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