
<screen>
  instrument [command]        calls BX_INSTR_DEBUG_CMD instrumentation callback with [command]
</screen>
</para>
</section>

<section>
<title>Other Commands</title>
<para>

<screen>ptime</screen>

Print the current time (number of ticks since start of simulation).

<screen>sb <varname>delta</varname></screen>

Insert a time break point "delta" instructions into the future ("delta" is a 64-bit integer followed by "L", for example 1000L).

<screen>sba <varname>time</varname></screen>

Insert a time break point at "time" ("time" is a 64-bit integer followed by "L", for example 1000L).

<screen>print-stack [<varname>num words</varname>]</screen>

Print the <varname>num words</varname> top 16-bit words on the stack. <varname>Num
words</varname> defaults to 16. Only works reliably in protected mode when
the base address of the stack segment is zero.

<screen>modebp</screen>

Toggles CPU mode switch breakpoint.

<screen>ldsym [global] <varname>filename</varname> [<varname>offset</varname>]</screen>

Load symbols from file <varname>filename</varname>. If the global keyword is
added, then the the symbols will be visible in all contexts for which
symbols have not been loaded. <varname>Offset</varname> (default is 0) is added to
every symbol entry. The symbols are loaded in the current (executing)
context.
</para>

<para>
The symbol file consists of zero or more lines of the format <screen>"%x %s"</screen>.

<screen>show [<varname>string</varname>]</screen>

<screen>
  Toggles show symbolic info (calls to begin with).
  show - shows current show mode
  show mode     - show, when processor switch mode
  show int      - show, when interrupt is happens
  show call     - show, when call is happens
  show ret      - show, when iret is happens
  show off      - toggles off symbolic info
  show dbg-all  - turn on all show flags
  show dbg-none - turn off all show flags
</screen>
</para>
</section>

<section>
<title>
Related links
</title>
<para>
&FIXME; add links
<itemizedlist>
<listitem> <para> Cosimulation </para> </listitem>
<listitem> <para> Instrumentation </para> </listitem>
</itemizedlist>
</para>
</section>
</section><!-- end: Using Bochs internal debugger -->

<section id="debugging-with-gdb">
<title>Using Bochs and the remote GDB stub</title>
<para>
This section covers how you can use Bochs with a remote GDB stub to debug your kernel.
</para>

<section>
<title>Configuring Bochs</title>
<para>
The GDB stub is not active in standard Bochs binary package.  So you must recompile Bochs.
Download the Bochs source package, unpack it and run the configure script
with the <command>--enable-gdb-stub</command> argument.

<screen>
  $ ./configure --enable-gdb-stub
</screen>

After that, just run make and you should have a Bochs binary that contain a GDB stub in your directory.
</para>
</section>

<section>
<title>Running Bochs</title>
<para>
Enable the <link linkend="bochsopt-gdbstub">gdbstub option</link> in <filename>bochsrc</filename>, then just start Bochs as normal. Bochs will stop and wait for GDB to connect to the stub.
</para>
</section>

<section>
<title>Running GDB</title>
<para>
Bochs GDB stub waits for a connection on TCP port 1234. Just start GDB like this:

<screen>
  $ gdb YOUR-KERNEL
  .
  .
  .
  (gdb) target remote localhost:1234
  Remote debugging using localhost:1234
  0x0000fff0 in ?? ()
  (gdb)
</screen>

You are now connected to the remote GDB stub in Bochs. You are now able to set breakpoints.
Use the continue (c) command to continue the simulation.

Hitting ^C works. Example:

<screen>
  Program received signal 0, Signal 0.
  syscall_testsuite_result (aux=0x1f11fe4) at ../rtmk/syscalls.c:33
  33     {
  (gdb)
</screen>
</para>
</section>

</section>

<section id="serial-port"><title>Using the serial port</title>
<para>
        This section describes what is possible to do with Bochs serial port emulation.
        These examples use dlxlinux disk image
        (downloaded from
        <ulink url="http://bochs.sourceforge.net/guestos/dlxlinux4.tar.gz">
        http://bochs.sourceforge.net/guestos/dlxlinux3.tar.gz</ulink>
        ) running as guest, on a debian x86 linux 2.4.19 host.
</para>
<para>
        For the examples to work in dlxlinux, after you login as root, you will need to
        kill the running gpm, as it grabs the serial port.
<screen>
Welcome to DLX V1.0 (C) 1995-96 Erich Boehm
                    (C) 1995    Hannes Boehm


dlx login: root
Linux 1.3.89.
dlx:~# ps | grep gpm
   30  S0 S     0:00 /usr/bin/gpm -t bare
   40   1 S     0:00 grep gpm
dlx:~# kill -9 30
dlx:~#
</screen>
</para>

        <section><title>Logging serial port output to a file</title>
        <para>
        The first example shows how to log information sent to the serial port
        on the guest system into a file on the host system.
        </para>
        <para>
        Update the com1: section of your configuration file:
        <screen>
com1: enabled=1, mode=file, dev=serial.txt
        </screen>
        After you've launch dlxlinux, everything sent to the serial port will be
        logged to serial.txt :
        <screen>
dlx:~# echo "logging to the serial port" > /dev/cua0
        </screen>
        <screen>
host$ cat serial.txt
logging to the serial port
host$
        </screen>
        </para>
        </section>
        <section><title>Interactivity : connecting to a virtual terminal</title>
        <para>
        The second example shows how to connect to the guest OS, using a
        virtual terminal on the host OS.
        </para>
        <para>
        First, you need to find an unused virtual terminal. Typically,
        X uses vt7; vt8 and up are unused. On my system, I can
        switch from X to vt9 by pressing ctrl-alt-f9 : this virtual
        terminal is not used, the screen is all black. Pressing alt-f7
        switches back to X.
        </para>
        <para>
        Once you found an unused vt, update the com1: section of your
        configuration file:
        <screen>
com1: enabled=1, mode=term, dev=/dev/tty9
        </screen>
        The number must be set according to the terminal you want to use (here 9).
        </para>
        <para>
        Now, launch dlxlinux. After you log in as root and kill gpm,
        enter the following command:
        <screen>
dlx:~# /sbin/agetty 38400 cua0
        </screen>
        If you switch to vt9, you can see dlx welcome banner, and the login prompt:
<screen>
Welcome to DLX V1.0 (C) 1995-96 Erich Boehm
                    (C) 1995    Hannes Boehm


dlx login:
</screen>
        Note that dlxlinux is configured so you can not login as root from a
        serial port. If you want to login, you have to create a new user first.
        </para>
        <para>
        Also, if you plan to use this feature, the best would be to deactivate
        gpm in /etc/rc.d/rc.local, and add a agetty line in /etc/inittab,
        for example:
<screen>
T0:1234:respawn:/bin/agetty 38400 cua0
</screen>
        </para>
        </section>
        <section><title>Interactivity : connecting to a pseudo terminal</title>
        <para>
        The third example is very similar to the second one, except that we
        connect to the guest OS with kermit as client, and we the connection
        is done through a pseudo terminal.
        </para>
        <para>
        This example uses /dev/ptyp0 and /dev/ttyp0 as pseudo terminal pair.
        We will tie Bochs to the controlling terminal, whereas kermit will
        use the slave terminal.
        </para>
        <para>
        Update the com1: section of your configuration file:
        <screen>
com1: enabled=1, mode=term, dev=/dev/ptyp0
        </screen>
        and lauch dlxlinux. After you log in as root, enter the command:
        <screen>
dlx:~# /sbin/agetty 38400 cua0
        </screen>
        Then in the host OS, launch kermit :
        <screen>
host$ kermit -l /dev/ttyp0
C-Kermit 7.0.196, 1 Jan 2000, for Linux
 Copyright (C) 1985, 2000,
  Trustees of Columbia University in the City of New York.
Type ? or HELP for help.
(/tmp/) C-Kermit>connect
Connecting to /dev/ttyp0, speed 0.
The escape character is Ctrl-\ (ASCII 28, FS)
Type the escape character followed by C to get back,
or followed by ? to see other options.
----------------------------------------------------

Welcome to DLX V1.0 (C) 1995-96 Erich Boehm
                    (C) 1995    Hannes Boehm


dlx login:
        </screen>
        The same comments as for example 2 apply here.
        </para>
        </section>
</section>

