1 | ;; ============================================================================================
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2 | ;;
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3 | ;; Copyright (C) 2001,2002 the LGPL VGABios developers Team
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4 | ;;
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5 | ;; This library is free software; you can redistribute it and/or
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6 | ;; modify it under the terms of the GNU Lesser General Public
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7 | ;; License as published by the Free Software Foundation; either
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8 | ;; version 2 of the License, or (at your option) any later version.
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9 | ;;
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10 | ;; This library is distributed in the hope that it will be useful,
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11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 | ;; Lesser General Public License for more details.
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14 | ;;
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15 | ;; You should have received a copy of the GNU Lesser General Public
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16 | ;; License along with this library; if not, write to the Free Software
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17 | ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 | ;;
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19 | ;; ============================================================================================
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20 | ;;
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21 | ;; This VGA Bios is specific to the plex86/bochs Emulated VGA card.
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22 | ;; You can NOT drive any physical vga card with it.
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23 | ;;
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24 | ;; ============================================================================================
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25 | ;;
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26 |
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27 |
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28 | ; Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
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29 | ; other than GPL or LGPL is available it will apply instead, Oracle elects to use only
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30 | ; the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
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31 | ; a choice of LGPL license versions is made available with the language indicating
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32 | ; that LGPLv2 or any later version may be used, or where a choice of which version
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33 | ; of the LGPL is applied is otherwise unspecified.
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34 |
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35 | include vgadefs.inc
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36 | include commondefs.inc
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37 |
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38 | public vgabios_int10_handler
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39 |
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40 | VGAROM segment public 'CODE'
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41 |
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42 | ; Implemented in C
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43 | extrn _int10_func:near
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44 | extrn _vgabios_init_func:near
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45 |
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46 | ifdef VBE
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47 | ; Implemented in separate assembly module
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48 | extrn vbe_biosfn_return_current_mode:near
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49 | extrn vbe_biosfn_display_window_control:near
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50 | extrn vbe_biosfn_set_get_logical_scan_line_length:near
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51 | extrn vbe_biosfn_set_get_display_start:near
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52 | extrn vbe_biosfn_set_get_dac_palette_format:near
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53 | extrn vbe_biosfn_set_get_palette_data:near
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54 | extrn vbe_biosfn_return_protected_mode_interface:near
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55 | endif
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56 |
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57 | ifdef VGA_DEBUG
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58 | extrn _int10_debugmsg:near
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59 | extrn _printf:near
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60 | extrn _unimplemented:near
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61 | extrn _unknown:near
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62 | endif
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63 |
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64 | vgabios_start:
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65 |
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66 | db 055h, 0AAh ; ROM signature, required for expansion ROMs
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67 | db 40h ; ROM module length in units of 512 bytes */
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68 |
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69 |
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70 | vgabios_entry_point:
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71 |
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72 | jmp _vgabios_init_func
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73 |
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74 | org 1Eh
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75 |
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76 | db 'IBM',0
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77 |
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78 | ;;
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79 | ;; int10 handled here
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80 | ;;
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81 |
