vgabios/clext.c

   1 //
   2 //  QEMU Cirrus CLGD 54xx VGABIOS Extension.
   3 //
   4 //  Copyright (c) 2004 Makoto Suzuki (suzu)
   5 //
   6 //  This library is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU Lesser General Public
   8 //  License as published by the Free Software Foundation; either
   9 //  version 2 of the License, or (at your option) any later version.
  10 //
  11 //  This library is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 //  Lesser General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU Lesser General Public
  17 //  License along with this library; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 //
  20
  21 //#define CIRRUS_VESA3_PMINFO
  22 #ifdef VBE
  23 #undef CIRRUS_VESA3_PMINFO
  24 #endif
  25
  26 #define PM_BIOSMEM_CURRENT_MODE 0x449
  27 #define PM_BIOSMEM_CRTC_ADDRESS 0x463
  28 #define PM_BIOSMEM_VBE_MODE 0x4BA
  29
  30 typedef struct
  31 {
  32   /* + 0 */
  33   unsigned short mode;
  34   unsigned short width;
  35   unsigned short height;
  36   unsigned short depth;
  37   /* + 8 */
  38   unsigned short hidden_dac; /* 0x3c6 */
  39   unsigned short *seq; /* 0x3c4 */
  40   unsigned short *graph; /* 0x3ce */
  41   unsigned short *crtc; /* 0x3d4 */
  42   /* +16 */
  43   unsigned char bitsperpixel;
  44   unsigned char vesacolortype;
  45   unsigned char vesaredmask;
  46   unsigned char vesaredpos;
  47   unsigned char vesagreenmask;
  48   unsigned char vesagreenpos;
  49   unsigned char vesabluemask;
  50   unsigned char vesabluepos;
  51   /* +24 */
  52   unsigned char vesareservedmask;
  53   unsigned char vesareservedpos;
  54 } cirrus_mode_t;
  55 #define CIRRUS_MODE_SIZE 26
  56
  57
  58 /* For VESA BIOS 3.0 */
  59 #define CIRRUS_PM16INFO_SIZE 20
  60
  61 /* VGA */
  62 unsigned short cseq_vga[] = {0x0007,0xffff};
  63 unsigned short cgraph_vga[] = {0x0009,0x000a,0x000b,0xffff};
  64 unsigned short ccrtc_vga[] = {0x001a,0x001b,0x001d,0xffff};
  65
  66 /* extensions */
  67 unsigned short cgraph_svgacolor[] = {
  68 0x0000,0x0001,0x0002,0x0003,0x0004,0x4005,0x0506,0x0f07,0xff08,
  69 0x0009,0x000a,0x000b,
  70 0xffff
  71 };
  72 /* 640x480x8 */
  73 unsigned short cseq_640x480x8[] = {
  74 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
  75 0x580b,0x580c,0x580d,0x580e,
  76 0x0412,0x0013,0x2017,
  77 0x331b,0x331c,0x331d,0x331e,
  78 0xffff
  79 };
  80 unsigned short ccrtc_640x480x8[] = {
  81 0x2c11,
  82 0x5f00,0x4f01,0x4f02,0x8003,0x5204,0x1e05,0x0b06,0x3e07,
  83 0x4009,0x000c,0x000d,
  84 0xea10,0xdf12,0x5013,0x4014,0xdf15,0x0b16,0xc317,0xff18,
  85 0x001a,0x221b,0x001d,
  86 0xffff
  87 };
  88 /* 640x480x16 */
  89 unsigned short cseq_640x480x16[] = {
  90 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
  91 0x580b,0x580c,0x580d,0x580e,
  92 0x0412,0x0013,0x2017,
  93 0x331b,0x331c,0x331d,0x331e,
  94 0xffff
  95 };
  96 unsigned short ccrtc_640x480x16[] = {
  97 0x2c11,
  98 0x5f00,0x4f01,0x4f02,0x8003,0x5204,0x1e05,0x0b06,0x3e07,
  99 0x4009,0x000c,0x000d,
 100 0xea10,0xdf12,0xa013,0x4014,0xdf15,0x0b16,0xc317,0xff18,
 101 0x001a,0x221b,0x001d,
 102 0xffff
 103 };
 104 /* 640x480x24 */
 105 unsigned short cseq_640x480x24[] = {
 106 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1507,
 107 0x580b,0x580c,0x580d,0x580e,
 108 0x0412,0x0013,0x2017,
 109 0x331b,0x331c,0x331d,0x331e,
 110 0xffff
 111 };
 112 unsigned short ccrtc_640x480x24[] = {
 113 0x2c11,
 114 0x5f00,0x4f01,0x4f02,0x8003,0x5204,0x1e05,0x0b06,0x3e07,
 115 0x4009,0x000c,0x000d,
 116 0xea10,0xdf12,0x0013,0x4014,0xdf15,0x0b16,0xc317,0xff18,
 117 0x001a,0x321b,0x001d,
 118 0xffff
 119 };
 120 /* 800x600x8 */
 121 unsigned short cseq_800x600x8[] = {
 122 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 123 0x230b,0x230c,0x230d,0x230e,
 124 0x0412,0x0013,0x2017,
 125 0x141b,0x141c,0x141d,0x141e,
 126 0xffff
 127 };
 128 unsigned short ccrtc_800x600x8[] = {
 129 0x2311,0x7d00,0x6301,0x6302,0x8003,0x6b04,0x1a05,0x9806,0xf007,
 130 0x6009,0x000c,0x000d,
 131 0x7d10,0x5712,0x6413,0x4014,0x5715,0x9816,0xc317,0xff18,
 132 0x001a,0x221b,0x001d,
 133 0xffff
 134 };
 135 /* 800x600x16 */
 136 unsigned short cseq_800x600x16[] = {
 137 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
 138 0x230b,0x230c,0x230d,0x230e,
 139 0x0412,0x0013,0x2017,
 140 0x141b,0x141c,0x141d,0x141e,
 141 0xffff
 142 };
 143 unsigned short ccrtc_800x600x16[] = {
 144 0x2311,0x7d00,0x6301,0x6302,0x8003,0x6b04,0x1a05,0x9806,0xf007,
 145 0x6009,0x000c,0x000d,
 146 0x7d10,0x5712,0xc813,0x4014,0x5715,0x9816,0xc317,0xff18,
 147 0x001a,0x221b,0x001d,
 148 0xffff
 149 };
 150 /* 800x600x24 */
 151 unsigned short cseq_800x600x24[] = {
 152 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1507,
 153 0x230b,0x230c,0x230d,0x230e,
 154 0x0412,0x0013,0x2017,
 155 0x141b,0x141c,0x141d,0x141e,
 156 0xffff
 157 };
 158 unsigned short ccrtc_800x600x24[] = {
 159 0x2311,0x7d00,0x6301,0x6302,0x8003,0x6b04,0x1a05,0x9806,0xf007,
 160 0x6009,0x000c,0x000d,
