Author: Kevin Lawton

# ChangeLog

- ## bochs-2000_0104c

  - FPU mods:
    - Integrated new FPU emulator mods from Bill Metzenthen.
    - Bill ported x86 specific assembly files to C.
    - I helped port the FPU emulator to work on big-endian machines. (tested on SPARC so far)
    - The FPU emulator is now integrated into the main bochs source code (in fpu/) for ease of compilation.
    - Tested on x86 and SPARC.
    - The '--enable-fpu' option no longer needs an argument.

- ## bochs-991114a

  - CDROM emulation works on win32. Mods from Nick Behnken.
  - Cleaned up some problems with win32 compile with VC++.
  - Fixed ::call_protected() for protected mode call to same level via call gate.

- ## bochs-991107c

  - Sound Blaster 16 emulation.
    - Integrated Sound Blaster 16 emulation from Josef Drexler.
    - Check out sound.html for SB16 notes.
    - Added configure option --enable-sb16=.
  - Started work on special guest driver to host interface, which will ultimately be used by disk/video/network etc drivers to enhance performance in bochs. Not usable yet.

- ## bochs-991102a

  - NT4.0 installs in bochs (Pentium+FPU+CDROM options).
  - Please wait until next release for running NT unless you really need it.
  - Created (incomplete) docs-html/guestNT.html to outline process of installing NT4.0 in bochs.
  - More fixes to ::exception().
  - Fixes to ::stack_return_to_v86().
  - Mods to configure to handle win32 config again.
  - Integrates mods from win32 developers.
  - vga.cc handles variable number of lines in text mode. Updated GUI code for all platforms, to receive number of lines of text in ::text_update().

- ## bochs-991023a

  - Integrated diffs submitted for OpenBSD cdrom support.
  - Fixed up v8086 mode and exception handling.
  - Fixed real-mode handling of IOPL flag WRT POPF/IRET.
  - Fixed handling of a bunch of weird 16/32-bit transitions. In the doing, I ended up recoding the following:
    - Recoded ::exception()
    - Recoded ::interrupt()
    - Recoded ::task_switch()
  - Cleaned up most warnings.
  - Added docs-html/codingguidelines.html. Please peruse it, if you are a code submitter, and would like to comply with my code tyranny. :^)
  - Integrated new submitted Mac build files and gui code.
  - Have a few more issues to take care of before playing in the dynamic translation sandbox again.

- ## bochs-991014a

  - CDROM emulation:
    - New ./configure option '--enable-cdrom'. So far, there is only support for Linux.
    - I created a Linux specific CDROM component. Mostly just ioctl()s needed to access a few functions of the cdrom.
    - Created 'iodev/cdrom.cc' and 'iodev/cdrom.h' which contain the low-level code. Essentially, all the OS specific code is contained in these files.
    - Should be fairly easy to add code for other OSes.
    - Use .bochsrc directive 'cdromd: dev=/dev/cdrom, status=inserted'.
    - Will add an icon for cdrom to the UI later.
    - Tested cdrom emulation running Linux in bochs. Use something like 'mount -r /dev/hdb /mnt/cdrom'. Haven't checked out using it in Windows yet.

- ## bochs-991012a

  - Moved default cpu level to Pentium.
  - Created docs-html/configure.html to explain options to configure.
  - Fixes to high-level CDROM support.
  - Added optional x86 hardware debug support:
    - '--enable-x86-debugger' is a new option to ./configure.
    - This is the debug support offered by an x86 CPU, not the native bochs debugger.
    - Added instruction and data breakpoint capabilities.
    - Added proper RF handling with or without hw debugging.
    - You can configure without this option for more speed.
  - FWAIT now calls FPU emulator like it should.
  - Changes to LMSW.
  - Moved a bunch of initial stderr messages to bochs.out.
  - More Pentium behaviour enhancements.
  - Modified HLT instruction.
  - GRUB now works in bochs and can load programs.
  - Compiled a new wm-FPU-emu version for this bochs version (only very minor mods).
  - Work on further Pentium emulation continues...

- ## bochs-991004a

  - Added partial Pentium emulation:
    - --enable-cpu-level=5 is now possible from ./configure.
    - Default level still at 4 without above option.
    - Win'95 boots and recognizes Pentium emulation.
    - Linux boots and recognizes Pentium emulation.
  - Work on further Pentium emulation continues...

- ## bochs-990925a

  - Generated new BIOS (bios/BIOS-bochs-990925a).
  - Fix to mouse BIOS code (int15h:c2:06:00). The use of local code block/variables is not handled correctly by the bcc compiler. Removed braces, and moved local variable to top level of function.
  - Fix to extended mem access BIOS function (int15h:87). This was killing Minix.
  - Fix to floppy.cc, was reading one extra sector.
  - Fix to Makefiles etc for compiling without floating point.
  - Minix boots again inside bochs. Though, the keyboard code is not yet right for running Minix. For some reason, if you comment out the 2 keyboard ACKs at lines 947 and 966 in iodev/keyboard.cc, it works.