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82 | SET_DEFAULT_CPU_286
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83 |
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84 | vgabios_int10_handler:
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85 | pushf
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86 | ifdef VGA_DEBUG
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87 | push es
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88 | push ds
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89 | DO_pusha
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90 | mov bx, 0C000h
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91 | mov ds, bx
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92 | call _int10_debugmsg
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93 | DO_popa
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94 | pop ds
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95 | pop es
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96 | endif
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97 | cmp ah, 0Fh
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98 | jne int10_test_1A
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99 | call biosfn_get_video_mode
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100 | jmp int10_end
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101 | int10_test_1A:
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102 | cmp ah, 1Ah
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103 | jne int10_test_0B
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104 | call biosfn_group_1A
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105 | jmp int10_end
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106 | int10_test_0B:
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107 | cmp ah, 0Bh
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108 | jne int10_test_1103
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109 | call biosfn_group_0B
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110 | jmp int10_end
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111 | int10_test_1103:
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112 | cmp ax, 1103h
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113 | jne int10_test_12
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114 | call biosfn_set_text_block_specifier
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115 | jmp int10_end
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116 | int10_test_12:
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117 | cmp ah, 12h
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118 | jne int10_test_101B
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119 | cmp bl, 10h
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120 | jne int10_test_BL30
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121 | call biosfn_get_ega_info
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122 | jmp int10_end
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123 | int10_test_BL30:
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124 | cmp bl, 30h
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125 | jne int10_test_BL31
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126 | call biosfn_select_vert_res
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127 | jmp int10_end
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128 | int10_test_BL31:
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129 | cmp bl, 31h
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130 | jne int10_test_BL32
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131 | call biosfn_enable_default_palette_loading
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132 | jmp int10_end
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133 | int10_test_BL32:
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134 | cmp bl, 32h
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135 | jne int10_test_BL33
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136 | call biosfn_enable_video_addressing
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137 | jmp int10_end
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138 | int10_test_BL33:
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139 | cmp bl, 33h
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140 | jne int10_test_BL34
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141 | call biosfn_enable_grayscale_summing
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142 | jmp int10_end
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143 | int10_test_BL34:
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144 | cmp bl, 34h
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145 | jne int10_normal
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146 | call biosfn_enable_cursor_emulation
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147 | jmp int10_end
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148 | int10_test_101B:
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149 | cmp ax, 101Bh
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150 | je int10_normal
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151 | cmp ah, 10h
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152 | ifndef VBE
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153 | jne int10_normal
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154 | else
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155 | jne int10_test_4F
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156 | endif
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157 | call biosfn_group_10
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158 | jmp int10_end
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159 | ifdef VBE
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160 | int10_test_4F:
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161 | cmp ah, 4Fh
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162 | jne int10_normal
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163 | cmp al, 3
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164 | jne int10_test_vbe_05
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165 | call vbe_biosfn_return_current_mode
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166 | jmp int10_end
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167 | int10_test_vbe_05:
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168 | cmp al, 5
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169 | jne int10_test_vbe_06
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170 | call vbe_biosfn_display_window_control
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171 | jmp int10_end
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172 | int10_test_vbe_06:
