| Plex86/Bochs VGABios |
| -------------------- |
| |
| The goal of this project is to have a LGPL'd Video Bios in plex86, |
| Bochs and qemu. |
| This VGA Bios is very specific to the emulated VGA card. |
| It is NOT meant to drive a physical vga card. |
| |
| |
| Cirrus SVGA extension |
| --------------------- |
| |
| The Cirrus SVGA extension is designed for the Cirrus emulation in Bochs and |
| qemu. The initial patch for the Cirrus extension has been written by Makoto |
| Suzuki (suzu). |
| |
| |
| Install |
| ------- |
| To compile the VGA Bios you will need : |
| - gcc |
| - bcc |
| - as86 |
| - ld86 |
| |
| Untar the archive, and type make. You should get a "VGABIOS-lgpl-latest.bin" |
| file. Alternatively, you can use the binary file "VGABIOS-lgpl-latest.bin", |
| i have compiled for you. |
| |
| Edit your plex86/bochs conf file, and modify the load-rom command in the |
| VGA BIOS section, to point to the new vgabios image file. |
| |
| |
| Debugging |
| --------- |
| You can get a very basic debugging system: messages printed by the vgabios. |
| You have to register the "unmapped" device driver in plex86 or bochs, and make |
| sure it grabs port 0xfff0. |
| |
| Comment the #undef DEBUG at the beginning of vgabios.c. |
| You can then use the "printf" function in the bios. |
| |
| |
| Testing |
| ------- |
| Look at the "testvga.c" file in the archive. This is a minimal Turbo C 2.0 |
| source file that calls a few int10 functions. Feel free to modify it to suit |
| your needs. |
| |
| |
| Copyright and License |
| --------------------- |
| This program has been written by Christophe Bothamy |
| It is protected by the GNU Lesser Public License, which you should |
| have received a copy of along with this package. |
| |
| |
| Reverse Engineering |
| ------------------- |
| The VGA Bios has been written without reverse-engineering any existing Bios. |
| |
| |
| Acknowledgment |
| -------------- |
| The source code contains code ripped from rombios.c of plex86, written |
| by Kevin Lawton <kevin2001@yahoo.com> |
| |
| The source code contains fonts from fntcol16.zip (c) by Joseph Gil avalable at : |
| ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip |
| These fonts are public domain |
| |
| The source code is based on information taken from : |
| - Kevin Lawton's vga card emulation for bochs/plex86 |
| - Ralf Brown's interrupts list avalaible at |
| http://www.cs.cmu.edu/afs/cs/user/ralf/pub/WWW/files.html |
| - Finn Thogersons' VGADOC4b available at http://home.worldonline.dk/~finth/ |
| - Michael Abrash's Graphics Programming Black Book |
| - Francois Gervais' book "programmation des cartes graphiques cga-ega-vga" |
| edited by sybex |
| - DOSEMU 1.0.1 source code for several tables values and formulas |
| |
| |
| Feedback |
| -------- |
| Please report any bugs, comments, patches for this VGA Bios to info@vruppert.de |
| You can find the latest release at : http://www.nongnu.org/vgabios/ |
| For any information on bochs, visit the website http://bochs.sourceforge.net/ |
| For any information on qemu, visit the website http://fabrice.bellard.free.fr/qemu/ |
| |
| |
| History |
| ------- |
| vgabios-0.6c : Apr 08 2009 |
| - Volker |
| . added DPMS support to cirrus vgabios (patch from Gleb Natapov) |
| . use VBE LFB address from PCI base address if present |
| . added support for a lot more non-standard VBE modes (e.g. widescreen modes) |
| . minor bugfixes |
| |
| vgabios-0.6b : May 30 2008 |
| - Volker |
| . added PCI data structure for the Cirrus VGABIOS images |
| . minor bugfixes in biossums utility, VBE support and makefile |
| |
| vgabios-0.6a : Aug 19 2006 |
| - Volker |
| . added minimal support for the video parameter table (VPT) |
| . Cirrus SVGA now supports the "no clear" bit in Cirrus and VESA mode |
| . Bochs VBE protected mode interface improved |
| . save/restore video state support for Bochs VBE and standard VGA added |
| . generate vbetables.h dynamicly |
| . VBE video memory increased to 8 MB (VBE dispi ID changed to B0C4) |
| . lots of 4bpp VBE fixes (all 4bpp VBE modes now enabled) |
| . VGA compatible setup for VBE modes added |
| |
| vgabios-0.5d : Dec 29 2005 |
| - Volker |
| . Bochs VBE protected mode interface added (based on a patch by malc@pulsesoft.com) |
| . biossums utility now supports VGABIOS sizes up to 64 kBytes |