 161 0x7d10,0x5712,0x2c13,0x4014,0x5715,0x9816,0xc317,0xff18,
 162 0x001a,0x321b,0x001d,
 163 0xffff
 164 };
 165 /* 1024x768x8 */
 166 unsigned short cseq_1024x768x8[] = {
 167 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 168 0x760b,0x760c,0x760d,0x760e,
 169 0x0412,0x0013,0x2017,
 170 0x341b,0x341c,0x341d,0x341e,
 171 0xffff
 172 };
 173 unsigned short ccrtc_1024x768x8[] = {
 174 0x2911,0xa300,0x7f01,0x7f02,0x8603,0x8304,0x9405,0x2406,0xf507,
 175 0x6009,0x000c,0x000d,
 176 0x0310,0xff12,0x8013,0x4014,0xff15,0x2416,0xc317,0xff18,
 177 0x001a,0x221b,0x001d,
 178 0xffff
 179 };
 180 /* 1024x768x16 */
 181 unsigned short cseq_1024x768x16[] = {
 182 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
 183 0x760b,0x760c,0x760d,0x760e,
 184 0x0412,0x0013,0x2017,
 185 0x341b,0x341c,0x341d,0x341e,
 186 0xffff
 187 };
 188 unsigned short ccrtc_1024x768x16[] = {
 189 0x2911,0xa300,0x7f01,0x7f02,0x8603,0x8304,0x9405,0x2406,0xf507,
 190 0x6009,0x000c,0x000d,
 191 0x0310,0xff12,0x0013,0x4014,0xff15,0x2416,0xc317,0xff18,
 192 0x001a,0x321b,0x001d,
 193 0xffff
 194 };
 195 /* 1024x768x24 */
 196 unsigned short cseq_1024x768x24[] = {
 197 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1507,
 198 0x760b,0x760c,0x760d,0x760e,
 199 0x0412,0x0013,0x2017,
 200 0x341b,0x341c,0x341d,0x341e,
 201 0xffff
 202 };
 203 unsigned short ccrtc_1024x768x24[] = {
 204 0x2911,0xa300,0x7f01,0x7f02,0x8603,0x8304,0x9405,0x2406,0xf507,
 205 0x6009,0x000c,0x000d,
 206 0x0310,0xff12,0x8013,0x4014,0xff15,0x2416,0xc317,0xff18,
 207 0x001a,0x321b,0x001d,
 208 0xffff
 209 };
 210 /* 1280x1024x8 */
 211 unsigned short cseq_1280x1024x8[] = {
 212 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 213 0x760b,0x760c,0x760d,0x760e,
 214 0x0412,0x0013,0x2017,
 215 0x341b,0x341c,0x341d,0x341e,
 216 0xffff
 217 };
 218 unsigned short ccrtc_1280x1024x8[] = {
 219 0x2911,0xc300,0x9f01,0x9f02,0x8603,0x8304,0x9405,0x2406,0xf707,
 220 0x6009,0x000c,0x000d,
 221 0x0310,0xff12,0xa013,0x4014,0xff15,0x2416,0xc317,0xff18,
 222 0x001a,0x221b,0x001d,
 223 0xffff
 224 };
 225 /* 1280x1024x16 */
 226 unsigned short cseq_1280x1024x16[] = {
 227 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
 228 0x760b,0x760c,0x760d,0x760e,
 229 0x0412,0x0013,0x2017,
 230 0x341b,0x341c,0x341d,0x341e,
 231 0xffff
 232 };
 233 unsigned short ccrtc_1280x1024x16[] = {
 234 0x2911,0xc300,0x9f01,0x9f02,0x8603,0x8304,0x9405,0x2406,0xf707,
 235 0x6009,0x000c,0x000d,
 236 0x0310,0xff12,0x4013,0x4014,0xff15,0x2416,0xc317,0xff18,
 237 0x001a,0x321b,0x001d,
 238 0xffff
 239 };
 240
 241 /* 1600x1200x8 */
 242 unsigned short cseq_1600x1200x8[] = {
 243 0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 244 0x760b,0x760c,0x760d,0x760e,
 245 0x0412,0x0013,0x2017,
 246 0x341b,0x341c,0x341d,0x341e,
 247 0xffff
 248 };
 249 unsigned short ccrtc_1600x1200x8[] = {
 250 0x2911,0xc300,0x9f01,0x9f02,0x8603,0x8304,0x9405,0x2406,0xf707,
 251 0x6009,0x000c,0x000d,
 252 0x0310,0xff12,0xa013,0x4014,0xff15,0x2416,0xc317,0xff18,
 253 0x001a,0x221b,0x001d,
 254 0xffff
 255 };
 256
 257 cirrus_mode_t cirrus_modes[] =
 258 {
 259  {0x5f,640,480,8,0x00,
 260    cseq_640x480x8,cgraph_svgacolor,ccrtc_640x480x8,8,
 261    4,0,0,0,0,0,0,0,0},
 262  {0x64,640,480,16,0xe1,
 263    cseq_640x480x16,cgraph_svgacolor,ccrtc_640x480x16,16,
 264    6,5,11,6,5,5,0,0,0},
 265  {0x66,640,480,15,0xf0,
 266    cseq_640x480x16,cgraph_svgacolor,ccrtc_640x480x16,16,
 267    6,5,10,5,5,5,0,1,15},
 268  {0x71,640,480,24,0xe5,
 269    cseq_640x480x24,cgraph_svgacolor,ccrtc_640x480x24,24,
 270    6,8,16,8,8,8,0,0,0},
 271
 272  {0x5c,800,600,8,0x00,
 273    cseq_800x600x8,cgraph_svgacolor,ccrtc_800x600x8,8,
 274    4,0,0,0,0,0,0,0,0},
 275  {0x65,800,600,16,0xe1,
 276    cseq_800x600x16,cgraph_svgacolor,ccrtc_800x600x16,16,
 277    6,5,11,6,5,5,0,0,0},
 278  {0x67,800,600,15,0xf0,
 279    cseq_800x600x16,cgraph_svgacolor,ccrtc_800x600x16,16,
 280    6,5,10,5,5,5,0,1,15},
 281
 282  {0x60,1024,768,8,0x00,
 283    cseq_1024x768x8,cgraph_svgacolor,ccrtc_1024x768x8,8,
 284    4,0,0,0,0,0,0,0,0},
 285  {0x74,1024,768,16,0xe1,
 286    cseq_1024x768x16,cgraph_svgacolor,ccrtc_1024x768x16,16,
 287    6,5,11,6,5,5,0,0,0},
 288  {0x68,1024,768,15,0xf0,
 289    cseq_1024x768x16,cgraph_svgacolor,ccrtc_1024x768x16,16,
 290    6,5,10,5,5,5,0,1,15},
 291
 292  {0x78,800,600,24,0xe5,
 293    cseq_800x600x24,cgraph_svgacolor,ccrtc_800x600x24,24,
 294    6,8,16,8,8,8,0,0,0},
 295  {0x79,1024,768,24,0xe5,
 296    cseq_1024x768x24,cgraph_svgacolor,ccrtc_1024x768x24,24,
 297    6,8,16,8,8,8,0,0,0},
 298
 299  {0x6d,1280,1024,8,0x00,
 300    cseq_1280x1024x8,cgraph_svgacolor,ccrtc_1280x1024x8,8,
 301    4,0,0,0,0,0,0,0,0},
 302  {0x69,1280,1024,15,0xf0,
 303    cseq_1280x1024x16,cgraph_svgacolor,ccrtc_1280x1024x16,16,
 304    6,5,10,5,5,5,0,1,15},
 305  {0x75,1280,1024,16,0xe1,
 306    cseq_1280x1024x16,cgraph_svgacolor,ccrtc_1280x1024x16,16,
 307    6,5,11,6,5,5,0,0,0},
 308
 309  {0x7b,1600,1200,8,0x00,