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173 | cmp al, 6
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174 | jne int10_test_vbe_07
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175 | call vbe_biosfn_set_get_logical_scan_line_length
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176 | jmp int10_end
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177 | int10_test_vbe_07:
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178 | cmp al, 7
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179 | jne int10_test_vbe_08
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180 | call vbe_biosfn_set_get_display_start
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181 | jmp int10_end
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182 | int10_test_vbe_08:
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183 | cmp al, 8
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184 | jne int10_test_vbe_09
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185 | call vbe_biosfn_set_get_dac_palette_format
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186 | jmp int10_end
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187 | int10_test_vbe_09:
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188 | cmp al, 9
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189 | jne int10_test_vbe_0A
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190 | call vbe_biosfn_set_get_palette_data
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191 | jmp int10_end
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192 | int10_test_vbe_0A:
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193 | cmp al, 0Ah
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194 | jne int10_normal
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195 | call vbe_biosfn_return_protected_mode_interface
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196 | jmp int10_end
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197 | endif
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198 |
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199 | int10_normal:
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200 | push es
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201 | push ds
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202 | DO_pusha
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203 |
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204 | ;; We have to set ds to access the right data segment
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205 | mov bx, 0C000h
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206 | mov ds, bx
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207 | call _int10_func
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208 |
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209 | DO_popa
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210 | pop ds
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211 | pop es
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212 | int10_end:
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213 | popf
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214 | iret
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215 |
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216 | ;;--------------------------------------------------------------------------------------------
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217 |
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218 | biosfn_group_0B:
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219 | cmp bh, 0
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220 | je biosfn_set_border_color
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221 | cmp bh, 1
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222 | je biosfn_set_palette
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223 | ifdef VGA_DEBUG
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224 | call _unknown
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225 | endif
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226 | ret
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227 | biosfn_set_border_color:
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228 | push ax
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229 | push bx
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230 | push cx
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231 | push dx
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232 | push ds
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233 | mov dx, BIOSMEM_SEG
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234 | mov ds, dx
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235 | mov dx, VGAREG_ACTL_RESET
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236 | in al, dx
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237 | cmp byte ptr ds:[BIOSMEM_CURRENT_MODE], 3
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238 | jbe set_border_done
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239 | mov dx, VGAREG_ACTL_ADDRESS
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240 | mov al, 00h
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241 | out dx, al
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242 | mov al, bl
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243 | and al, 0Fh
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244 | test al, 08h
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245 | jz set_low_border
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246 | add al, 08h
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247 | set_low_border:
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248 | out dx, al
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249 | mov cl, 1
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250 | and bl, 10h
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251 | set_intensity_loop:
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252 | mov dx, VGAREG_ACTL_ADDRESS
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253 | mov al, cl
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254 | out dx, al
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255 | mov dx, VGAREG_ACTL_READ_DATA
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256 | in al, dx
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257 | and al, 0EFh
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258 | or al, bl
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259 | mov dx, VGAREG_ACTL_ADDRESS
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260 | out dx, al
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261 | inc cl
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262 | cmp cl, 4
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263 | jne set_intensity_loop
