vgasrc/vga.c

   1 // VGA bios implementation
   2 //
   3 // Copyright (C) 2009  Kevin O'Connor <kevin@koconnor.net>
   4 // Copyright (C) 2001-2008 the LGPL VGABios developers Team
   5 //
   6 // This file may be distributed under the terms of the GNU LGPLv3 license.
   7
   8
   9 // TODO:
  10 //  * review correctness of converted asm by comparing with RBIL
  11 //
  12 //  * convert vbe/clext code
  13
  14 #include "bregs.h" // struct bregs
  15 #include "biosvar.h" // GET_BDA
  16 #include "util.h" // memset
  17 #include "vgatables.h" // find_vga_entry
  18
  19 // XXX
  20 #define CONFIG_VBE 0
  21 #define CONFIG_CIRRUS 0
  22
  23 // XXX
  24 #define DEBUG_VGA_POST 1
  25 #define DEBUG_VGA_10 3
  26
  27 #define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
  28
  29
  30 /****************************************************************
  31  * Helper functions
  32  ****************************************************************/
  33
  34 static inline void
  35 call16_vgaint(u32 eax, u32 ebx)
  36 {
  37     asm volatile(
  38         "int $0x10\n"
  39         "cli\n"
  40         "cld"
  41         :
  42         : "a"(eax), "b"(ebx)
  43         : "cc", "memory");
  44 }
  45
  46 static void
  47 perform_gray_scale_summing(u16 start, u16 count)
  48 {
  49     vgahw_screen_disable();
  50     int i;
  51     for (i = start; i < start+count; i++) {
  52         u8 rgb[3];
  53         vgahw_get_dac_regs(GET_SEG(SS), rgb, i, 1);
  54
  55         // intensity = ( 0.3 * Red ) + ( 0.59 * Green ) + ( 0.11 * Blue )
  56         u16 intensity = ((77 * rgb[0] + 151 * rgb[1] + 28 * rgb[2]) + 0x80) >> 8;
  57         if (intensity > 0x3f)
  58             intensity = 0x3f;
  59
  60         vgahw_set_dac_regs(GET_SEG(SS), rgb, i, 1);
  61     }
  62     vgahw_screen_enable();
  63 }
  64
  65 static void
  66 set_cursor_shape(u8 start, u8 end)
  67 {
  68     start &= 0x3f;
  69     end &= 0x1f;
  70
  71     u16 curs = (start << 8) + end;
  72     SET_BDA(cursor_type, curs);
  73
  74     u8 modeset_ctl = GET_BDA(modeset_ctl);
  75     u16 cheight = GET_BDA(char_height);
  76     if ((modeset_ctl & 0x01) && (cheight > 8) && (end < 8) && (start < 0x20)) {
  77         if (end != (start + 1))
  78             start = ((start + 1) * cheight / 8) - 1;
  79         else
  80             start = ((end + 1) * cheight / 8) - 2;
  81         end = ((end + 1) * cheight / 8) - 1;
  82     }
  83     vgahw_set_cursor_shape(start, end);
  84 }
  85
  86 static u16
  87 get_cursor_shape(u8 page)
  88 {
  89     if (page > 7)
  90         return 0;
  91     // FIXME should handle VGA 14/16 lines
  92     return GET_BDA(cursor_type);
  93 }
  94
  95 static void
  96 set_cursor_pos(struct cursorpos cp)
  97 {
  98     // Should not happen...
  99     if (cp.page > 7)
 100         return;
 101
 102     // Bios cursor pos
 103     SET_BDA(cursor_pos[cp.page], (cp.y << 8) | cp.x);
 104
 105     // Set the hardware cursor
 106     u8 current = GET_BDA(video_page);
 107     if (cp.page != current)
 108         return;
 109
 110     // Get the dimensions
 111     u16 nbcols = GET_BDA(video_cols);
 112     u16 nbrows = GET_BDA(video_rows) + 1;
 113
 114     // Calculate the address knowing nbcols nbrows and page num
 115     u16 address = (SCREEN_IO_START(nbcols, nbrows, cp.page)
 116                    + cp.x + cp.y * nbcols);
 117
 118     vgahw_set_cursor_pos(address);
 119 }
 120
 121 static struct cursorpos
 122 get_cursor_pos(u8 page)
 123 {
 124     if (page == 0xff)
 125         // special case - use current page
 126         page = GET_BDA(video_page);
 127     if (page > 7) {
 128         struct cursorpos cp = { 0, 0, 0xfe };
 129         return cp;
 130     }
 131     // FIXME should handle VGA 14/16 lines
 132     u16 xy = GET_BDA(cursor_pos[page]);
 133     struct cursorpos cp = {xy, xy>>8, page};
 134     return cp;
 135 }
 136
 137 static void
 138 set_active_page(u8 page)
 139 {
 140     if (page > 7)
 141         return;
 142
 143     // Get the mode
 144     struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
 145     if (!vmode_g)
 146         return;
 147
 148     // Get pos curs pos for the right page
 149     struct cursorpos cp = get_cursor_pos(page);
 150
 151     u16 address;
 152     if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
 153         // Get the dimensions
 154         u16 nbcols = GET_BDA(video_cols);
 155         u16 nbrows = GET_BDA(video_rows) + 1;
 156
 157         // Calculate the address knowing nbcols nbrows and page num
 158         address = SCREEN_MEM_START(nbcols, nbrows, page);
 159         SET_BDA(video_pagestart, address);
 160
 161         // Start address
 162         address = SCREEN_IO_START(nbcols, nbrows, page);
 163     } else {
 164         struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
 165         address = page * GET_GLOBAL(vparam_g->slength);
 166     }
 167
 168     vgahw_set_active_page(address);
 169
 170     // And change the BIOS page
 171     SET_BDA(video_page, page);
 172
 173     dprintf(1, "Set active page %02x address %04x\n", page, address);
 174
 175     // Display the cursor, now the page is active
 176     set_cursor_pos(cp);
 177 }
 178
 179 static void
 180 set_scan_lines(u8 lines)
 181 {
 182     vgahw_set_scan_lines(lines);
 183     if (lines == 8)
 184         set_cursor_shape(0x06, 0x07);
 185     else
 186         set_cursor_shape(lines - 4, lines - 3);
 187     SET_BDA(char_height, lines);
 188     u16 vde = vgahw_get_vde();
 189     u8 rows = vde / lines;
 190     SET_BDA(video_rows, rows - 1);
 191     u16 cols = GET_BDA(video_cols);
 192     SET_BDA(video_pagesize, rows * cols * 2);
 193 }
 194
 195
 196 /****************************************************************
 197  * Character writing
 198  ****************************************************************/
 199
 200 // Scroll the screen one line.  This function is designed to be called
 201 // tail-recursive to reduce stack usage.
