Bochs/bochs/CHANGES

Changes in 2.1 (October 2, 2003):

- Stanislav's changes...
  --------------------------------------------------------------------------
- CPU
  - added emulation of AMD 3DNow! instructions set.
  - added emulation of SSE/SSE2 floating point instructions.
  - added P4 CPU support to CPUID instruction.
  - fixed implementation of FXSAVE/FXRSTOR instructions.
  - bugfix: unallowed lock prefix cases must cause #UD exception.
  - fixed fetchdecode bug caused #UD in SYSENTER/SYSEXIT instructions
    in 32bit mode.
  - fixed fetchdecode64 bug caused wrong decoding of opcodes containing
    BxImmediate_IvIw or BxImmediate_IwIb in x86-64.
  - fixed bug in int01 (opcode 0xF1) emulation. (Vitaly Vorobyov)
  - fixed bug in x86 debugger with dr0-dr3 registers (Vitaly Vorobyov)
  - fixed bug with mov to/from dr register in v86mode.
    (now exception is generated (according to Intel documentation)
    instead of panic) (Vitaly Vorobyov)
  - fixed stack limit checking, now message is generated as BX_DEBUG,
    rather then BX_PANIC, and exception code is executed. (Vitaly Vorobyov)
  - instrumentation code updated.

- FPU
  - hundreds of bugfixes in FPU emulation after checking of the emulation
    with testfloat (Scott Duplichan).
    - Fixed cases:
        - floatx80_to_int32,   floatx80_to_float32
        - floatx80_to_float64, floatx80_round_to_int
        - floatx80_add,        floatx80_sub, 
        - floatx80_mul,        floatx80_div
  - 64-bit addressing support for x86-64 mode (Christophe Bothamy)
  - implemented FCMOVcc instructions

More Details:

[+] Added emulation of AMD 3DNow! instructions set.

  Bochs now could decode all AMD 3DNow! instructions. 
  Most of instructions still not implemented, but the basis already presents.
  Configure --enable-3dnow to enable 3DNow! support.

  TODO: 

     Close all still not implemented instructions:

	PFPNACC_PqQq, PF2IW_PqQq, PFNACC_PqQq, PFCMPGE_PqQq, PFMIN_PqQq,
	PFRCP_PqQq, PFRSQRT_PqQq, PFSUB_PqQq, PFADD_PqQq, PFCMPGT_PqQq,
	PFMAX_PqQq, PFRCPIT1_PqQq, PFRSQIT1_PqQq, PFSUBR_PqQq, PFACC_PqQq,
	PFCMPEQ_PqQq, PFMUL_PqQq, PFRCPIT2_PqQq
 
     CPUID still could not report 3DNow! instruction set.

[+] Added emulation of SSE/SSE2 floating point instructions

  Alsmost all SSE/SSE2 floating point instructions are fully implemented 
  using free softfloat library (including DAZ support and floating point
  exceptions).  Correctness of the emulation checked with heavily random 
  testing. 

  Currently only 2 SSE2 opcodes still not implemented:

	RSQRTSS_VssWss, RSQRTPS_VpsWps

[+] Added emulation of SSE3 (PNI) instructions

  Currently only 3 PNI opcodes still not implemented:

	FISTTP m16int, FISTTP m32int, FISTTP m64int

Patches applied:

- applied disassembler fixes for by Dirk Thierbach
- applied FPU 64-bit addressing patch
- applied CPU fixes patch by Vitaly Vorobyov
 [x] fixed bug in int01 (opcode 0xF1) emulation
 [x] fixed bug in x86 debugger with dr0-dr3 registers
 [x] fixed bug with mov to/from dr register in v86mode 
     (now exception is generated (according to Intel documentation)
     instead of panic)
 [x] fixed stack limit checking, now message is generated as BX_DEBUG,
     rather then BX_PANIC, and exception code is executed
  --------------------------------------------------------------------------

- Christophe's changes...
  --------------------------------------------------------------------------
- cpu
  - fix flaw in IO bitmap permission of TSS
  - cpu resets on triple fault
- I/O devices
  - harddisks 
    - per device selectable Harddisk modes :
      - undoable, volatile, growing disks support
      - sparse disks support (contributed by justinSB)
      - vmware3 disks support (contributed by Sharvil Nanavati)
    - fix non detection of hard drives by minix2
    - implement atapi command 0xA8 read (12)
    - mode sense command updated (contributed by Hartmut Birr)
  - sb16 
    - opl2 support enhanced (contributed by James E. Flemer)
  - ne2k
    - tap support for FreeBSD (contributed by Ronald Klop and Gen Otsuji)
    - fix when booting with grub (contributed by Keir Fraser)
  - add experimental PCI VGA card (contributed by Mike Nordell)
  - include slowdown timer as a runtime option
- display libraries
  - X11
    - onboard vgacard charmap usage (no need for external X11 vga font any more)
    - vgacard charmap change support
    - fix black stripes on partial exposes (contributed by Dirk Thierbach)
    - headerbar redraw optimizations (contributed by Dirk Thierbach)
- support tools
  - bximage : added support for 
    - growing disks
    - sparse disks (contributed by justinSB)
  - created bxcommit tool for undoable disk images
- Rombios :
  - fixed int15 function e801 (get memory size)
  - added int75_handler for FPU Dos Exceptions
  - added support for ElTorito Harddisk emulation
- MacOS port
  - small configure fixes
- documentation
  - user documentation updated and extended :
    - disk modes
    - LBA translation 
    - cdboot error codes
    - SCO OpenServer install section (contributed by Carl Sopchak)
    - MacOS-X DMG install guide (contributed by Aard Vark)
    - update Win98 install guide (contributed by Dirk Thierbach)
  --------------------------------------------------------------------------

- Volker's changes...
  --------------------------------------------------------------------------
- I/O devices
  - general
    - i/o access mask implemented, unallowed cases are now handled in the devices
      code and cause a BX_ERROR
  - vga
    - color depth 15, 16, 24 and 32 bpp supported by VBE (based on a patch from
      Christopher Nelson for 32 bpp on win32). Supported by sdl, x, win32 and wx.
    - SVGA mode 0x6A (800x600x4bpp) implemented
    - new CGA graphics modes 640x200x1bpp and 160x100x4bpp (text mode 80x100)
    - raster operations AND, OR and XOR in write mode 2 (based on SF patch #707931)
    - 'split screen' in standard VGA graphics mode implemented (based on
      SF patch #707931)
    - 'double scan' and 'double width' now handled in the VGA code
    - more accurate emulation of the horizontal and vertical retrace
    - changeable start address and variable line length supported by all
      graphics modes
    - VBE: preserve video memory feature implemented
    - additional text mode features prepared (handled in the display library
      code)
  - cmos
    - date/time change support added
    - UIP bit implemented
  - keyboard
    - keyboard reset function (0xff) now resets the keyboard
  - gameport
    - new standard PC gameport device (real joystick connected on Linux only)
  - serial
    - FIFO emulation (UART type 16550A) implemented
- general
  - fixes for compilation with MSVC (patch from Andrew Zabolotny)
  - fixes for cross-compilation (patch from Jeroen Janssen)
- configuration interface
  - wx configuration dialogs improved
  - gui dialogs as an extension of the textconfig interface on win32 added
    * ask dialog
    * save text snapshot
    * user button shortcut
    * floppy image change
- display libraries
  - win32 + wx + x: new application/window icon (bochs.ico / icon_bochs.xpm)
  - sdl + win32 + wx + x: new textmode features: variable line length,
    char width switch, horizontal and vertical pel panning
  - win32 + wxMSW: key event handling rewritten
  - win32: status bar at the bottom of the simulation window added
  - wxMSW: resource problems fixed - wx dll plugin works now without errors
  - x: external font files and their installation mechanism removed
  - term: variable line length and cursor enable/disable feature implemented
  - rfb
    - textmode: charmap change, better cursor emulation, variable line length
    - headerbar works now (power, reset and user button are okay)
    - key event handling rewritten
    - Bochs-RFB waits up to 30 seconds for a client connection. The emulation
      starts after connecting the client.
- documentation
  - user documentation updated and extended:
    - improved section "What does Bochs need"
    - command line arguments
    - search order for the configuration file
    - the configuration interface 'textconfig'
    - FreeDOS Beta 8 installation instructions
  - already ported and obsolete parts of the old documentation removed
  --------------------------------------------------------------------------

- Peter's changes...

- SF patches applied
  #658950  Bug in FPU                               (???)
  #678117  build fail due to bad SGML punctuation   (???)
  #671873  minimal USB support (UHCI)               (Ben Lunt)
  #682539  Fix CapsLock and NumLock behavior        (rock at gimp.org)
  #720776  REX MOVB immediate broken for x86_64     (Arnd Bergmann)
  #729450  new keymap x11-pc-be.map                 (Wouter Verhelst)
  #735990  Limited patches for VC++                 (???)
  #742670  fix library dependencies in GUI plugins  (Robert Millan)
  #742782  LFB bugfix                               (Jan L. Hauffa)
  #748414  load32bitOShack bug                      (kyriazis at nvidia.com)
  #830079  Fix bochs's application error if ...     (???)
  #724466  enable building with CC=gcc-3.2 CXX=...  (Leonard Norrgard)
  #834962  Fixed drawing graphics is broken         (???)