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264 | set_border_done:
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265 | mov al, 20h
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266 | out dx, al
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267 | ifdef VBOX
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268 | mov dx, VGAREG_ACTL_RESET
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269 | in al, dx
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270 | endif ; VBOX
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271 | pop ds
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272 | pop dx
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273 | pop cx
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274 | pop bx
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275 | pop ax
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276 | ret
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277 | biosfn_set_palette:
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278 | push ax
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279 | push bx
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280 | push cx
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281 | push dx
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282 | mov dx, VGAREG_ACTL_RESET
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283 | in al, dx
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284 | mov cl, 01
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285 | and bl, 01
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286 | set_cga_palette_loop:
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287 | mov dx, VGAREG_ACTL_ADDRESS
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288 | mov al, cl
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289 | out dx, al
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290 | mov dx, VGAREG_ACTL_READ_DATA
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291 | in al, dx
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292 | and al, 0FEh
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293 | or al, bl
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294 | mov dx, VGAREG_ACTL_ADDRESS
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295 | out dx, al
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296 | inc cl
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297 | cmp cl, 4
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298 | jne set_cga_palette_loop
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299 | mov al, 20h
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300 | out dx, al
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301 | ifdef VBOX
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302 | mov dx, VGAREG_ACTL_RESET
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303 | in al, dx
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304 | endif ; VBOX
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305 | pop dx
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306 | pop cx
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307 | pop bx
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308 | pop ax
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309 | ret
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310 |
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311 | ;;--------------------------------------------------------------------------------------------
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312 |
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313 | biosfn_get_video_mode:
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314 | push ds
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315 | mov ax, BIOSMEM_SEG
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316 | mov ds, ax
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317 | push bx
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318 | mov bx, BIOSMEM_CURRENT_PAGE
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319 | mov al, [bx]
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320 | pop bx
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321 | mov bh, al
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322 | push bx
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323 | mov bx, BIOSMEM_VIDEO_CTL
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324 | mov ah, [bx]
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325 | and ah, 80h
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326 | mov bx, BIOSMEM_CURRENT_MODE
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327 | mov al, [bx]
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328 | or al, ah
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329 | mov bx, BIOSMEM_NB_COLS
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330 | mov ah, [bx]
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331 | pop bx
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332 | pop ds
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333 | ret
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334 |
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335 | ;--------------------------------------------------------------------------------------------
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336 |
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337 | biosfn_group_10:
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338 | cmp al, 0
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339 | jne int10_test_1001
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340 | jmp biosfn_set_single_palette_reg
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341 | int10_test_1001:
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342 | cmp al, 1
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343 | jne int10_test_1002
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344 | jmp biosfn_set_overscan_border_color
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345 | int10_test_1002:
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346 | cmp al, 2
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347 | jne int10_test_1003
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348 | jmp biosfn_set_all_palette_reg
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349 | int10_test_1003:
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350 | cmp al, 3
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351 | jne int10_test_1007
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352 | jmp biosfn_toggle_intensity
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353 | int10_test_1007:
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354 | cmp al, 7
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355 | jne int10_test_1008