 202 static void noinline
 203 scroll_one(u16 nbrows, u16 nbcols, u8 page)
 204 {
 205     struct cursorpos ul = {0, 0, page};
 206     struct cursorpos lr = {nbcols-1, nbrows-1, page};
 207     vgafb_scroll(1, -1, ul, lr);
 208 }
 209
 210 // Write a character to the screen at a given position.  Implement
 211 // special characters and scroll the screen if necessary.
 212 static void
 213 write_teletype(struct cursorpos *pcp, struct carattr ca)
 214 {
 215     struct cursorpos cp = *pcp;
 216
 217     // Get the dimensions
 218     u16 nbrows = GET_BDA(video_rows) + 1;
 219     u16 nbcols = GET_BDA(video_cols);
 220
 221     switch (ca.car) {
 222     case 7:
 223         //FIXME should beep
 224         break;
 225     case 8:
 226         if (cp.x > 0)
 227             cp.x--;
 228         break;
 229     case '\r':
 230         cp.x = 0;
 231         break;
 232     case '\n':
 233         cp.y++;
 234         break;
 235     case '\t':
 236         do {
 237             struct carattr dummyca = {' ', ca.attr, ca.use_attr};
 238             vgafb_write_char(cp, dummyca);
 239             cp.x++;
 240         } while (cp.x < nbcols && cp.x % 8);
 241         break;
 242     default:
 243         vgafb_write_char(cp, ca);
 244         cp.x++;
 245     }
 246
 247     // Do we need to wrap ?
 248     if (cp.x == nbcols) {
 249         cp.x = 0;
 250         cp.y++;
 251     }
 252     // Do we need to scroll ?
 253     if (cp.y < nbrows) {
 254         *pcp = cp;
 255         return;
 256     }
 257     // Scroll screen
 258     cp.y--;
 259     *pcp = cp;
 260     scroll_one(nbrows, nbcols, cp.page);
 261 }
 262
 263 // Write out a buffer of alternating characters and attributes.
 264 static void
 265 write_attr_string(struct cursorpos *pcp, u16 count, u16 seg, u8 *offset_far)
 266 {
 267     while (count--) {
 268         u8 car = GET_FARVAR(seg, *offset_far);
 269         offset_far++;
 270         u8 attr = GET_FARVAR(seg, *offset_far);
 271         offset_far++;
 272
 273         struct carattr ca = {car, attr, 1};
 274         write_teletype(pcp, ca);
 275     }
 276 }
 277
 278 // Write out a buffer of characters.
 279 static void
 280 write_string(struct cursorpos *pcp, u8 attr, u16 count, u16 seg, u8 *offset_far)
 281 {
 282     while (count--) {
 283         u8 car = GET_FARVAR(seg, *offset_far);
 284         offset_far++;
 285
 286         struct carattr ca = {car, attr, 1};
 287         write_teletype(pcp, ca);
 288     }
 289 }
 290
 291
 292 /****************************************************************
 293  * Save and restore bda state
 294  ****************************************************************/
 295
 296 static void
 297 save_bda_state(u16 seg, struct saveBDAstate *info)
 298 {
 299     SET_FARVAR(seg, info->video_mode, GET_BDA(video_mode));
 300     SET_FARVAR(seg, info->video_cols, GET_BDA(video_cols));
 301     SET_FARVAR(seg, info->video_pagesize, GET_BDA(video_pagesize));
 302     SET_FARVAR(seg, info->crtc_address, GET_BDA(crtc_address));
 303     SET_FARVAR(seg, info->video_rows, GET_BDA(video_rows));
 304     SET_FARVAR(seg, info->char_height, GET_BDA(char_height));
 305     SET_FARVAR(seg, info->video_ctl, GET_BDA(video_ctl));
 306     SET_FARVAR(seg, info->video_switches, GET_BDA(video_switches));
 307     SET_FARVAR(seg, info->modeset_ctl, GET_BDA(modeset_ctl));
 308     SET_FARVAR(seg, info->cursor_type, GET_BDA(cursor_type));
 309     u16 i;
 310     for (i=0; i<8; i++)
 311         SET_FARVAR(seg, info->cursor_pos[i], GET_BDA(cursor_pos[i]));
 312     SET_FARVAR(seg, info->video_pagestart, GET_BDA(video_pagestart));
 313     SET_FARVAR(seg, info->video_page, GET_BDA(video_page));
 314     /* current font */
 315     SET_FARVAR(seg, info->font0, GET_IVT(0x1f));
 316     SET_FARVAR(seg, info->font1, GET_IVT(0x43));
 317 }
 318
 319 static void
 320 restore_bda_state(u16 seg, struct saveBDAstate *info)
 321 {
 322     SET_BDA(video_mode, GET_FARVAR(seg, info->video_mode));
 323     SET_BDA(video_cols, GET_FARVAR(seg, info->video_cols));