 310    cseq_1600x1200x8,cgraph_svgacolor,ccrtc_1600x1200x8,8,
 311    4,0,0,0,0,0,0,0,0},
 312
 313  {0xfe,0,0,0,0,cseq_vga,cgraph_vga,ccrtc_vga,0,
 314    0xff,0,0,0,0,0,0,0,0},
 315  {0xff,0,0,0,0,0,0,0,0,
 316    0xff,0,0,0,0,0,0,0,0},
 317 };
 318
 319 unsigned char cirrus_id_table[] = {
 320   // 5430
 321   0xA0, 0x32,
 322   // 5446
 323   0xB8, 0x39,
 324
 325   0xff, 0xff
 326 };
 327
 328
 329 unsigned short cirrus_vesa_modelist[] = {
 330 // 640x480x8
 331   0x101, 0x5f,
 332 // 640x480x15
 333   0x110, 0x66,
 334 // 640x480x16
 335   0x111, 0x64,
 336 // 640x480x24
 337   0x112, 0x71,
 338 // 800x600x8
 339   0x103, 0x5c,
 340 // 800x600x15
 341   0x113, 0x67,
 342 // 800x600x16
 343   0x114, 0x65,
 344 // 800x600x24
 345   0x115, 0x78,
 346 // 1024x768x8
 347   0x105, 0x60,
 348 // 1024x768x15
 349   0x116, 0x68,
 350 // 1024x768x16
 351   0x117, 0x74,
 352 // 1024x768x24
 353   0x118, 0x79,
 354 // 1280x1024x8
 355   0x107, 0x6d,
 356 // 1280x1024x15
 357   0x119, 0x69,
 358 // 1280x1024x16
 359   0x11a, 0x75,
 360 // invalid
 361   0xffff,0xffff
 362 };
 363
 364
 365 ASM_START
 366
 367 cirrus_installed:
 368 .ascii "cirrus-compatible VGA is detected"
 369 .byte 0x0d,0x0a
 370 .byte 0x0d,0x0a,0x00
 371
 372 cirrus_not_installed:
 373 .ascii "cirrus-compatible VGA is not detected"
 374 .byte 0x0d,0x0a
 375 .byte 0x0d,0x0a,0x00
 376
 377 cirrus_vesa_vendorname:
 378 cirrus_vesa_productname:
 379 cirrus_vesa_oemname:
 380 .ascii "VGABIOS Cirrus extension"
 381 .byte 0
 382 cirrus_vesa_productrevision:
 383 .ascii "1.0"
 384 .byte 0
 385
 386 cirrus_init:
 387   call cirrus_check
 388   jnz no_cirrus
 389   SET_INT_VECTOR(0x10, #0xC000, #cirrus_int10_handler)
 390   mov al, #0x0f ; memory setup
 391   mov dx, #0x3C4
 392   out dx, al
 393   inc dx
 394   in  al, dx
 395   and al, #0x18
 396   mov ah, al
 397   mov al, #0x0a
 398   dec dx
 399   out dx, ax
 400   mov ax, #0x0007 ; set vga mode
 401   out dx, ax
 402   mov ax, #0x0431 ; reset bitblt
 403   mov dx, #0x3CE
 404   out dx, ax
 405   mov ax, #0x0031
 406   out dx, ax
 407 no_cirrus:
 408   ret
 409
 410 cirrus_display_info:
 411   push ds
 412   push si
 413   push cs
 414   pop ds
 415   call cirrus_check
 416   mov si, #cirrus_not_installed
 417   jnz cirrus_msgnotinstalled
 418   mov si, #cirrus_installed
 419
 420 cirrus_msgnotinstalled:
 421   call _display_string
 422   pop si
 423   pop ds
 424   ret
 425
 426 cirrus_check:
 427   push ax
 428   push dx
 429   mov ax, #0x9206
 430   mov dx, #0x3C4
 431   out dx, ax
 432   inc dx
 433   in al, dx
 434   cmp al, #0x12
 435   pop dx
 436   pop ax
 437   ret
 438
 439
 440 cirrus_int10_handler:
 441   pushf
 442   push bp
 443   cmp ah, #0x00  ;; set video mode
 444   jz cirrus_set_video_mode
 445   cmp ah, #0x12  ;; cirrus extension
 446   jz cirrus_extbios
 447   cmp ah, #0x4F  ;; VESA extension
 448   jz cirrus_vesa
 449
 450 cirrus_unhandled:
 451   pop bp
 452   popf
 453   jmp vgabios_int10_handler
 454
 455 cirrus_return:
 456 #ifdef CIRRUS_DEBUG
 457   call cirrus_debug_dump
 458 #endif
 459   pop bp
 460   popf
 461   iret
 462
 463 cirrus_set_video_mode:
 464 #ifdef CIRRUS_DEBUG
 465   call cirrus_debug_dump
 466 #endif
 467   push si
 468   push ax
 469   push bx
 470   push ds
 471 #ifdef CIRRUS_VESA3_PMINFO
 472  db 0x2e ;; cs:
 473   mov si, [cirrus_vesa_sel0000_data]
 474 #else
 475   xor si, si
 476 #endif
 477   mov ds, si
 478   xor bx, bx
 479   mov [PM_BIOSMEM_VBE_MODE], bx
 480   pop ds
 481   pop bx
 482   call cirrus_get_modeentry
 483   jnc cirrus_set_video_mode_extended
 484   mov al, #0xfe
 485   call cirrus_get_modeentry_nomask
 486   call cirrus_switch_mode
 487   pop ax
 488   pop si
 489   jmp cirrus_unhandled
 490
 491 cirrus_extbios:
 492 #ifdef CIRRUS_DEBUG
 493   call cirrus_debug_dump
 494 #endif
 495   cmp bl, #0x80
 496   jb cirrus_unhandled
 497   cmp bl, #0xAF
 498   ja cirrus_unhandled
 499   push bx
 500   and bx, #0x7F
 501   shl bx, 1
 502  db 0x2e ;; cs:
 503   mov bp, cirrus_extbios_handlers[bx]
 504   pop bx
 505   push #cirrus_return
 506   push bp
 507   ret
 508
 509 cirrus_vesa:
 510 #ifdef CIRRUS_DEBUG
 511   call cirrus_debug_dump
 512 #endif
 513   cmp al, #0x10
 514   ja cirrus_vesa_not_handled
 515   push bx
 516   xor bx, bx
 517   mov bl, al
 518   shl bx, 1
 519  db 0x2e ;; cs:
 520   mov bp, cirrus_vesa_handlers[bx]
 521   pop bx
 522   push #cirrus_return
 523   push bp
 524   ret
 525
 526 cirrus_vesa_not_handled:
 527   mov ax, #0x014F ;; not implemented
 528   jmp cirrus_return
 529
 530 #ifdef CIRRUS_DEBUG
 531 cirrus_debug_dump:
 532   push es
 533   push ds
 534   pusha
 535   push cs
 536   pop ds
 537   call _cirrus_debugmsg
 538   popa
 539   pop ds
 540   pop es
 541   ret
 542 #endif
 543
 544 cirrus_set_video_mode_extended:
 545   call cirrus_switch_mode
 546   pop ax ;; mode
 547   test al, #0x80
 548   jnz cirrus_set_video_mode_extended_1
 549   push ax
