Latest release: Bochs 2.5.1

Bochs 2.5.1 is a bugfix release. Here is the summary of changes :

• CPU / CPUDB
  • ! Added Athlon64 (Venice) configuration to the CPUDB
  • BMI: fixed EFLAGS after BMI instructions
  • MSR: access to AMD extended MSR space was impossible due to a bug in RDMSR/WRMSR
  • VMX: fixed VMFUNC instruction behavior to align with Intel SDM revision 041
  • VMX: fixed Bochs PANIC when doing I/O access crossing VMX I/O permission bitmaps
  • VMX: fixed VirtualBox VMX guest Guru Meditation - FS.BASE got corrupted after saving/restoring unusable FS selector
  • VMX: fixed VirtualBox failures with VMX+EPT enabled
  • Better report of supported CPUID features when not using pre-defined CPUID profile
• Debugger / Instrumentation
  • fixed typo - closing SF bug [3461405] step all command fails in SMP mode
  • instrumentation: added special indication for indirect call/jump
• Configure and compile
  • fixed compilation err in instrumentation call (tasking.cc)
  • fixed compilation err with x86 hw breakpoint enabled and CPU_LEVEL < 6
  • fixed compilation issue under win32 --with-nogui
  • added missing dependencies for cdrom_osx.o
  • removed very old deprecated configure options from configure script
• I/O Devices
  • fixed possible failures of PCI DMA transfers
  • VVFAT: several fixes in the optional write support (passes test with XP)
  • USB UHCI: some fixes to make it work in XP guest
  • removed devices 'acpi', 'ioapic' and 'pci_ide' from optional plugin control to avoid trouble
• Config interface / GUI and display libraries
  • added VMX .bochsrc option to control VMX support on runtime
  • fix for x86-64 .bochsrc option parsing (patch from @SF)
  • fix for @SF bug: Crash on WIN2K - ID: 3454214
  • added 'nokeyrepeat' option for the SDL and win32 gui

The binary packages for Linux and Windows are built with these featues :

• x86-64 emulation with all optimizations enabled
• devices:
  • chipset: PCI, ACPI
  • video: Bochs VBE and Cirrus SVGA
  • sound: SB16
  • network: NE2000 (ISA/PCI)
  • USB: OHCI, UHCI and 6 device types
• Display libraries:
  • Linux: nogui, rfb, sdl, term, wx, x
  • Windows: nogui, rfb, win32

Details on what has changed since version 2.5


Previous release: Bochs 2.5

Nine months after the last intermediate one and the switch to SVN version control we have a new stable release. Here is the summary of changes :

• Fully configurable CPU to emulate with a single .bochsrc option !
• 10% (ST) to 50% (SMP) CPU emulation speedup !
• Implemented support for new x86 ISA extensions, Bochs is aligned with latest published Intel Architecture Manual (rev 040, AVX rev 011):
• XSAVEOPT, AVX/AVX2/FMA/F16C, BMI1/BMI2, SMEP, INVPCID, TSC-Deadline
• VMX: VMX Preemption Timer, Pause Loop Exiting and VM Functions
• Implemented support for AMD SSE4A/XOP/FMA4/TBM instruction sets
• Networking: introduced new networking module 'slirp'
• Harddrive: fixed buffer overflow causing Bochs crash in LBA48 mode
• VGA: Added PCI ROM support to cirrus and pcivga and moved ROM loading for the ISA case to the vga code (SeaBIOS now usable by Bochs)
• Sound: ported ES1370 soundcard emulation from Qemu
• Continuing configure rework, check for more removed configure and .bochsrc options and their replacements !
• LGPL'd VGABIOS updated to version 0.7a

Details on what has changed since version 2.4.6


Bochs Binary and Source Releases

The latest release of Bochs is available in these file formats :

• Win32 binary NSIS installer package (EXE)
• Win32 binary with x86-64 CPU + SMP support (ZIP) - Bochs installation is required
• Win64 binary - Bochs installation is required
• Linux binary RPM (32 / 64 bit)
• Platform independant source package (TAR.GZ)
• Win32 specific source package prepared for MSVC (ZIP)
• Linux source RPM

You can download any release since March 2001 on the Releases Page.


Download SVN Snapshot

SVN Snapshot: Bochs, like many other open source projects, uses SVN (Subversion) to keep track of source code. Unlike the current release, the SVN version of the sources contains everything the developers have written to this date, and it can change daily (or even hourly). As a result, the SVN version of Bochs will have more features and bug fixes than the release, but also it may be somewhat less stable. You can decide if you prefer to go exploring and try out our newest code, or stick with the better-tested release.

The SVN snapshots are provided as a convenience only. Of course, you could also get the same information using SVN itself. Some of the benefits of using SVN directly are: you can get any release or version, view the log messages that say what files were changed, and make patches very easily with "svn diff -u". Last Modified on .