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356 | jmp biosfn_get_single_palette_reg
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357 | int10_test_1008:
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358 | cmp al, 8
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359 | jne int10_test_1009
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360 | jmp biosfn_read_overscan_border_color
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361 | int10_test_1009:
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362 | cmp al, 9
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363 | jne int10_test_1010
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364 | jmp biosfn_get_all_palette_reg
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365 | int10_test_1010:
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366 | cmp al, 10h
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367 | jne int10_test_1012
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368 | jmp biosfn_set_single_dac_reg
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369 | int10_test_1012:
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370 | cmp al, 12h
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371 | jne int10_test_1013
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372 | jmp biosfn_set_all_dac_reg
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373 | int10_test_1013:
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374 | cmp al, 13h
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375 | jne int10_test_1015
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376 | jmp biosfn_select_video_dac_color_page
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377 | int10_test_1015:
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378 | cmp al, 15h
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379 | jne int10_test_1017
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380 | jmp biosfn_read_single_dac_reg
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381 | int10_test_1017:
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382 | cmp al, 17h
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383 | jne int10_test_1018
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384 | jmp biosfn_read_all_dac_reg
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385 | int10_test_1018:
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386 | cmp al, 18h
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387 | jne int10_test_1019
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388 | jmp biosfn_set_pel_mask
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389 | int10_test_1019:
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390 | cmp al, 19h
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391 | jne int10_test_101A
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392 | jmp biosfn_read_pel_mask
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393 | int10_test_101A:
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394 | cmp al, 1Ah
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395 | jne int10_group_10_unknown
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396 | jmp biosfn_read_video_dac_state
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397 | int10_group_10_unknown:
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398 | ifdef VGA_DEBUG
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399 | call _unknown
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400 | endif
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401 | ret
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402 |
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403 | biosfn_set_single_palette_reg:
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404 | cmp bl, 14h
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405 | ja no_actl_reg1
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406 | push ax
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407 | push dx
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408 | mov dx, VGAREG_ACTL_RESET
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409 | in al, dx
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410 | mov dx, VGAREG_ACTL_ADDRESS
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411 | mov al, bl
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412 | out dx, al
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413 | mov al, bh
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414 | out dx, al
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415 | mov al, 20h
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416 | out dx, al
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417 | ifdef VBOX
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418 | mov dx, VGAREG_ACTL_RESET
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419 | in al, dx
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420 | endif ; VBOX
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421 | pop dx
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422 | pop ax
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423 | no_actl_reg1:
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424 | ret
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425 |
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426 | ;--------------------------------------------------------------------------------------------
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427 |
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428 | biosfn_set_overscan_border_color:
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429 | push bx
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430 | mov bl, 11h
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431 | call biosfn_set_single_palette_reg
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432 | pop bx
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433 | ret
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434 |
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435 | ;--------------------------------------------------------------------------------------------
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436 |
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437 | biosfn_set_all_palette_reg:
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438 | push ax
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439 | push bx
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440 | push cx
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441 | push dx
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442 | mov bx, dx
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443 | mov dx, VGAREG_ACTL_RESET
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444 | in al, dx
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445 | mov cl, 0