<section id="bios-tips">
<title>BIOS Tips</title>
        <section>
        <title>Booting from CD-ROMs</title>
        <para>
A bootable CD-ROM has a special layout that is detected by the
BIOS boot loader code, and executed if it conforms the specifications.
This layout is called "El Torito Bootable CD-ROM Format Specification"
and has been published by Phoenix and IBM. A copy of this spec is on
<ulink url="http://bochs.sourceforge.net/techdata.html">Bochs tech specs page</ulink>.
        </para>
        <para>
El Torito specifies 3 ways to have a bootable CD:
<itemizedlist>
<listitem>
<para>floppy emulation boot: A standard floppy image is burnt on the CD.
In this case the BIOS has to redirect all first floppy accesses to this
image and the real floppy drive becomes the second one.
</para></listitem>
<listitem><para>
a "no emulation" boot: In this case the BIOS is instructed to load an
arbitrary number of sectors straight into memory, and execute it.
</para></listitem>
<listitem><para>
hard disk emulation: A hard disk image is burnt on the CD. The
BIOS has to redirect all hard disk accesses to that image. The real hard disks
are still available, with BIOS numbers 81h and up.
</para></listitem>
</itemizedlist>

In Bochs 2.0, hard disk emulation is not implemented in the BIOS.
There are also subtilities about multiple boot-images CD-ROMs, that are
not handled by Bochs.
        </para>

        <para>
However, our BIOS may be more strict than real PC BIOSes, I don't know.
But I would definitely be interested to know of any CD that can boot
on real hardware, but does not in Bochs.
        </para>

        <para>
When failing to boot from CD-ROM, the BIOS outputs
the reason of the failure as
an error code, in the log file, and on the screen.
        </para>

        <para>
Here is a summary of what can happen when booting from the CD.
        </para>

<table><title>CD Boot error codes</title>

<tgroup cols="2" align="left" colsep="1" rowsep="1">
<thead>
 <row>
 <entry>Error code</entry>
 <entry>Reason</entry>
 </row>
</thead>
<tbody>
<row> <entry> 0x01 </entry> <entry> no atapi device found </entry> </row>
<row> <entry> 0x02 </entry> <entry> no atapi cdrom found </entry> </row>
<row> <entry> 0x03 </entry> <entry> can not read cd - BRVD </entry> </row>
<row> <entry> 0x04 </entry> <entry> cd is not eltorito (BRVD) </entry> </row>
<row> <entry> 0x05 </entry> <entry> cd is not eltorito (ISO TAG) </entry> </row>
<row> <entry> 0x06 </entry> <entry> cd is not eltorito (ELTORITO TAG) </entry> </row>
<row> <entry> 0x07 </entry> <entry> can not read cd - boot catalog </entry> </row>
<row> <entry> 0x08 </entry> <entry> boot catalog : bad header </entry> </row>
<row> <entry> 0x09 </entry> <entry> boot catalog : bad platform </entry> </row>
<row> <entry> 0x0A </entry> <entry> boot catalog : bad signature </entry> </row>
<row> <entry> 0x0B </entry> <entry> boot catalog : bootable flag not set </entry> </row>
<row> <entry> 0x0C </entry> <entry> can not read cd - boot image </entry> </row>
</tbody>
</tgroup>
</table>

<para>
<screen>
0x01 no atapi device found
0x02 no atapi cdrom found
</screen>

For the first two errors, an ata-*: type=cdrom is probably missing
from the configuration file. This is what you get if no cdrom has
been defined in Bochs conf file.
</para>

<para>
<screen>
0x03 can not read cd - BRVD
</screen>

For this error, the cdrom support has not been compiled in Bochs,
or Bochs could not open the file or device. This is what you get if
Bochs is not able to read the cd.
</para>

<para>
<screen>
0x04 cd is not eltorito (BRVD)
0x05 cd is not eltorito (ISO TAG)
0x06 cd is not eltorito (ELTORITO TAG)
</screen>

For these errors, the data has been read from the cd, but
the cd does not conform to the El Torito specification. This
is what you get if the cd is not bootable.
</para>

<para>
<screen>
0x08 boot catalog : bad header
0x09 boot catalog : bad platform
0x0A boot catalog : bad signature
0x0B boot catalog : bootable flag not set
</screen>

now the cd is eltorito, but the boot catalog is corrupted, or
the cd was made to boot on a ppc system. This should not happen
for a x86 bootable cd.
</para>

<para>
<screen>
0x07 can not read cd - boot catalog
0x0C can not read cd - boot image
</screen>
here, specific part of the cd could not be read. This should
definitely not happen.
</para>
        </section>

        <section id="bios-disk-translation">
        <title>Disk translation</title>
        <para>
Since the beginning of the PC era, disks have grown in size by a factor of 10000. Due to
differences between the ATA specification and BIOSes implementations, when disks reached
critical sizes, it
became necessary to translate the CHS geometry (cylinders, heads, sectors per track)
between the BIOS (int 13h) and the ATA interface. Please refer to the
<ulink url="http://burks.brighton.ac.uk/burks/pcinfo/hardware/atafaq/atafq.htm">ATA-FAQ</ulink>
and
<ulink url="http://www.ata-atapi.com/hiwchs.htm">Hale Landis' document</ulink>
for a complete discussion of the problem.
        </para>
        <para>
Unfortunately, there has never been any standard on the translation algorithms.
        </para>
        <para>
Bochs implements 4 well-known algorithms, selectable in the configuration file
in the "<command>ataX-xxxx: ..., translation='algorithm'</command>" section.
        </para>

<table><title>Disk translation algorithms</title>
<tgroup cols="4" align="left" colsep="1" rowsep="1">
<thead>
  <row>
    <entry>Algorithm</entry>
    <entry>Maximum disk size</entry>
    <entry>Maximum logical and physical geometry (CHS)</entry>
    <entry>Description</entry>
  </row>
</thead>
<tbody>
  <row>
    <entry>none</entry>
    <entry>528MB (1032192 sectors)</entry>
    <entry>
    LCHS:1024/16/63
    PCHS:1024/16/63
    </entry>
    <entry>
    no translation is done. The CHS received at the int13h interface
    is sent as is to the ATA interface.
    </entry>
  </row>
  <row>
    <entry>large</entry>
    <entry>4.2GB (8257536 sectors)</entry>
    <entry>
    LCHS:1024/128/63
    PCHS:8192/16/63
    </entry>
    <entry>
    a standard bitshift algorithm (named Extended-CHS)
    is used to translate the CHS between
    the int13h interface
    and the ATA interface. The translation is achieved by
    multiplying/dividing the cylinder/head count by a power of 2
    (2, 4 or 8).
    (a factor of 16 could not be used because the
    head count would become 256, and MS-DOS thought this was 0)
    Note that the number of sectors per track is not changed, so
    a lower spt value will lead to a lower maximum disk size.
    </entry>
  </row>
  <row>
    <entry>echs</entry>
    <entry> </entry>
    <entry> </entry>
    <entry>synonym for large</entry>
  </row>
  <row>
    <entry>rechs</entry>
    <entry>7.9GB (15482880 sectors)</entry>
    <entry>
    LCHS:1024/240/63
    PCHS:15360/16/63
    </entry>
    <entry>
    a revised bitshift algorithm (called Revised Extended-CHS)
    is used to translate the CHS between
    the int13h interface
    and the ATA interface. First the number of physical heads is forced to
    15, and the number of cylinders is adjusted accordingly.
    Then, as in the simple extended CHS algorithm, the translation
    is achieved by
    multiplying/dividing the cylinder/head count by a power of 2
    (2, 4, 8 or 16).
    The head count being forced to 15, it can safely be multiplied by 16
    without crashing dos.
    Note that the number of sectors per track is not changed, so
    a lower spt value will lead to a lower maximum disk size.
    </entry>
  </row>
  <row>
    <entry>lba</entry>
    <entry>8.4GB (16450560 sectors)</entry>
    <entry>
    LCHS:1024/255/63
    PCHS:16320/16/63
    </entry>
    <entry>
    a LBA-assisted algorithm
    is used to translate the CHS between
    the int13h interface
    and the ATA interface. The translation is achieved by
    first computing the physical size of the disk (LBA=C*H*S).
    Then the sectors per track is forced to 63, and the head count
    to 255. Then the cylinder count is computed (C=LBA/(63*255))
    Note that the number of sectors per track is forced to 63
    in the logical geometry, regardless of the actual geometry
    reported by the disk.
    Also note that the LBA-assisted algorithm has nothing to do with
    LBA access at the ATA interface.
    </entry>
  </row>
  <row>
    <entry>auto</entry>
    <entry> </entry>
    <entry> </entry>
    <entry>the best suited algorithm between none, large and lba is used</entry>
  </row>
</tbody>
</tgroup>
</table>