- SF patches partially applied
  #707931  Support EGA/VGA write mode 2 and others  (???)
           already applied: disable IME, split screen, write mode 2

- patches applied
  - patch.highmem by Zwane Mwaikambo (memory allocation)
  - patch.floppy-160k-180k-320k-benlunt by Ben Lunt (exotic floppies)
  - patch.perf-regparm-cclark by Conn Clark (performance)

- patches by X, Y, and Z were added...
// CB : I think Bryce meant patches that were applied to the main trunk here
	added rombios patch by Dirk Thierbach
	added rombios patch by Kory Markevich
	added patches collection by Vitaly Vorobyov

- these S.F. bugs were fixed 
// CB : I ran the request on SF, these bugs have definitely been closed 
// since 2.0.2). There might have been others, during 2.0 to 2.0.2 times
   #813556 Compile error under gcc 3.3.1
   #809758 RIGHT ALT does not function properly
   #809695 CVS complains about unknown files after compilation
   #628762 Error in Floppy Booting
   #474526 Crash under win32 (access violation)
   #687619 test case for BX_CPU_C::IRET32
   #664544 Panic in IRET32 - Reporting test case
   #637822 test case for BX_CPU_C::IRET32
   #603410 BX_CP U_C::IRET32
   #537047 IRET32 incomplete emulation, panic
   #805541 Compile fails on i686, gcc 3.3
   #798829 Problem booting from ISO image
   #688163 Panic at rombios.c
   #688161 rombios.c crashes when boot from a CD.
   #796339 int 15h, e801h broken?
   #666946 Slowdown Timer should be a module
   #783826 the clock is extremely fast
   #645609 Real Time Clock is too *FAST*
   #663320 flaw in IO bitmap permission handling
   #764929 Timing is off.
   #659510 Bochs timing off by x10
   #787138 No ROM BIOS character map
   #787134 Config options not saved
   #689201 Disassembler bug
   #666202 Windows 2000 - random screen blanking with linux DLX demo
   #629242 reset during Doom -> BIOS panic
   #685508 PANIC: prefetch: RIP > CS.limit
   #695434 minix floppies won't boot.
   #764473 Freesco Linux crashes on boot
   #656026 error when trying to run some stuff
   #614202 HD: non-byte IO read to 01f4
   #777357 Strange FPU compiler error
   #583758 gag bootloader doesn't run
   #658639 ne2k panics with MS lanman Client/DOS62
   #536711 problem running smart bootmanager
   #741433 Disabling all ata# results in HD error.
   #753200 lock instruction doesn't do an illegal instruction trap
   #679389 libbx_wx.so.0: undefined symbol
   #758936 Problem Installing Bochs
   #742580 I configured fants but bochs still give me the same error
   #772242 iodev/vga.cc wrong memory access.
   #739222 Cannot change resultion
   #693344 libwx_gtk2.3.so.2 RedHat linux 8.0
   #639320 sparc: needs -lm to compile
   #587422 Windows 95j doesn't boot
   #547817 sparc: rfb needs -lsocket
   #480963 RFB: option to wait for client
   #763893 i've got problems with a "libvga.so.1" and another file
   #766490 Documentation mistake
   #766481 Bochs 2.0.2 Fails to compile on YDL3.0
   #626144 %lld is not portable
   #752241 lock prefix erronously allowed for some instructions
   #743305 fetchdecode.c probs
   #658707 Automatic exit?
   #696758 BeOS can't mount image disk, won't complete boot.
   #737048 Enabling keyboard resets controllers translation mode
   #717713 Bochs panics on startup on RH 9
   #738808 VGA PANIC
   #730922 seg fault on "bochs boot: cdrom"
   #658905 VGA read write error
   #564218 Panic on vga_mem_write
   #614231 X11 doesn't support charmap change
   #708311 Missing CGA low-res emulation
   #720776 REX MOVB immediate broken for x86_64
   #643296 lock prefix, unallowed cases
   #716964 [sb16] OPL.timer_running not initialized
   #662074 little mistake in the default config example
   #470701 CD-ROM on Win2K needs FILE_SHARE_READ
   #706454 bug??
   #653861 Win32 build bug
   #421155 panic on vga read 0x3c7,0x3cb
   #666434 VGA BIOS: Incompatible mode reporting
   #681819 Incorrent return value from cdrom reads
   #648222 Lotus Agenda futuristic dates off
   #657455 doesn't boot plan9
   #658938 SGDT in VM8086 

-------------------------------------------------------------------------
Changes in 2.0.2 (January 21, 2003):

- fix possible segfault in wxWindows (Volker Ruppert)
- fix instrumentation (Stanislav Shwartsman)
- fix cdrom read_toc() function for *BSD (Keith Matthew Jones)
- fix NetBSD boot from cdrom (Christophe Bothamy)
- fix cmos checksum (Volker)
- fix "refresh bit" behaviour in pit (Volker)
- fix .bochsrc parsing (Volker)
- fix vga resize/redraw problems (Volker)
- fix compilation issues on Irix and Tru64 (Christophe)
- fix MMX/SSE bugs (Stanislav, Peter Tattam)

-------------------------------------------------------------------------
Changes in 2.0.1 (January 4, 2003):

- fix corrupt saved configuration files (Christophe Bothamy)
- fix missing break statements in apic (Shai Fultheim)
- fix compiling sb16 under FreeBSD (Volker Ruppert)
- updates to the documentation (Volker)
- fix text mode colors 8 to 15 (Volker)
- fix FPU integer load bug (Volker)
- stop pasting on hardware reset (Volker)

-------------------------------------------------------------------------
Changes in 2.0 (December 21, 2002):

Since the change log is hundreds of lines long, here is a very brief summary.
- 2x emulation speedup!!!
- added plugin devices and guis. Now you can compile with many more
  options, and choose between them at runtime.
- added emulation of AMD x86-64, MMX, SSE, SSE2 instructions
- add wxWindows port (a graphical configuration interface and display lib)
  and SVGAlib port (full screen display for Linux without X11)
- improvements in many I/O devices: for example up to 8 hard disks/cdroms,
  TUN/TAP network interface, 360k floppies,
- improved MacOSX/Carbon interface and updated MacOS9 port
- GDB remote stub, allows symbolic debugging with Bochs simulation.
- support for up to 32gig hard disk images

Detailed change log follows.

- documentation
  - manpages updated (Volker, Christophe)
  - install HTML rendering of docbook documentation instead of 
    docs-html (Bryce)
  - doc/docbook/Makefile is now generated by configure script.
    if configure detects docbook2html on your system, it will turn on
    --enable-docbook and run make in the doc/docbook directory.  Also
    make install will install documentation into $(docdir).  You can use
    --disable-docbook to turn this off, if necessary. (Bryce)
  - add "make bochsdoc.tar.gz" target to create a documentation tarball.
    If you do "make webinst" and you have write access on SF shell server,
    it updates doc/docbook/* on the website (Bryce)
  - user documentation additions:
    - new options (Bryce, Volker, Christophe)
    - Bios tips section (Christophe)
    - Tuntap section (Christophe)
    - Serial Port section (Christophe)
    - "Will it Work for Me" / "Is Bochs Right for Me" sections 
      (N. David Guarneri)
    - VESA section (Jeroen Janssen)
    - several documents, previously existing as separate html files, have
      been included :
      - internal debugger section (Christophe)
      - gdb stub debugger section (Christophe)
      - WinME, WinNT, WinXP, The Hurd, Japanese Win95 install tips (Christophe)
      - Win95, Win98 install tips (N. David)
      - SB16 section (N. David)

- configure script/compile/porting to other OSes/installation
  - added plugin architecture
    - plugin code written by Bryce, Christophe, Volker based on
      plex86's plugin code by Kevin.  Testing help from Psyon and Br'fin.
    - 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.
    - all display libraries, most I/O devices are converted to plugins now
    - plugins supported on Linux, Solaris, and MacOS X using libtool,
      Cygwin using dlltool.  On MacOSX, you must have dlcompat installed
      and in your include/library paths at configure time.  (See .conf.macosx
      for an example.)
    - we use libtool's LTDL library from libtool 1.4.2, with a number of
      critical bug fixes (Bryce Denney)
    - the Linux binary RPMs are built with plugin support
    - to compile with plugins, configure with --enable-plugins
    - the LTDL_LIBRARY_PATH variable tells Bochs where its plugins can be
      found.  Bochs has a compile-time default for this variable which is
      correct if you do a make install.  You would only need to set the
      variable if the default is wrong.
    - for win32 plugins we added "BOCHSAPI" in front of many classes
      and methods, to aid in building DLLs.  This turns into __declspecs
      which are used when making an export library for Bochs.
  - allow many display libraries to be configured and compiled at
    a time.  For example --with-win32 --with-sdl --with-rfb.
    Also, we added an experimental option --with-all-libs which
    tries to detect which --with-* options will work.  If the
    autodetection fails, just type the --with-* options explicitly. (Bryce)
  - add #if's around all files which are conditionally compiled such
    as cdrom.cc and sb16.cc.  This makes it possible to compile every
    source file all the time, which has the potential to simplify the
    configure script and makefiles.  At present we only take advantage
    of this capability in the win32 VC++ workspace. (Bryce)
  - the MacOS9 port has been updated so that it works again.  It had
    not been updated in at least 2 years, maybe more.  (Christophe Bothamy)
  - improve support for FHS standard (Robert Millan, Volker Ruppert)
    See patches 551811 and 650066.
  - keep separate CFLAGS and CXXFLAGS for Bochs (usually a graphical
    program) and console programs such as bximage and niclist.  Some
    sdl and wx compile flags were making bximage and niclist unusable.(Bryce)
  - add concept of cross-configuring in the configure script.  If you
    use the --target option to generate makefiles to be used on another
    machine, some detection of compilers and libraries is disabled. (Bryce)
  - fix term compile on Cygwin, but it has to be done without -mno-cygwin,
    which means that several win32 features such as networking do not work.
  - add "-Wno-multichar" on beos
  - test for largefile support, and add required CFLAGS (Bryce)
  - add -lm when it's needed, and not when it's not (Bryce)
  - add configure support for 8 processors. Bochs can support up to 15
    with some work on the BIOS.
  - fix nmake makefile generation (Psyon)
  - improved pthread detection function from ac-archive project on SF
  - add installer package for Windows, using Nullsoft (Michael Rich, Bryce)
  - on MacOSX, add startup script that creates a text console and then
    runs Bochs.  Also add make target to create a DMG disk image (Br'fin)
  - do not restart the font server on Unix/X11, if vga.pcf was already
    installed.  On several modern machines, if you restart the font 
    server the user has to restart X windows. (Bryce)
  - update most .conf.* files with modern options such as 
    --enable-all-optimizations. (Bryce)
  - The MacosX .conf script adds /sw/include and /sw/lib to the compile/link
    path list because it is a common place to put dlcompat.  Dlcompat is
    required when building with plugins. (Bryce)
  - rpms can now be built without root privileges (Bryce)