 324     SET_BDA(video_pagesize, GET_FARVAR(seg, info->video_pagesize));
 325     SET_BDA(crtc_address, GET_FARVAR(seg, info->crtc_address));
 326     SET_BDA(video_rows, GET_FARVAR(seg, info->video_rows));
 327     SET_BDA(char_height, GET_FARVAR(seg, info->char_height));
 328     SET_BDA(video_ctl, GET_FARVAR(seg, info->video_ctl));
 329     SET_BDA(video_switches, GET_FARVAR(seg, info->video_switches));
 330     SET_BDA(modeset_ctl, GET_FARVAR(seg, info->modeset_ctl));
 331     SET_BDA(cursor_type, GET_FARVAR(seg, info->cursor_type));
 332     u16 i;
 333     for (i = 0; i < 8; i++)
 334         SET_BDA(cursor_pos[i], GET_FARVAR(seg, info->cursor_pos[i]));
 335     SET_BDA(video_pagestart, GET_FARVAR(seg, info->video_pagestart));
 336     SET_BDA(video_page, GET_FARVAR(seg, info->video_page));
 337     /* current font */
 338     SET_IVT(0x1f, GET_FARVAR(seg, info->font0));
 339     SET_IVT(0x43, GET_FARVAR(seg, info->font1));
 340 }
 341
 342
 343 /****************************************************************
 344  * VGA int 10 handler
 345  ****************************************************************/
 346
 347 // set video mode
 348 static void
 349 handle_1000(struct bregs *regs)
 350 {
 351     u8 noclearmem = regs->al & 0x80;
 352     u8 mode = regs->al & 0x7f;
 353
 354     // Set regs->al
 355     if (mode > 7)
 356         regs->al = 0x20;
 357     else if (mode == 6)
 358         regs->al = 0x3f;
 359     else
 360         regs->al = 0x30;
 361
 362     if (CONFIG_CIRRUS)
 363         cirrus_set_video_mode(mode);
 364
 365     if (CONFIG_VBE)
 366         if (vbe_has_vbe_display())
 367             dispi_set_enable(VBE_DISPI_DISABLED);
 368
 369     // find the entry in the video modes
 370     struct vgamode_s *vmode_g = find_vga_entry(mode);
 371     dprintf(1, "mode search %02x found %p\n", mode, vmode_g);
 372     if (!vmode_g)
 373         return;
 374
 375     // Read the bios mode set control
 376     u8 modeset_ctl = GET_BDA(modeset_ctl);
 377
 378     // Then we know the number of lines
 379 // FIXME
 380
 381     // if palette loading (bit 3 of modeset ctl = 0)
 382     if ((modeset_ctl & 0x08) == 0) {    // Set the PEL mask
 383         vgahw_set_pel_mask(GET_GLOBAL(vmode_g->pelmask));
 384
 385         // From which palette
 386         u8 *palette_g = GET_GLOBAL(vmode_g->dac);
 387         u16 palsize = GET_GLOBAL(vmode_g->dacsize) / 3;
 388
 389         // Always 256*3 values
 390         vgahw_set_dac_regs(get_global_seg(), palette_g, 0, palsize);
 391         u16 i;
 392         for (i = palsize; i < 0x0100; i++) {
 393             static u8 rgb[3] VAR16;
 394             vgahw_set_dac_regs(get_global_seg(), rgb, i, 1);
 395         }
 396
 397         if ((modeset_ctl & 0x02) == 0x02)
 398             perform_gray_scale_summing(0x00, 0x100);
 399     }
 400
 401     struct VideoParam_s *vparam_g = GET_GLOBAL(vmode_g->vparam);
 402     vgahw_set_mode(vparam_g);
 403
 404     if (noclearmem == 0x00)
 405         clear_screen(vmode_g);
 406
 407     // Set CRTC address VGA or MDA
 408     u16 crtc_addr = VGAREG_VGA_CRTC_ADDRESS;
 409     if (GET_GLOBAL(vmode_g->memmodel) == MTEXT)
 410         crtc_addr = VGAREG_MDA_CRTC_ADDRESS;
 411
 412     // Set the BIOS mem
 413     u16 cheight = GET_GLOBAL(vparam_g->cheight);
 414     SET_BDA(video_mode, mode);
 415     SET_BDA(video_cols, GET_GLOBAL(vparam_g->twidth));
 416     SET_BDA(video_pagesize, GET_GLOBAL(vparam_g->slength));
 417     SET_BDA(crtc_address, crtc_addr);
 418     SET_BDA(video_rows, GET_GLOBAL(vparam_g->theightm1));
 419     SET_BDA(char_height, cheight);
 420     SET_BDA(video_ctl, (0x60 | noclearmem));
 421     SET_BDA(video_switches, 0xF9);
 422     SET_BDA(modeset_ctl, GET_BDA(modeset_ctl) & 0x7f);
 423
 424     // FIXME We nearly have the good tables. to be reworked
 425     SET_BDA(dcc_index, 0x08);   // 8 is VGA should be ok for now
 426     SET_BDA(video_savetable
 427             , SEGOFF(get_global_seg(), (u32)video_save_pointer_table));