        <para>
Setting a specific CHS translation should be done if you use a disk dump
of an actual disk, or use a real disk as a block device. You need to
know which geometry was used to format the disk, and which translation
was used. You must not set the translation to 'auto'.
        </para>

        <note>
        <para>
rechs translation should only be useful for Compaq users who wants to
use a disk as a block device. Please report if you know any other
system that use such translation.
        </para>
        </note>

        <para>
If you plan to create a new disk image (for example with bximage),
format it and install an OS on it, select the "auto" translation
for an automatic selection
of the best algorithm based on the disk image size. Be warned that an image created
with the "auto" translation might not be readable with previous versions of Bochs.
Upward compatibility will be maintained.
        </para>

<note>
<para>
This translation applies only to int13h BIOS disk accesses. Older OSes (e.g. MS-DOS)
tend to use them a lot.  On modern OSes, disk accesses through BIOS int13h are
limited to boot loaders.
The usual rules and tricks of the installed OS still apply (ie 1024 cylinders boot limit).
</para>
</note>

        </section>
</section>

<section id="enter-special-keys"><title>How to enter special key combination</title>
<para>
Your window manager may trap the key combination you want to enter
in Bochs guest OS, for example <keycombo action="simul"><keycap>control</keycap><keycap>alt</keycap><keycap>delete</keycap></keycombo>. Here is a work-around:
</para>
<para>
Press and hold <keycombo action="simul"><keycap>control</keycap><keycap>alt</keycap></keycombo>,
move your mouse cursor outside of the Bochs window.  Release them, move
the cursor back in the Bochs window and press <keycap>delete</keycap>.
</para>
<para>
This should work for any key combination.
</para>
<para>
If you need one key combination frequently, set it up as <link linkend="bochsopt-user-shortcut">user key combination</link>
in your configuration file.  This key combination is sent to the guest OS
when you press the user button in the <link linkend="headerbar">headerbar</link>.
Depending on the used <link linkend="bochsopt-displaylibrary">display_library option</link>,
it may even be possible to edit the shortcut before sending it.
</para>
</section>

<section id="vesa-notes">
  <title>Notes about VESA usage</title>

  <para>
    Since Bochs 1.4 it is possible to use VESA graphics. There are some limitations in
    the current implementation, but in general it should work ok (we have run several test
    programs, the XFree86 VESA display driver, etc.)
  </para>

  <para>
    In order to use VESA VBE, you need to enable it in your <filename>bochsrc</filename> by setting the
    <link linkend="bochsopt-vga">vga option</link> to <parameter>vbe</parameter>.
    Finally, you need to use the
    <ulink url="http://savannah.nongnu.org/projects/vgabios/">LGPL'd VGABIOS</ulink>
    as <link linkend="bochsopt-vgaromimage">vgaromimage option</link> for
    applications to correctly detect VESA support.
  </para>

  <note><para>
    The VGABIOS is already included in the Bochs release, so no separate download is necessary.
  </para></note>

  <note><para>
    To take advantage of the VBE, you must tell Bochs to use the LGPL'd VGA BIOS
    version 0.4c or higher. A current version of the VGA BIOS will work.
  </para></note>

<para>
Current limitations:
<itemizedlist>
	<listitem> <para> 4bpp modes support is incomplete (8, 15, 16, 24 and 32bpp should work)</para> </listitem>
	<listitem> <para> banked mode is very slow (if you can, just use Linear Frame Buffering instead!) </para> </listitem>
	<listitem> <para> only 320x200, 640x400, 640x480, 800x600, 1024x768 are currently supported</para> </listitem>
</itemizedlist>
</para>

<para>
Interesting Facts:
<itemizedlist>
	<listitem> <para> You need a display driver capable of using the VESA BIOS for this to work
	                  (a recent XFree86 will do, Windows 9x/NT/2K/XP probably will not work 'out of the box'. </para> </listitem>
	<listitem> <para> Currently the VBE2 extension should be supported ok </para> </listitem>
</itemizedlist>
</para>

<section><title>Instructions to setup Bochs VBE in Windows Guest OS</title>
<para>This was contributed by Martin Bochnig in February 2004.</para>
<screen>
Instructions for Win95/98:
==========================
I can only confirm that SciTech finally made a VBE driver
for Windows. It works out of the box, at least with win95
as guest OS, provided you use Bochs 2.1 with the LGPL
vgabios.

Here is how I did it :
- install win95 with the vga driver.
- download sdd 7 beta from <ulink url="http://www.majorgeeks.com/download382.html"></ulink>
- download pmhelp.vxd from <ulink url="http://unununium.org/viewcvs/snap/redist/release/pmhelp.vxd"></ulink>
- copy pmhelp.vxd to the win95 system directory
- install sdd7

800x600 and 1024x768 in 16 and 24 bpp modes here.
I did not try 32bpp.

</screen>
<para>This was contributed by Stanislav Shwartsman in September 2004.</para>
<screen>
Instructions for Win2000/XP:
============================

Bochs VBE Display Drivers for Windows NT/2000
<ulink url="http://dhenriq.en.eresmas.com/"></ulink>
</screen>
</section>
</section>

<section id="cirrus-notes">
  <title>Notes about Cirrus SVGA usage</title>

  <para>
    Since Bochs 2.2 it is possible to use Cirrus SVGA graphics. The Cirrus device
    supports both ISA and PCI depending on the <filename>bochsrc</filename> settings.
    If PCI is disabled or the Cirrus card is not assigned to a PCI slot, it appears
    as a CL-GD5430 ISA with 2MB VRAM. If you assign the Cirrus card to a PCI slot,
    it appears as a CL-GD5446 PCI with 4MB VRAM.
  </para>
  <para>
    In order to use Cirrus SVGA, you need to compile Bochs using the <option>--enable-clgd54xx</option>
    option and enable it in your <filename>bochsrc</filename> by setting the
    <link linkend="bochsopt-vga">vga option</link> to <parameter>cirrus</parameter>.
    Finally, you need to use the Cirrus version of the
    <ulink url="http://savannah.nongnu.org/projects/vgabios/">LGPL'd VGABIOS</ulink>
    as <link linkend="bochsopt-vgaromimage">vgaromimage option</link> for
    applications to correctly detect Cirrus support.
  </para>
  <screen>
  # Enable CL-GD5446 PCI
  vga: extension=cirrus
  vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest-cirrus
  pci: enabled=1, chipset=i440fx, slot1=cirrus
  </screen>

  <note><para>
    The VGABIOS is already included in the Bochs release, so no separate download is necessary.
  </para></note>
</section>

<section id="harddisk-modes"><title>Disk Image Modes</title>
<para>
Bochs can handle independent disk image format for each
disk present on the ata interfaces.

The disk image type is selected in the configuration file
by the "mode" option of the ataX-xxx directives.
Example:

<screen>
ata0-master: type=disk, mode=flat, path=10M.sample, cylinders=306, heads=4, spt=17
</screen>
</para>

<note>
<para>
If unspecified, the default "mode" is flat.
</para>
</note>

<para>
<table><title>Supported Disk Modes</title>
<tgroup cols="3" align="left" colsep="1" rowsep="1">
<thead>
 <row>
  <entry>Name</entry>
  <entry>Description</entry>
  <entry>Features</entry>
 </row>
</thead>
<tbody>
 <row> <entry> flat </entry> <entry> one file, flat layout </entry>
       <entry>
       accessible with mtools or winimage-like tools
       </entry>
 </row>
 <row> <entry> concat </entry> <entry> multiple files, concatenated </entry>
       <entry>
       mappable to contained partitions
       </entry>
 </row>
 <row> <entry> external </entry> <entry> accessed through an external C++ class </entry>
       <entry>
       developer specific, needs a C++ class at compile time
       </entry>
 </row>
 <row> <entry> dll </entry> <entry> accessed through a DLL </entry>
       <entry>
       developer specific, windows only
       </entry>
 </row>
 <row> <entry> sparse </entry> <entry> up to 10 layers stackable files </entry>
       <entry>
       commitable, rollbackable, growing
       </entry>
 </row>
 <row> <entry> vmware3 </entry> <entry> vmware3 disk support </entry>
       <entry>
       vmware version 3 compatibility
       </entry>
 </row>
 <row> <entry> vmware4 </entry> <entry> vmware4 disk support </entry>
       <entry>
       vmware version 4 compatibility
       </entry>
 </row>
 <row> <entry> undoable </entry> <entry> flat file with a commitable redolog </entry>
       <entry>
       commitable, rollbackable
       </entry>
 </row>
 <row> <entry> growing </entry> <entry>  one growing file </entry>
       <entry> growing
       </entry>
 </row>
 <row> <entry> volatile </entry> <entry> flat file with a volatile redolog </entry>
       <entry>
       always rollbacked
       </entry>
 </row>
 <row> <entry> vvfat </entry> <entry> local directory appears as VFAT disk (with volatile redolog) </entry>
       <entry>
       optional commit or rollback
       </entry>
 </row>
</tbody>
</tgroup>
</table>
</para>