- command line
  - fixed up our command line options (Volker, Bryce, Christophe)
      Usage: bochs [flags] [bochsrc options]
      -n               no configuration file
      -f configfile    specify configuration file
      -q               quick start (skip configuration interface)
      --help           display this help and exit

- configuration file (bochsrc)
  - There are several new options. See the documentation for more details.
    - config_interface: select text mode menus or wxWindows for configuration
    - display_library: select which display lib to use
    - optromimage: load optional rom images
    - ataN (N=0,1,2,3): up to 4 ATA controllers for hard disks, cdroms
    - ataN-master, ataN-slave, N=0,1,2,3: defines a hard disk or cdrom.
      The "ata*" options replace diskc, diskd, and cdromd, which are
      now deprecated.
    - floppy_bootsig_check: control the 0xaa55 signature check on boot floppies
    - logprefix: lets you change the format of log messages
      (patch by Carl Sopchak, help from Christophe)
    - debugger_log: log all output from bochs debugger
    - user_shortcut: allow you to type key combinations like Ctrl-Alt-Del
    - pit: control the PIT model, including realtime option to try to
      keep in sync with real time.
    - Credits: Christophe added optromimage, everything about ATA, 
      floppy_bootsig_check, debugger_log.  Bryce added config_interface
      and display_library.  Volker did the user_shortcut button.
      Greg Alexander wrote the PIT model and added the realtime option.
  - since v1.3 we've been able to use environment variables in pathnames
    in the bochsrc file.  Now, a few variables have default values, set at
    compile time, that are used if the user does not set a value.  If Bochs 
    is installed correctly, the defaults will be correct and the user will 
    not need to override them.
    - $LTDL_LIBRARY_PATH is the path name where the plugins can be found.
      The default value comes from $(plugdir) in the makefile.  This is only
      important if plugins are enabled. (Bryce)
    - $BXSHARE is the path where the BIOSes and keymaps are installed.
      The default value comes from $(sharedir) in the makefile.  Disk
      images on the Bochs website will begin to use BIOS pathnames like
      $BXSHARE/BIOS-bios-latest.  On win32, the $BXSHARE default is 
      set by the NSIS installer and read from the registry.  On MacoSX,
      the $BXSHARE default is set to the path containing bochs.app.
      (Bryce, Volker, Br'fin)
  - new option in the configuration interface to reset all bochsrc 
    settings to initial defaults.  A reset occurs just before reading
    a new configuration file, so that leftover parameters from a
    previous configuration do not affect the new configuration.  Also, 
    you can request a reset using the configuration interface. (Volker, Bryce)
  - ne2k line can now specify a script to set up the interface (Christophe)
  - on Unix, also search /etc/bochsrc (Bernhard Bablok)
  - you can use #include in the bochsrc to read configuration from other 
    files (Volker)

- CPU
  - speed optimizations from Kevin Lawton, yielding around 2x speedup
    - guest2host_tlb : for entries in the paging TLB which point to normal
      physical memory pages, a pointer to the host address of the emulated
      physical memory (from malloc()) page is stored in the TLB entry.  In
      many cases, this pointer can be used in memory accesses to directly
      read/write the guest memory address.  In exceptional cases, the physical
      memory access routines are used.  Turn on with --enable-guest2host-tlb.
    - repeat IO/string : for some variants of repeatable IO and string
      instructions, the segmentation and paging checks are done in batch along
      with the data transfers, constrained within page boundaries and the
      segment limits.  Turn on with --enable-repeat-speedups.
    - icache : The structure holding instruction decode information was
      reduced to 32 bytes.  24 bytes for the actual decode data, and 4 each
      for pointers to the address resolution routine (not always needed) and
      the instruction emulation routine.  With a reasonably small
      per-instruction decode size, an instruction cache (iCache) was created,
      which is simply a hash table.  The main cpu loop looks in the table
      first; if the instruction has already been decoded, execution can begin
      immediately without decoding.  Turn on with --enable-icache.
    - host specific asm : when compiling on an x86 platform, use of
      x86-specific asms can be enabled to accelerate several facets of
      emulating instructions.  For example, the EFLAGS values are much more
      efficient to calculate when the actual x86 instructions are used to
      generate the EFLAGS values.  Turn on with --enable-host-specific-asms.
      (Kevin, with help from Jas Sandys-Lumsdaine)
    - if you want to enable all the speed optimizations that we believe
      to be stable, use --enable-all-optimizations.  The release binaries
      are built with this option.
  - add support for AMD's x86-64 instruction set.  To enable, configure with
    --enable-x86-64.  The AMD x86-64 support is about 90% complete and is
    still experimental.  We've implemented the core x86-64 instruction set and
    the changes to the rest of Bochs necessary to operate in long mode, but
    we've still to implement checking for canonical 64 bit addresses. The code
    has been tested on a limited number of test programs.  It has been able to
    successfully boot a x86-64 Linux kernel and run a 64 bit userland
    application.  It has also successfully run a DOS based 64 bit protected
    mode test application. (Peter Tattam, with merge/bugfix help from Kevin
    Lawton and Bryce Denney)
  - add MMX support. To enable, configure with --enable-mmx. 
    (Stanislav Shwartsman)
  - add SSE and SSE2 support. To enable, configure with --enable-sse=1
    or --enable-sse=2. (Stanislav)
  - fixed the behaviour of the bcd instructions AAM, AAD and DAA based on
    SF patch #537146 (Volker)
  - stop printing an error for VERR/VERW. According to the i386 opcode
    description there is no error present. (Volker)
  - fix bug [ 625878 ] reset doesn't reset something(?). Fix cpu reset
    when executing a rep instruction (Christophe)
  - use accessors methods for CFLAGS and several other registers, so that
    the implementation can be changed transparently later (Bryce, Stanislav)
  - add support for page size extensions, also known as 4meg pages.
    Turn on with --enable-4meg-pages. (Kevin Lawton)
  - add support for page global extensions.  Turn on with
    --enable-global-pages.   (Kevin)
  - add support for physical address extensions.  Turn on with --enable-pae.
    (Peter Tattam)
  - implement RDMSR and WRMSR. not all MSRs are supported (Zwane Mwaikambo)
  - new configure option --enable-ignore-bad-msr, which makes unrecognized
    MSR reads and writes into just a warning
  - fix PIC/APIC interrupt problem that caused Linux 2.4.19 to hang 
    during boot (Peter)
  - CMPXCHG8B patch (Michael Hohmuth)
  - EFLAGS are now stored in the same form as the native EFLAGS on an x86,
    so that we can use native machine instructions in some cases (Kevin)
  - instrumentation code updated (Stanislav)

- FPU
  - fixed bug [ 452275 ] fprem emulation bug (Volker)
  - fixed bug [ 648579 ] Mac OSX >>PANIC<< FPU_printall. There was an 
    endianness issue with the fpu (Christophe)