 428
 429     // FIXME
 430     SET_BDA(video_msr, 0x00); // Unavailable on vanilla vga, but...
 431     SET_BDA(video_pal, 0x00); // Unavailable on vanilla vga, but...
 432
 433     // Set cursor shape
 434     if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
 435         set_cursor_shape(0x06, 0x07);
 436     // Set cursor pos for page 0..7
 437     int i;
 438     for (i = 0; i < 8; i++) {
 439         struct cursorpos cp = {0, 0, i};
 440         set_cursor_pos(cp);
 441     }
 442
 443     // Set active page 0
 444     set_active_page(0x00);
 445
 446     // Write the fonts in memory
 447     if (GET_GLOBAL(vmode_g->memmodel) & TEXT) {
 448         call16_vgaint(0x1104, 0);
 449         call16_vgaint(0x1103, 0);
 450     }
 451     // Set the ints 0x1F and 0x43
 452     SET_IVT(0x1f, SEGOFF(get_global_seg(), (u32)&vgafont8[128 * 8]));
 453
 454     switch (cheight) {
 455     case 8:
 456         SET_IVT(0x43, SEGOFF(get_global_seg(), (u32)vgafont8));
 457         break;
 458     case 14:
 459         SET_IVT(0x43, SEGOFF(get_global_seg(), (u32)vgafont14));
 460         break;
 461     case 16:
 462         SET_IVT(0x43, SEGOFF(get_global_seg(), (u32)vgafont16));
 463         break;
 464     }
 465 }
 466
 467 static void
 468 handle_1001(struct bregs *regs)
 469 {
 470     set_cursor_shape(regs->ch, regs->cl);
 471 }
 472
 473 static void
 474 handle_1002(struct bregs *regs)
 475 {
 476     struct cursorpos cp = {regs->dl, regs->dh, regs->bh};
 477     set_cursor_pos(cp);
 478 }
 479
 480 static void
 481 handle_1003(struct bregs *regs)
 482 {
 483     regs->cx = get_cursor_shape(regs->bh);
 484     struct cursorpos cp = get_cursor_pos(regs->bh);
 485     regs->dl = cp.x;
 486     regs->dh = cp.y;
 487 }
 488
 489 // Read light pen pos (unimplemented)
 490 static void
 491 handle_1004(struct bregs *regs)
 492 {
 493     debug_stub(regs);
 494     regs->ax = regs->bx = regs->cx = regs->dx = 0;
 495 }
 496
 497 static void
 498 handle_1005(struct bregs *regs)
 499 {
 500     set_active_page(regs->al);
 501 }
 502
 503 static void
 504 verify_scroll(struct bregs *regs, int dir)
 505 {
 506     u8 page = GET_BDA(video_page);
 507     struct cursorpos ul = {regs->cl, regs->ch, page};
 508     struct cursorpos lr = {regs->dl, regs->dh, page};
 509
 510     u16 nbrows = GET_BDA(video_rows) + 1;
 511     if (lr.y >= nbrows)
 512         lr.y = nbrows - 1;
 513     u16 nbcols = GET_BDA(video_cols);
 514     if (lr.x >= nbcols)
 515         lr.x = nbcols - 1;
 516
 517     if (ul.x > lr.x || ul.y > lr.y)
 518         return;
 519
 520     u16 nblines = regs->al;
 521     if (!nblines || nblines > lr.y - ul.y + 1)
 522         nblines = lr.y - ul.y + 1;
 523
 524     vgafb_scroll(dir * nblines, regs->bh, ul, lr);
 525 }
 526
 527 static void
 528 handle_1006(struct bregs *regs)
 529 {
 530     verify_scroll(regs, 1);
 531 }
 532
 533 static void
 534 handle_1007(struct bregs *regs)
 535 {
 536     verify_scroll(regs, -1);
 537 }
 538
 539 static void
 540 handle_1008(struct bregs *regs)
 541 {
 542     struct carattr ca = vgafb_read_char(get_cursor_pos(regs->bh));
 543     regs->al = ca.car;
 544     regs->ah = ca.attr;
 545 }
 546
 547 static void noinline
 548 write_chars(u8 page, struct carattr ca, u16 count)
 549 {
 550     struct cursorpos cp = get_cursor_pos(page);
 551     while (count--) {
 552         vgafb_write_char(cp, ca);
 553         cp.x++;
 554     }
 555 }
 556
 557 static void
 558 handle_1009(struct bregs *regs)
 559 {
 560     struct carattr ca = {regs->al, regs->bl, 1};
 561     write_chars(regs->bh, ca, regs->cx);
 562 }
 563
 564 static void
 565 handle_100a(struct bregs *regs)
 566 {
 567     struct carattr ca = {regs->al, regs->bl, 0};
 568     write_chars(regs->bh, ca, regs->cx);
 569 }
 570
 571
 572 static void
 573 handle_100b00(struct bregs *regs)
 574 {
 575     vgahw_set_border_color(regs->bl);
 576 }
 577
 578 static void
 579 handle_100b01(struct bregs *regs)
 580 {
 581     vgahw_set_palette(regs->bl);
 582 }
 583
 584 static void
 585 handle_100bXX(struct bregs *regs)
 586 {
 587     debug_stub(regs);
 588 }
 589
 590 static void
 591 handle_100b(struct bregs *regs)
 592 {
 593     switch (regs->bh) {
 594     case 0x00: handle_100b00(regs); break;
 595     case 0x01: handle_100b01(regs); break;
 596     default:   handle_100bXX(regs); break;
 597     }
 598 }
 599
 600
 601 static void
 602 handle_100c(struct bregs *regs)
 603 {
 604     // XXX - page (regs->bh) is unused
 605     vgafb_write_pixel(regs->al, regs->cx, regs->dx);
 606 }
 607
 608 static void
 609 handle_100d(struct bregs *regs)
 610 {
 611     // XXX - page (regs->bh) is unused
 612     regs->al = vgafb_read_pixel(regs->cx, regs->dx);
 613 }
 614
 615 static void noinline
 616 handle_100e(struct bregs *regs)
 617 {
 618     // Ralf Brown Interrupt list is WRONG on bh(page)
 619     // We do output only on the current page !