 550   mov ax, #0xffff ; set to 0xff to keep win 2K happy
 551   call cirrus_clear_vram
 552   pop ax
 553 cirrus_set_video_mode_extended_1:
 554   and al, #0x7f
 555
 556   push ds
 557 #ifdef CIRRUS_VESA3_PMINFO
 558  db 0x2e ;; cs:
 559   mov si, [cirrus_vesa_sel0000_data]
 560 #else
 561   xor si, si
 562 #endif
 563   mov ds, si
 564   mov [PM_BIOSMEM_CURRENT_MODE], al
 565   pop ds
 566
 567   mov al, #0x20
 568
 569   pop si
 570   jmp cirrus_return
 571
 572 cirrus_vesa_pmbios_init:
 573   retf
 574 cirrus_vesa_pmbios_entry:
 575   pushf
 576   push bp
 577   cmp ah, #0x4F
 578   jnz cirrus_vesa_pmbios_unimplemented
 579   cmp al, #0x0F
 580   ja cirrus_vesa_pmbios_unimplemented
 581   push bx
 582   xor bx, bx
 583   mov bl, al
 584   shl bx, 1
 585  db 0x2e ;; cs:
 586   mov bp, cirrus_vesa_handlers[bx]
 587   pop bx
 588   push #cirrus_vesa_pmbios_return
 589   push bp
 590   ret
 591 cirrus_vesa_pmbios_unimplemented:
 592   mov ax, #0x014F
 593 cirrus_vesa_pmbios_return:
 594   pop bp
 595   popf
 596   retf
 597
 598 ; in si:mode table
 599 cirrus_switch_mode:
 600   push ds
 601   push bx
 602   push dx
 603   push cs
 604   pop ds
 605
 606   mov bx, [si+10] ;; seq
 607   mov dx, #0x3c4
 608   mov ax, #0x1206
 609   out dx, ax ;; Unlock cirrus special
 610   call cirrus_switch_mode_setregs
 611
 612   mov bx, [si+12] ;; graph
 613   mov dx, #0x3ce
 614   call cirrus_switch_mode_setregs
 615
 616   mov bx, [si+14] ;; crtc
 617   call cirrus_get_crtc
 618   call cirrus_switch_mode_setregs
 619
 620   mov dx, #0x3c6
 621   mov al, #0x00
 622   out dx, al
 623   in al, dx
 624   in al, dx
 625   in al, dx
 626   in al, dx
 627   mov al, [si+8]  ;; hidden dac
 628   out dx, al
 629   mov al, #0xff
 630   out dx, al
 631
 632   mov al, #0x00
 633   mov bl, [si+17]  ;; memory model
 634   or  bl, bl
 635   jz is_text_mode
 636   mov al, #0x01
 637   cmp bl, #0x03
 638   jnz is_text_mode
 639   or al, #0x40
 640 is_text_mode:
 641   mov bl, #0x10
 642   call biosfn_get_single_palette_reg
 643   and bh, #0xfe
 644   or bh, al
 645   call biosfn_set_single_palette_reg
 646
 647   pop dx
 648   pop bx
 649   pop ds
 650   ret
 651
 652 cirrus_enable_16k_granularity:
 653   push ax
 654   push dx
 655   mov dx, #0x3ce
 656   mov al, #0x0b
 657   out dx, al
 658   inc dx
 659   in al, dx
 660   or al, #0x20 ;; enable 16k
 661   out dx, al
 662   pop dx
 663   pop ax
 664   ret
 665
 666 cirrus_switch_mode_setregs:
 667 csms_1:
 668   mov ax, [bx]
 669   cmp ax, #0xffff
 670   jz csms_2
 671   out dx, ax
 672   add bx, #0x2
 673   jmp csms_1
 674 csms_2:
 675   ret
 676
 677 cirrus_extbios_80h:
 678   push dx
 679   call cirrus_get_crtc
 680   mov al, #0x27
 681   out dx, al
 682   inc dx
 683   in al, dx
 684   mov bx, #_cirrus_id_table
 685 c80h_1:
 686  db 0x2e ;; cs:
 687   mov ah, [bx]
 688   cmp ah, al
 689   jz c80h_2
 690   cmp ah, #0xff
 691   jz c80h_2
 692   inc bx
 693   inc bx
 694   jmp c80h_1
 695 c80h_2:
 696  db 0x2e ;; cs:
 697   mov al, 0x1[bx]
 698   pop dx
 699   mov ah, #0x00
 700   xor bx, bx
 701   ret
 702
 703 cirrus_extbios_81h:
 704   mov ax, #0x100 ;; XXX
 705   ret
 706 cirrus_extbios_82h:
 707   push dx
 708   call cirrus_get_crtc
 709   xor ax, ax
 710   mov al, #0x27
 711   out dx, al
 712   inc dx
 713   in al, dx
 714   and al, #0x03
 715   mov ah, #0xAF
 716   pop dx
 717   ret
 718
 719 cirrus_extbios_85h:
 720   push cx
 721   push dx
 722   mov dx, #0x3C4
 723   mov al, #0x0f ;; get DRAM band width
 724   out dx, al
 725   inc dx
 726   in al, dx
 727   ;; al = 4 << bandwidth
 728   mov cl, al
 729   shr cl, #0x03
 730   and cl, #0x03
 731   cmp cl, #0x03
 732   je c85h2
 733   mov al, #0x04
 734   shl al, cl
 735   jmp c85h3
 736 c85h2:
 737 ;; 4MB or 2MB
 738   and al, #0x80
 739   mov al, #0x20 ;; 2 MB
 740   je c85h3
 741   mov al, #0x40 ;; 4 MB
 742 c85h3:
 743   pop dx
 744   pop cx
 745   ret
 746
 747 cirrus_extbios_9Ah:
 748   mov ax, #0x4060
 749   mov cx, #0x1132
 750   ret
 751
 752 cirrus_extbios_A0h:
 753   call cirrus_get_modeentry
 754   mov ah, #0x01
 755   sbb ah, #0x00
 756   mov bx, cirrus_extbios_A0h_callback
 757   mov si, #0xffff
 758   mov di, bx
 759   mov ds, bx
 760   mov es, bx
 761   ret
 762
 763 cirrus_extbios_A0h_callback:
 764   ;; fatal: not implemented yet
 765   cli
 766   hlt
 767   retf
 768
 769 cirrus_extbios_A1h:
 770   mov bx, #0x0E00 ;; IBM 8512/8513, color
 771   ret
 772
 773 cirrus_extbios_A2h:
 774   mov al, #0x07   ;; HSync 31.5 - 64.0 kHz
 775   ret
 776
 777 cirrus_extbios_AEh:
 778   mov al, #0x01   ;; High Refresh 75Hz
 779   ret
 780
 781 cirrus_extbios_unimplemented:
 782   ret
 783
 784 cirrus_vesa_00h:
 785   push ds
 786   push si
 787   mov bp, di
 788   push es
 789   pop ds
 790   cld
 791   mov ax, [di]
 792   cmp ax, #0x4256 ;; VB
 793   jnz cv00_1
 794   mov ax, [di+2]
 795   cmp ax, #0x3245 ;; E2
 796   jnz cv00_1
 797   ;; VBE2
 798   lea di, 0x14[bp]
 799   mov ax, #0x0100 ;; soft ver.