- I/O devices
  - rewrote pc_system timers (Kevin)
  - biosdev
    - this new device handles the panic/error/info/debug messages sent 
      by the Bios and VGABios.  It was previously done in the unmapped device. 
  - cdrom
    - implementation of the function READ TOC for cdrom image files. (Volker)
    - function capacity() for win32 fixed. Now it returns the number of blocks
      instead of bytes. (Volker)
    - added multiple cdrom support for win32 (NT/2000 version untested). The
      ASPI version uses the cdrom drives in the system's order. Drive letters
      are not used by ASPI. (Volker)
    - fix configure script's cdrom detection on BeOS (Bryce)
    - fix physical CD change at runtime (Bryce)
  - cmos
    - fix panic when WinXP read port 70h (Christophe)
    - add ps/2 style century at index 37 to allow WinXP to boot. (Bryce)
  - dma
    - DMA register and unregister functions for DMA channels added and macros
      for DMA functions defined. The changes are based on the Plex86 functions.
      (Volker)
    - implementation of the DMA controller reset (Volker)
    - the value of the command register must be always 0x00 (BX_ERROR fixed)
  - floppy (Volker)
    - implemented Tape Drive Register (Dave Poirier)
    - added support for 360k floppy images
    - the skip flag (SK) in command 'read sector' is ignored now
    - floppy read and write function do not set the 'seek end' bit in status
      register 0 (fixes SF bug #553377)
    - the status of the 'disk changed' line depends on the selected drive.
      The digital input register is now an array (DIR[4]).
    - apply patch [ 635021 ] floppy cleanup by Alex Thiel 
    - distinguish between floppy drive type and media type
  - hard drive
    - add largefiles support, to allow disk images larger than 2gig.
      (Stu Grossman)
    - missing conditions for lower_irq() added (Volker)
    - several noncritical panics replaced with BX_ERRORS and the controller
      returns an error code until we implement the features (Volker)
    - applied patch from Carl Sopchak for booting  sco openserver
    - allow disk block access only if concatenated images are not used
      (Christophe)
    - fix bug [ 419415 ] netbsd 1.5 rescue disk won't boot (Volker)
    - multiple drq atapi data transfers corruption fixed (Christophe)
    - added some commands to the unsupported "Set Feature" commands (Christophe)
    - speedups in repeated IO transfers (Kevin)
    - support for Peter Tattam's external disk simulator (Bryce)
    - 4 channels / 8 devices support (Christophe)
    - "inquiry" atapi command results corrected (Volker)
    - check for incomplete devices configuration before starting the
      simulation (Bryce)
    - implemented the different bios disk translation schemes (Christophe)
  - keyboard and mouse
    - add commands 0xd2, 0xdd and 0xdf (Dave)
    - fix bug [ 613975 ] wxWindows: params redefined on restart (Bryce)
    - in function mouse_motion(): added parentheses to fix compilation problems
      with MSVC. See SF bug #575301. (Volker)
    - added missing register_irq() for the PS/2 mouse IRQ12 (Volker)
    - fix "AltGr" key on European keyboards wxWindows/win32, SDL (Volker)
  - NE2000
    - function reset() clears the IRQ line (Volker)
    - added TUN/TAP interface (Renzo Davoli, Christophe)
    - fix DOS based packet drivers that use an odd count for the NE2000 DMA (Peter)
    - changed "TCR write, reserved bits set" panic into an error, fixes
      networking with debian image (Bryce)
  - parallel
    - parport1 enable/disable support added (Volker)
  - PCI (Volker)
    - implementation of the PCI device register mechanism
    - PCI memory handling moved to the memory code
    - replaced memcpy() in pci_read() by a more portable code. Problems with
      PCI on big-endian machines are fixed now (SF bug #638481).
    - implementation of the PCI-to-ISA bridge started (still incomplete)
  - PIC
    - fixed detection of single mode and level senistive mode in ICW1 (Volker)
    - fixed handling of rotate_on_autoeoi for master PIC (Volker)
    - irq mask is now cleared on initialization (Dave)
    - fixed lockup during mouse movements during win98 install. (patch from 
      Wilfried Weissmann)
  - PIT
    - Added realtime PIT support (Greg)
  - Sound Blaster 16
    - it used to enable itself all the time; now only when you ask
    - fix memory leaks (Bryce)
  - serial
    - don't cause problems when serial device is disabled (Volker)
  - unmapped
    - add programmatic shutdown feature at port 0x8900 (Christophe)
  - vga
    - VBE fixes (Jeroen, Volker)
    - CRTC fixes (Volker)
    - sequencer reset with bits 'reset1' and 'reset2' implemented (Volker)
    - add charmap change support (used by SDL, win32 and wxWindows gui) (Volker)
    - screen dimensions / updates for some graphics and text modes fixed (Volker)
    - use the start address when calculating the byte offset for standard
      EGA/VGA modes (Volker)
    - byte offset for modeX fixed (use value of CRT register 0x13) (Volker)
    - text mode memory mappings 0 and 1 support (Christophe)
    - fix bug [ 612741 ] VBE mem conflicts w/ local APIC address (Jeroen)
    - fix bug #635223: VGA tiles array access out of bounds (Bryce)

- ROM BIOS
  - improve compile process. Now bioses for 1, 2, 4 and 8 processors 
    are built at the same time (Bryce)
  - fixes to be able to compile the bios with gcc2 or gcc3 (Jeroen and
    Christophe)
  - changes on boot signature check (Christophe):
    - never done for cdroms
    - always done for hard-disks
    - conditional for floppies
  - add keyboard int16 functions 0x09 (get keyboard functionality) and 
    0x0a (get keyboard id) (Christophe)
  - fix bug [ 629810 ] int 16/ah=01 broken? Enable interrupt on entering
    int16 handler (Christophe)
  - new keyboard init in POST (patch from Adam Sulmicki)
  - flush input and output keyboard buffer before keyboard self test
    (Volker and Christophe)
  - fix bug [ 547603 ] kbd up/down arrows in dos install (Christophe)
  - fix bug [ 549815 ] bios wrongly loads CS,ES.  CS and ES are set to 0
    before the bootloader code is called. (Christophe)
  - PCI functions support (Volker) :
    - BIOS32 service directory
    - real mode PCI int1a functions 
    - protected mode PCI int1a functions 
  - fix reset for MS-DOS and Win95 (Volker)
  - 360K floppy support (Volker)
  - enhanced ata/atapi support (Christophe) :
    - 4 channels / 8 devices
    - device auto detection (with help from Adam Sulmicki)
    - EDD3.0 
    - 32bits device access
    - optional disk translation "large", "r-echs" or "lba" (up to 8.4GiB)
  - re-enable harddisk controller interrupt after reads/writes. 
    Win95 can now use native access to harddisks and cdroms. (Volker)
  - shutdown status handling (cmos index 0x0f) (Christophe) :
    - fix bug [ 601166 ] CMOS Problem @ "0x0F Index 0x05 data". After reset
      execution will resume by a jump to [0x40:0x67] if the shutdown status 
      is 5 
    - the bios don't panic any more if the shutdown status is 9
  - two parallel ports detection in POST (Volker)
  - two serial ports detection in POST (Volker)
  - add int15 extended memory function 0xe820 (patch from osmaker) and
    0xe801 (patch from Hartmut Birr)
  - fix return values on some int15 functions (Bryce)
  - fix int70 handler overlapping int08 handler (Christophe)
  - simplify 8 processors BIOS for operating systems which don't do 
    paranoia/sanity checks (Zwane)

- configuration interface
  - wxWindows config interface now allows you to change every bochsrc
    option using menus and dialog boxes.  There is also the beginning of
    a wxWindows graphical debugger, but it needs a lot of work before it
    will be useful.
  - renamed control.cc to textconfig.cc.  Now we're calling it a 
    text configuration interface, instead of a control panel.

- display libraries
  - Even though we've had them for years, the term "display library" is new in
    release 2.0.  In the gui directory, Bochs has a number of different C++
    files which you can select to display the text and graphics on the
    simulated monitor.  Each of these is a display library.  The display
    libraries are:
      x          use X windows interface, cross platform
      win32      use native win32 libraries
      carbon     use Carbon library (for MacOS X)
      beos       use native BeOS libraries
      macintosh  use MacOS pre-10
      amigaos    use native AmigaOS libraries
      sdl        use SDL library, cross platform
      svga       use SVGALIB library for Linux, allows graphics without X
      term       text only, uses curses/ncurses library, cross platform
      rfb        provides an interface to AT&T's VNC viewer, cross platform
      wx         use wxWindows library, cross platform
      nogui      no display at all
  - it is now possible to compile Bochs with support for many different
    display libraries and select the one to use at runtime (even without
    plugins).  See the display_library directive in .bochsrc.
  - add new svgalib display library by Igor Popik
  - fix bug [ 614724 ] SDL can get stuck in full screen mode
    display libraries such as SDL which have a full screen mode can be
    dangerous, if Bochs does not switch back to normal display mode at
    the right time.  This is fixed for SDL and the new svga.
  - keymap support added in SDL interface (Bryce, Volker)
  - new keymap files: SDL keymaps for US and DE keyboards,  X11 keymap
    for Danish keyboard.
  - use keyboard mapping for keyup messages too
  - renamed almost all references to data type "Boolean" to "bx_bool".
    The Boolean data type was defined in Carbon.h headers, and conflicted
    with Bochs's definition.  See bug [ 618388 ] Unable to boot under MacOS X
    Exceptions: When talking to the Carbon library, you must use Boolean.
    Also, siminterface.h uses standard "bool" instead of bx_bool.
  - "User" button added in toolbar. It can send keyboard shortcuts to
    the guest OS. (Volker)
  - snapshot improvement and memory leak fixed (Volker)
  - testing framework, based on comparing screen content, added (Greg)
  - term display library:
    - support for color terminal, function keys, clear screen (Volker)
    - solaris compilation problem (bug #613393) fixed (Bryce)
  - win32 display library:
    - use native win32 toolbar for headerbar, use system palette (Volker)
  - many Carbon interface improvements:
    - patch [ 549248 ] Fix Carbon key & menu handling (Chris Thomas)
    - partial keymap support, copy&paste, menu items fixed, new toolbar
      behavior, dialog box display for panics (Br'fin)
  - sdl display library:
    - keyboard fixes and key mapping added (Bryce)
    - when captured, the mouse is forced to stay in the window. fix bug
      [ 619283 ] SDL: os mouse pointer leaves the window (Bryce)
  - x display library:
    - bug [ #537593 ] vga font not being found fixed. If vga font not 
      found, search for a font called "-*-vga-*" (Bryce)
    - keyboard problems fixed (Bryce, Christophe)
  - beos platform, any display library: add a nice icon to the executable
    (Bernd Korz)