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446 | mov dx, VGAREG_ACTL_ADDRESS
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447 | set_palette_loop:
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448 | mov al, cl
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449 | out dx, al
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450 | mov al, es:[bx]
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451 | out dx, al
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452 | inc bx
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453 | inc cl
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454 | cmp cl, 10h
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455 | jne set_palette_loop
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456 | mov al, 11h
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457 | out dx, al
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458 | mov al, es:[bx]
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459 | out dx, al
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460 | mov al, 20h
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461 | out dx, al
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462 | ifdef VBOX
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463 | mov dx, VGAREG_ACTL_RESET
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464 | in al, dx
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465 | endif ; VBOX
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466 | pop dx
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467 | pop cx
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468 | pop bx
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469 | pop ax
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470 | ret
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471 |
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472 | ;;--------------------------------------------------------------------------------------------
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473 |
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474 | biosfn_toggle_intensity:
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475 | push ax
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476 | push bx
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477 | push dx
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478 | mov dx, VGAREG_ACTL_RESET
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479 | in al, dx
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480 | mov dx, VGAREG_ACTL_ADDRESS
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481 | mov al, 10h
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482 | out dx, al
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483 | mov dx, VGAREG_ACTL_READ_DATA
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484 | in al, dx
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485 | and al, 0F7h
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486 | and bl, 01
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487 | if VBOX_BIOS_CPU gt 8086
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488 | shl bl, 3
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489 | else
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490 | shl bl, 1
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491 | shl bl, 1
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492 | shl bl, 1
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493 | endif
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494 | or al, bl
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495 | mov dx, VGAREG_ACTL_ADDRESS
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496 | out dx, al
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497 | mov al, 20h
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498 | out dx, al
|
---|
499 | ifdef VBOX
|
---|
500 | mov dx, VGAREG_ACTL_RESET
|
---|
501 | in al, dx
|
---|
502 | endif ; VBOX
|
---|
503 | pop dx
|
---|
504 | pop bx
|
---|
505 | pop ax
|
---|
506 | ret
|
---|
507 |
|
---|
508 | ;;--------------------------------------------------------------------------------------------
|
---|
509 |
|
---|
510 | biosfn_get_single_palette_reg:
|
---|
511 | cmp bl, 14h
|
---|
512 | ja no_actl_reg2
|
---|
513 | push ax
|
---|
514 | push dx
|
---|
515 | mov dx, VGAREG_ACTL_RESET
|
---|
516 | in al, dx
|
---|
517 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
518 | mov al, bl
|
---|
519 | out dx, al
|
---|
520 | mov dx, VGAREG_ACTL_READ_DATA
|
---|
521 | in al, dx
|
---|
522 | mov bh, al
|
---|
523 | mov dx, VGAREG_ACTL_RESET
|
---|
524 | in al, dx
|
---|
525 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
526 | mov al, 20h
|
---|
527 | out dx, al
|
---|
528 | ifdef VBOX
|
---|
529 | mov dx, VGAREG_ACTL_RESET
|
---|
530 | in al, dx
|
---|
531 | endif ; VBOX
|
---|
532 | pop dx
|
---|
533 | pop ax
|
---|
534 | no_actl_reg2:
|
---|
535 | ret
|
---|
536 |
|
---|
537 | ;;--------------------------------------------------------------------------------------------
|
---|
538 |
|
---|
539 | biosfn_read_overscan_border_color:
|
---|
540 | push ax
|
---|
541 | push bx
|
---|
542 | mov bl, 11h
|
---|
543 | call biosfn_get_single_palette_reg
|
---|
544 | mov al, bh
|
---|
545 | pop bx
|
---|
546 | mov bh, al
|
---|
547 | pop ax
|
---|
548 | ret
|
---|
549 |
|
---|
550 | ;;--------------------------------------------------------------------------------------------
|
---|
551 |
|
---|
552 | biosfn_get_all_palette_reg:
|
---|
553 | push ax
|
---|
554 | push bx
|
---|
555 | push cx
|
---|
556 | push dx
|
---|
557 | mov bx, dx
|
---|
558 | mov cl, 0
|
---|
559 | get_palette_loop:
|
---|
560 | mov dx, VGAREG_ACTL_RESET
|
---|
561 | in al, dx
|
---|
562 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
563 | mov al, cl
|
---|
564 | out dx, al
|
---|
565 | mov dx, VGAREG_ACTL_READ_DATA
|
---|
566 | in al, dx
|
---|
567 | mov es:[bx], al
|
---|
568 | inc bx
|
---|
569 | inc cl
|
---|
570 | cmp cl, 10h
|
---|
571 | jne get_palette_loop
|
---|
572 | mov dx, VGAREG_ACTL_RESET
|
---|
573 | in al, dx
|
---|
574 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
575 | mov al, 11h
|
---|
576 | out dx, al
|
---|
577 | mov dx, VGAREG_ACTL_READ_DATA
|
---|
578 | in al, dx
|
---|
579 | mov es:[bx], al
|
---|
580 | mov dx, VGAREG_ACTL_RESET
|
---|
581 | in al, dx
|
---|
582 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
583 | mov al, 20h
|
---|
584 | out dx, al
|
---|
585 | ifdef VBOX
|
---|
586 | mov dx, VGAREG_ACTL_RESET
|
---|
587 | in al, dx
|
---|
588 | endif ; VBOX
|
---|
589 | pop dx
|
---|
590 | pop cx
|
---|
591 | pop bx
|
---|
592 | pop ax
|
---|
593 | ret
|
---|
594 |
|
---|
595 | ;;--------------------------------------------------------------------------------------------
|
---|
596 |
|
---|
597 | biosfn_set_single_dac_reg:
