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1.1 root 1: Plex86/Bochs VGABios
2: --------------------
3:
4: The goal of this project is to have a LGPL'd Video Bios in plex86,
5: Bochs and qemu.
6: This VGA Bios is very specific to the emulated VGA card.
7: It is NOT meant to drive a physical vga card.
8:
9:
10: Cirrus SVGA extension
11: ---------------------
12:
13: The Cirrus SVGA extension is designed for the Cirrus emulation in Bochs and
14: qemu. The initial patch for the Cirrus extension has been written by Makoto
15: Suzuki (suzu).
16:
17:
18: Install
19: -------
20: To compile the VGA Bios you will need :
21: - gcc
22: - bcc
23: - as86
24: - ld86
25:
26: Untar the archive, and type make. You should get a "VGABIOS-lgpl-latest.bin"
27: file. Alternatively, you can use the binary file "VGABIOS-lgpl-latest.bin",
28: i have compiled for you.
29:
30: Edit your plex86/bochs conf file, and modify the load-rom command in the
31: VGA BIOS section, to point to the new vgabios image file.
32:
33:
34: Debugging
35: ---------
36: You can get a very basic debugging system: messages printed by the vgabios.
37: You have to register the "unmapped" device driver in plex86 or bochs, and make
38: sure it grabs port 0xfff0.
39:
40: Comment the #undef DEBUG at the beginning of vgabios.c.
41: You can then use the "printf" function in the bios.
42:
43:
44: Testing
45: -------
46: Look at the "testvga.c" file in the archive. This is a minimal Turbo C 2.0
47: source file that calls a few int10 functions. Feel free to modify it to suit
48: your needs.
49:
50:
51: Copyright and License
52: ---------------------
53: This program has been written by Christophe Bothamy
54: It is protected by the GNU Lesser Public License, which you should
55: have received a copy of along with this package.
56:
57:
58: Reverse Engineering
59: -------------------
60: The VGA Bios has been written without reverse-engineering any existing Bios.
61:
62:
63: Acknowledgment
64: --------------
65: The source code contains code ripped from rombios.c of plex86, written
66: by Kevin Lawton <[email protected]>
67:
68: The source code contains fonts from fntcol16.zip (c) by Joseph Gil avalable at :
69: ftp://ftp.simtel.net/pub/simtelnet/msdos/screen/fntcol16.zip
70: These fonts are public domain
71:
72: The source code is based on information taken from :
73: - Kevin Lawton's vga card emulation for bochs/plex86
74: - Ralf Brown's interrupts list avalaible at
75: http://www.cs.cmu.edu/afs/cs/user/ralf/pub/WWW/files.html
76: - Finn Thogersons' VGADOC4b available at http://home.worldonline.dk/~finth/
77: - Michael Abrash's Graphics Programming Black Book
78: - Francois Gervais' book "programmation des cartes graphiques cga-ega-vga"
79: edited by sybex
80: - DOSEMU 1.0.1 source code for several tables values and formulas
81:
82:
83: Feedback
84: --------
85: Please report any bugs, comments, patches for this VGA Bios to [email protected]
86: You can find the latest release at : http://www.nongnu.org/vgabios/
87: For any information on bochs, visit the website http://bochs.sourceforge.net/
88: For any information on qemu, visit the website http://fabrice.bellard.free.fr/qemu/
89:
90:
91: History
92: -------
93: vgabios-0.6b : May 30 2008
94: - Volker
95: . added PCI data structure for the Cirrus VGABIOS images
96: . minor bugfixes in biossums utility, VBE support and makefile
97:
98: vgabios-0.6a : Aug 19 2006
99: - Volker
100: . added minimal support for the video parameter table (VPT)
101: . Cirrus SVGA now supports the "no clear" bit in Cirrus and VESA mode
102: . Bochs VBE protected mode interface improved
103: . save/restore video state support for Bochs VBE and standard VGA added
104: . generate vbetables.h dynamicly
105: . VBE video memory increased to 8 MB (VBE dispi ID changed to B0C4)
106: . lots of 4bpp VBE fixes (all 4bpp VBE modes now enabled)
107: . VGA compatible setup for VBE modes added
108:
109: vgabios-0.5d : Dec 29 2005
110: - Volker
111: . Bochs VBE protected mode interface added (based on a patch by [email protected])
112: . biossums utility now supports VGABIOS sizes up to 64 kBytes
113: . VGA mode 0x11: all color planes must be enabled in this 2-color VGA mode
114:
115: vgabios-0.5c : Jul 07 2005
116: - Volker
117: . BIOS configuration word usually reports initial mode 80x25 color text
