Changes in 2.4.5 (April 25, 2010):

Brief summary:

• Major configure/cpu rework allowing to enable/disable CPU options at runtime through .bochsrc (Stanislav)
  
• Bugfixes for CPU emulation correctness and stability
  
• Implemented X2APIC extensions (Stanislav)
  
• Implemented Intel VMXx2 extensions (Stanislav)
  
  • Extended VMX capability MSRs, APIC Virtualization, X2APIC Virtualization, Extended Page Tables (EPT), VPID, Unrestricted Guests, new VMX controls.
  
  
• Implemented PCLMULQDQ AES instruction
  
• Extended Bochs internal debugger functionality
  
• USB HP DeskJet 920C printer device emulation (Ben Lunt)

Detailed change log:

Configure rework

• Deprecate --enable-popcnt configure option. POPCNT instruction will be enabled automatically iff SSE4_2 is supported (like in hardware).
  
• Make --ignore-bad-msrs runtime option in .bochsrc. Old --ignore-bad-msrs configure option is deprecated and should not be used anymore.
  
• Enable changing part of CPU functionality at runtime through .bochsrc.
  
  • Now you could enable/disable any of SSEx/AES/MOVBE/SYSENTER_SYSEXIT/XSAVE instruction sets using new CPUID option in .bochsrc.
    
  • When x86-64 support is compiled in, you could enable/disable long mode 1G pages support without recompile using new CPUID option in .bochsrc.
    Configure options:
    --enable-mmx, --enable-sse, --enable-movbe, --enable-xsave,
    --enable-sep, --enable-aes, --enable-1g-pages
    are deprecated and should not be used anymore.
  
  
• Local APIC configure option --enable-apic is deprecated and should not be used anymore. The LAPIC option now automatically determined from other configure options. XAPIC functionality could be enabled using new CPUID .bochsrc option.
  
• Changed default CPU configuration (generated by configure script with default options) to BX_CPU_LEVEL=6 with SSE2 enabled.

CPU

• Implemented PCLMULQDQ AES instruction
  
• Implemented X2APIC extensions / enable extended topology CPUID leaf (0xb), in order to enable X2APIC configure with --enable-x2apic
  
• Implemented Intel VMXx2 extensions:
  
  • Enabled extended VMX capability MSRs
    
  • Implemented VMX controls for loading/storing of MSR_PAT and MSR_EFER
    
  • Enabled/Implemented secondary proc-based vmexec controls:
    - Implemented APIC virtualization
    - Implemented Extended Page Tables (EPT) mode
    - Implemented Descriptor Table Access VMEXIT control
    - Implemented RDTSCP VMEXIT control
    - Implemented Virtualize X2APIC mode control
    - Implemented Virtual Process ID (VPID)
    - Implemented WBINVD VMEXIT control
    - Implemented Unrestricted Guest mode
    In order to enable emulation of VMXx2 extensions configure with
    --enable-vmx=2 option (x86-64 must be enabled)
  
  
• Bugfixes for CPU emulation correctness
  
• Fixed Bochs crash when accessing the first byte above emulated memory size

Internal Debugger

• Introduced range read/write physical watchpoints
  
• Allow reloading of segment registers from internal debugger
  
• Improved verbose physical memory access tracing

BIOS

• Fix MTRR configuration (prevented boot of modern Linux kernels)
  
• Fix interrupt vectors for INT 60h-66h (reserved for user interrupt) by setting them to zero
  
• Fix BIOS INT13 function 08 when the number of cylinders on the disk = 1

I/O Devices

• USB HP DeskJet 920C printer device emulation (Ben Lunt)

Misc

• Updated Bochs TESTFORM to version 0.5

SF patches applied
[2864402] outstanding x2apic patches by Stanislav
[2960379] Fix build with -Wformat -Werror=format-security by Per Oyvind Karlsen
[2938273] allow instrumentation to change execute by Konrad Grochowski
[2926072] Indirection operators in expressions by Derek Peschel
[2914433] makesym.perl misses symbols by John R. Jackson
[2908481] USB Printer by Ben Lunt

these S.F. bugs were closed/fixed
[2861662] dbg_xlate_linear2phy needs to be updated
[2956217] INT13 AH=8 returns wrong values when cylinders=1
[2981161] Allow DMA transfers to continue when CPU is in HALT state
[2795115] NX fault could be missed
[2964824] bad newline sequence in aspi-win32.h
[913419] configure options and build process needs some work
[2938398] gdbstub compile error with x86_64 enabled
[2734455] shutdown/reset type 05 should reinit the PICs
[1921294] extended memory less than 1M wrong size
[1947249] BX_USE_EBDA_TABLES and MP table placement
[1933859] BX_USE_EBDA_TABLES and memory overlapping
[2923680] "help dregs" is a syntax error
[2919661] CPU may fail to do 16bit near call
[2790768] Memory corruption with SMP > 32, Panic BIOS Keyboard Error
[2902118] interrupts vectors 0x60 to 67 should be NULL !
[2912502] Instruction Pointer behaving erratically
[2901047] Bochs crashed, closed by guest os
[2905385] Bochs crash
[2901481] Instruction SYSRET and SS(PL)
[2900632] Broken long mode RETF to outer priviledge with null SS
[1429011] Use bx_phyaddr_t for physaddr vars and bx_adress for lin adr

these S.F. feature requests were closed/implemented
[2955911] RPM preuninstall scriptlet removes /core
[2947863] don´t abort on unrecognised options
[2878861] numerics in the disassembler output
[2900619] make more CPU state changeable