<section id="harddisk-mode-flat"><title>flat</title>
<para>
</para>
<section><title>description</title>
<para>
In flat mode, all sectors of the harddisk are stored in one flat file,
in lba order.
</para>
</section>
<section><title>image creation</title>
<para>
Flat disk images can be created with the bximage utility
(see <xref linkend="using-bximage"> for more information).
</para>
</section>
<section><title>path</title>
<para>
The "path" option of the ataX-xxx directive in the configuration file
must point to the flat image file.
</para>
</section>
<section id="harddisk-mode-flat-tools"><title>external tools</title>
<para>
Flat images content can be accessed from the host by the
following tools :
<itemizedlist>
<listitem> <para> mtools (see <xref linkend="mtools">)</para> </listitem>
<listitem> <para> mount with a loopback (see <xref linkend="loop-device-usage">) </para> </listitem>
<listitem> <para> Winimage / DiskExplorer (see <xref linkend="winimage">) </para> </listitem>
<listitem> <para> Bochs Tools (see <xref linkend="bochs-linux-disktools">) </para> </listitem>
</itemizedlist>
</para>
</section>
<section><title>typical use</title>
<para>
Flat mode is Bochs default harddisk layout. This is also
the layout of disk images provided on Bochs websites.
</para>
</section>
<section><title>limitations</title>
<para>
On some host OSes, Bochs flat disk images are limited to 2GiB.
</para>
</section>
</section>


<section><title>concat</title>
<para>
</para>
<section><title>description</title>
<para>
In concat mode, all sectors of the harddisk are stored in several flat files,
in lba order.
</para>
</section>
<section><title>image creation</title>
<para>
Disk images for the usage in 'concat' mode can be created with the bximage
utility (see <xref linkend="using-bximage"> for more information).
</para>
</section>
<section><title>path</title>
<para>
The "path" option of the ataX-xxx directive in the configuration file
must point to the first file (e.g. win95-1). The lower layer files names are
found by adding 1 to the last character (e.g. win95-2, win95-3, etc.).
</para>
</section>
<section><title>external tools</title>
<para>
If every single file contains a complete partition, they can be accessed
with same tools as the 'flat' mode images.
</para>
</section>
<section><title>typical use</title>
<para>
If the partition sizes and file sizes are set up correctly, this allows you to
store each partition in a separate file, which is very convenient if you want
to operate on a single partition (e.g. mount with loopback, create file system,
fsck, etc.).
</para>
</section>
<section><title>limitations</title>
<para>
On some host OSes, there is a limit of 2GiB per file.
</para>
</section>
</section>

<section><title>external/dll</title>
<para>
</para>
<section><title>description</title>
<para>
This mode is only useful for developers and needs an additional C++ class
compiled in, or an additional DLL linked to Bochs.
</para>
</section>
</section>

<section><title>sparse</title>
<para>
</para>
<section><title>description</title>
<para>
    Sparse disk support has been added by JustinSB. Sparse disk features are:
    <itemizedlist>
      <listitem>
        <para>
        Large hard drive can be created, and only used space will be stored
        in the file.  In practice, on Unix, this is not a large gain as it is
        done anyway.
        </para>
      </listitem>
      <listitem>
        <para>
        Multiple sparse drive images can be mounted on top of each other.
        Writes go to the top image.  This allows several similar configurations
        to share a master "base" file, and also allows file system rollback or
        no-write options.  Up to 10 disk images can be layered on top of each other.
        </para>
      </listitem>
    </itemizedlist>
</para>
</section>
<section><title>image creation</title>
<para>
Sparse disk images must be created with the bximage utility
(see <xref linkend="using-bximage"> for more information).
Be sure to enter "sparse" when selecting the image type.
</para>
</section>
<section><title>path</title>
<para>
The "path" option of the ataX-xxx directive in the configuration file
must point to the top layered file. The lower layer files names are found by
substracting 1 from the last character (must be a digit)
</para>
</section>
<section><title>external tools</title>
<para>
No external tool support Sparse disk images yet.
</para>
</section>
<section><title>typical use</title>
  <section>
  <title>Space Saving</title>
  <para>
    Create a sparse disk image using bximage.  Set size to eg 10GB.
    Only allocated space will be stored,
    so your drive image should be only about as large as the files stored on it.
  </para>
  </section>

  <section>
  <title>Disk Rollback</title>
  <para>
    <itemizedlist>
      <listitem>
        <para>
          Create a sparse disk image called "c.img.0".  Point .bochsrc at "c.img.0".
          In bochs, install your favorite OS.  Switch off bochs.
        </para>
      </listitem>
      <listitem>
        <para>
          Create a sparse disk image (of the same size)
          and name it "c.img.1".  Point .bochsrc at "c.img.1"
          "c.img.0" is visible, but all writes go to "c.img.1".
          After using bochs, you can simply delete
          "c.img.1" to undo changes and go back to a clean OS install.
        </para>
      </listitem>
    </itemizedlist>
  </para>
  </section>

  <section>
  <title>Disk Optional Commit</title>
  <para>
    <itemizedlist>
      <listitem>
        <para>
          Create a sparse disk image called "c.img.0".  Point .bochsrc at "c.img.0".
          In bochs, install your favorite OS.  Switch off bochs.
        </para>
      </listitem>
      <listitem>
        <para>
          Create a sparse disk image (of the same size) and name it "c.img.1".
          Point .bochsrc at "c.img.1"
          "c.img.0" is visible, but all writes go to "c.img.1".
          After using bochs, if you want to keep the
          changes, use the (currently non-existent) merge utility
          to make a single unified drive image.
        </para>
      </listitem>
      <listitem>
        <para>
          Alternatively simply create a new partition on top called "c.img.2".
        </para>
      </listitem>
    </itemizedlist>
  </para>
  </section>

  <section>
  <title>Common Base</title>
    <itemizedlist>
      <listitem>
        <para>
          Create a sparse disk image called "base.img".  Point .bochsrc at "base.img".
          In bochs, install your favorite OS.  Switch off bochs.
        </para>
      </listitem>
      <listitem>
        <para>
          Create a sparse disk image (of the same size) and name it "www.img.1".
          Make "wwww.img.0" a symlink to
          "base.img".  Point .bochsrc at "www.img.1". Using bochs, install a webserver.
        </para>
      </listitem>
      <listitem>
        <para>
          Create a symlink to "base.img" called "db.img.0".
          Create a sparse disk image (of the same size)
          and name it "db.img.1".  Point .bochsrc at "db.img.1".
          Using bochs, install a database server.
        </para>
      </listitem>
    </itemizedlist>

    <para>
     Now both a database server and webserver can be
     run in separate virtual machines, but they share the common OS image,
     saving drive space.
    </para>
  </section>

</section>
<section><title>limitations</title>
<para>
  There is a need for supporting utilities (yet unwritten) :
  <itemizedlist>
    <listitem>
    <para>to merge two sparse disk images into a single image </para>
    </listitem>
    <listitem>
    <para>to defragment a sparse disk image and remove unused space </para>
    </listitem>
  </itemizedlist>
</para>
</section>
</section>

<section><title>vmware3/vmware4</title>
<para>
</para>
<section><title>description</title>
<para>
Sharvil Nanavati has added vmware3/4 disk image support into Bochs
for Net Integration Technologies, Inc.
You should be able to use disk images created by vmware version 3 and 4.
</para>
</section>
<section><title>image creation</title>
<para>
Create such disk image with vmware version 3 or 4.
</para>
</section>
<section><title>path</title>
<para>
The "path" option of the ataX-xxx directive in the configuration file
must point to the vmware3/4 disk image.
</para>
</section>
<section><title>external tools</title>
<para>
&FIXME; give a look at vmware3/4 tools : disk image creation, etc.
</para>
</section>
<section><title>typical use</title>
<para>
If you want to use an existing vmware3/4 disk image.
</para>
</section>
<section><title>limitations</title>
<para>
Only vmware versions 3 and 4 disk image files are supported.
</para>
</section>
</section>