 800   stosw
 801   mov ax, # cirrus_vesa_vendorname
 802   stosw
 803   mov ax, cs
 804   stosw
 805   mov ax, # cirrus_vesa_productname
 806   stosw
 807   mov ax, cs
 808   stosw
 809   mov ax, # cirrus_vesa_productrevision
 810   stosw
 811   mov ax, cs
 812   stosw
 813 cv00_1:
 814   mov di, bp
 815   mov ax, #0x4556 ;; VE
 816   stosw
 817   mov ax, #0x4153 ;; SA
 818   stosw
 819   mov ax, #0x0200 ;; v2.00
 820   stosw
 821   mov ax, # cirrus_vesa_oemname
 822   stosw
 823   mov ax, cs
 824   stosw
 825   xor ax, ax ;; caps
 826   stosw
 827   stosw
 828   lea ax, 0x40[bp]
 829   stosw
 830   mov ax, es
 831   stosw
 832   call cirrus_extbios_85h ;; vram in 64k
 833   mov ah, #0x00
 834   stosw
 835
 836   push cs
 837   pop ds
 838   lea di, 0x40[bp]
 839   mov si, #_cirrus_vesa_modelist
 840 cv00_2:
 841   lodsw
 842   stosw
 843   add si, #2
 844   cmp ax, #0xffff
 845   jnz cv00_2
 846
 847   mov ax, #0x004F
 848   mov di, bp
 849   pop si
 850   pop ds
 851   ret
 852
 853 cirrus_vesa_01h:
 854   mov ax, cx
 855   and ax, #0x3fff
 856   call cirrus_vesamode_to_mode
 857   cmp ax, #0xffff
 858   jnz cirrus_vesa_01h_1
 859   jmp cirrus_vesa_unimplemented
 860 cirrus_vesa_01h_1:
 861   push ds
 862   push si
 863   push cx
 864   push dx
 865   push bx
 866   mov bp, di
 867   cld
 868   push cs
 869   pop ds
 870   call cirrus_get_modeentry_nomask
 871
 872   push di
 873   xor ax, ax
 874   mov cx, #0x80
 875   rep
 876     stosw ;; clear buffer
 877   pop di
 878
 879   mov ax, #0x003b ;; mode
 880   stosw
 881   mov ax, #0x0007 ;; attr
 882   stosw
 883   mov ax, #0x0010 ;; granularity =16K
 884   stosw
 885   mov ax, #0x0040 ;; size =64K
 886   stosw
 887   mov ax, #0xA000 ;; segment A
 888   stosw
 889   xor ax, ax ;; no segment B
 890   stosw
 891   mov ax, #cirrus_vesa_05h_farentry
 892   stosw
 893   mov ax, cs
 894   stosw
 895   call cirrus_get_line_offset_entry
 896   stosw ;; bytes per scan line
 897   mov ax, [si+2] ;; width
 898   stosw
 899   mov ax, [si+4] ;; height
 900   stosw
 901   mov ax, #0x08
 902   stosb
 903   mov ax, #0x10
 904   stosb
 905   mov al, #1 ;; count of planes
 906   stosb
 907   mov al, [si+6] ;; bpp
 908   stosb
 909   mov al, #0x1 ;; XXX number of banks
 910   stosb
 911   mov al, [si+17]
 912   stosb ;; memory model
 913   mov al, #0x0   ;; XXX size of bank in K
 914   stosb
 915   call cirrus_get_line_offset_entry
 916   mov bx, [si+4]
 917   mul bx ;; dx:ax=vramdisp
 918   or ax, ax
 919   jz cirrus_vesa_01h_3
 920   inc dx
 921 cirrus_vesa_01h_3:
 922   call cirrus_extbios_85h ;; al=vram in 64k
 923   mov ah, #0x00
 924   mov cx, dx
 925   xor dx, dx
 926   div cx
 927   dec ax
 928   stosb  ;; number of image pages = vramtotal/vramdisp-1
 929   mov al, #0x00
 930   stosb
 931
 932   ;; v1.2+ stuffs
 933   push si
 934   add si, #18
 935   movsw
 936   movsw
 937   movsw
 938   movsw
 939   pop si
 940
 941   mov ah, [si+16]
 942   mov al, #0x0
 943   sub ah, #9
 944   rcl al, #1 ; bit 0=palette flag
 945   stosb ;; direct screen mode info
 946
 947   ;; v2.0+ stuffs
 948   ;; 32-bit LFB address
 949   xor ax, ax
 950   stosw
 951   call cirrus_get_lfb_addr
 952   stosw
 953   or ax, ax
 954   jz cirrus_vesa_01h_4
 955   push di
 956   mov di, bp
 957  db 0x26 ;; es:
 958   mov ax, [di]
 959   or ax, #0x0080 ;; mode bit 7:LFB
 960   stosw
 961   pop di
 962 cirrus_vesa_01h_4:
 963
 964   xor ax, ax
 965   stosw ; reserved
 966   stosw ; reserved
 967   stosw ; reserved
 968
 969   mov ax, #0x004F
 970   mov di, bp
 971   pop bx
 972   pop dx
 973   pop cx
 974   pop si
 975   pop ds
 976
 977   test cx, #0x4000 ;; LFB flag
 978   jz cirrus_vesa_01h_5
 979   push cx
 980  db 0x26 ;; es:
 981   mov cx, [di]
 982   cmp cx, #0x0080 ;; is LFB supported?