- wxWindows
  - wxWindows is a cross-platform C++ user interface library which you can
    download for free at http://wxwindows.org.  wxWindows provides C++
    classes for all sorts of GUI controls (buttons, menubars, etc.) and
    implements all of them using the native controls on the platform.
  - The new wxWindows port of Bochs provides both a graphical configuration
    interface (for editing bochsrc options) and a display.  It was
    written by Bryce Denney, Don Becker, Dave Poirier, and Volker Ruppert.
  - In release 2.0, we concentrated on making the wxWindows port as stable
    and functional as the other interfaces.  wxWindows provides a great
    toolbox that we can use to make Bochs easier to learn and use.
  - wxWindows supports charmap changes, keyboard mapping, cut and paste,
    text and graphics modes, text mode cursor size, and mouse (Volker, Bryce)
  - To compile Bochs with wxWindows, you should install wxWindows 2.3.3
    or later.  Then configure Bochs with --with-wx.
  - if you have multiple versions of wxWindows installed (e.g. a debug
    and a release version), you can set $WX_CONFIG before configuring 
    to select between them. (Bryce)

- Bochs debugger
  - [ 609616 ] remote GDB stub
    add GDB Stub support from Johan Rydberg, with bug fixes by Stu Grossman
  - add hooks for external debugger for win32.  The external debugger 
    that connects to Bochs is distributed in 
    build/win32/tattam-external-debugger.zip in binary form. Turn on
    with --enable-external-debugger.  (Peter)
  - add "debugger_log" option to bochsrc, which logs all debug output
    into a file. feature [ 629068 ] (Christophe)
  - debugger is now usable in fullscreen SDL and SVGA guis.  It will
    switch back to text mode for each debug prompt (Bryce)
  - disassembly output cleaned up and improved 
    (Kernel Panic, Peter Tattam, Jonathan Shapiro, Luiz Henrique Shigunov)
  - fix [ 628806 ] debug: x/c prints unprintable chars (Bryce)
  - add the beginnings of a wxWindows debugger. Not ready for mainstream use
    yet. CPU register display is implemented, and you can type any debugger
    command you want into the Debug Console window. (Bryce)
  - add help command (Alexander Krisak)
  - symbol table lookups cleaned up a bit (Bryce)
  - displays the address of the caught watchpoint, feature #435271 (Dave)
  - remove obsolete "loader"

- utilities
  - fixed bug [ 487758 ] bximage fails on file creation >2048meg 
    Bximage should now work up to 32gig. (Bryce)
  - on win32, both bximage and niclist now ask the user to press
    return before exiting, so that you have time to read the results
    before the window disappears. (Bryce)

-------------------------------------------------------------------------
Changes in 1.4.1 (June 22, 2002):

- now cdrom is enabled in configure, unless you specifically disable
  it with --disable-cdrom. (Christophe)
- fix compile error in main.cc when SMP or APIC is enabled (Dave)
- the runtime menu now displays 11 (continue) by default (Bryce)
- initialize DMA controller before floppy and SB16
- fix DMA panic when installing win95 (Volker)
- first character of the vga bitmap is blank on win32 (Volker)
  Before, it was incorrectly coded as a '@'.
- AltGr key on European keyboards works now on win32 (Volker)
- fix problem with console/serial port on Bochs exit (Volker)
- enable serial port for GNU and GNU/Linux (Volker)
- small documentation fixes (Volker)
- remove unnecessary include statements for X11 (Volker)
- italian keymap added (Emanuele Goldoni)
- fix win32 ethernet frames error. It will no longer reject packets
  that are less than 60 bytes long. (Peter Tattam)
- BIOS fixes :
  - win2k cd-boot (Christophe)
  - emm386 crash (Dave)
  - cs=0 at boot time (Christophe)
  - keyboard failure in scandisk (Dave)
- fix bug in forming the 64-bit APIC base address from two 32-bit registers.
  A compiler warning in cpu/proc_ctrl.cc pointed this out.
- fix default choice in the runtime options menu

-------------------------------------------------------------------------
Changes in 1.4 (March 27, 2002):
- ROM BIOS
  - Boot from CDROM!  Christophe Bothamy added partial El Torito support in
    rombios.c, which allows Bochs to boot cdroms.  Booting from win2k or winXP
    cdrom is not supported yet.  The default BIOS includes El Torito functions.
    the boot line must say "cdrom".
    Example:
      boot: cdrom
  - implementation of int13 diskette function 5 (format track) (Volker)
  - initialisation of PIC and DMA-2 added to POST code (Volker)
- configure script (Bryce Denney)
  - the configure script now detects your platform and provides a default
    GUI and the required compiler flags.  All supported platforms should
    compile with simply "configure" and "make".
  - default guis by platform: 
     - win32/windows/cygwin: win32 gui
     - MacOS X: carbon gui
     - MacOS 9 or earlier: macos gui
     - BeOS: beos gui
     - AmigaOS: amigaos gui
     - all other platforms: X windows gui
  - compile arguments supplied by configure script
    - win32: too many to list here; see documentation
    - cygwin: -mno-cygwin -DWIN32
	- MacOS X: -fpascal-strings -fno-common -arch ppc -Wno-four-char-constants
	           -Wno-unknown-pragmas -Dmacintosh
  - the --with-GUINAME configure option is only needed if you want to override
    the default GUI.  This is the only way to use the Term, RFB, and SDL
    GUIs.
- VGA
  - added VESA BIOS Extensions code by Jeroen Janssen (banked mode only, LFB
	support in patches)
  - vga memory read/write functions in text mode fixed
  - implementation of CGA mode 320*200*4 (patch from Sebastien Bechet)
- VGA BIOS
  - updated Christophe Bothamy's LGPL VGA BIOS to version 0.3a.  This consists
    of a bug fix for function ah=13 and VBE support by Jeroen Janssen.
- networking
  - chipmem read/write limit fixed (Mike Lerwill)
  - writing a byte in 16-bit mode now possible (Mike Lerwill)
  - new ethertap interface for Linux, which allows Bochs to talk to 
    the local machine and the internet (Bryce Denney)
  - NE2000 is now enabled by default on Win32, Cygwin, and Linux compiles
    in the .conf.* scripts and release binaries.
  - fix check for auto transmit disable, which was checking the wrong bit
    (Peter Tattam)
  - Win32 only
    - niclist.exe has been revised to work on more Windows versions, and it
      suggests a usable ne2k line (Dean Payne)
    - fix timeout setting so that ne2000 does not slow down the whole
      simulation (Don Becker)
    - bug fix: be able to handle multiple packets that arrive at once
      (Mike Lerwill)
- GUI changes
  - cdrom button: click this to notify Bochs when you changed the CDROM (Volker)
  - snapshot button: saves the text on the Bochs screen into a file called
    snapshot.txt (Volker)
  - copy button: on Win32 and X windows, copy the text on the Bochs screen
    to the clipboard (Volker)
  - paste button: on Win32 and X windows, paste the characters on the 
    clipboard into the Bochs window.  This requires keyboard_mapping to
    be enabled. (Bryce Denney)
  - improved text mode cursor for Win32, X11, and SDL (Volker)
  - new SDL interface (Dave Poirier, debugging by Christophe, Volker, Bryce)
    SDL is a graphics library that has works on many platforms.  This interface
    is experimental, and is missing a few features of the standard Bochs
    interfaces: extended keys (arrows, keypad).
  - MacOS X: add MacOS X carbonized event handlers by Jeremy Parsons
  - X windows: when not enough colors can be allocated, force use of 
    private colormap (Bryce Denney)
  - bug #490570 fixed: OUTB set and command 0xaa encountered (Dave Poirier)
- keyboard
  - completed keyboard emulation with the implementation of the three scancodes
    sets (mf1, mf2, mf3) with or without translation. This is based on Ludovic 
    Lange's plex86 keyboard patch. (Christophe Bothamy)
  - added a "keyboard_type" option, that defines the answer to an "identify 
    keybord" request to the keyboard controller. The available values are
    "xt","at","mf".  (Christophe Bothamy)
  - added an optional keyboard_mapping option that enables to use your
    country specific keyboard with Bochs.  If enabled, the keymap file must be 
    specified in bochsrc.  The available keymaps are US, German, Spanish and
    French for PCs running X11.  Contributions are welcomed.  (Christophe
    Bothamy)
  - added Windows(tm) key definitions (Volker Ruppert)
  - added paste button, which causes the emulated keyboard to type characters
    from the system clipboard.  This only works when keyboard_mapping is
    enabled. (Bryce Denney)
- cdrom
  - bug fix: win32 could not read a cdrom image file
  - eject cd support for linux (patch from Petr Stehlik)
  - BeOS fixes
  - changing cdrom media is possible now with CDROM button
- sound blaster(tm) emulation (Volker)
  - you can use --enable-sb16=freebsd now
  - 16-bit DMA controller added
  - 16-bit mode of the SB16 implemented (output to file works)
- floppy drive (Volker Ruppert)
  - implementation of the floppy command 'format track'
  - implementation of read / write operations with MT=0
  - behaviour of a few floppy commands fixed
  - floppy reset behaviour fixed
  - lots of other fixes
- fixed bug [ #468340 ] pic:slave: OCW3 not implemented.  Now the slave PIC
  supports all the modes that the master PIC does, and nobody will see this
  message again.
- serial port (by Volker Ruppert unless noted)
  - improved IRQ handling
  - now Windows 95 serial driver works correctly
  - fixed the return value of the MCR (loopback bit)
  - interrupt reasons LSR change and MSR change implemented
  - the number of data bits is considered when sending data
  - all serial port changes are tested in loopback mode only
  - serial port emulation fixed for FreeBSD and OpenBSD (Stu Grossman)
  - fix receiver poll frequency so that it doesn't slow emulation (Stu Grossman)
- Bochs debugger
  - when tracing, print the instruction just before it is executed, instead
    of just after (Greg Alexander)
  - after a triple-fault panic, you can now return to the debugger
- symmetric multiprocessor (SMP) simulation
  - no more panic if you read the EOI register
  - fixed default destination format in local APIC
  - fix SMP instruction tracing in bochs debugger
  - fix deadlock when debugger enabled and all processors HLT
  - MSR support added by Zwane Mwaikambo
- simulation of interrupts is more accurate (Volker)
  - implemented edge triggered interrupt mode
  - added functions raise_irq() and lower_irq()
- programmable interrupt timer (Greg Alexander)
  - fixed the PIT gate and improved the PIT printing options
  - experimental real-time PIT
- parallel port improvements (Volker Ruppert)
- bug fix: hard disk errors caused by overflowing imul in the BIOS code.  
  Sebastian Bechet and Peter Tattam tracked it down and fixed it.
- fix some memory leaks (patch from Darko Tominac)
- Double-Word IO is supported for ATA devices
- fix bash-specific syntax in install-x11-fonts script
- print stack_return_from_v86 error only the first 100 times