<section><title>undoable</title>
<para>
</para>
<section><title>description</title>
<para>
    Undoable disks are commitable/rollbackable disk images.
    An undoable disk is based on a read-only flat image
    (see <xref linkend="harddisk-mode-flat">), associated with
    a growing redolog, that contains all changes (writes)
    made to the flat image content.
</para>
<para>
    This redolog is dynamically created at runtime, if it does not
    previously exists.
</para>
<para>
    All writes go to the redolog, reads are done from the
    redolog if previously written, or from the flat file
    otherwise.
</para>
<para>
    If unspecified with the "journal" option of the ataX-xxx directive,
    the redolog file name is created by adding a ".redolog"
    suffix to the flat image name.
</para>
<para>
    File size of the redolog can grow up to the total disk
    size plus a small overhead due to internal data management
    (about 3% for a 32MiB disk,
    less than 0.5% for a 2GiB disk).
</para>
<para>
    After a run, the redolog will still be present, so the changes
    are still visible the next time you run Bochs with this disk image.
</para>
<para>
    After a run, the redolog can be committed (merged)
    to the flat image with the bxcommit utility.
</para>
<para>
    After a run, the redolog can be rollbacked (discarded)
    by simply deleting the redolog file.
</para>
<note>
<para>
    In this mode, the flat file is always open in read-only mode,
    so it can safely be stored on a read-only medium (for example on a cdrom).
</para>
</note>
</section>
<section><title>image creation</title>
<para>
The flat disk images must be created with the bximage utility
(see <xref linkend="using-bximage"> for more information).
    The growing redolog is created automatically if needed.
</para>
</section>
<section><title>path</title>
<para>
    The "path" option of the ataX-xxx directive in the configuration file
    must be the flat image name. The redolog name can be set with the "journal"
    option of the same directive.
    If not set, the redolog name is created by adding the
    ".redolog" suffix to the flat image name.
</para>
</section>
<section><title>external tools</title>
<para>
    See <xref linkend="harddisk-mode-flat-tools"> for tools
    to access the flat disk image content.
</para>
<note>
<para>
    The up-to-date content can only be seen after you commit the redolog
    to the flat file with the bxcommit utility.
</para>
</note>
</section>
<section><title>typical use</title>
<para>
&FIXME; to be completed
</para>
<section><title>Commit</title>
<para>
&FIXME; to be completed
</para>
</section>
<section><title>Rollback</title>
<para>
&FIXME; to be completed
</para>
</section>
<section><title>Common Base</title>
<para>
&FIXME; to be completed
</para>
</section>
<section><title>Harddisk Image on a Read-Only Medium</title>
<para>
&FIXME; to be completed
</para>
</section>
</section>
<section><title>limitations</title>
<para>
&FIXME; to be completed
</para>
</section>
</section>

<section><title>growing</title>
<para>
</para>
<section><title>description</title>
    <para>
    Growing disk images start as a small files, and
    grow whenever new data is written to them.
    </para>
    <para>
    Once a sector is
    written in the growing file, subsequent writes to the same
    sector will happen in place.
    </para>
    <para>
    File size of Growing disk images can go up to the total disk
    size plus a small overhead due to internal data management.
    (about 3% for a 32MiB disk,
    less than 0.5% for a 2GiB disk).
    </para>
</section>
<section><title>image creation</title>
<para>
Growing disk images must be created with the bximage utility
(see <xref linkend="using-bximage"> for more information).
Be sure to enter "growing" when selecting the image type.
</para>
</section>
<section><title>path</title>
<para>
    The "path" option of the ataX-xxx directive in the configuration file
    must be the growing image name.
</para>
</section>
<section><title>external tools</title>
<para>
No external tool support Growing disk images yet.
</para>
</section>
<section><title>typical use</title>
<para>
Growing disk images can be used whenever you want to maximize disk space.
However, please note that Bochs will not check if enough disk space is available
before writing new data. If no disk space is available, a panic will occur.
</para>
</section>
<section><title>limitations</title>
<para>
&FIXME; to be completed
</para>
</section>
</section>

<section><title>volatile</title>
<para>
</para>
<section><title>description</title>
<para>
    Volatile disks are always-rollbacked disk images.
    An volatile disk is based on a read-only flat image
    (see <xref linkend="harddisk-mode-flat">), associated with
    a growing temporary redolog, that contains all changes (writes)
    made to the flat image content. All data written to
    the  disk image are lost at the end of the Bochs
    session.
</para>
<para>
    The redolog is dynamically created at runtime, when
    Bochs starts, and is deleted when Bochs closes (win32)
    or just after it has been created (Unix).
</para>
<para>
    All writes go to the redolog, reads are done from the
    redolog if previously written, or from the flat file
    otherwise.
</para>
<para>
    If unspecified with the "journal" option of the ataX-xxx directive,
    the redolog file name is created by adding a ".redolog"
    suffix to the flat image name.
</para>
<para>
    File size of the redolog can grow up to the total disk
    size plus a small overhead due to internal data management
    (about 3% for a 32MiB disk,
    less than 0.5% for a 2GiB disk).
</para>
<para>
    After a run, the redolog is not any more present, so the changes
    are discarded.
</para>
<note>
<para>
    In this mode, the flat file is always open in read-only mode,
    so it can safely be stored on a read-only medium (for example on a cdrom).
</para>
</note>
</section>
<section><title>image creation</title>
<para>
The flat disk images must be created with the bximage utility
(see <xref linkend="using-bximage"> for more information).
    The growing redolog is created automatically.
</para>
</section>
<section><title>path</title>
<para>
    The "path" option of the ataX-xxx directive in the configuration file
    must be the flat image name. The redolog name can be set with the "journal"
    option of the same directive.
    If not set, the redolog name is created by adding the
    ".redolog" suffix to the flat image name.
    A random suffix is also appended to the redolog name.
</para>
</section>
<section><title>external tools</title>
<para>
    See <xref linkend="harddisk-mode-flat-tools"> for tools
    to access the flat disk image content.
</para>
</section>
<section><title>typical use</title>
<para>
&FIXME; can be completed
</para>
<section><title>Repeatable simulations</title>
<para>
&FIXME; to be completed
</para>
</section>
<section><title>Multiple Bochs instances</title>
<para>
&FIXME; to be completed
</para>
</section>
<section><title>Harddisk Image on a Read-Only Medium</title>
<para>
&FIXME; to be completed
</para>
</section>
</section>
<section><title>limitations</title>
<para>
&FIXME; to be completed
</para>
</section>
</section>

<section><title>vvfat</title>
<para>
</para>
<section><title>description</title>
<para>
    The "vvfat" disk image mode is mostly a port of Qemu's "virtual VFAT" block
    driver (written by Johannes E. Schindelin). It supports the read-only part
    of this implementation plus some additions. The structures of the
    virtual disk are created from the contents of the specified local directory
    when Bochs is starting. All writes to this virtual disk go to a volatile
    redolog and when closing Bochs, the user can decide whether or not to commit
    the changes. If "No" is seclected, all changes will be lost when Bochs quits
    and the files of the local directory are not modified. Otherwise the changes
    of files and directories are committed. WARNING: Don't use important data without
    backup in the "vvfat" directory when using this "optional commit" feature.
</para>
<para>
    In addition to Qemu's "vvfat" implementation the Bochs one supports configurable
    disk geometry, FAT32 and reading MBR and/or boot sector from file. When using
    the autodetection feature, the CHS values 1024/16/63 (Qemu defaults) are used.
    To use an MBR image file from a real disk it must be named <filename>vvfat_mbr.bin</filename>
    and placed in the specified directory. Bochs uses the geometry and file system
    type from this file and doesn't show it on the virtual disk. The same applies
    to a boot sector image file, but it must be named <filename>vvfat_boot.bin</filename>.
    Using both image file is also possible if they match (grabbed from the same disk).
</para>
<para>
    FAT32 is enabled for disk with minimum 2 GB size, or if MBR / boot sector image
    enable this filesystem. When using "vvfat" for a floppy, FAT12 is used (1.44M
    media only). In all other cases FAT16 is used. Long filename support
    is always present.
</para>
<para>
    Special FAT file attributes are stored in a special file named <filename>vvfat_attr.cfg</filename>.
    When using the "optional commit" feature, modified attributes are saved to this file.
    The "optional commit" also supports setting the file modification date and time.
</para>
</section>
<section><title>image creation</title>
<para>
    Not necessary. The directory must exist before running Bochs.
</para>
</section>
<section><title>path</title>
<para>
    The "path" option of the ataX-xxx directive in the configuration file
    must point to an existing local directory. The redolog name can be set
    with the "journal" option of the same directive. If not set, the redolog
    name is created by adding the filename "vvfat.dir.redolog" to the path.
    A random suffix is also appended to the redolog name.
</para>
</section>
<section><title>external tools</title>
<para>
    You can use your favourite file manager to copy file to the directory you'd
    like to use. The directory should not be modified while Bochs is running.
</para>
</section>
<section><title>typical use</title>
<para>
    Accessing files of the host hard drive is only possible with vvfat.
</para>
</section>
<section><title>limitations</title>
<para>
    There is no runtime write support present yet. All changes are written to
    the volatile redolog and they can only be committed on Bochs exit.
</para>
<para>
    When using the MBR from image file only the first partition is used and it
    must be of type FAT16 or FAT32. FAT12 can be used for the floppy only.
    An extended partition or other file system types are not supported.
</para>
</section>
</section>