- ## bochs-990923a

  - Fixes to vga.cc for odd VGA graphics modes. Even the Windows'95 splash screen works now! (Craig Ballantyne)
  - Addition of postfix expression evaluator in the debugger. (Hanish Menon)
  - Support for 1.76MB floppies. (Hanish Menon)
  - Bug fix for debugger. (Hanish Menon)

- ## bochs-990920a

  - Fixed bug in crc command from debug prompt
  - Bochs now can be compiled to use wm-FPU-emu, the x87 FPU emulator included in the Linux kernel. It was written by Bill Metzenthen. Look in fpu.html for more info. Added "--enable-fpu=" to configure. For now, this will only work on x86, since wm-FPU-emu has some assembly components.
  - Coded illegal instruction exception for old XBTS and IBTS opcodes.
  - Moved default cpu level to 486.
  - Decoupled main web page from user documentation in "docs-html".

- ## bochs-990907a

  - Fixed bug in rombios.c, new bios is bios/BIOS-bochs-990907a
  - Commented out load32bitOSImage directive in .bochsrc, should not have been left uncommented.
  - Working on Pentium emulation next...

- ## bochs-990708a

  - integrated submitted mods to BeOS gui stuff
  - integrated ne2k emulation (only FreeBSD low-level implemented)
  - integrated mega patches which allow bochs to boot and run NT4/SP4 (simulating a 486sx)
    - - Magic breakpoint
    - - IDE CD-ROM (needs low-level OS stuff for all OSs)
    - - Current time in time0
    - - Instruction based simulation clock
    - - Time breakpoints
    - - Bios improvements [rombios-new.c]
    - - Read/write breakpoints
    - - Mode switch breakpoints
    - - Bugfixes in iret
    - - Bugfixes in the fetch/decode tables
    - - CPUID instruction implemented
    - - Additional support for the AC and ID bits
    - - Intel division 'emulation'
    - - Floating point fixes
    - - INVLPG instruction implemented
    - - Read-modify-write fault behavior fix
    - - Paging bugfixes
    - - Minor LES fix
    - - Interrupt handling bugfix
    - - V86 mode bugfixes
    - - Debugger bugfixes
    - - Sync on cpu implemented
    - - Sync on memory implemented
    - - New debugger commands:
      - trace-on
      - trace-off
      - ptime
      - sb
      - sba
      - diff-memory
      - sync-memory
      - sync-cpu
      - fast-forward
      - info-addr
      - record
      - playback
      - modebp
      - where
      - print-string
      - show
      - print-stack
      - load-symbols
      - watch
      - unwatch
      - phy2log
      - force-check
    - - Mouse support through PS/2 interface
    - - IDE improvements and bugfixes
    - - External disk simulation interface
    - - Keyboard bugfixes
    - - Mouse support in the X11 gui
    - - Improved debug support in I/O devices
    - - VGA improvements and bugfixes
  - New .bochsrc directives: "time0", "magic_break", "ne2k", "cdromd".
  - Task switch bug fixed
  - Integrated Mac port enhancements

- ## bochs-990312b

  - (ftp://ftp.bochs.com/pub/DT/bochs-990312b.tar.gz)
  - First teaser release with dynamic translation framework!
  - Only a few instructions translated, but the framework is coming along nicely. Read "readme.990312b" in the ftp directory above for more info. I include some preliminary performance tests, and you can benchmark bochs with dynamic translation on your own machine.
  - Many more optimizations are possible.
  - Here's an excerpt from the readme file:

                 dynamic translation:        interpreter:
        -------------------------------------------------
        dttest1:      2.4Mips                  1.9Mips
        dttest2:     15.0Mips                  3.2Mips
        dttest3:     10.5Mips                  3.5Mips
        dttest4:     21.2Mips                  3.1Mips

- ## bochs-990219a

  - Converted all read-modify-write instructions to use RMW versions of write_virtual_xyz() & read_virtual_xyz().
  - Addition of Linux/PPC to successful port matrix.
  - Dynamic translation framework is coming along nicely, but not included here yet. I'll include it soon in an upcoming release.
  - Roadrunner OS booted.
  - Integrated many patches from bochs users:
    - Floppy: change line support.
    - Beos: BX_KEY_{LEFT,RIGHT}_ARROW, omitted _ARROW.
    - Bochs port to Cygwin32 without cygnus layer (pure win32 mode).
    - New version of win32.cc, fixes to fetchdecode.cc for win32.
    - Fixes to keyboard.
    - Fixes to X11 cursor problem.
    - Added --enable-port-e9-hack for sending port output to console.
    - New version of macintosh.cc.
    - Changes to allow quoting pathnames in .bochsrc so you can have filenames with spaces.
    - Harddrv.cc: implemented command 0x21 as 0x20.