-------------------------------------------------------------------------
Changes in 1.3 (December 10, 2001):
- networking works on Windows and Linux platforms
- emulated cdrom can now read from ISO image files, on any platform.
- new PIT model by Greg Alexander which is much more complete than the
  old one.  The new PIT is used by default, but you can switch back to 
  the old one if you configure with --disable-new-pit.
  (PIT = 8254 programmable interrupt timer)
- new configuration menus by Bryce Denney, which allow you to change any
  bochsrc option using text menus, then save the configuration into
  a new bochsrc file for later use.  You can disable the new code using
  configure --disable-control-panel.  Also you can use the command
  line arguments -nocp or -nocontrolpanel.  Also, there is a new
  "Config" button on the GUI that allows limited changes to the 
  configuration at runtime, such as changing the floppy disk.
- add docbook documentation directory in the sources under doc/docbook.
  The transition from HTML to docbook documentation is still in progress.
- Add new log action "ask", as shown in these example bochsrc lines:
    panic: action=ask
    error: action=ask
  When an event occurs which is set to "ask", you get a beep and message
  on the text terminal that asks what you want to do.  Choices are: continue,
  continue and disable future messages from this device, quit immediately,
  or segfault (where abort() function is available).  If compiled with
  --enable-debugger, you can also choose to enter the debugger.
- Parallel port emulation cleaned up by Volker Ruppert.  See .bochsrc for
  syntax of new parport1 line in bochsrc.
- PCI support improved by Volker Ruppert, including BIOS changes.  Still
  not complete.
- floppy controller returns a proper error response if you try to write
  a read-only disk image.  For systems such as DOS that actually use the BIOS
  services, it was also necessary to add code in int13_diskette_function to
  recognize a write-protected error and return the correct error status code
  (AH=3, Carry Set).
- the ROM BIOS now prints panic messages to the console.  Thanks to Cliff
  Hones for his console display code.
- the ROM BIOS detects nonbootable disks (Barry Allard), and prints a message
  on the console.  Barry Allard's patch who helped with checking the boot
  signature.
- LBA support added for hard disks.  (Not tested very much.)
- add dependencies to makefiles
- logging code moved into a separate file, logio.cc
- new option --enable-slowdown-timer, by Greg Alexander, which kicks in if
  Bochs simulation time starts to run faster than real time.  This helps to
  keep the Bochs clock in sync with the real clock when the CPU is mostly
  idle.
- new option --enable-iodebug, by Dave Poirier, which creates an I/O
  interface to the debugger.  This lets you write software to be emulated
  in Bochs which can turn on instruction, register, or memory tracing
  using I/O accesses.
- improved detection of readline in configure script
- configure substitutes the version number into many files, instead of
  using sed in the makefile.  There are still a few uses of sed remaining.
- you can now use environment variables in bochsrc values.  For example,
  diskd: file="$BOCHS_IMG/diskd.img", cyl=615, heads=6, spt=17
- configure with --prefix=PATH works now
- running configure from a different directory works now, thanks to 
  a patch from Edouard G. Parmelan
- fix [ #433759 ] virtual address checks can overflow.
  > Bochs has been crashing in some cases when you try to access data which
  > overlaps the segment limit, when the segment limit is near the 32-bit
  > boundary.  The example that came up a few times is reading/writing 4 bytes
  > starting at 0xffffffff when the segment limit was 0xffffffff.  The
  > condition used to compare offset+length-1 with the limit, but
  > offset+length-1 was overflowing so the comparison went wrong.
- cmpxchg8b patch from Michael Hohmuth <hohmuth@innocent.com>
- apply patch from Thomas Fitzsimmons <fitzsim@cygnus.com> to fix compile
  problems when BX_SUPPORT_PAGING and BX_USE_TLB are turned off
- fix bug introduced in 1.2.1 which caused spurious exceptions.
  See patch #439314, Exception 1 (debug) on HALT, from
  thomas.petazzoni@meridon.com.
- add panic in ctrl_xfer32.cc where the IRET32 implementation is broken.
  This only happens if you are NOT in vm8086 mode or protected mode.
  The intent is to warn people when they are getting bad emulation, and
  encourage people to report how they got to that point.
- apply patch from Santiago Bazerque.  See this bug report:
  [ #463018 ] retf not removing parameters sometimes
- fix bug [ #461730 ] IRETD causes problems if NT-flag is set
  reported by Peter Lammich.
- apply patch [ #455014 ] CR0 bug in 80486, described as:
  > In the register CR0, when the bit PM is enabled, the bit 4 is 0
  > when should be 1.
- apply patch from Mike Rieker <mrieker@o3one.org> associated with this bug
  report: [ #480422 ] gdt 'accessed' bit
- in task_switch when it tried to ensure that the old TSS was paged in,
  it actually used the new TSS address, fixed.
- updated the instrumentation code, and added a working example.  To try
  it, configure --enable-instrumentation=instrument/example1.  Then when
  you run bochs, you will get one line for each instruction PC and for
  each I/O access in a new file called bxevent.txt.
- set a bit in the CMOS that says the processor has an FPU.  This is
  from patch [ #455006 ] Device byte is not initialized aptly.
  Author did not leave their name.
- add logging code to the "null ethernet" which does not require host OS
  support.  All this does is print the outgoing packets from the guest OS.
- cleanup of log functions (Todd Fries)
- add BX_ERROR for every command in ATAPI-6 that bochs does not support.
  I still need to do add some commands from older specs that are obsolete
  (and not listed) in ATAPI-6.  Commands that aren't in the spec will still
  panic.
- only put 0xf into the 2nd hard disk field when the cdrom is not present.
  This is a patch from Volker Ruppert <Volker.Ruppert@t-online.de>, who
  comments: "The fdisk command reports an unusable second harddisk if the cdrom
  is enabled. This patch helps, but I don't know if it is the right way."
- make hard disk code return error codes when data is not available instead
  of just panicing.  In particular, if the logical sector is out of bounds
  or the disk image cannot be read/written at the desired offset, we now
  abort the ATA command and return an error code.  Many of the old BX_PANIC
  messages are turned to BX_ERROR, so they will still appear in the
  log, but now the device model will try to communicate this fact to
  the OS instead of simply giving up.
- don't blindly reject odd length atapi commands.  There are cases when
  it's really ok according to ATA-4.
- for big endian machines, reversed the bit fields in interrupt_reason.
  This was pointed out by Nicholai Benalal.
- extended keyboard improvements by Dave Poirier
- major mouse patch from Dave Spring, that implements several missing 
  mouse modes.
- commit keyboard patch from David Haslam <dch@sirius.clara.co.uk>
  posted to mailing list, that addresses the problem of each key press
  printing ^@.  See cvs log for details.
- mouse performance fixes by Greg Alexander and Robb Main
- NE2000 fixes by Frode Vatvedt Fjeld, ecelca@yahoo.com, Greg Alexander,
  and angelos@openbsd.org.
- fix bug [ #468340 ] pic:slave: OCW3 not implemented.  Some event handling
  code appeared in the master pic but not the slave pic.
- fix compile problems in SB16 code, related to fpos_t being treated as 
  an integer.
- patch from Volker Ruppert <Volker.Ruppert@t-online.de> to fix
  midi output file so that winamp can play it.
- some cleanup of serial code by Todd Fries and Volker Ruppert, but it
  doesn't work yet.