|
---|
598 | push ax
|
---|
599 | push dx
|
---|
600 | mov dx, VGAREG_DAC_WRITE_ADDRESS
|
---|
601 | mov al, bl
|
---|
602 | out dx, al
|
---|
603 | mov dx, VGAREG_DAC_DATA
|
---|
604 | pop ax
|
---|
605 | push ax
|
---|
606 | mov al, ah
|
---|
607 | out dx, al
|
---|
608 | mov al, ch
|
---|
609 | out dx, al
|
---|
610 | mov al, cl
|
---|
611 | out dx, al
|
---|
612 | pop dx
|
---|
613 | pop ax
|
---|
614 | ret
|
---|
615 |
|
---|
616 | ;;--------------------------------------------------------------------------------------------
|
---|
617 |
|
---|
618 | biosfn_set_all_dac_reg:
|
---|
619 | push ax
|
---|
620 | push bx
|
---|
621 | push cx
|
---|
622 | push dx
|
---|
623 | mov dx, VGAREG_DAC_WRITE_ADDRESS
|
---|
624 | mov al, bl
|
---|
625 | out dx, al
|
---|
626 | pop dx
|
---|
627 | push dx
|
---|
628 | mov bx, dx
|
---|
629 | mov dx, VGAREG_DAC_DATA
|
---|
630 | set_dac_loop:
|
---|
631 | mov al, es:[bx]
|
---|
632 | out dx, al
|
---|
633 | inc bx
|
---|
634 | mov al, es:[bx]
|
---|
635 | out dx, al
|
---|
636 | inc bx
|
---|
637 | mov al, es:[bx]
|
---|
638 | out dx, al
|
---|
639 | inc bx
|
---|
640 | dec cx
|
---|
641 | jnz set_dac_loop
|
---|
642 | pop dx
|
---|
643 | pop cx
|
---|
644 | pop bx
|
---|
645 | pop ax
|
---|
646 | ret
|
---|
647 |
|
---|
648 | ;;--------------------------------------------------------------------------------------------
|
---|
649 |
|
---|
650 | biosfn_select_video_dac_color_page:
|
---|
651 | push ax
|
---|
652 | push bx
|
---|
653 | push dx
|
---|
654 | mov dx, VGAREG_ACTL_RESET
|
---|
655 | in al, dx
|
---|
656 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
657 | mov al, 10h
|
---|
658 | out dx, al
|
---|
659 | mov dx, VGAREG_ACTL_READ_DATA
|
---|
660 | in al, dx
|
---|
661 | and bl, 01
|
---|
662 | jnz set_dac_page
|
---|
663 | and al, 07Fh
|
---|
664 | if VBOX_BIOS_CPU gt 8086
|
---|
665 | shl bh, 7
|
---|
666 | else
|
---|
667 | shl bh, 1
|
---|
668 | shl bh, 1
|
---|
669 | shl bh, 1
|
---|
670 | shl bh, 1
|
---|
671 | shl bh, 1
|
---|
672 | shl bh, 1
|
---|
673 | shl bh, 1
|
---|
674 | endif
|
---|
675 | or al, bh
|
---|
676 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
677 | out dx, al
|
---|
678 | jmp set_actl_normal
|
---|
679 | set_dac_page:
|
---|
680 | push ax
|
---|
681 | mov dx, VGAREG_ACTL_RESET
|
---|
682 | in al, dx
|
---|
683 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
684 | mov al, 14h
|
---|
685 | out dx, al
|
---|
686 | pop ax
|
---|
687 | and al, 80h
|
---|
688 | jnz set_dac_16_page
|
---|
689 | if VBOX_BIOS_CPU gt 8086
|
---|
690 | shl bh, 2
|
---|
691 | else
|
---|
692 | shl bh, 1
|
---|
693 | shl bh, 1
|
---|
694 | endif
|
---|
695 | set_dac_16_page:
|
---|
696 | and bh, 0Fh
|
---|
697 | mov al, bh
|
---|
698 | out dx, al
|
---|
699 | set_actl_normal:
|
---|
700 | mov al, 20h
|
---|
701 | out dx, al
|
---|
702 | ifdef VBOX
|
---|
703 | mov dx, VGAREG_ACTL_RESET
|
---|
704 | in al, dx
|
---|
705 | endif ; VBOX
|
---|
706 | pop dx
|
---|
707 | pop bx
|
---|
708 | pop ax
|
---|
709 | ret
|
---|
710 |
|
---|
711 | ;;--------------------------------------------------------------------------------------------
|
---|
712 |
|
---|
713 | biosfn_read_single_dac_reg:
|
---|
714 | push ax
|
---|
715 | push dx
|
---|
716 | mov dx, VGAREG_DAC_READ_ADDRESS
|
---|
717 | mov al, bl
|
---|
718 | out dx, al
|
---|
719 | pop ax
|
---|
720 | mov ah, al
|
---|
721 | mov dx, VGAREG_DAC_DATA
|
---|
722 | in al, dx
|
---|
723 | xchg al, ah
|
---|
724 | push ax
|
---|
725 | in al, dx
|
---|
726 | mov ch, al
|
---|
727 | in al, dx
|
---|
728 | mov cl, al
|
---|
729 | pop dx
|
---|
730 | pop ax
|
---|
731 | ret
|
---|
732 |
|
---|
733 | ;;--------------------------------------------------------------------------------------------
|
---|
734 |
|
---|
735 | biosfn_read_all_dac_reg:
|
---|
736 | push ax
|
---|
737 | push bx
|
---|
738 | push cx
|
---|
739 | push dx
|
---|
740 | mov dx, VGAREG_DAC_READ_ADDRESS
|
---|
741 | mov al, bl
|
---|
742 | out dx, al
|
---|
743 | pop dx
|
---|
744 | push dx
|
---|
745 | mov bx, dx
|
---|
746 | mov dx, VGAREG_DAC_DATA
|
---|
747 | read_dac_loop:
|
---|
748 | in al, dx
|
---|
749 | mov es:[bx], al
|
---|
750 | inc bx
|
---|
751 | in al, dx
|
---|
752 | mov es:[bx], al
|
---|
753 | inc bx
|
---|
754 | in al, dx
|
---|
755 | mov es:[bx], al
|
---|
756 | inc bx
|
---|
757 | dec cx
|
---|
758 | jnz read_dac_loop
|
---|
759 | pop dx
|
---|
760 | pop cx
|
---|
761 | pop bx
|
---|
762 | pop ax
|
---|
763 | ret
|
---|
764 |
|
---|
765 | ;;--------------------------------------------------------------------------------------------
|
---|
766 |
|
---|
767 | biosfn_set_pel_mask:
|
---|
768 | push ax
|
---|
769 | push dx
|
---|
770 | mov dx, VGAREG_PEL_MASK
|
---|
771 | mov al, bl
|
---|
772 | out dx, al
|
---|
773 | pop dx
|
---|
774 | pop ax
|
---|
775 | ret
|
---|
776 |
|
---|
777 | ;;--------------------------------------------------------------------------------------------
|
---|
778 |
|
---|
779 | biosfn_read_pel_mask:
|
---|
780 | push ax
|
---|
781 | push dx
|
---|
782 | mov dx, VGAREG_PEL_MASK
|
---|
783 | in al, dx
|
---|
784 | mov bl, al
|
---|
785 | pop dx
|
---|
786 | pop ax
|
---|
787 | ret
|
---|
788 |
|
---|
789 | ;;--------------------------------------------------------------------------------------------
|
---|
790 |
|
---|
791 | biosfn_read_video_dac_state:
|
---|
792 | push ax
|
---|
793 | push dx
|
---|
794 | mov dx, VGAREG_ACTL_RESET
|
---|
795 | in al, dx
|
---|
796 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
797 | mov al, 10h
|
---|
798 | out dx, al
|
---|
799 | mov dx, VGAREG_ACTL_READ_DATA
|
---|
800 | in al, dx
|
---|
801 | mov bl, al
|
---|
802 | if VBOX_BIOS_CPU gt 8086
|
---|
803 | shr bl, 7
|
---|
804 | else
|
---|
805 | shr bl, 1
|
---|
806 | shr bl, 1
|
---|
807 | shr bl, 1
|
---|
808 | shr bl, 1
|
---|
809 | shr bl, 1
|
---|
810 | shr bl, 1
|
---|
811 | shr bl, 1
|
---|
812 | endif
|
---|
813 | mov dx, VGAREG_ACTL_RESET
|
---|
814 | in al, dx
|
---|
815 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
816 | mov al, 14h
|
---|
817 | out dx, al
|
---|
818 | mov dx, VGAREG_ACTL_READ_DATA
|
---|
819 | in al, dx
|
---|
820 | mov bh, al
|
---|
821 | and bh, 0Fh
|
---|
822 | test bl, 01
|
---|
823 | jnz get_dac_16_page
|
---|
824 | if VBOX_BIOS_CPU gt 8086
|
---|
825 | shr bh, 2
|
---|
826 | else
|
---|
827 | shr bh, 1
|
---|
828 | shr bh, 1
|
---|
829 | endif
|
---|
830 | get_dac_16_page:
|
---|
831 | mov dx, VGAREG_ACTL_RESET
|
---|
832 | in al, dx
|
---|
833 | mov dx, VGAREG_ACTL_ADDRESS
|
---|
834 | mov al, 20h
|
---|
835 | out dx, al
|
---|
836 | ifdef VBOX
|
---|
837 | mov dx, VGAREG_ACTL_RESET
|
---|
838 | in al, dx
|
---|
839 | endif ; VBOX
|
---|
840 | pop dx
|
---|
841 | pop ax
|
---|
842 | ret
|
---|
843 |
|
---|
844 | ;;--------------------------------------------------------------------------------------------