 620     struct carattr ca = {regs->al, regs->bl, 0};
 621     struct cursorpos cp = get_cursor_pos(0xff);
 622     write_teletype(&cp, ca);
 623     set_cursor_pos(cp);
 624 }
 625
 626 static void
 627 handle_100f(struct bregs *regs)
 628 {
 629     regs->bh = GET_BDA(video_page);
 630     regs->al = GET_BDA(video_mode) | (GET_BDA(video_ctl) & 0x80);
 631     regs->ah = GET_BDA(video_cols);
 632 }
 633
 634
 635 static void
 636 handle_101000(struct bregs *regs)
 637 {
 638     if (regs->bl > 0x14)
 639         return;
 640     vgahw_set_single_palette_reg(regs->bl, regs->bh);
 641 }
 642
 643 static void
 644 handle_101001(struct bregs *regs)
 645 {
 646     vgahw_set_overscan_border_color(regs->bh);
 647 }
 648
 649 static void
 650 handle_101002(struct bregs *regs)
 651 {
 652     vgahw_set_all_palette_reg(regs->es, (u8*)(regs->dx + 0));
 653 }
 654
 655 static void
 656 handle_101003(struct bregs *regs)
 657 {
 658     vgahw_toggle_intensity(regs->bl);
 659 }
 660
 661 static void
 662 handle_101007(struct bregs *regs)
 663 {
 664     if (regs->bl > 0x14)
 665         return;
 666     regs->bh = vgahw_get_single_palette_reg(regs->bl);
 667 }
 668
 669 static void
 670 handle_101008(struct bregs *regs)
 671 {
 672     regs->bh = vgahw_get_overscan_border_color();
 673 }
 674
 675 static void
 676 handle_101009(struct bregs *regs)
 677 {
 678     vgahw_get_all_palette_reg(regs->es, (u8*)(regs->dx + 0));
 679 }
 680
 681 static void noinline
 682 handle_101010(struct bregs *regs)
 683 {
 684     u8 rgb[3] = {regs->dh, regs->ch, regs->cl};
 685     vgahw_set_dac_regs(GET_SEG(SS), rgb, regs->bx, 1);
 686 }
 687
 688 static void
 689 handle_101012(struct bregs *regs)
 690 {
 691     vgahw_set_dac_regs(regs->es, (u8*)(regs->dx + 0), regs->bx, regs->cx);
 692 }
 693
 694 static void
 695 handle_101013(struct bregs *regs)
 696 {
 697     vgahw_select_video_dac_color_page(regs->bl, regs->bh);
 698 }
 699
 700 static void noinline
 701 handle_101015(struct bregs *regs)
 702 {
 703     u8 rgb[3];
 704     vgahw_get_dac_regs(GET_SEG(SS), rgb, regs->bx, 1);
 705     regs->dh = rgb[0];
 706     regs->ch = rgb[1];
 707     regs->cl = rgb[2];
 708 }
 709
 710 static void
 711 handle_101017(struct bregs *regs)
 712 {
 713     vgahw_get_dac_regs(regs->es, (u8*)(regs->dx + 0), regs->bx, regs->cx);
 714 }
 715
 716 static void
 717 handle_101018(struct bregs *regs)
 718 {
 719     vgahw_set_pel_mask(regs->bl);
 720 }
 721
 722 static void
 723 handle_101019(struct bregs *regs)
 724 {
 725     regs->bl = vgahw_get_pel_mask();
 726 }
 727
 728 static void
 729 handle_10101a(struct bregs *regs)
 730 {
 731     vgahw_read_video_dac_state(&regs->bl, &regs->bh);
 732 }
 733
 734 static void
 735 handle_10101b(struct bregs *regs)
 736 {
 737     perform_gray_scale_summing(regs->bx, regs->cx);
 738 }
 739
 740 static void
 741 handle_1010XX(struct bregs *regs)
 742 {
 743     debug_stub(regs);
 744 }
 745
 746 static void
 747 handle_1010(struct bregs *regs)
 748 {
 749     switch (regs->al) {
 750     case 0x00: handle_101000(regs); break;
 751     case 0x01: handle_101001(regs); break;
 752     case 0x02: handle_101002(regs); break;
 753     case 0x03: handle_101003(regs); break;
 754     case 0x07: handle_101007(regs); break;
 755     case 0x08: handle_101008(regs); break;
 756     case 0x09: handle_101009(regs); break;
 757     case 0x10: handle_101010(regs); break;
 758     case 0x12: handle_101012(regs); break;
 759     case 0x13: handle_101013(regs); break;
 760     case 0x15: handle_101015(regs); break;
 761     case 0x17: handle_101017(regs); break;
 762     case 0x18: handle_101018(regs); break;
 763     case 0x19: handle_101019(regs); break;
 764     case 0x1a: handle_10101a(regs); break;
 765     case 0x1b: handle_10101b(regs); break;
 766     default:   handle_1010XX(regs); break;
 767     }
 768 }
 769
 770
 771 static void
 772 handle_101100(struct bregs *regs)
 773 {
 774     vgafb_load_font(regs->es, (void*)(regs->bp+0), regs->cx
 775                     , regs->dx, regs->bl, regs->bh);
 776 }
 777
 778 static void
 779 handle_101101(struct bregs *regs)
 780 {
 781     vgafb_load_font(get_global_seg(), vgafont14, 0x100, 0, regs->bl, 14);
 782 }
 783
 784 static void
 785 handle_101102(struct bregs *regs)
 786 {
 787     vgafb_load_font(get_global_seg(), vgafont8, 0x100, 0, regs->bl, 8);
 788 }
 789
 790 static void
 791 handle_101103(struct bregs *regs)
 792 {
 793     vgahw_set_text_block_specifier(regs->bl);
 794 }
 795
 796 static void
 797 handle_101104(struct bregs *regs)
 798 {
 799     vgafb_load_font(get_global_seg(), vgafont16, 0x100, 0, regs->bl, 16);
 800 }
 801
 802 static void
 803 handle_101110(struct bregs *regs)
 804 {
 805     vgafb_load_font(regs->es, (void*)(regs->bp+0), regs->cx
 806                     , regs->dx, regs->bl, regs->bh);
 807     set_scan_lines(regs->bh);
 808 }
 809
 810 static void
 811 handle_101111(struct bregs *regs)
 812 {
 813     vgafb_load_font(get_global_seg(), vgafont14, 0x100, 0, regs->bl, 14);
 814     set_scan_lines(14);
 815 }
 816
 817 static void
 818 handle_101112(struct bregs *regs)
 819 {
 820     vgafb_load_font(get_global_seg(), vgafont8, 0x100, 0, regs->bl, 8);
 821     set_scan_lines(8);
 822 }
 823
 824 static void