X Windows specific:
- commit patch from David Haslam <dch@sirius.clara.co.uk>
  [ #455763 ] Cursor trail with DOS Edit/Minix vi
- error for missing fonts now points to the documentation
- new option --enable-idle-hack, by Roland Mainz, which makes Bochs more
  friendly toward other processes when its CPU is idle.  Presently, 
  this option is specific to X windows.

Win32 specific:
- now Windows 95/98/ME can read the physical cdrom (Don Becker)
- The default configuration for Win32 VC++, given in .conf.win32-vcpp,
  now enables the NE2000 and renames all .cc files to .cpp.  This keeps VC++
  happy but may make it hard to use CVS.
- The default configuration for Cygwin, given in .conf.win32-cygwin, now
  enables cdrom and SB16.
- See "new docs" on the web site for compile instructions for VC++ and Cygwin.
- The sources include a VC++ workspace, in addition to the old "nmake"
  makefile.
- ethernet support (emulated NE2000 card), coded by Don Becker.  This
  implementation requires a library called WinPCap, which you can 
  download from http://netgroup-serv.polito.it/winpcap.
- new utility called niclist.exe which lists the ID number of all your network
  cards (well probably you just have one).  The ID be used when setting up your
  .bochsrc.
- patch [ #466403 ] make text colors more accurate.  The author did not leave
  his/her name.
- fix GUI bug [ #452159 ] win32: mouse stuck if bochs win partly off screen
  Now we center the mouse periodically, whether or not the mouse has
  wandered outside of the window or not.
- event handler recognizes the extended keycode flag
- fixes for raw floppy and floppy disk images (Don Becker)

Linux specific:
- Ethernet (emulated NE2000 card) now works in Linux!  Contributed by
  splite@purdue.edu.  This has been tested using host OS kernel 2.2.14, and
  works with telnet, ftp, irc, lynx, etc.  Because it is a packet filter
  solution, you aren't able to talk to the host machine, only to other 
  machines on the network.  
- The default configuration for Linux, given in .conf.linux, now enables
  the NE2000 model.
- RPM build process configures with --prefix=/usr so that everything is
  installed in /usr/bochs instead of /usr/local/bochs.
- DLX Linux disk image is now installed so that only root can write it, to
  avoid security problems.  When you run the bochs-dlx script, it creates a
  local copy in your home directory and then runs it.
- code that determines the capacity of a cdrom now works for both ATAPI
  and SCSI drives (splite@purdue.edu)
- applied patch from bochs@sigint.cs.purdue.edu.  The comments are:
  > The Linux 2.4.5 CD-ROM driver sends a READ_DISC_INFO command which caused
  > an "unrecognized ATAPI command" panic.  Looks like READ_DISC_INFO is only
  > recognized by CD-R and CD-RW drives, so I ignore it for now.

Amiga MorphOS specific:
- Bochs now compiles and works on Amiga MorphOS.  Configure with
  --with-amigaos.  For AmigaOS only, see .bochsrc for use of fullscreeen and
  screenmode options.  The Amiga MorphsOS is written and maintained by
  Nicholai Benalal <nicholai@chello.se>.
- raw cdrom supported if you configure with --enable-cdrom

BeOS specific:
- Bochs compiles and works on BeOS.  Configure with --with-beos.
  Bernd Thorsten Korz <bernd.korz@insidebeos.de> maintains the BeOS port.
- raw cdrom supported if you configure with --enable-cdrom

MacOS X specific:
- Bochs now compiles and works on MacOS X.  Configure with --with-carbon.
  Emmanuel Mailliard <e.rsz@libertysurf.fr> ported the Macintosh code to the
  Carbon API.
- The MacOS X application is built using (gasp) mkdir, copy, and rez.
  Surely this is not the right way, but it works.
- raw cdrom supported if you configure with --enable-cdrom

RFB mode:
- apply patch.rfb-mouse by MURANAKA Masaki (monaka@users.sf.net)
  see this source forge bug [ #457968 ] Strange mouse motion on RFB
- add a retry loop in RFB code, so that if port 5900 is not available
  it can try 5901, etc.

Bochs Debugger:
- do a vga update whenever you print a debugger prompt.
- added debugger command "info fpu" that prints the FPU registers.  If you
  do "info all" you get cpu and fpu registers.
- added debugger command "info ne2k" which prints all the registers
  of the NE2000 model
- add ability to do register tracing and flag tracing (Dave Poirier).
  Try the trace-reg-on and trace-reg-off commands.
- instruction trace now includes time ticks
- fixed problems in which bochs compiled with debugger measured time 
  differently from bochs compiled without debugger.  Also when instruction
  trace was enabled, breakpoints and control-C did not work.  Also,
  breakpoints at the beginning of an interrupt handler did not work.

-------------------------------------------------------------------------
Changes in 1.2.1 (June 12, 2001):
- more work on makefile for building RPMs
- [ #432382 ] build debian packages patch
  add build/debian directory from Rob Lemley <rjlemley@calypsoblue.org>
  which allows us to make Debian packages!
- optimize for speed when simulating one processor.  Now 1-processor
  performance should be equivalent to 1.1.2.
- [ #425640 ] sb16 assumes fpos_t is long int
  This fixes compiles of iodev/sb16.cc on linux systems with newer libraries
  in which fpos_t is not an integer.
- [ #432488 ] SMP:assert "n_logfn < MAX_LOGFNS" fails
  increase MAX_LOGFNS since we ran out of them on an SMP simulation with
  4 processors
- changes to compile clean on cygwin:
  - don't use the WIN32 snprintf define for cygwin
  - add ssize_t definition for cygwin
  - only compile "struct timeval tval" if select is available
    on that platform.
- [ #432491 ] SMP: CPUID says no APIC feature
  clean up inconsistent use of BX_SUPPORT_APIC and BX_APIC_SUPPORT, which
  caused the CPUID to report no APIC was present
- [ #431025 ] --enable-external-device-models broken
  removed configure options for external-device-models and 
  external-cpu-memory.  These don't work and aren't going to be fixed.
- [ #429448 ] configure: -lreadline when not there
  Now configure allows you to choose not to use readline, even if it's found
  on your system.
- [ #428915 ] apply extended keyboard patch
  extended keyboard patch by Dave Poirier <eks@void-core.2y.net>
- [ #428626 ] if no X11 found, configure&make fails
  Now configure halts if X windows is selected but no X libraries are found.
- updated rombios to version 1.13.  This fixes several problems:
  - [ #430472 ] DOS HIMEM "A20 line" error
    This problem was apparantly caused when Bryce added a function that prints
    the BIOS version, and he called it too early in the boot process.  Now the
    same function is called later, and it doesn't break the A20.
  - [ #431010 ] SMP structure overwritten in v1.2
    SMP structures were getting overwritten by BCC-generated data, 
    preventing SMP operating systems from detecting that other processors
    were available.
  - [ #431016 ] bios: SMP struct has wrong entry count
    SMP structure had the wrong entry counts
- very minor doc updates (typos, replace broken link to mtools info)
- quit when the user clicks the power button, even if they have disabled
  panics.
- win32 now defaults to having mouse capture mode turned off.  For new users,
  it would be distressing for their mouse cursor to disappear until they
  pressed F12.
- [ #428222 ] vga font not installed
  added script called "install-x11-fonts" which should help people install
  the VGA font on X windows systems, if it isn't already there.

Changes in 1.2 (June 3, 2001):
- [ #427259 ] rombios HALT calls don't print
  Fixed bios/rombios.c HALT macro so that it writes the line number of the
  panic to the PANIC_PORT (port 0x400) and then does NOT do a halt 
  instruction.  Also changed iodev/unmapped.cc so that the line number written
  to PANIC_PORT is displayed as a BX_PANIC message.  Because the HALT
  macro now triggers the normal panic behavior, it can be controlled by
  the bochsrc.
- [ #429016 ] crash if no hard drive
  rombios used to call HALT macro if no hard drive was found. Now it only
  calls HALT if a hard drive has an illegal geometry.
- [ #425388 ] include source for simple disk img tool
  [ #428478 ] mkimg tool creates image 1 byte too big
  Added bximage tool, which makes empty floppy and hard disk images.
  It is now included in the top level Makefile, so it will get built
  by default on all platforms.
- [ #426036 ] eth_fbsd.cc compile problem on solaris26
  added configure test so that "configure --enable-ne2000" only
  includes the Berkeley Packet Filter code (eth_fbsd) if the header
  file <net/bpf.h> can be found.  If you don't have BPF the ne2000
  will not actually move packets, but at least it will compile clean now.
- [ #428214 ] 1.2.pre1 need documentation for binaries
  Write windows and linux specific documentation to be installed in
  binary releases.
- [ #429258 ] disable RESET for version 1.2
  Since soft reset was not completely working, I reverted the reset patch.
  Now it does panics on reset instead of trying to reboot, as the old
  bochs versions did.
- [ #428222 ] Should the linux RPM install vga font?
  now font/vga.pcf will be installed in the RPM package
- [ #429020 ] stop renaming the BIOS!!!
  new BIOS changes are now in BIOS-bochs-latest, instead of a BIOS 
  whose name changes every time we change anything!  To help distinguish
  different BIOS versions, the BIOS now prints its RCS Id into the
  log file.
- [ #428625 ] compile problem if SHOW_IPS is on
  removed extra paren that broke SHOW_IPS
- [ #428219 ] PCI doesn't compile with SMF=1
- [ #429375 ] pthreads detection broken
- [ #429073 ] configure: if no X11, makes bad config
- [ #429229 ] install current .bochsrc in binary rels
- install Tim's man pages on linux RPM
- BIOS prints messages in log in case of boot failure
- rewrote instructions for compiling in win32 (win32.txt)
- fixed link in HTML changelog.html to point to the real sources on SF.
- added missing LOG_THIS definition to gui/nogui.cc and gui/rfb.cc
- added additional check for null pointer in debugger exit routine
- added diskd to .bochsrc