|
---|
845 |
|
---|
846 | biosfn_set_text_block_specifier:
|
---|
847 | push ax
|
---|
848 | push dx
|
---|
849 | mov dx, VGAREG_SEQU_ADDRESS
|
---|
850 | mov ah, bl
|
---|
851 | mov al, 03
|
---|
852 | out dx, ax
|
---|
853 | pop dx
|
---|
854 | pop ax
|
---|
855 | ret
|
---|
856 |
|
---|
857 | ;;--------------------------------------------------------------------------------------------
|
---|
858 |
|
---|
859 | biosfn_get_ega_info:
|
---|
860 | push ds
|
---|
861 | push ax
|
---|
862 | mov ax, BIOSMEM_SEG
|
---|
863 | mov ds, ax
|
---|
864 | xor ch, ch
|
---|
865 | mov bx, BIOSMEM_SWITCHES
|
---|
866 | mov cl, [bx]
|
---|
867 | and cl, 0Fh
|
---|
868 | mov bx, BIOSMEM_CRTC_ADDRESS
|
---|
869 | mov ax, [bx]
|
---|
870 | mov bx, 0003h
|
---|
871 | cmp ax, VGAREG_MDA_CRTC_ADDRESS
|
---|
872 | jne mode_ega_color
|
---|
873 | mov bh, 01
|
---|
874 | mode_ega_color:
|
---|
875 | pop ax
|
---|
876 | pop ds
|
---|
877 | ret
|
---|
878 |
|
---|
879 | ;;--------------------------------------------------------------------------------------------
|
---|
880 |
|
---|
881 | biosfn_select_vert_res:
|
---|
882 |
|
---|
883 | ; res : 00 200 lines, 01 350 lines, 02 400 lines
|
---|
884 |
|
---|
885 | push ds
|
---|
886 | push bx
|
---|
887 | push dx
|
---|
888 | mov dl, al
|
---|
889 | mov ax, BIOSMEM_SEG
|
---|
890 | mov ds, ax
|
---|
891 | mov bx, BIOSMEM_MODESET_CTL
|
---|
892 | mov al, [bx]
|
---|
893 | mov bx, BIOSMEM_SWITCHES
|
---|
894 | mov ah, [bx]
|
---|
895 | cmp dl, 1
|
---|
896 | je vert_res_350
|
---|
897 | jb vert_res_200
|
---|
898 | cmp dl, 2
|
---|
899 | je vert_res_400
|
---|
900 | ifdef VGA_DEBUG
|
---|
901 | mov al, dl
|
---|
902 | xor ah, ah
|
---|
903 | push ax
|
---|
904 | mov bx, msg_vert_res
|
---|
905 | push bx
|
---|
906 | call _printf
|
---|
907 | add sp, 4
|
---|
908 | endif
|
---|
909 | jmp set_retcode
|
---|
910 | vert_res_400:
|
---|
911 |
|
---|
912 | ; reset modeset ctl bit 7 and set bit 4
|
---|
913 | ; set switches bit 3-0 to 09
|
---|
914 |
|
---|
915 | and al, 07Fh
|
---|
916 | or al, 010h
|
---|
917 | and ah, 0F0h
|
---|
918 | or ah, 009h
|
---|
919 | jnz set_vert_res
|
---|
920 | vert_res_350:
|
---|
921 |
|
---|
922 | ; reset modeset ctl bit 7 and bit 4
|
---|
923 | ; set switches bit 3-0 to 09
|
---|
924 |
|
---|
925 | and al, 06Fh
|
---|
926 | and ah, 0F0h
|
---|
927 | or ah, 009h
|
---|
928 | jnz set_vert_res
|
---|
929 | vert_res_200:
|
---|
930 |
|
---|
931 | ; set modeset ctl bit 7 and reset bit 4
|
---|
932 | ; set switches bit 3-0 to 08
|
---|
933 |
|
---|
934 | and al, 0EFh
|
---|
935 | or al, 080h
|
---|
936 | and ah, 0F0h
|
---|
937 | or ah, 008h
|
---|
938 | set_vert_res:
|
---|
939 | mov bx, BIOSMEM_MODESET_CTL
|
---|
940 | mov [bx], al
|
---|
941 | mov bx, BIOSMEM_SWITCHES
|
---|
942 | mov [bx], ah
|
---|
943 | set_retcode:
|
---|
944 | mov ax, 1212h
|
---|
945 | pop dx
|
---|
946 | pop bx
|
---|
947 | pop ds
|
---|
948 | ret
|
---|
949 |
|
---|
950 | ifdef VGA_DEBUG
|
---|
951 | msg_vert_res:
|
---|
952 | db "Select vert res (%02x) was discarded", 13, 10, 0
|
---|
953 | endif
|
---|
954 |
|
---|
955 |
|
---|
956 | biosfn_enable_default_palette_loading:
|
---|
957 | push ds
|
---|
958 | push bx
|
---|
959 | push dx
|
---|
960 | mov dl, al
|
---|
961 | and dl, 01
|
---|
962 | if VBOX_BIOS_CPU gt 8086
|
---|
963 | shl dl, 3
|
---|
964 | else
|
---|
965 | shl dl, 1
|
---|
966 | shl dl, 1
|
---|
967 | shl dl, 1
|
---|
968 | endif
|
---|
969 | mov ax, BIOSMEM_SEG
|
---|
970 | mov ds, ax
|
---|
971 | mov bx, BIOSMEM_MODESET_CTL
|
---|
972 | mov al, [bx]
|
---|
973 | and al, 0F7h
|
---|
974 | or al, dl
|
---|
975 | mov [bx], al
|
---|
976 | mov ax, 1212h
|
---|
977 | pop dx
|
---|
978 | pop bx
|
---|
979 | pop ds
|
---|
980 | ret
|
---|
981 |
|
---|
982 |
|
---|
983 | biosfn_enable_video_addressing:
|
---|
984 | push bx
|
---|
985 | push dx
|
---|
986 | mov bl, al
|
---|
987 | and bl, 01
|
---|
988 | xor bl, 01
|
---|
989 | shl bl, 1
|
---|
990 | mov dx, VGAREG_READ_MISC_OUTPUT
|
---|
991 | in al, dx
|
---|
992 | and al, 0FDh
|
---|
993 | or al, bl
|
---|
994 | mov dx, VGAREG_WRITE_MISC_OUTPUT
|
---|
995 | out dx, al
|
---|
996 | mov ax, 1212h
|
---|
997 | pop dx
|
---|
998 | pop bx
|
---|
999 | ret
|
---|
1000 |
|
---|
1001 |
|
---|
1002 | biosfn_enable_grayscale_summing:
|
---|
1003 | push ds
|
---|
1004 | push bx
|
---|
1005 | push dx
|
---|
1006 | mov dl, al
|
---|
1007 | and dl, 01h
|
---|
1008 | xor dl, 01h
|
---|
1009 | shl dl, 1
|
---|
1010 | mov ax, BIOSMEM_SEG
|
---|
1011 | mov ds, ax
|
---|
1012 | mov bx, BIOSMEM_MODESET_CTL
|
---|
1013 | mov al, [bx]
|
---|
1014 | and al, 0FDh
|
---|
1015 | or al, dl
|
---|
1016 | mov [bx], al
|
---|
1017 | mov ax, 1212h
|
---|
1018 | pop dx
|
---|
1019 | pop bx
|
---|
1020 | pop ds
|
---|
1021 | ret
|
---|
1022 |
|
---|
1023 |
|
---|
1024 | biosfn_enable_cursor_emulation:
|
---|
1025 | push ds
|
---|
1026 | push bx
|
---|
1027 | push dx
|
---|
1028 | mov dl, al
|
---|
1029 | and dl, 01
|
---|
1030 | xor dl, 01
|
---|
1031 | mov ax, BIOSMEM_SEG
|
---|
1032 | mov ds, ax
|
---|
1033 | mov bx, BIOSMEM_MODESET_CTL
|
---|
1034 | mov al, [bx]
|
---|
1035 | and al, 0FEh
|
---|
1036 | or al, dl
|
---|
1037 | mov [bx], al
|
---|
1038 | mov ax, 1212h
|
---|
1039 | pop dx
|
---|
1040 | pop bx
|
---|
1041 | pop ds
|
---|
1042 | ret
|
---|
1043 |
|
---|
1044 | ;;--------------------------------------------------------------------------------------------
|
---|
1045 |
|
---|
1046 | biosfn_group_1A:
|
---|
1047 | cmp al, 0
|
---|
1048 | je biosfn_read_display_code
|
---|
1049 | cmp al, 1
|
---|
1050 | je biosfn_set_display_code
|
---|
1051 | ifdef VGA_DEBUG
|
---|
1052 | call _unknown
|
---|
1053 | endif
|
---|
1054 | ret
|
---|
1055 | biosfn_read_display_code:
|
---|
1056 | push ds
|
---|
1057 | push ax
|
---|
1058 | mov ax, BIOSMEM_SEG
|
---|
1059 | mov ds, ax
|
---|
1060 | mov bx, BIOSMEM_DCC_INDEX
|
---|
1061 | mov al, [bx]
|
---|
1062 | mov bl, al
|
---|
1063 | xor bh, bh
|
---|
1064 | pop ax
|
---|
1065 | mov al, ah
|
---|
1066 | pop ds
|
---|
1067 | ret
|
---|
1068 | biosfn_set_display_code:
|
---|
1069 | push ds
|
---|
1070 | push ax
|
---|
1071 | push bx
|
---|
1072 | mov ax, BIOSMEM_SEG
|
---|
1073 | mov ds, ax
|
---|
1074 | mov ax, bx
|
---|
1075 | mov bx, BIOSMEM_DCC_INDEX
|
---|
1076 | mov [bx], al
|
---|
1077 | ifdef VGA_DEBUG
|
---|
1078 | mov al, ah
|
---|
1079 | xor ah, ah
|
---|
1080 | push ax
|
---|
1081 | mov bx, msg_alt_dcc
|
---|
1082 | push bx
|
---|
1083 | call _printf
|
---|
1084 | add sp, 4
|
---|
1085 | endif
|
---|
1086 | pop bx
|
---|
1087 | pop ax
|
---|
1088 | mov al, ah
|
---|
1089 | pop ds
|
---|
1090 | ret
|
---|
1091 |
|
---|
1092 | ifdef VGA_DEBUG
|
---|
1093 | msg_alt_dcc:
|
---|
1094 | db "Alternate Display code (%02x) was discarded", 13, 10, 0
|
---|
1095 | endif
|
---|
1096 |
|
---|
1097 | VGAROM ends
|
---|
1098 |
|
---|
1099 | end
|
---|