 825 handle_101114(struct bregs *regs)
 826 {
 827     vgafb_load_font(get_global_seg(), vgafont16, 0x100, 0, regs->bl, 16);
 828     set_scan_lines(16);
 829 }
 830
 831 static void
 832 handle_101130(struct bregs *regs)
 833 {
 834     switch (regs->bh) {
 835     case 0x00: {
 836         struct segoff_s so = GET_IVT(0x1f);
 837         regs->es = so.seg;
 838         regs->bp = so.offset;
 839         break;
 840     }
 841     case 0x01: {
 842         struct segoff_s so = GET_IVT(0x43);
 843         regs->es = so.seg;
 844         regs->bp = so.offset;
 845         break;
 846     }
 847     case 0x02:
 848         regs->es = get_global_seg();
 849         regs->bp = (u32)vgafont14;
 850         break;
 851     case 0x03:
 852         regs->es = get_global_seg();
 853         regs->bp = (u32)vgafont8;
 854         break;
 855     case 0x04:
 856         regs->es = get_global_seg();
 857         regs->bp = (u32)vgafont8 + 128 * 8;
 858         break;
 859     case 0x05:
 860         regs->es = get_global_seg();
 861         regs->bp = (u32)vgafont14alt;
 862         break;
 863     case 0x06:
 864         regs->es = get_global_seg();
 865         regs->bp = (u32)vgafont16;
 866         break;
 867     case 0x07:
 868         regs->es = get_global_seg();
 869         regs->bp = (u32)vgafont16alt;
 870         break;
 871     default:
 872         dprintf(1, "Get font info BH(%02x) was discarded\n", regs->bh);
 873         return;
 874     }
 875     // Set byte/char of on screen font
 876     regs->cx = GET_BDA(char_height) & 0xff;
 877
 878     // Set Highest char row
 879     regs->dx = GET_BDA(video_rows);
 880 }
 881
 882 static void
 883 handle_1011XX(struct bregs *regs)
 884 {
 885     debug_stub(regs);
 886 }
 887
 888 static void
 889 handle_1011(struct bregs *regs)
 890 {
 891     switch (regs->al) {
 892     case 0x00: handle_101100(regs); break;
 893     case 0x01: handle_101101(regs); break;
 894     case 0x02: handle_101102(regs); break;
 895     case 0x03: handle_101103(regs); break;
 896     case 0x04: handle_101104(regs); break;
 897     case 0x10: handle_101110(regs); break;
 898     case 0x11: handle_101111(regs); break;
 899     case 0x12: handle_101112(regs); break;
 900     case 0x14: handle_101114(regs); break;
 901     case 0x30: handle_101130(regs); break;
 902     default:   handle_1011XX(regs); break;
 903     }
 904 }
 905
 906
 907 static void
 908 handle_101210(struct bregs *regs)
 909 {
 910     u16 crtc_addr = GET_BDA(crtc_address);
 911     if (crtc_addr == VGAREG_MDA_CRTC_ADDRESS)
 912         regs->bx = 0x0103;
 913     else
 914         regs->bx = 0x0003;
 915     regs->cx = GET_BDA(video_switches) & 0x0f;
 916 }
 917
 918 static void
 919 handle_101230(struct bregs *regs)
 920 {
 921     u8 mctl = GET_BDA(modeset_ctl);
 922     u8 vswt = GET_BDA(video_switches);
 923     switch (regs->al) {
 924     case 0x00:
 925         // 200 lines
 926         mctl = (mctl & ~0x10) | 0x80;
 927         vswt = (vswt & ~0x0f) | 0x08;
 928         break;
 929     case 0x01:
 930         // 350 lines
 931         mctl &= ~0x90;
 932         vswt = (vswt & ~0x0f) | 0x09;
 933         break;
 934     case 0x02:
 935         // 400 lines
 936         mctl = (mctl & ~0x80) | 0x10;
 937         vswt = (vswt & ~0x0f) | 0x09;
 938         break;
 939     default:
 940         dprintf(1, "Select vert res (%02x) was discarded\n", regs->al);
 941         break;
 942     }
 943     SET_BDA(modeset_ctl, mctl);
 944     SET_BDA(video_switches, vswt);
 945     regs->al = 0x12;
 946 }
 947
 948 static void
 949 handle_101231(struct bregs *regs)
 950 {
 951     u8 v = (regs->al & 0x01) << 3;
 952     u8 mctl = GET_BDA(video_ctl) & ~0x08;
 953     SET_BDA(video_ctl, mctl | v);
 954     regs->al = 0x12;
 955 }
 956
 957 static void
 958 handle_101232(struct bregs *regs)
 959 {
 960     vgahw_enable_video_addressing(regs->al);
 961     regs->al = 0x12;
 962 }
 963
 964 static void
 965 handle_101233(struct bregs *regs)
 966 {
 967     u8 v = ((regs->al << 1) & 0x02) ^ 0x02;
 968     u8 v2 = GET_BDA(modeset_ctl) & ~0x02;
 969     SET_BDA(modeset_ctl, v | v2);
 970     regs->al = 0x12;
 971 }
 972
 973 static void
 974 handle_101234(struct bregs *regs)
 975 {
 976     u8 v = (regs->al & 0x01) ^ 0x01;
 977     u8 v2 = GET_BDA(modeset_ctl) & ~0x01;
 978     SET_BDA(modeset_ctl, v | v2);
 979     regs->al = 0x12;
 980 }
 981
 982 static void
 983 handle_101235(struct bregs *regs)
 984 {
 985     debug_stub(regs);
 986     regs->al = 0x12;
 987 }
 988
 989 static void
 990 handle_101236(struct bregs *regs)
 991 {
 992     debug_stub(regs);
 993     regs->al = 0x12;
 994 }
 995
 996 static void
 997 handle_1012XX(struct bregs *regs)
 998 {
 999     debug_stub(regs);
1000 }
1001
1002 static void
1003 handle_1012(struct bregs *regs)
1004 {
1005     switch (regs->bl) {
1006     case 0x10: handle_101210(regs); break;
1007     case 0x30: handle_101230(regs); break;
1008     case 0x31: handle_101231(regs); break;
1009     case 0x32: handle_101232(regs); break;
1010     case 0x33: handle_101233(regs); break;
1011     case 0x34: handle_101234(regs); break;
1012     case 0x35: handle_101235(regs); break;
1013     case 0x36: handle_101236(regs); break;
1014     default:   handle_1012XX(regs); break;