| . VGA mode 0x11: all color planes must be enabled in this 2-color VGA mode |
| |
| vgabios-0.5c : Jul 07 2005 |
| - Volker |
| . BIOS configuration word usually reports initial mode 80x25 color text |
| . vgabios function 0x0e (write teletype): linefeed (0x0a) only increments the |
| cursor row value |
| |
| vgabios-0.5b : May 24 2005 |
| - Volker |
| . fixed return value for the default case in the VBE section (non-debug mode) |
| . removed unused stuff |
| |
| vgabios-0.5a : Mar 07 2005 |
| - Volker |
| . Cirrus SVGA extension (initial patches from Makoto Suzuki, improvements |
| from Fabrice Bellard) |
| . vgabios image size is now exactly 32k with a checksum |
| . a lot of vgabios and vbe functions rewritten in assembler |
| . dynamicly generated VBE mode info list |
| . write character function for CGA and LINEAR8 modes |
| . read/write graphics pixel for some graphics modes |
| . text scroll feature for some graphics modes |
| . VBE 8-bit DAC support |
| |
| vgabios-0.4c : Nov 06 2003 |
| - Christophe |
| . fix font problem on initial screen of NT4 Loader |
| |
| vgabios-0.4b : Nov 04 2003 |
| - Volker |
| . fix offset of character tables |
| . optimizations of CRT controller accesses |
| . VBE i/o registers changed to 0x01CE/CF |
| (suggestion from Daniel Gimpelevich) |
| . "noclear" flag stored in BIOS area |
| . fix character height returned by get_font_info function |
| |
| vgabios-0.4a : Aug 17 2003 |
| - Volker |
| . VBE mode search rewritten (VBE modes with LFB bit removed) |
| . many bugfixes and optimizations |
| . write character function implemented for graphics modes |
| . support for 15bpp, 16bpp, 24bpp and 32bpp VBE modes added |
| . SVGA mode 0x6A added |
| . VBE modes 0x102, 0x117, 0x118 and 0x142 (Bochs specific) |
| |
| vgabios-0.3b : Nov 23 2002 |
| - Christophe |
| . added lfb-mode numbers (patch from mathis) |
| . updated the Makefile |
| . removed display of copyrights. |
| . changed the Copyright string to "LGPL VGABios developers" |
| - Volker |
| . set the cursor shape depending on the current font height |
| . clear BL before calling int 0x10 function 0x1103 in vgabios_init_func |
| . added some text font functions |
| - Jeroen |
| . Forced to new DISPI (0xb0c1) interface (requires latest bochs vbe code) |
| . Added multibuffering support |
| . Added new DISPI interface for: virt width, height, x offset, y offset |
| . Added LFB modes (to be used with the vbe-lfb patch in bochs) |
| see VBE_HAVE_LFB in vbe.c (currently default enabled) |
| . updated TODO & docs for changes after bochs 1.4 |
| |
| vgabios-0.3a : Mar 10 2002 |
| - Christophe |
| . Fixed bug in function ah=13 |
| - Jeroen |
| . updated vbebios implementation to new api |
| . added vbe_display_api documentation |
| . added 640x400x8, 640x480x8, 800x600x8, 1024x768 |
| (>640x480 needs a special bochs patch atm) |
| . added 320x200x8 vbe support (uses the standard 320x200x8 vga mode to |
| display, this allows for testing & having something on screen as well, |
| at least until bochs host side display is up & running) |
| . adding lfbprof (vbe) testprogram (+some small fixes to it) |
| . merging with vbebios 0.2 |
| |
| vgabios-0.2b : Nov 19 2001 |
| - Christophe |
| . Fixed bug in function ah=13 |
| |
| vgabios-0.2a : Nov 09 2001 |
| - Christophe |
| . Included bugfix from techt@pikeonline.net about grayscale summing |
| . Added the "IBM" string at org 0x1e as Bart Oldeman suggested |
| . Fixed DS and ES that where inverted in the int10 parameters list! |
| . The following have been implemented : |
| - function ax=1a00, ax=1a01, ah=1b |
| - function ax=1130 |
| . Added debug messages for unimplemented/unknown functions |
| Must be compiled with DEBUG defined. The output is trapped |
| by the unknown-ioport driver of plex/bochs (port 0xfff0 is used) |
| |
| vgabios-0.1a : May 8 2001 |
| - Christophe |
| . First release. The work has been focused only on text mode. |
| . The following have been implemented : |
| - inits |
| - int 10 handler |
| - functions ah=00, ah=01, ah=02, ah=03, ah=05, ah=06, ah=07, ah=08 |
| ah=09, ah=0a, ah=0e, ah=0f, ax=1000, ax=1001, ax=1002, ax=1003 |
| ax=1007, ax=1008, ax=1009, ax=1010, ax=1012, ax=1013, ax=1015 |
| ax=1017, ax=1018, ax=1019, ax=101a, ax=101b, ah=12 bl=10, |
| ah=12 bl=30, ah=12 bl=31, ah=12 bl=32, ah=12 bl=33, ah=12 bl=34 |
| ah=13 |