- ## bochs-990127d

  - Rehashed CPU code in preparation for dynamic translation.
    - Fetch-decode, address resolve, and execute phases are all distinct now.
    - Each instruction gets it's parameters from a pointer to a structure passed to it.
  - Added '--enable-time0' option to configure. Use this only if you want to always start the cmos clock at the same value every time. This is valuable for reproducable runs. It was invaluable to me during cosimulation of this version of bochs against an older one to find bugs.
  - Fix in cpu/paging.cc. Set all segment register descriptor caches to invalid, until they were properly loaded.

- ## bochs-990110b

  - Fixed handling of CR0.val32 shadow to individual flags. Oops, I goofed in bochs-990110a.
  - Redhat 5.2 boot floppy image works again.
  - Incorporated new serial port diffs.
  - Configure senses if you have select(). New macro BX_HAVE_SELECT.
  - Added future configure option '--enable-dynamic-translation'. Don't use this, as its not yet supported.

- ## bochs-990110a

  - Direct floppy disk access fix. I was only checking if file was a character-special file. Added check for block-special file.
  - Minor fixes for Macintosh platform.
  - Small changes to compile bochs on BeOS R4 for x86 using gcc.
  - Fix to timer framework code in pc_system.cc.
  - Fix to iodev/floppy.cc, was using AND instead of OR.
  - Fix to handling of IOPL flag in real-mode.
  - change CR0 reserved bits handling to model actual x86
  - added .conf.beos-x86-R4 script
  - completely rehashed INT 1A BIOS time-of-day services.
  - LOADLIN.EXE no longer complains about being in v86 mode.

- ## bochs-981229a

  - Changed configure option '--with-win32-vc50' to '--with-win32-vcpp'
  - Changed script file '.conf.win32-vc50' to '.conf.win32-vcpp'
  - Integrated Macintosh port of bochs by David Batterham
    - Added '--with-macos' option to configure.
    - Updated web pages with pointer to MacBochs site and local info.

- ## bochs-981222a

  - Generated new bios 'bios/BIOS-bochs-981222a'
  - Serial port: integrated diffs I received which implement a single 8259 UART with IO attached to console
  - Partially integrated mods from some limited i440fx PCI support
    - A few more mods to integrate, DON'T USE YET
    - Added '--enable-pci' to ./configure and BX_PCI_SUPPORT macro
    - Added 'i440fxsupport: enabled=' option to .bochsrc
  - Added settable BX_SHADOW_RAM macro to config.h.in, in case your software counts on C0000..FFFFF being writable.
  - Added 'cmosimage:' option to .bocshrc. If you use this, an image file is read into CMOS registers upon startup. Then certain values are written over, as the IO devices initialize. Not complete yet. DON'T USE YET
  - Added 'newharddrivesupport: enabled=' option to .bochsrc. Set this to 0 or 1. If set to 1, some new hard drive commands are accepted and some behaviour is changed per some diffs I received. After I have time to look at these more, I'll integrate them permanently and get rid of this option.
  - Some fixes to keyboard/floppy/hard-drive support.
  - Rehashed the CMOS code. Now support the RTC, interval timer and alarm clock. This code has not been tested properly.
  - Rehashed the bochs native timer support which some of the IO devices use.

- ## bochs-981102b

  - Rehashed paging.cc and TLB. Fixed problem with dirty bit not being set after a read operation cached an entry in the TLB. Also, added in legwork for supporting 486+ syle paging behaviour for use with OS's which have copy-on-write strategies.

- ## bochs-981015a

  - cosimulation support for verifying a 2nd CPU simulator (lot's of files touched)
  - moved web pages and ftp to bochs.com
  - developer's email list now hosted by RedHat
  - planning dynamic translation

- ## bochs-980707a

  - added commands to debugger
    - CRC debugger command to checksum regions of memory
    - "info dirty" command, to display pages dirtied since last display
    - "take dma" now takes optional count.
  - rehashed phyical read/write routines for effeciency
  - Winstone'98 success so far:
    - Access 97
    - CorelDRAW! 7
    - Excel 97
    - Lotus 1-2-3 97
    - Word 97
    - PowerPoint 97
    - Quattro Pro 7
    - WordPerfect 7
  - Winstone'98 tests remaining:
    - Netscape Navigator
    - Task Switching 1
    - Task Switching 2