1015     }
1016
1017     // XXX - cirrus has 1280, 1281, 1282, 1285, 129a, 12a0, 12a1, 12a2, 12ae
1018 }
1019
1020
1021 // Write string
1022 static void noinline
1023 handle_1013(struct bregs *regs)
1024 {
1025     struct cursorpos cp = {regs->dl, regs->dh, regs->bh};
1026     // if row=0xff special case : use current cursor position
1027     if (cp.y == 0xff)
1028         cp = get_cursor_pos(cp.page);
1029     u8 flag = regs->al;
1030     if (flag & 2)
1031         write_attr_string(&cp, regs->cx, regs->es, (void*)(regs->bp + 0));
1032     else
1033         write_string(&cp, regs->bl, regs->cx, regs->es, (void*)(regs->bp + 0));
1034
1035     if (flag & 1)
1036         set_cursor_pos(cp);
1037 }
1038
1039
1040 static void
1041 handle_101a00(struct bregs *regs)
1042 {
1043     regs->bx = GET_BDA(dcc_index);
1044     regs->al = 0x1a;
1045 }
1046
1047 static void
1048 handle_101a01(struct bregs *regs)
1049 {
1050     SET_BDA(dcc_index, regs->bl);
1051     dprintf(1, "Alternate Display code (%02x) was discarded\n", regs->bh);
1052     regs->al = 0x1a;
1053 }
1054
1055 static void
1056 handle_101aXX(struct bregs *regs)
1057 {
1058     debug_stub(regs);
1059 }
1060
1061 static void
1062 handle_101a(struct bregs *regs)
1063 {
1064     switch (regs->al) {
1065     case 0x00: handle_101a00(regs); break;
1066     case 0x01: handle_101a01(regs); break;
1067     default:   handle_101aXX(regs); break;
1068     }
1069 }
1070
1071
1072 struct funcInfo {
1073     u16 static_functionality_off;
1074     u16 static_functionality_seg;
1075     u8 bda_0x49[30];
1076     u8 bda_0x84[3];
1077     u8 dcc_index;
1078     u8 dcc_alt;
1079     u16 colors;
1080     u8 pages;
1081     u8 scan_lines;
1082     u8 primary_char;
1083     u8 secondar_char;
1084     u8 misc;
1085     u8 non_vga_mode;
1086     u8 reserved_2f[2];
1087     u8 video_mem;
1088     u8 save_flags;
1089     u8 disp_info;
1090     u8 reserved_34[12];
1091 };
1092
1093 static void
1094 handle_101b(struct bregs *regs)
1095 {
1096     u16 seg = regs->es;
1097     struct funcInfo *info = (void*)(regs->di+0);
1098     memset_far(seg, info, 0, sizeof(*info));
1099     // Address of static functionality table
1100     SET_FARVAR(seg, info->static_functionality_off, (u32)static_functionality);
1101     SET_FARVAR(seg, info->static_functionality_seg, get_global_seg());
1102
1103     // Hard coded copy from BIOS area. Should it be cleaner ?
1104     memcpy_far(seg, info->bda_0x49, SEG_BDA, (void*)0x49
1105                , sizeof(info->bda_0x49));
1106     memcpy_far(seg, info->bda_0x84, SEG_BDA, (void*)0x84
1107                , sizeof(info->bda_0x84));
1108
1109     SET_FARVAR(seg, info->dcc_index, GET_BDA(dcc_index));
1110     SET_FARVAR(seg, info->colors, 16);
1111     SET_FARVAR(seg, info->pages, 8);
1112     SET_FARVAR(seg, info->scan_lines, 2);
1113     SET_FARVAR(seg, info->video_mem, 3);
1114     regs->al = 0x1B;
1115 }
1116
1117
1118 static void
1119 handle_101c00(struct bregs *regs)
1120 {
1121     u16 flags = regs->cx;
1122     u16 size = 0;
1123     if (flags & 1)
1124         size += sizeof(struct saveVideoHardware);
1125     if (flags & 2)
1126         size += sizeof(struct saveBDAstate);
1127     if (flags & 4)
1128         size += sizeof(struct saveDACcolors);
1129     regs->bx = size;
1130     regs->al = 0x1c;
1131 }
1132
1133 static void
1134 handle_101c01(struct bregs *regs)
1135 {
1136     u16 flags = regs->cx;
1137     u16 seg = regs->es;
1138     void *data = (void*)(regs->bx+0);
1139     if (flags & 1) {
1140         vgahw_save_state(seg, data);
1141         data += sizeof(struct saveVideoHardware);
1142     }
1143     if (flags & 2) {
1144         save_bda_state(seg, data);
1145         data += sizeof(struct saveBDAstate);
1146     }
1147     if (flags & 4)
1148         vgahw_save_dac_state(seg, data);
1149     regs->al = 0x1c;
1150 }
1151
1152 static void
1153 handle_101c02(struct bregs *regs)
1154 {
1155     u16 flags = regs->cx;
1156     u16 seg = regs->es;
1157     void *data = (void*)(regs->bx+0);
1158     if (flags & 1) {
1159         vgahw_restore_state(seg, data);
1160         data += sizeof(struct saveVideoHardware);
1161     }
1162     if (flags & 2) {
1163         restore_bda_state(seg, data);
1164         data += sizeof(struct saveBDAstate);
1165     }
1166     if (flags & 4)
1167         vgahw_restore_dac_state(seg, data);
1168     regs->al = 0x1c;
1169 }
1170
1171 static void
1172 handle_101cXX(struct bregs *regs)
1173 {
1174     debug_stub(regs);
1175 }
1176
1177 static void
1178 handle_101c(struct bregs *regs)
1179 {
1180     switch (regs->al) {
1181     case 0x00: handle_101c00(regs); break;
1182     case 0x01: handle_101c01(regs); break;
1183     case 0x02: handle_101c02(regs); break;
1184     default:   handle_101cXX(regs); break;
1185     }
1186 }
1187
1188
1189 static void
1190 handle_104f00(struct bregs *regs)
1191 {
1192     // XXX - vbe_biosfn_return_controller_information(&AX,ES,DI);
1193     // XXX - OR cirrus_vesa_00h
1194 }
1195
1196 static void
1197 handle_104f01(struct bregs *regs)
1198 {
1199     // XXX - vbe_biosfn_return_mode_information(&AX,CX,ES,DI);
1200     // XXX - OR cirrus_vesa_01h
1201 }
1202
1203 static void
1204 handle_104f02(struct bregs *regs)
1205 {
1206     // XXX - vbe_biosfn_set_mode(&AX,BX,ES,DI);