Changes in version 1.2-pre1 (May 25, 2001):
- major cleanup of .bochsrc
- major cleanup of stderr output: prints bochs version information when
  starting, and at the end it tries to print the message that caused 
  bochs to quit.
- two hard disk support (diskd).  At present, you cannot have two 
  hard drives and a cdrom at the same time, because there is only
  one IDE controller with two channels.
- split hard disk support allows different partitions to be stored in
  different image files
- two new GUI choices: term mode and RFB mode.  Term is a text-only
  interface, and RFB creates a server that can be accessed using
  the AT&T VNC viewer.
- now Bochs can simulate an SMP machine, if you configure with
  --enable-processors=N.  Configuring more than one processor has
  a major performance impact, so the default is 1 processor.
  See SMP documentation for more details.
- to make SMP work, bx_mem and bx_cpu have been replaced with
  bx_mem_array[] and bx_cpu_array[].  The cpus are referenced through
  the BX_CPU(n) macro and memories through the BX_MEM(n).  Normal
  mode has one cpu and one memory, SMP mode has multiple cpu's and 
  one memory, cosimulation mode has multiple cpus and multiple memories.
- use --enable-cpu-level=6 to make Bochs claim to be a Pentium Pro.
  The only feature that requires CPU level 6 is apic support.
- new logging system by Todd Fries, which has 4 levels of event
  severity (panic, error, info, debug).  There are new .bochsrc
  options that control what action to take when a 
  panic/error/info/debug event occurs.
- now searches for .bochsrc, bochsrc, bochsrc.txt, and (on unix only)
  $HOME/.bochsrc.
- use GNU readline library if --enable-debugger is on, as long as readline
  can be found on the machine
- configure checks for existence strtoull and strtouq. if neither exists, 
  Bochs uses its own implementation
- applied patches from Cliff Hones <cliff@aonix.co.uk> to fix up the
  rombios.  This includes many improvements, which you can list by
  doing "cvs log -r 1.6 bios/rombios.c" or looking at cvsweb.
- added suggested geometries of larger disks to the documentation
- this is the first release to have official binary packages for win32
  and Linux.  There is a new "make rpm" in the top-level Makefile which
  will create an RPM of the current bochs directory.  To use this,
  become root and type "configure; make rpm".
- applied some FreeBSD patches from Maxim Sobolev (cdrom and serial).

Changes in version 1.1.2 (bugfix3, May 16, 2001):
- updated Elpin VGA BIOS to version 2.40, and changed pointer in .bochsrc
- fixed .conf.x86 script so that it uses c++ instead of egcs for C++ files
- now Makefile targets that recurse into subdirectories use double colons,
  so that it will always recurse into subdirectories.  Now a single make
  command should notice a modified source file in a subdir.
- fixed bug in bx_panic.  If BX_PANIC_IS_FATAL==0 and a (non-fatal) panic 
  occurs, it used to call bx_atexit() and then return.  It should never
  call bx_atexit, which starts to shut down the simulator, unless it's
  really going to quit!
- support 2.88 MB floppy disks
- since dataseghack is checked in as non-executable, invoke it with 
  "csh dataseghack"
- double fault patch from Thomas Petazzoni <thomas.petazzoni@ifrance.com>,
  sourceforge patch #423726.
- removed -fno-builtin from fpu makefiles
- redefine u_char, u_short, etc. in order to not conflict with system
  definitions of these same types.
- in cdrom.cc, remove the extern "C" { } structure around some of the
  header files.  This is no longer necessary.
- do not panic on hard disk command 0x1f2 (read sector count)
- in keyboard.cc:
  - apply Todd Fries' reset patch
  - recognize most of the "Grey" insert/delete/home/end/etc. keys the
    same as keypad keys.
  - removed panic on "kbd_ctrl_to_kbd(): got value of 0x??"
  - implement mouse command 0xf6 (set defaults)
- apply Suboner@aol.com's Xwindows timing patch from
  http://sourceforge.net/tracker/index.php?func=detail&aid=418730&group_id=12580&atid=312580
- remove all patches from patches subdir which have already been applied.
  The remaining ones are under consideration but not applied.

Changes in version 1.1.1 (bugfix2, April 9, 2001):
- in soundwin.cc, arg 3 should be typecast to LPWAVEFORMATEX
- in fpu_entry.c, Bryce mistyped his own initials!
- in configure.in and configure, define good defaults for VC++
   #define BX_64BIT_CONSTANTS_USE_LL 0
   #define inline __inline
   #define BX_NO_EMPTY_STRUCTS 1
   #define BX_NO_ATTRIBUTES 1
   #define BX_HAVE_HASH_MAP 0
- in config.h.in, fixed typo in #error message


Changes in version 1.1 (bugfix1, April 6, 2001):

(FIXED, patch #414360: update copyrights)
update headers.  Change copyright to 2001, replace config.h.in header with
the standard mandrake header that every other file uses.

(FIXED, patch #414356: inlines)
make macro to replace inline and static/extern keywords.  Then make 
define the macro appropriately based on configure.

(FIXED: patch #414234: macos-no-strdup)
--with-macos should force HAVE_STRDUP=0.

(FIXED, patch #403027: Fix mouse bugs in Linux and BSD)
Linux and BSD (maybe others) cause panic in mouse code.

(FIXED, patch #413851: const64bit patch)
VC++ does not allow "LL" after 64-bit constant.

(FIXED, patch #413859: fabs symbol conflict)
fpu code contains fabs, which conflicts with math library fabs.

(FIXED, patch #403004: Implement aborts on a few SET FEATURE commands...)
Implement aborts on a few SET FEATURE commands for ATA.

(FIXED, patch #402991: Update to iodev/vga.cc to add 3c3h read support)
Implement VGA enable register, at 0x3c3.

(FIXED, patch #403027: Fix mouse bugs in Linux and BSD)
Mouse panic in linux/BSD: 
KBD: io write 0x64: command = 0xD3(write mouse outb)

(FIXED, patch #414229: panic-is-fatal)
Allow user to decide if panic is fatal, or just a warning

(FIXED, patch #414230: sun-cdrom)
Support Sun CDROM

(FIXED, patch #413574: portable1)
there are cases where a pointer is cast to a 32-bit int,
then later cast to a pointer and dereferenced, which crashes any 64-bit
machine.

(FIXED, patch #413574: portable1)
some machines have no snprintf or strtoull.  include a replacement function
when needed.

(FIXED, patch #413574: portable1)
Some compilers don't allow "typedef struct { } foo;"

(FIXED, patch #413574: portable1)
Some people don't have hash_map.h, used in dbg_main.cc.  Disable this code
if hash_map.h not found.

(FIXED, patch #413574: portable1)
Some compilers can't handle labels at the end of a block, as in
   void main () { /*code*/ label: }  

(FIXED, patch #413574: portable1)
Most compilers can't handle __attribute__.  Use macro to define it away.

(FIXED, patch #413574: portable1)
if --enable-debugger, turn on --enable-disasm too.

(FIXED, patch #413574: portable1)
ome compilers can't handle any chars after an #endif

(FIXED, patch #413574: portable1)
wrong type arg1 of bx_dbg_watch and bx_dbg_unwatch.  The code in
lexer.l was calling it with integers (not booleans)

(FIXED, patch #413574: portable1)
in fpu code, "setcc" macro was implemented with braces inside parens,
which some compilers don't understand.

(FIXED, patch #413574: portable1)
in fpu_entry.c, FPU_load_int32 was consistently called with arg1 of
type (s32 *), but should be (u32 *)

(FIXED, patch #413574: portable1)
comment out sigcontext structure in fpu/stubs/asm/sigcontext.h because
it conflicted with sigcontext of other machines.  This struct was never
used by bochs anyway.

(FIXED, patch #414046: portable2)
move definition of missing library functions into osdep.h and osdep.cc,
include contents of macutils*.

(FIXED, patch #414061: win32-rawcd)
CDROM drive letter for WIN32 should not be hardcoded.

(FIXED, patch #414060: win32-rawfloppy)
Bypass fstat when opening WIN32 raw floppy disk.

(FIXED, patch #414226: pit-panic)
WinME install dies with panic:
bochs: panic, pit: outp(43h): comm Bh, mode 00, bcd 00 unhandled
I think I had a similar problem.  All three timers should support modes
0, 2, and 3.  Other modes really aren't implemented.