118: . vgabios function 0x0e (write teletype): linefeed (0x0a) only increments the
119: cursor row value
120:
121: vgabios-0.5b : May 24 2005
122: - Volker
123: . fixed return value for the default case in the VBE section (non-debug mode)
124: . removed unused stuff
125:
126: vgabios-0.5a : Mar 07 2005
127: - Volker
128: . Cirrus SVGA extension (initial patches from Makoto Suzuki, improvements
129: from Fabrice Bellard)
130: . vgabios image size is now exactly 32k with a checksum
131: . a lot of vgabios and vbe functions rewritten in assembler
132: . dynamicly generated VBE mode info list
133: . write character function for CGA and LINEAR8 modes
134: . read/write graphics pixel for some graphics modes
135: . text scroll feature for some graphics modes
136: . VBE 8-bit DAC support
137:
138: vgabios-0.4c : Nov 06 2003
139: - Christophe
140: . fix font problem on initial screen of NT4 Loader
141:
142: vgabios-0.4b : Nov 04 2003
143: - Volker
144: . fix offset of character tables
145: . optimizations of CRT controller accesses
146: . VBE i/o registers changed to 0x01CE/CF
147: (suggestion from Daniel Gimpelevich)
148: . "noclear" flag stored in BIOS area
149: . fix character height returned by get_font_info function
150:
151: vgabios-0.4a : Aug 17 2003
152: - Volker
153: . VBE mode search rewritten (VBE modes with LFB bit removed)
154: . many bugfixes and optimizations
155: . write character function implemented for graphics modes
156: . support for 15bpp, 16bpp, 24bpp and 32bpp VBE modes added
157: . SVGA mode 0x6A added
158: . VBE modes 0x102, 0x117, 0x118 and 0x142 (Bochs specific)
159:
160: vgabios-0.3b : Nov 23 2002
161: - Christophe
162: . added lfb-mode numbers (patch from mathis)
163: . updated the Makefile
164: . removed display of copyrights.
165: . changed the Copyright string to "LGPL VGABios developers"
166: - Volker
167: . set the cursor shape depending on the current font height
168: . clear BL before calling int 0x10 function 0x1103 in vgabios_init_func
169: . added some text font functions
170: - Jeroen
171: . Forced to new DISPI (0xb0c1) interface (requires latest bochs vbe code)
172: . Added multibuffering support
173: . Added new DISPI interface for: virt width, height, x offset, y offset
174: . Added LFB modes (to be used with the vbe-lfb patch in bochs)
175: see VBE_HAVE_LFB in vbe.c (currently default enabled)
176: . updated TODO & docs for changes after bochs 1.4
177:
178: vgabios-0.3a : Mar 10 2002
179: - Christophe
180: . Fixed bug in function ah=13
181: - Jeroen
182: . updated vbebios implementation to new api
183: . added vbe_display_api documentation
184: . added 640x400x8, 640x480x8, 800x600x8, 1024x768
185: (>640x480 needs a special bochs patch atm)
186: . added 320x200x8 vbe support (uses the standard 320x200x8 vga mode to
187: display, this allows for testing & having something on screen as well,
188: at least until bochs host side display is up & running)
189: . adding lfbprof (vbe) testprogram (+some small fixes to it)
190: . merging with vbebios 0.2
191:
192: vgabios-0.2b : Nov 19 2001
193: - Christophe
194: . Fixed bug in function ah=13
195:
196: vgabios-0.2a : Nov 09 2001
197: - Christophe
198: . Included bugfix from [email protected] about grayscale summing
199: . Added the "IBM" string at org 0x1e as Bart Oldeman suggested
200: . Fixed DS and ES that where inverted in the int10 parameters list!
201: . The following have been implemented :
202: - function ax=1a00, ax=1a01, ah=1b
203: - function ax=1130
204: . Added debug messages for unimplemented/unknown functions
205: Must be compiled with DEBUG defined. The output is trapped
206: by the unknown-ioport driver of plex/bochs (port 0xfff0 is used)
207:
208: vgabios-0.1a : May 8 2001
209: - Christophe
210: . First release. The work has been focused only on text mode.
211: . The following have been implemented :
212: - inits
213: - int 10 handler
214: - functions ah=00, ah=01, ah=02, ah=03, ah=05, ah=06, ah=07, ah=08
215: ah=09, ah=0a, ah=0e, ah=0f, ax=1000, ax=1001, ax=1002, ax=1003
216: ax=1007, ax=1008, ax=1009, ax=1010, ax=1012, ax=1013, ax=1015
217: ax=1017, ax=1018, ax=1019, ax=101a, ax=101b, ah=12 bl=10,
218: ah=12 bl=30, ah=12 bl=31, ah=12 bl=32, ah=12 bl=33, ah=12 bl=34
219: ah=13
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