 983   jnz cirrus_vesa_01h_6
 984   mov ax, #0x014F ;; error - no LFB
 985 cirrus_vesa_01h_6:
 986   pop cx
 987 cirrus_vesa_01h_5:
 988   ret
 989
 990 cirrus_vesa_02h:
 991   ;; XXX support CRTC registers
 992   test bx, #0x3e00
 993   jnz cirrus_vesa_02h_2 ;; unknown flags
 994   mov ax, bx
 995   and ax, #0x1ff ;; bit 8-0 mode
 996   cmp ax, #0x100 ;; legacy VGA mode
 997   jb cirrus_vesa_02h_legacy
 998   call cirrus_vesamode_to_mode
 999   cmp ax, #0xffff
1000   jnz cirrus_vesa_02h_1
1001 cirrus_vesa_02h_2:
1002   jmp cirrus_vesa_unimplemented
1003 cirrus_vesa_02h_legacy:
1004 #ifdef CIRRUS_VESA3_PMINFO
1005  db 0x2e ;; cs:
1006   cmp byte ptr [cirrus_vesa_is_protected_mode], #0
1007   jnz cirrus_vesa_02h_2
1008 #endif // CIRRUS_VESA3_PMINFO
1009   int #0x10
1010   mov ax, #0x004F
1011   ret
1012 cirrus_vesa_02h_1:
1013   push si
1014   push ax
1015   call cirrus_get_modeentry_nomask
1016   call cirrus_switch_mode
1017   test bx, #0x4000 ;; LFB
1018   jnz cirrus_vesa_02h_3
1019   call cirrus_enable_16k_granularity
1020 cirrus_vesa_02h_3:
1021   test bx, #0x8000 ;; no clear
1022   jnz cirrus_vesa_02h_4
1023   push ax
1024   xor ax,ax
1025   call cirrus_clear_vram
1026   pop ax
1027 cirrus_vesa_02h_4:
1028   pop ax
1029   push ds
1030 #ifdef CIRRUS_VESA3_PMINFO
1031  db 0x2e ;; cs:
1032   mov si, [cirrus_vesa_sel0000_data]
1033 #else
1034   xor si, si
1035 #endif
1036   mov ds, si
1037   mov [PM_BIOSMEM_CURRENT_MODE], al
1038   mov [PM_BIOSMEM_VBE_MODE], bx
1039   pop ds
1040   pop si
1041   mov ax, #0x004F
1042   ret
1043
1044 cirrus_vesa_03h:
1045   push ds
1046 #ifdef CIRRUS_VESA3_PMINFO
1047  db 0x2e ;; cs:
1048   mov ax, [cirrus_vesa_sel0000_data]
1049 #else
1050   xor ax, ax
1051 #endif
1052   mov  ds, ax
1053   mov  bx, # PM_BIOSMEM_VBE_MODE
1054   mov  ax, [bx]
1055   mov  bx, ax
1056   test bx, bx
1057   jnz   cirrus_vesa_03h_1
1058   mov  bx, # PM_BIOSMEM_CURRENT_MODE
1059   mov  al, [bx]
1060   mov  bl, al
1061   xor  bh, bh
1062 cirrus_vesa_03h_1:
1063   mov  ax, #0x004f
1064   pop  ds
1065   ret
1066
1067 cirrus_vesa_05h_farentry:
1068   call cirrus_vesa_05h
1069   retf
1070
1071 cirrus_vesa_05h:
1072   cmp bl, #0x01
1073   ja cirrus_vesa_05h_1
1074   cmp bh, #0x00
1075   jz cirrus_vesa_05h_setmempage
1076   cmp bh, #0x01
1077   jz cirrus_vesa_05h_getmempage
1078 cirrus_vesa_05h_1:
1079   jmp cirrus_vesa_unimplemented
1080 cirrus_vesa_05h_setmempage:
1081   or dh, dh ; address must be < 0x100
1082   jnz cirrus_vesa_05h_1
1083   push dx
1084   mov al, bl ;; bl=bank number
1085   add al, #0x09
1086   mov ah, dl ;; dx=window address in granularity
1087   mov dx, #0x3ce
1088   out dx, ax
1089   pop dx
1090   mov ax, #0x004F
1091   ret
1092 cirrus_vesa_05h_getmempage:
1093   mov al, bl ;; bl=bank number
1094   add al, #0x09
1095   mov dx, #0x3ce
1096   out dx, al
1097   inc dx
1098   in al, dx
1099   xor dx, dx
1100   mov dl, al ;; dx=window address in granularity
1101   mov ax, #0x004F
1102   ret
1103
1104 cirrus_vesa_06h:
1105   mov  ax, cx
1106   cmp  bl, #0x01
1107   je   cirrus_vesa_06h_3
1108   cmp  bl, #0x02
1109   je   cirrus_vesa_06h_2
1110   jb   cirrus_vesa_06h_1
1111   mov  ax, #0x0100
1112   ret
1113 cirrus_vesa_06h_1:
1114   call cirrus_get_bpp_bytes
1115   mov  bl, al
1116   xor  bh, bh
1117   mov  ax, cx
1118   mul  bx
1119 cirrus_vesa_06h_2:
1120   call cirrus_set_line_offset
1121 cirrus_vesa_06h_3:
1122   call cirrus_get_bpp_bytes
1123   mov  bl, al
1124   xor  bh, bh
1125   xor  dx, dx
1126   call cirrus_get_line_offset
1127   push ax
1128   div  bx
1129   mov  cx, ax
1130   pop  bx
1131   call cirrus_extbios_85h ;; al=vram in 64k
1132   xor  dx, dx
1133   mov  dl, al
1134   xor  ax, ax
1135   div  bx
1136   mov  dx, ax
1137   mov  ax, #0x004f
1138   ret
1139
1140 cirrus_vesa_07h:
1141   cmp  bl, #0x80
1142   je   cirrus_vesa_07h_1
1143   cmp  bl, #0x01
1144   je   cirrus_vesa_07h_2
1145   jb   cirrus_vesa_07h_1
1146   mov  ax, #0x0100
1147   ret
1148 cirrus_vesa_07h_1:
1149   push dx
1150   call cirrus_get_bpp_bytes
1151   mov  bl, al
1152   xor  bh, bh
1153   mov  ax, cx
1154   mul  bx
1155   pop  bx
1156   push ax
1157   call cirrus_get_line_offset
1158   mul  bx
1159   pop  bx
1160   add  ax, bx
1161   jnc  cirrus_vesa_07h_3
1162   inc  dx
1163 cirrus_vesa_07h_3:
1164   push dx
1165   and  dx, #0x0003
1166   mov  bx, #0x04
1167   div  bx
1168   pop  dx
1169   shr  dx, #2
1170   call cirrus_set_start_addr
1171   mov  ax, #0x004f
1172   ret
1173 cirrus_vesa_07h_2:
1174   call cirrus_get_start_addr
1175   shl  dx, #2
1176   push dx
1177   mov  bx, #0x04
1178   mul  bx
1179   pop  bx
1180   or   dx, bx
1181   push ax
1182   call cirrus_get_line_offset
1183   mov  bx, ax
1184   pop  ax
1185   div  bx
1186   push ax
1187   push dx
1188   call cirrus_get_bpp_bytes
1189   mov  bl, al
1190   xor  bh, bh
1191   pop  ax
1192   xor  dx, dx
1193   div  bx
1194   mov  cx, ax
1195   pop  dx
1196   mov  ax, #0x004f
1197   ret
1198
1199 cirrus_vesa_10h:
1200   cmp bl, #0x00
1201   jne cirrus_vesa_10h_01
1202   mov bx, #0x0f30
1203   mov ax, #0x004f
1204   ret
1205 cirrus_vesa_10h_01:
1206   cmp bl, #0x01
1207   jne cirrus_vesa_10h_02
1208   push dx
1209   push ds
1210   mov dx, #0x40
1211   mov ds, dx
1212   mov [0xb9], bh
1213   pop ds
1214   pop dx
1215   mov ax, #0x004f
1216   ret
1217 cirrus_vesa_10h_02:
1218   cmp bl, #0x02
1219   jne cirrus_vesa_unimplemented