1207     // XXX - OR cirrus_vesa_02h
1208 }
1209
1210 static void
1211 handle_104f03(struct bregs *regs)
1212 {
1213     // XXX - vbe_biosfn_return_current_mode
1214     // XXX - OR cirrus_vesa_03h
1215 }
1216
1217 static void
1218 handle_104f04(struct bregs *regs)
1219 {
1220     // XXX - vbe_biosfn_save_restore_state(&AX, CX, DX, ES, &BX);
1221 }
1222
1223 static void
1224 handle_104f05(struct bregs *regs)
1225 {
1226     // XXX - vbe_biosfn_display_window_control
1227     // XXX - OR cirrus_vesa_05h
1228 }
1229
1230 static void
1231 handle_104f06(struct bregs *regs)
1232 {
1233     // XXX - vbe_biosfn_set_get_logical_scan_line_length
1234     // XXX - OR cirrus_vesa_06h
1235 }
1236
1237 static void
1238 handle_104f07(struct bregs *regs)
1239 {
1240     // XXX - vbe_biosfn_set_get_display_start
1241     // XXX - OR cirrus_vesa_07h
1242 }
1243
1244 static void
1245 handle_104f08(struct bregs *regs)
1246 {
1247     // XXX - vbe_biosfn_set_get_dac_palette_format
1248 }
1249
1250 static void
1251 handle_104f0a(struct bregs *regs)
1252 {
1253     // XXX - vbe_biosfn_return_protected_mode_interface
1254 }
1255
1256 static void
1257 handle_104fXX(struct bregs *regs)
1258 {
1259     debug_stub(regs);
1260     regs->ax = 0x0100;
1261 }
1262
1263 static void
1264 handle_104f(struct bregs *regs)
1265 {
1266     if (! CONFIG_VBE || !vbe_has_vbe_display()) {
1267         handle_104fXX(regs);
1268         return;
1269     }
1270
1271     switch (regs->al) {
1272     case 0x00: handle_104f00(regs); break;
1273     case 0x01: handle_104f01(regs); break;
1274     case 0x02: handle_104f02(regs); break;
1275     case 0x03: handle_104f03(regs); break;
1276     case 0x04: handle_104f04(regs); break;
1277     case 0x05: handle_104f05(regs); break;
1278     case 0x06: handle_104f06(regs); break;
1279     case 0x07: handle_104f07(regs); break;
1280     case 0x08: handle_104f08(regs); break;
1281     case 0x0a: handle_104f0a(regs); break;
1282     default:   handle_104fXX(regs); break;
1283     }
1284 }
1285
1286
1287 static void
1288 handle_10XX(struct bregs *regs)
1289 {
1290     debug_stub(regs);
1291 }
1292
1293 // INT 10h Video Support Service Entry Point
1294 void VISIBLE16
1295 handle_10(struct bregs *regs)
1296 {
1297     debug_enter(regs, DEBUG_VGA_10);
1298     switch (regs->ah) {
1299     case 0x00: handle_1000(regs); break;
1300     case 0x01: handle_1001(regs); break;
1301     case 0x02: handle_1002(regs); break;
1302     case 0x03: handle_1003(regs); break;
1303     case 0x04: handle_1004(regs); break;
1304     case 0x05: handle_1005(regs); break;
1305     case 0x06: handle_1006(regs); break;
1306     case 0x07: handle_1007(regs); break;
1307     case 0x08: handle_1008(regs); break;
1308     case 0x09: handle_1009(regs); break;
1309     case 0x0a: handle_100a(regs); break;
1310     case 0x0b: handle_100b(regs); break;
1311     case 0x0c: handle_100c(regs); break;
1312     case 0x0d: handle_100d(regs); break;
1313     case 0x0e: handle_100e(regs); break;
1314     case 0x0f: handle_100f(regs); break;
1315     case 0x10: handle_1010(regs); break;
1316     case 0x11: handle_1011(regs); break;
1317     case 0x12: handle_1012(regs); break;
1318     case 0x13: handle_1013(regs); break;
1319     case 0x1a: handle_101a(regs); break;
1320     case 0x1b: handle_101b(regs); break;
1321     case 0x1c: handle_101c(regs); break;
1322     case 0x4f: handle_104f(regs); break;
1323     default:   handle_10XX(regs); break;
1324     }
1325 }
1326
1327
1328 /****************************************************************
1329  * VGA post
1330  ****************************************************************/
1331
1332 static void
1333 init_bios_area(void)
1334 {
1335     // init detected hardware BIOS Area
1336     // set 80x25 color (not clear from RBIL but usual)
1337     u16 eqf = GET_BDA(equipment_list_flags);
1338     SET_BDA(equipment_list_flags, (eqf & 0xffcf) | 0x20);
1339
1340     // Just for the first int10 find its children
1341
1342     // the default char height
1343     SET_BDA(char_height, 0x10);
1344
1345     // Clear the screen
1346     SET_BDA(video_ctl, 0x60);
1347
1348     // Set the basic screen we have
1349     SET_BDA(video_switches, 0xf9);
1350
1351     // Set the basic modeset options
1352     SET_BDA(modeset_ctl, 0x51);
1353
1354     // Set the  default MSR
1355     SET_BDA(video_msr, 0x09);
1356 }
1357
1358 void VISIBLE16
1359 vga_post(struct bregs *regs)
1360 {
1361     debug_enter(regs, DEBUG_VGA_POST);
1362
1363     vgahw_init();
1364
1365     init_bios_area();
1366
1367     if (CONFIG_VBE)
1368         vbe_init();
1369
1370     extern void entry_10(void);
1371     SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10));
1372
1373     if (CONFIG_CIRRUS)
1374         cirrus_init();
1375
1376     // XXX - clear screen and display info
1377
1378     // XXX: fill it
1379     SET_VGA(video_save_pointer_table[0], (u32)video_param_table);
1380     SET_VGA(video_save_pointer_table[1], get_global_seg());
1381
1382     // Fixup checksum
1383     extern u8 _rom_header_size, _rom_header_checksum;
1384     SET_VGA(_rom_header_checksum, 0);
1385     u8 sum = -checksum_far(get_global_seg(), 0, _rom_header_size * 512);
1386     SET_VGA(_rom_header_checksum, sum);
1387 }