<!--
<section><title>generic</title>
<para>
</para>
<section><title>description</title>
<para>
</para>
</section>
<section><title>image creation</title>
<para>
</para>
</section>
<section><title>path</title>
<para>
</para>
</section>
<section><title>external tools</title>
<para>
</para>
</section>
<section><title>typical use</title>
<para>
</para>
</section>
<section><title>limitations</title>
<para>
</para>
</section>
</section>
-->


</section>

<section id="using-bximage"><title>Using the bximage tool</title>
<para>
Bximage is an easy to use console based tool for creating disk images,
particularly for use with Bochs. It is completely  interactive if no command
line arguments are used. It can be switched to a non-interactive mode if all
required parameters are given in the command line.
</para>
<para>
When you run bximage without one of the following options,
it will  appear  in  interactive  mode and  ask   for  all
required parameters to create an image.
<screen>
-fd        Create a floppy image.
-hd        Create a hard disk image.
-mode=...  Image mode (for hard disks only - see the bochsrc sample for
           supported options).
-size=...  Image size in megabytes (e.g. 1.44 for floppy image, 10 for hard
           disk image).
-q         Quiet  mode (don't prompt for user input). Without this option bximage
           uses the command line parameters as defaults for the interactive mode.
           If this option is given and one of the required parameters is missing,
           bximage will fall back to interactive mode.
--help     Print  a  summary  of  the command line options for bximage and exit.

The filename parameter specifies the name of the image to be created.
</screen>
</para>
<para>
For an example of the usage, refer to <xref linkend="diskimagehowto">.
</para>
</section>

<section id="using-bxcommit"><title>Using the bxcommit tool</title>
<para>
This tool can commit redologs into flat images.
</para>
<para>
For now, only "undoable" redologs to flat image commits are supported.
Sparse disk image commits may be added in the future.
</para>
<para>
This tool is completely interactive, and does not need any command line parameter.
Bxcommit asks for the flat image name, the redolog name, and whether to remove
to redolog file after it commits it.
</para>
<para>
Session example :
<screen>
$ ./bxcommit
========================================================================
                               bxcommit
              Undoable Disk Image Commit Tool for Bochs
========================================================================

What is the flat image name?
[c.img] myfile.img

What is the redolog name?
[myfile.img.redolog] toapply.redolog

Shall I remove the redolog afterwards?
[yes]
</screen>
</para>
</section>

</chapter>



<chapter id="guests"><title>Guest operating systems</title>
<para>
In the past several tweaks were necessary to install a guest OS inside of Bochs.
Nowadays it's almost the same as installing it on a real machine. There are only
a few Bochs specific issues you should know about. Note that we cannot give you
a full installation guide if you don't know how to install an OS in the real
world. The following remarks apply to all guest OS installations. Some specific
issues are reported in the next sections.
<itemizedlist>
<listitem><para>
First of all you need the installation media or image (floppy/CD/DVD).
For platforms that don't support raw device access it might be necessary to
create an image from the media. You must read the message regarding software
licenses in <xref linkend="thirdparty"> before you install or use a commercial
guest operating system in Bochs.
</para></listitem>
<listitem><para>Then you need to create a hard drive image with bximage. For the
required size see the documentation of the OS you'd like to install. See
<xref linkend="using-bximage"> how to create the image.
</para></listitem>
<listitem><para>Finally you have to create configuration for your guest OS. You can
edit the sample configuration distributed with Bochs or use the configuration
interface to adjust the settings. Check the documentation of your guest OS for
the required memory size, cpu speed and supported hardware.
</para></listitem>
</itemizedlist>
Now you should be able to run Bochs and start the installation process. Depending
on the host cpu speed and the size of the guest OS it can take a few minutes or
even some hours.
</para>
<para>
<screen>
What disk images are available.
What works
Known problems
</screen>
</para>

<section id="guest-knoppix">
  <title>Knoppix</title>

  <para>
    Contributed by Alexander Schuch.
  </para>

  <section>
    <title>Getting Knoppix</title>

    <para>
      Knoppix is a live CD (700M) or live DVD (3.2G) based on Debian GNU/Linux, with lots of
      ready-to-run programs (web browser, office suite, a few games, and more), using
      <abbrev>KDE</abbrev> as desktop environment. It can be booted directly from CD, without
      any installation needed. You can download it from <ulink url="http://www.knoppix.org/">knoppix.org</ulink>.
    </para>
  </section>

  <section>
    <title>Preparing Bochs</title>

    <para>
      As Knoppix runs completely from CD/DVD, you don't need to setup a hard disk. You just need to set up
      the location of the downloaded ISO image in your <filename>bochsrc</filename>, and make Bochs boot
      from it. Because Knoppix contains a graphical user interface, and has no other storage space but
      the emulated RAM, it needs at least 128MB of it, see
      <link linkend="bochsopt-megs">megs option</link>. Furthermore, you need to enable VBE support in
      Bochs (see <xref linkend="vesa-notes">).
    </para>
  </section>

  <section>
    <title>Using Knoppix</title>

    <para>
      There is nothing more to do! Just start Bochs and wait for Knoppix to load...
    </para>

    <note><para>
      You are logged in as normal user, if you want to become super user, just <command>su</command>.
      There is no password needed (empty password).
    </para></note>
  </section>
</section>

<section id="guest-freebsd">
<!--
  <sectioninfo>
    <authorgroup>
      <author>
        <firstname>Alexander</firstname>
        <surname>Schuch</surname>
        <contrib>Contributed by </contrib>
      </author>
    </authorgroup>
  </sectioninfo>
-->
  <title>FreeBSD 5.2.1</title>

  <para>
    Contributed by Alexander Schuch.
  </para>

  <para>
    This section describes how to install FreeBSD 5.2.1 (miniinst) inside of Bochs, using an ISO image.
  </para>

  <section>
    <title>Getting FreeBSD</title>

    <para>
      As <filename>5.2.1-RELEASE-i386-miniinst.iso</filename> (240M) is no longer available from
      the FreeBSD FTP server, you might want to ask a (file) search engine of your choice
      for a download location. Once you downloaded the file, you should check its integrity
      using the provided MD5 checksum from the
      <ulink url="http://www.freebsd.org/releases/5.2.1R/announce.html">FreeBSD 5.2.1 release announcement</ulink>.
    </para>
  </section>

  <section>
    <title>Preparing Bochs</title>

    <para>
      Create a new hard disk image using <command>bximage</command> (see
      <xref linkend="using-bximage">) with a size of at least 350M, as the standard
      installation uses 280M on its own.
    </para>

    <para>
      Next, you need to setup your <filename>bochsrc</filename> so that Bochs knows about your
     (still empty) hard disk, as well as about your ISO image. Make Bochs boot from CD-ROM and
     start the emulation.
    </para>
  </section>

  <section>
    <title>Installing FreeBSD</title>

    <para>
      This is just a very short step-by-step installation guide for FreeBSD in Bochs. It
      doesn't explain what you do nor why you do it, it just tells you how to do it.
      For in-deepth information refer to the FreeBSD handbook:
      <ulink url="http://www.freebsd.org/doc/handbook/install.html">Installing FreeBSD</ulink>.
    </para>