1220   push dx
1221   push ds
1222   mov dx, #0x40
1223   mov ds, dx
1224   mov bh, [0xb9]
1225   pop ds
1226   pop dx
1227   mov ax, #0x004f
1228   ret
1229
1230 cirrus_vesa_unimplemented:
1231   mov ax, #0x014F ;; not implemented
1232   ret
1233
1234
1235 ;; in ax:vesamode, out ax:cirrusmode
1236 cirrus_vesamode_to_mode:
1237   push ds
1238   push cx
1239   push si
1240   push cs
1241   pop ds
1242   mov cx, #0xffff
1243   mov si, #_cirrus_vesa_modelist
1244 cvtm_1:
1245   cmp [si],ax
1246   jz cvtm_2
1247   cmp [si],cx
1248   jz cvtm_2
1249   add si, #4
1250   jmp cvtm_1
1251 cvtm_2:
1252   mov ax,[si+2]
1253   pop si
1254   pop cx
1255   pop ds
1256   ret
1257
1258   ; cirrus_get_crtc
1259   ;; NOTE - may be called in protected mode
1260 cirrus_get_crtc:
1261   push ds
1262   push ax
1263   mov  dx, #0x3cc
1264   in   al, dx
1265   and  al, #0x01
1266   shl  al, #5
1267   mov  dx, #0x3b4
1268   add  dl, al
1269   pop  ax
1270   pop  ds
1271   ret
1272
1273 ;; in - al:mode, out - cflag:result, si:table, ax:destroyed
1274 cirrus_get_modeentry:
1275   and al, #0x7f
1276 cirrus_get_modeentry_nomask:
1277   mov si, #_cirrus_modes
1278 cgm_1:
1279  db 0x2e ;; cs:
1280   mov ah, [si]
1281   cmp al, ah
1282   jz cgm_2
1283   cmp ah, #0xff
1284   jz cgm_4
1285   add si, # CIRRUS_MODE_SIZE
1286   jmp cgm_1
1287 cgm_4:
1288   xor si, si
1289   stc ;; video mode is not supported
1290   jmp cgm_3
1291 cgm_2:
1292   clc ;; video mode is supported
1293 cgm_3:
1294   ret
1295
1296   ; get LFB address
1297   ; out - ax:LFB address (high 16 bit)
1298   ;; NOTE - may be called in protected mode
1299 cirrus_get_lfb_addr:
1300   push cx
1301   push dx
1302   push eax
1303     xor cx, cx
1304     mov dl, #0x00
1305     call cirrus_pci_read
1306     cmp ax, #0xffff
1307     jz cirrus_get_lfb_addr_5
1308  cirrus_get_lfb_addr_3:
1309     mov dl, #0x00
1310     call cirrus_pci_read
1311     cmp ax, #0x1013 ;; cirrus
1312     jz cirrus_get_lfb_addr_4
1313     add cx, #0x8
1314     cmp cx, #0x200 ;; search bus #0 and #1
1315     jb cirrus_get_lfb_addr_3
1316  cirrus_get_lfb_addr_5:
1317     xor dx, dx ;; no LFB
1318     jmp cirrus_get_lfb_addr_6
1319  cirrus_get_lfb_addr_4:
1320     mov dl, #0x10 ;; I/O space #0
1321     call cirrus_pci_read
1322     test ax, #0xfff1
1323     jnz cirrus_get_lfb_addr_5
1324     shr eax, #16
1325     mov dx, ax ;; LFB address
1326  cirrus_get_lfb_addr_6:
1327   pop eax
1328   mov ax, dx
1329   pop dx
1330   pop cx
1331   ret
1332
1333 cirrus_pci_read:
1334   mov eax, #0x00800000
1335   mov ax, cx
1336   shl eax, #8
1337   mov al, dl
1338   mov dx, #0xcf8
1339   out dx, eax
1340   add dl, #4
1341   in  eax, dx
1342   ret
1343
1344 ;; out - al:bytes per pixel
1345 cirrus_get_bpp_bytes:
1346   push dx
1347   mov  dx, #0x03c4
1348   mov  al, #0x07
1349   out  dx, al
1350   inc  dx
1351   in   al, dx
1352   and  al, #0x0e
1353   cmp  al, #0x06
1354   jne  cirrus_get_bpp_bytes_1
1355   and  al, #0x02
1356 cirrus_get_bpp_bytes_1:
1357   shr  al, #1
1358   cmp  al, #0x04
1359   je  cirrus_get_bpp_bytes_2
1360   inc  al
1361 cirrus_get_bpp_bytes_2:
1362   pop  dx
1363   ret
1364
1365 ;; in - ax: new line offset
1366 cirrus_set_line_offset:
1367   shr  ax, #3
1368   push ax
1369   call cirrus_get_crtc
1370   mov  al, #0x13
1371   out  dx, al
1372   inc  dx
1373   pop  ax
1374   out  dx, al
1375   dec  dx
1376   mov  al, #0x1b
1377   out  dx, al
1378   inc  dx
1379   shl  ah, #4
1380   in   al, dx
1381   and  al, #ef
1382   or   al, ah
1383   out  dx, al
1384   ret
1385
1386 ;; out - ax: active line offset
1387 cirrus_get_line_offset:
1388   push dx
1389   push bx
1390   call cirrus_get_crtc
1391   mov  al, #0x13
1392   out  dx, al
1393   inc  dx
1394   in   al, dx
1395   mov  bl, al
1396   dec  dx
1397   mov  al, #0x1b
1398   out  dx, al
1399   inc  dx
1400   in   al, dx
1401   mov  ah, al
1402   shr  ah, #4
1403   and  ah, #0x01
1404   mov  al, bl
1405   shl  ax, #3
1406   pop  bx
1407   pop  dx
1408   ret
1409
1410 ;; in - si: table
1411 ;; out - ax: line offset for mode
1412 cirrus_get_line_offset_entry:
1413   push bx
1414   mov  bx, [si+14] ;; crtc table
1415   push bx
1416 offset_loop1:
1417   mov  ax, [bx]
1418   cmp  al, #0x13
1419   je   offset_found1
1420   inc  bx
1421   inc  bx
1422   jnz  offset_loop1
1423 offset_found1:
1424   xor  al, al
1425   shr  ax, #5
1426   pop  bx
1427   push ax
1428 offset_loop2:
1429   mov  ax, [bx]
1430   cmp  al, #0x1b
1431   je offset_found2
1432   inc  bx
1433   inc  bx
1434   jnz offset_loop2
1435 offset_found2:
1436   pop  bx
1437   and  ax, #0x1000
1438   shr  ax, #1
1439   or   ax, bx
1440   pop  bx
1441   ret
1442
1443 ;; in - new address in DX:AX
1444 cirrus_set_start_addr:
1445   push bx
1446   push dx
1447   push ax
1448   call cirrus_get_crtc
1449   mov  al, #0x0d
1450   out  dx, al
1451   inc  dx
1452   pop  ax
1453   out  dx, al
1454   dec  dx
1455   mov  al, #0x0c
1456   out  dx, al
1457   inc  dx
1458   mov  al, ah
1459   out  dx, al
1460   dec  dx
1461   mov  al, #0x1d
1462   out  dx, al
1463   inc  dx
1464   in   al, dx
1465   and  al, #0x7f
1466   pop  bx
1467   mov  ah, bl
1468   shl  bl, #4
1469   and  bl, #0x80
1470   or   al, bl
1471   out  dx, al
1472   dec  dx
1473   mov  bl, ah
1474   and  ah, #0x01
1475   shl  bl, #1
1476   and  bl, #0x0c
1477   or   ah, bl
1478   mov  al, #0x1b
1479   out  dx, al
1480   inc  dx
1481   in   al, dx