- ## bochs-980629a

  - much in the way of x86 validation; many x86 emulation fixes!
  - you can now pass all .bochsrc options on command line
  - deleted breakpoints can now be reused, in debugger
  - added user-level 486 instructions (set config.h:BX_CPU_HACKED to 4 to use)
  - some minor speed-ups
  - Unix machine can generate complete Win32/MS Visual C++ Makefiles, config files
  - You may now create your own instrumentation library, with --enable-instrumentation="instrument/mydir"
  - Winstone'98 success so far:
    - Access 97
    - CorelDRAW! 7
    - Excel 97
    - Lotus 1-2-3 97
    - Word 97
  - Winstone'98 tests remaining:
    - Netscape Navigator
    - PowerPoint 97
    - Quattro Pro 7
    - WordPerfect 7
    - Task Switching 1
    - Task Switching 2

- ## bochs-980512a

  - added disassembly commands to debugger interface
  - fixed bx_panic() calls when using debugger

- ## bochs-980512a

  - more debugger commands and features
  - co-emulation debugger commands
  - added more instrumentation macros to CPU code
  - added handling of EEh (echo) from keyboard ctrl to keyboard

- ## bochs-980407a

  - added some instrumentation features:
    - added '--enable-instrumentation' to configure
    - added "instrumentation.h" that defines instrumenation macros
    - added macros to some main decode loop and some instructions in cpu/
  - added "win32.txt", updated "gui/win32.cc", added "bochsrc.win32" from David Ross (dross@pobox.com). win32 GUI code now filled out.

- ## bochs-980331a

  - added '--with-nogui' option to configure to run without any GUI. Also provides documentation for the GUI specific functions.
  - recoded the PS2 mouse BIOS and some mouse hardware emulation. Mouse now works on X11. Haven't implemented it for BeOS yet. Double click timing doesn't work yet though.
  - (possibly) fixed the panic during Win'95 install due to keyboard.
  - added private_colormap option to .bochsrc. requests a non-shared colormap from your GUI. Only implemented on X11 so far.
  - added mouse option to .bochsrc. Not implemented yet for any of the GUI specific modules, but it will request that mouse events not be generated by the GUI.
  - changed palette change technique to tell GUI of each individual palette element change. The GUI has a chance now, to tell the VGA code if a redraw of the screen is necessary. Redraw is not necessary if using a private colormap.

- ## bochs-980311d

  - configure works with any permutation of disassembler and debugger
  - fixed endian changes, messed up on 980304a
  - Makefiles now use CC, CXX, CFLAGS, CXXFLAGS
  - added --enable-cpp option to configure for use with that C++ suffix
  - got BeOS code up to speed on the cursor changes.

- ## bochs-980304a

  - changed BIG_ENDIAN & LITTLE_ENDIAN to use BX_ prefix
  - added text mode video block cursor
  - added vi package to Redhat install script

- ## bochs-980303a

  - debugger command "info break" to display breakpoints
  - debugger command "d[elete] xyz" to delete breakpoints
  - patch to gui/x.cc for 24bit displays
  - added instructions and script for installing RedHat 5.0 from CD
  - rehashed CMOS RTC code so Linux works

- ## bochs-980224a

  - added 32bit hardware task switching (only from jump's so far)
  - fixes to floppy emulation
  - created new optional debug interface, similar to GDB
  - rehased disassembler for use in debug environment
  - added hardware scrolling to VGA
  - fixed handling of errorcode returned for paging errors
  - Linux now boots!!!

- ## bochs-980124c

  - BIOS floppy read/write fix. AH was not being set.
  - moved config.h:BX_PROCESSOR_IPS to .bochsrc 'ips' directive. Now you can run the same binary on different speed machines of the same type. Just tune the 'ips' directive.
  - converted vga.bdf font to bitmaps for use with BeOS. The BeOS module no longer uses any BeOS system fonts, but just includes the bitmaps in the source code.
  - included patches for 980118.
  - Changed 'mips' field to 'm_ips'. Hopefully, this will fix compiles for MIPS processor based machines.

- ## bochs-980118a

  - Added toolbar to top of GUI
  - Floppy drive can switch between 1.44M & 1.680M formats
  - Implemented Int15 function 87h in real BIOS
  - bochs BIOS is now 100% clean of any 'C' hacks.

- ## bochs-971216b

  - Several optimizations
  - Added prefetch queue
  - Made all device models into C++ classes
  - Moved state information for each device model into state structure within class for future save/restore of device state.

- ## bochs-971118a

  - Moved all GUI specific files (X11 and BeOS) into gui/ subdir
  - Put in temp fix for exception handling restoring original eSP
  - Began process of removing any knowlege of scancodes from GUI code
  - Added better key handling for BeOS