    <para>
      FreeBSD boots up and shows a nice (text-mode) boot option screen. Just press
      <keycap>return</keycap> there, that is, use the default option. After loading the
      kernel and needed device drivers, select 'Standard' in the installation menu.
    </para>

    <para>
      A fdisk like partition program is loaded next, where you just press <keycap>A</keycap>
      to use the entire disk, followed by <keycap>Q</keycap> to finish the selection. The next
      dialog asks for the boot manager you want to use. Select 'Standard' and continue.
    </para>

    <para>
      In the Disklabel Editor, you have to setup the layout of your partition. If your (virtual)
      hard disk is large enough, you can press <keycap>A</keycap> for auto-layout. However, you
      need to make sure that the <filename class="directory">/usr</filename> partition is at least
      250M large, or you will end up with a 'disk full' error message during installation. If
      this is not the case, select one partition after another and press <keycap>D</keycap> to
      delete it again. After you deleted all partitions, create two new ones. The first one will
      be a swap partition; press <keycap>C</keycap>, enter '32M' as size and select 'Swap' from
      the dialog. Press <keycap>C</keycap> again, and accept the remaining capacity for your
      filesystem partition. Choose 'FS' as partition type and enter '/' (slash) as mount point.
      Your partition layout is complete now; press <keycap>Q</keycap> to leave the editor.

      <note><para>
        This 'all-in-one' partition layout is not recommended for a FreeBSD installation on a
        real box; use 'auto-layout' or something comparable to that there.
      </para></note>
    </para>

    <para>
      You now can choose what set of programs/files (distribution) you want to install. Take
      'User' (option 8), and select 'No' when asked to install the ports collection. You are
      back in the distribution selection, where you select the first item, called 'Exit'.
      Choose to install from 'CD/DVD' and answer the 'Are you sure?' dialog with 'yes'.
    </para>

    <para>
      Now, while FreeBSD installs, it is a very good time to take a look at the
      <ulink url="http://www.freebsd.org/docs.html">FreeBSD documentation</ulink>, especially
      the <ulink url="http://www.freebsd.org/doc/handbook/index.html">FreeBSD handbook</ulink>
      and the <ulink url="http://www.freebsd.org/doc/faq/index.html">FreeBSD FAQ</ulink>.
    </para>
  </section>

  <section>
    <title>Post-installation configuration</title>

    <para>
      All files are installed on your (virtual) hard disk now, and FreeBSD is ready for getting set
      up. As this is a very basic FreeBSD installation, you just answer 'no' to nearly all questions,
      but the one about your mouse: Answer 'yes' for PS/2 mouse, and choose 'Exit' at mouse configuration.
      The miniinst FreeBSD ISO image contains nearly no binary packages, so don't browse the package
      collection. Then, when asked to create a new user account, answer 'yes' and create a new user
      called 'bochs' (or whatever you like). You might want to use <filename>/bin/csh</filename>
      or <filename>/bin/tcsh</filename> as shell rather than <filename>/bin/sh</filename>. Next,
      you are asked for the super user (root) password. The installation is finished now, there is
      no need to visit the general configuration menu again - answer 'no' to that question. FreeBSD
      will then reboot. Shutdown Bochs, as soon as the (virtual) computer boots.
    </para>
  </section>

  <section>
    <title>Using FreeBSD</title>

    <para>
      Open your <filename>bochsrc</filename> and change the boot sequence, so that Bochs will boot
      from hard disk, rather than from CD-ROM from now on. Start Bochs again and watch the FreeBSD
      boot process.
    </para>

    <para>
      Your keyboard might use the wrong keymap, so login (into FreeBSD) as super user and use
      <command>/stand/sysinstall</command> to start the FreeBSD configuration program. Choose
      'keymap' and select the keymap you want to use.
    </para>

    <para>
      You have successfully installed FreeBSD now. You might want to shutdown FreeBSD using
      <command>shutdown -h now</command>, quit Bochs, and create a backup of your hard disk
      image, before you start playing around.
    </para>
  </section>
</section>

 <section id="guest-dos"><title>DOS</title>
<para>You must read the message regarding software licenses in
<xref linkend="thirdparty"> before you install or use MS-DOS, OS/2, DR-DOS, or any other DOS as a guest operating system in Bochs.</para>
<section><title>Accessing your CDROM</title>
<para>
To access your CDROM in DOS, you must download an IDE CDROM driver.
Bochs emulates a very generic CDROM drive, and several drivers are known to
work.  Others don't.  This section describes how to set up your
<filename>config.sys</filename> and <filename>autoexec.bat</filename> to enable
the CDROM.
</para>

<para>
The drivers that have been reported to work are
<filename>OAKCDROM.SYS</filename> that comes with several versions of Windows
and <filename>SBIDE.SYS</filename> version 1.21 from Creative
Labs<footnote>
<para>
To get it, go to <ulink url="http://creative.com">Creative Labs web
site</ulink>, click on Support, then click Download Files.  You get to a screen
where you must select the operating system and the product for which you want
the driver.  Choose DOS as the operating system, and "CD-ROM: 4x and above" as
the product.  There are several choices, but you want
<filename>sbide121.exe</filename> from April 15, 1997.  Version 2.0 does not
work.  The download file is a self-extracting ZIP file, so on
DOS or Windows you just run it; on other platforms you can try using
the unzip command.  The driver is called SBIDE.SYS.  </para>
</footnote> and OAKCDROM.SYS that comes with several versions of Windows.
Copy the driver to your boot disk, and then set up the startup files as follows.
</para>
<screen>
config.sys:
  device=himem.sys
  device=oakcdrom.sys /D:CD001
      -or-
  device=sbide.sys /D:CD001 /P:1f0,14,3f6

autoexec.bat:
  mscdex.exe /M:10 /D:CD001
</screen>

<para>
If the files mentioned in <filename>config.sys</filename> and
<filename>autoexec.bat</filename> are not in the root directory, give the full
pathname, like <filename>c:\windows\himem.sys</filename>.
</para>

</section>
<section><title>SB16 driver for DOS</title>
<para>
To use the SB16 device in DOS you need to load a driver for it. The file <filename>
SBBASIC.EXE</filename> contains a self-extracting archive with all required file.
After unpacking it to <varname>C:\SB16</varname> you can execute <filename>INSTALL.EXE</filename>
to install the driver. The file <filename>DISK.ID</filename> should contain the version
string <varname>SDR-31STD-1-US (Revision 1)</varname>.
</para>
</section>
<section><title>Bootdisks of early DOS versions</title>
<para>
On the Web there are bootdisks available for most of the DOS versions ever released,
but some of them have been reported to fail in Bochs. The bootdisk for MS-DOS 1.25
contains a boot sector of a newer DOS version, so it would fail on real hardware,
too. The floppy image for MS-DOS 2.11 has a boot sector that tries to boot from
hard disk instead of the floppy.
</para>
</section>
</section>

<section id="guest-winnt4">
        <title>Windows NT 4.0</title>
<para>
You must read the message regarding software licenses in
<xref linkend="thirdparty"> before you install Windows NT 4.0 as a guest operating system in Bochs.
</para>
<para>
Here are the known issues about installing and running Windows NT4.0 :
</para>
<itemizedlist>
<listitem>
<para>
If you want to use the LGPL'd VGABIOS to install Windows NT 4.0 you'll need
version 0.4c or higher. With older versions you'll get a black screen after
first reboot.
</para>
</listitem>
<listitem>
<para>
to log in you must press ctrl-alt-del, and it is likely that the window manager
will trap this key combination. You can either use the trick described in
<xref linkend="enter-special-keys"> or define a user short-cut
(callable through the user short-cut gui button)
in you configuration file, for example:
<programlisting>
user_shortcut: keys=ctrl-alt-del
</programlisting>
</para>
</listitem>
<listitem>
<para>
For installing and using Windows NT it is necessary to limit the maximum CPUID
to 3. In the configuration file you need to add a line like this:
<programlisting>
cpuid: cpuid_limit_winnt=1
</programlisting>
</para>
</listitem>
</itemizedlist>
</section>

<section id="guest-win2k">
        <title>Windows 2000</title>
<para>You must read the message regarding software licenses in
<xref linkend="thirdparty"> before you install Windows 2000 as a guest operating system in Bochs.</para>
        <para>
        </para>