1482   and  al, #0xf2
1483   or   al, ah
1484   out  dx, al
1485   pop  bx
1486   ret
1487
1488 ;; out - current address in DX:AX
1489 cirrus_get_start_addr:
1490   push bx
1491   call cirrus_get_crtc
1492   mov  al, #0x0c
1493   out  dx, al
1494   inc  dx
1495   in   al, dx
1496   mov  ah, al
1497   dec  dx
1498   mov  al, #0x0d
1499   out  dx, al
1500   inc  dx
1501   in   al, dx
1502   push ax
1503   dec  dx
1504   mov  al, #0x1b
1505   out  dx, al
1506   inc  dx
1507   in   al, dx
1508   dec  dx
1509   mov  bl, al
1510   and  al, #0x01
1511   and  bl, #0x0c
1512   shr  bl, #1
1513   or   bl, al
1514   mov  al, #0x1d
1515   out  dx, al
1516   inc  dx
1517   in   al, dx
1518   and  al, #0x80
1519   shr  al, #4
1520   or   bl, al
1521   mov  dl, bl
1522   xor  dh, dh
1523   pop  ax
1524   pop  bx
1525   ret
1526
1527 cirrus_clear_vram:
1528   pusha
1529   push es
1530   mov si, ax
1531
1532   call cirrus_enable_16k_granularity
1533   call cirrus_extbios_85h
1534   shl al, #2
1535   mov bl, al
1536   xor ah,ah
1537 cirrus_clear_vram_1:
1538   mov al, #0x09
1539   mov dx, #0x3ce
1540   out dx, ax
1541   push ax
1542   mov cx, #0xa000
1543   mov es, cx
1544   xor di, di
1545   mov ax, si
1546   mov cx, #8192
1547   cld
1548   rep
1549       stosw
1550   pop ax
1551   inc ah
1552   cmp ah, bl
1553   jne cirrus_clear_vram_1
1554
1555   xor ah,ah
1556   mov dx, #0x3ce
1557   out dx, ax
1558
1559   pop es
1560   popa
1561   ret
1562
1563 cirrus_extbios_handlers:
1564   ;; 80h
1565   dw cirrus_extbios_80h
1566   dw cirrus_extbios_81h
1567   dw cirrus_extbios_82h
1568   dw cirrus_extbios_unimplemented
1569   ;; 84h
1570   dw cirrus_extbios_unimplemented
1571   dw cirrus_extbios_85h
1572   dw cirrus_extbios_unimplemented
1573   dw cirrus_extbios_unimplemented
1574   ;; 88h
1575   dw cirrus_extbios_unimplemented
1576   dw cirrus_extbios_unimplemented
1577   dw cirrus_extbios_unimplemented
1578   dw cirrus_extbios_unimplemented
1579   ;; 8Ch
1580   dw cirrus_extbios_unimplemented
1581   dw cirrus_extbios_unimplemented
1582   dw cirrus_extbios_unimplemented
1583   dw cirrus_extbios_unimplemented
1584   ;; 90h
1585   dw cirrus_extbios_unimplemented
1586   dw cirrus_extbios_unimplemented
1587   dw cirrus_extbios_unimplemented
1588   dw cirrus_extbios_unimplemented
1589   ;; 94h
1590   dw cirrus_extbios_unimplemented
1591   dw cirrus_extbios_unimplemented
1592   dw cirrus_extbios_unimplemented
1593   dw cirrus_extbios_unimplemented
1594   ;; 98h
1595   dw cirrus_extbios_unimplemented
1596   dw cirrus_extbios_unimplemented
1597   dw cirrus_extbios_9Ah
1598   dw cirrus_extbios_unimplemented
1599   ;; 9Ch
1600   dw cirrus_extbios_unimplemented
1601   dw cirrus_extbios_unimplemented
1602   dw cirrus_extbios_unimplemented
1603   dw cirrus_extbios_unimplemented
1604   ;; A0h
1605   dw cirrus_extbios_A0h
1606   dw cirrus_extbios_A1h
1607   dw cirrus_extbios_A2h
1608   dw cirrus_extbios_unimplemented
1609   ;; A4h
1610   dw cirrus_extbios_unimplemented
1611   dw cirrus_extbios_unimplemented
1612   dw cirrus_extbios_unimplemented
1613   dw cirrus_extbios_unimplemented
1614   ;; A8h
1615   dw cirrus_extbios_unimplemented
1616   dw cirrus_extbios_unimplemented
1617   dw cirrus_extbios_unimplemented
1618   dw cirrus_extbios_unimplemented
1619   ;; ACh
1620   dw cirrus_extbios_unimplemented
1621   dw cirrus_extbios_unimplemented
1622   dw cirrus_extbios_AEh
1623   dw cirrus_extbios_unimplemented
1624
1625 cirrus_vesa_handlers:
1626   ;; 00h
1627   dw cirrus_vesa_00h
1628   dw cirrus_vesa_01h
1629   dw cirrus_vesa_02h
1630   dw cirrus_vesa_03h
1631   ;; 04h
1632   dw cirrus_vesa_unimplemented
1633   dw cirrus_vesa_05h
1634   dw cirrus_vesa_06h
1635   dw cirrus_vesa_07h
1636   ;; 08h
1637   dw cirrus_vesa_unimplemented
1638   dw cirrus_vesa_unimplemented
1639   dw cirrus_vesa_unimplemented
1640   dw cirrus_vesa_unimplemented
1641   ;; 0Ch
1642   dw cirrus_vesa_unimplemented
1643   dw cirrus_vesa_unimplemented
1644   dw cirrus_vesa_unimplemented
1645   dw cirrus_vesa_unimplemented
1646   ;; 10h
1647   dw cirrus_vesa_10h
1648
1649
1650 ASM_END
1651
1652 #ifdef CIRRUS_VESA3_PMINFO
1653 ASM_START
1654 cirrus_vesa_pminfo:
1655   /* + 0 */
1656   .byte 0x50,0x4d,0x49,0x44 ;; signature[4]
1657   /* + 4 */
1658   dw cirrus_vesa_pmbios_entry ;; entry_bios
1659   dw cirrus_vesa_pmbios_init  ;; entry_init
1660   /* + 8 */
1661 cirrus_vesa_sel0000_data:
1662   dw 0x0000 ;; sel_00000
1663 cirrus_vesa_selA000_data:
1664   dw 0xA000 ;; sel_A0000
1665   /* +12 */
1666 cirrus_vesa_selB000_data:
1667   dw 0xB000 ;; sel_B0000
1668 cirrus_vesa_selB800_data:
1669   dw 0xB800 ;; sel_B8000
1670   /* +16 */
1671 cirrus_vesa_selC000_data:
1672   dw 0xC000 ;; sel_C0000
1673 cirrus_vesa_is_protected_mode:
1674   ;; protected mode flag and checksum
1675   dw (~((0xf2 + (cirrus_vesa_pmbios_entry >> 8) + (cirrus_vesa_pmbios_entry) \
1676      + (cirrus_vesa_pmbios_init >> 8) + (cirrus_vesa_pmbios_init)) & 0xff) << 8) + 0x01
1677 ASM_END
1678 #endif // CIRRUS_VESA3_PMINFO
1679
1680
1681 #ifdef CIRRUS_DEBUG
1682 static void cirrus_debugmsg(DI, SI, BP, SP, BX, DX, CX, AX, DS, ES, FLAGS)
1683   Bit16u DI, SI, BP, SP, BX, DX, CX, AX, ES, DS, FLAGS;
1684 {
1685  if((GET_AH()!=0x0E)&&(GET_AH()!=0x02)&&(GET_AH()!=0x09)&&(AX!=0x4F05))
1686   printf("vgabios call ah%02x al%02x bx%04x cx%04x dx%04x\n",GET_AH(),GET_AL(),BX,CX,DX);
1687 }
1688 #endif