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Latest release: Bochs 3.0
Bochs 3.0 is a major release. Here is the brief summary of changes :
- Include Bochs debugger support in all release binaries. Bochs internal debugger and Bochs GUI debugger are compiled in by default and there are no special Bochs binaries with internal debugger support anymore.
- Integrated softfloat3e library replacing older softfloat2a fpu-emulation code
- Bugfixes for CPU emulation correctness (critical bugfixes for VMX, WAITPKG, LASS, XSAVEC/XSAVES, CPUID and SHA1 ISA implementation)
- Added emulation of missing AMD 3DNow! instructions
- Implemented AVX512_FP16 Intel instruction set based on softfloat3e library (enabled in Xeon Sapphire Rapids CPU definition)
- Implemented MONITORLESS MWAIT instructions support
- Implemented initial support for AVX10_1 + AVX10_2 ISA extensions and AVX10 CPUID leaf 0x24 (AVX10_1 first to be enabled in Xeon Granite Rapids)
- Implemented AMX-TF32 and AMX-AVX512 ISA extensions
- Implemented RAO-INT ISA and MSR_IMM ISA extensions
- CPUID: Added new CPU definitions: for i386, i486DX4, AMD Athlon XP and Intel Core i5 Arrow Lake CPUs
- CPUID: Support for enabling/disabling of one or more CPU features from CPUID configuration (see "add_features" and "exclude_features" in bochsrc sample and documentation)
- ! CPUID: Old bx_generic CPUID model is deprecated with all associated .bochsrc CPUID configuration options, use pre-defined CPU models instead
- Several fixes and improvements for the Cirrus and Voodoo emulation
- USB: Added the USB Debugger support for xHCI and UHCI (Windows / GTK3)
- Added USB boot option (requires i440fx.bin BIOS)
- LGPL'd VGABIOS updated to version 0.9c (Cirrus / VBE fixes and extensions)
- Added i440fx.bin BIOS written by Ben Lunt (https://github.com/fysnet/i440fx)
- Documentation updates and fixes after transition to GIT
The binary packages for Linux and Windows are built with these features :
- x86-64 emulation with all optimizations enabled
- devices:
- chipset: PCI (i430FX / i440FX / i440BX), ACPI
- video: Bochs VBE, Cirrus SVGA and 4 Voodoo models
- sound: SB16 (ISA) and ES1370 (PCI)
- network: NE2000 (ISA/PCI) and E1000 (PCI)
- USB: OHCI, UHCI, EHCI, xHCI and 8 pluggable device types
- other: game port, bus mouse
- Display libraries:
- Linux: nogui, rfb, sdl2, term, vncsrv, x
- Windows: nogui, rfb, win32
Details on what has changed since version 2.8
Previous release: Bochs 2.8
Bochs 2.8 is the first release after SVN to GIT transition hosted on GitHub.
Here is the brief summary of changes :
- Bugfixes for CPU emulation correctness (MONITOR/MWAIT, VMX/SVM, x87, AVX-VNNI, AVX-512, CET)
- Critical CPU emulation bugfixes for SHA and GFNI instructions, ADOX and XRSTOR/XRSTORS instructions (prevented boot of Win10)
- SVM: Implemented SVM VM_CR_MSR and INIT redirect (required for booting SMP with SVM)
- Implemented VMX MBE (Mode Based Execution Control) emulation required for Windows 11 guest
- Implemented VMX 'Shadow Stack Prematurely Busy' control
- Implemented MSR IA32_SPEC_CTRL Virtualization VMX extension
- Implemented Posted-Interrupt Processing VMX extension emulation
- Implemented Linear Address Separation (LASS) extension
- Implemented 57-bit Linear Address and 5-Level Paging support
- Implemented User-Level Interrupt (UINTR) extension
- Implemented Intel AMX extensions (AMX, AMX_INT8, AMX_BF16, AMX_FP16, AMX_COMPLEX)
- Implemented Intel instruction sets:
- MOVDIRI/MOVDIR64B, AVX512_BF16, AVX IFMA52, VNNI-INT8/VNNI-INT16, AVX-NE-CONVERT, CMPCCXADD, SM3/SM4, SHA512, WRMSRNS, MSRLIST, WAITPKG, SERIALIZE
- CPUID: Added Xeon Sapphire Rapids CPU definition
- Improved 64-bit guest support in Bochs internal debugger, added new internal debugger commands
- Bochs debugger enhanced with new commands (setpmem, loadmem, deref, ...)
- Enhanced magic breakpoint capabilities. Refer to user documentation for more details.
- Updated Bochs instrumentation examples for new disassembler introduced in Bochs 2.7 release
- USB: Fixed/added USB 2.0 Compliance to all devices. Hub still needs a few additions
- USB: xHCI: added the ability to have more than one model of xHCI hardware. Currently there are two.
- USB: Added experimental MSD UASP emulation
- USB: Added OHCI as an EHCI Companion option. Now allows UHCI or OHCI specified as a configuration parameter.
- Disk images: Allows large VHD image files
- Fixed and enhanced the Floppy Disk emulation, VGA emulation fixes
- Expand maximum resolution for Banshee and Voodoo 3 from 1600x1280 to 1920x1440
- LGPL'd VGABIOS updated to version 0.9a (several VBE fixes / additions)
- Documentation updates and fixes
Details on what has changed since version 2.7
Bochs Binary and Source Releases
The latest release of Bochs is available in these file formats :
- Win64 binary NSIS installer package (EXE)
- Linux binary RPM (64 bit)
- Platform independant source package (TAR.GZ)
- Win32 specific source package prepared for VS2019 (ZIP)
- Linux source RPM
You can download any release since March 2001 on the
Files Page on SF.
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