</section>
<section id="guest-win2k-server">
<title>Windows 2000 Server</title>
<para>You must read the message regarding software licenses in
<xref linkend="thirdparty"> before you install Windows 2000 Server as a guest operating system in Bochs.</para>
</section>

<section id="guest-winxp">
        <title>Windows XP</title>
<para>You must read the message regarding software licenses in
<xref linkend="thirdparty"> before you install Windows XP as a guest operating system in Bochs.</para>
        <para>
        Windows XP has been reported to install from the CDROM, and run inside Bochs.
        The only known issue is to set the IPS to, at least, a value of 10000000.
        </para>
</section>


<section id="guest-osr5">
<title>SCO OpenServer 5.0.5</title>
<para>
Contributed by Carl Sopchak
</para>

<para>
You must read the message regarding software licenses in
<xref linkend="thirdparty"> before you install SCO OpenServer 5.0.5 as a guest operating system in Bochs.
</para>

<para>
Back in April and May of 2002, I did some work on Bochs
in order to get it to install and boot SCO's OpenServer 5.0.5 (OSR5).
Since that time, I have had several e-mails asking about this error message
or that.  The newsgroup posts done at the time had all of the information that I knew,
so I pointed people there.  (I had not used Bochs since...)
In February of 2003, I got another such e-mail.
Since the sender indicated they were willing to pay me to get this going for them,
I agreed to spend a few hours on it (for free, which is not common :-}).  Subsequently,
I decided to document this once and for all.  (I did not charge anyone anything, this time...)
</para>

<para>
Note: These steps were originally used with Bochs 1.4.1 (or thereabouts,
since I was using CVS heavily at the time).  It is possible (likely) that later versions of Bochs
are more tolerant/bug free, and this install may be abbreviated.  However, I have not tried
to streamline it at all.
</para>

<para>
These steps were performed and confirmed using Bochs version 2.0.2, and SCO OpenServer version 5.0.5.
The host OS was Red Hat Linux 8.0.
</para>

<para>
First, I downloaded the tarball, and extracted the source tree.  I decided to use the tarball
instead of the RPM so that I knew what options were compiled in, etc.
<screen>
linux-$ tar -xzvf bochs-2.0.2.tar.gz
</screen>
</para>

<para>
Next, I configured and compiled Bochs...
<screen>
linux-$ cd bochs-2.0.2
linux-$ ./configure --enable-cdrom --enable-ne2000
linux-$ make
</screen>
</para>

<para>
I then created my disk image:
<screen>
linux-$ ./bximage
========================================================================
                                bximage
                  Disk Image Creation Tool for Bochs
========================================================================

Do you want to create a floppy disk image or a hard disk image?
Please type hd or fd. [hd] hd

What kind of image should I create?
Please type flat, sparse or growing. [flat]

Enter the hard disk size in megabytes, between 1 and 32255
[10] 2048

I will create a hard disk image with
  cyl=4161
  heads=16
  sectors per track=63
  total sectors=4194288
  total size=2047.99 megabytes

What should I name the image?
[c.img] hd0.img

Writing: [] Done.

I wrote 2147475456 bytes to hd0.img.

The following line should appear in your .bochsrc:
  ata0-master: type=disk, path="hd0.img", cylinders=4161, heads=16, spt=63
</screen>
</para>

<para>
I then created my .bochsrc file.  I did this via the interactive portion of Bochs, with the
end result as follows:
<programlisting>
floppya: 1_44="/dev/fd0", status=inserted
floppyb: 1_44="b.img", status=inserted
ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
ata0-master: type=disk, path="hd0.img", cylinders=4161, heads=16, spt=63, translation=auto, biosdetect=auto, model="Generic 1234"
ata0-slave: type=cdrom, path="/dev/cdrom", status=inserted, biosdetect=auto, model="Generic 1234"
ata1: enabled=0
ata2: enabled=0
ata3: enabled=0
romimage: file=bios/BIOS-bochs-latest
vgaromimage: file=bios/VGABIOS-lgpl-latest
megs: 64
parport1: enabled=1, file="lp.pipe"
com1: enabled=0
# no sb16
boot: cdrom
floppy_bootsig_check: disabled=0
vga: update_freq=5
keyboard_serial_delay: 250
keyboard_paste_delay: 100000
cpu: ips=3000000
clock: sync=realtime, time0=0
mouse: enabled=0
private_colormap: enabled=0
pci: enabled=0
# no ne2k
# no loader
log: osr5.log
logprefix: %t-%e-%i%d
debugger_log: -
panic: action=ask
error: action=report
info: action=report
debug: action=ignore
keyboard_mapping: enabled=0, map=
keyboard_type: mf
user_shortcut: keys=none
config_interface: textconfig
display_library: x
</programlisting>
Some important things to note are that you want to boot from the cdrom, and you do NOT want the ne2000
card configured initially.  (We'll add that later...)
</para>

<para>
At this point, Bochs is ready to roll!  Insert the OSR5 install CD into the drive, and start Bochs.
You should soon see the SCO "boot:" prompt:
<screen>
SCO OpenServer(TM) Release 5

boot
: defbootstr disable=fdi,dptr
</screen>

Note the disable= parameter that you need.  These two SCO drivers cause the install to fail, so they
need to be disabled for the install boot.  You will not need this once OSR5 is installed.
</para>

<para>
During the install of OSR5, there are two default configuration answers that need to be changed.
For the hard disk setup, you should turn bad tracking off, since it's unnecessary on an emulated disk.
(It won't hurt to do it, it will just take a VERY long time!)
For the network setup, change the network card to Deferred.  You can change other settings, if you so
desire.  However, I would do the initial install with as little configured as you can get away with, then
add whatever else is needed (one step at a time) after the initial install completes.
</para>

<para>
Let the install copy the files.  Go get lunch.  Take a nap.  Go have dinner...
This can take a LONG time.  On my Pentium 4 1.7GHz system, this
step took just over eight hours!  (BTW, it was MUCH longer in version 1.4.1.  Great job, guys!)
</para>

<para>
After the install finishes, you will need to change the following lines in .bochsrc file:
<programlisting>
ne2k: ioaddr=0x300, irq=10, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
boot: disk
</programlisting>
Obviously, if you're not using Linux, the ethmode and ethdev values on the ne2k line will be different.
Also, since Bochs uses "raw" network card access, you'll have to "setuid root" on the Bochs executable:
<screen>
linux-$ chown root bochs
linux-$ chmod u+s bochs
</screen>
(If there is a way to give a "normal user" CAP_NET_RAW capability, that would be an alternative.
I don't know how to do that...)
Restart Bochs.  Now, you can just press Enter at the OSR5 boot: prompt, because the offending
drivers have been linked out of the kernel.
</para>

<para>
Before you configure the network card,  I'd strongly suggest getting the latest "nat" driver from SCO.
Version 5.0.5b of this driver, according to the SCO web site, "correct[s] possible system lockup
under high load due to internal buffer overflow."  The driver can be found
<ulink url="ftp://ftp.caldera.com/pub/openserver5/drivers/OSR505/network/nat">here</ulink>.
To get the Disk Image file into SCO, I downloaded the VOL.000.000 file to my linux box,
and used tar to get it on to a floppy:
<screen>
linux-$ tar -cvf /dev/fd0 VOL.000.000
</screen>
I then used tar within OSR5 to move it from the floppy to the /tmp directory:
<screen>
osr5-# cd /tmp
osr5-# tar -xvf /dev/fd0135ds18
</screen>
You can then use 'custom' to install the driver from the image file.
You will then want to use 'scoadmin network' to configure the network card.  Choose
the Novell NE2000 card, and set the parameters to match the ne2k: line in the .bochsrc file.
DO NOT have OSR5 look for the card, as Bochs may likely crash. (It did in version 1.4.1.)
</para>

<para>
You can also configure a printer, if you want.  Using the spoolpipe utility that I wrote
(which can be found in Bochs' misc directory), you can print from OSR5 through the parallel
port, and you'll hardly notice
that the printing is going through an extra layer of operating system!
(You could also set up a printer using network printing, if the printer is not on the host machine...)
</para>

<para>
Obviously, dont forget to apply the release supplements and other patches that are considered
"must haves" for OSR5: rs505a, oss600a, oss497b (others?).
</para>

<para>
That's about as far as I have got.  I played around with OSR5 within Bochs a bit, but I
can by no means say that I did any kind of real testing, let alone exhaustive testing.
</para>

<para>
And of course, YMMV!  :-)
</para>

</section>

</chapter>


</book>