vgasrc/clext.c

   1 //  QEMU Cirrus CLGD 54xx VGABIOS Extension.
   2 //
   3 // Copyright (C) 2009  Kevin O'Connor <kevin@koconnor.net>
   4 //  Copyright (c) 2004 Makoto Suzuki (suzu)
   5 //
   6 // This file may be distributed under the terms of the GNU LGPLv3 license.
   7
   8 #include "vgabios.h" // cirrus_init
   9 #include "biosvar.h" // GET_GLOBAL
  10 #include "util.h" // dprintf
  11 #include "bregs.h" // struct bregs
  12 #include "vbe.h" // struct vbe_info
  13 #include "stdvga.h" // VGAREG_SEQU_ADDRESS
  14
  15
  16 /****************************************************************
  17  * tables
  18  ****************************************************************/
  19
  20 struct cirrus_mode_s {
  21     /* + 0 */
  22     u16 mode;
  23     u16 width;
  24     u16 height;
  25     u16 depth;
  26     /* + 8 */
  27     u16 hidden_dac; /* 0x3c6 */
  28     u16 *seq; /* 0x3c4 */
  29     u16 *graph; /* 0x3ce */
  30     u16 *crtc; /* 0x3d4 */
  31     /* +16 */
  32     u8 bitsperpixel;
  33     u8 vesacolortype;
  34     u8 vesaredmask;
  35     u8 vesaredpos;
  36     u8 vesagreenmask;
  37     u8 vesagreenpos;
  38     u8 vesabluemask;
  39     u8 vesabluepos;
  40     /* +24 */
  41     u8 vesareservedmask;
  42     u8 vesareservedpos;
  43 };
  44
  45 /* VGA */
  46 static u16 cseq_vga[] VAR16 = {0x0007,0xffff};
  47 static u16 cgraph_vga[] VAR16 = {0x0009,0x000a,0x000b,0xffff};
  48 static u16 ccrtc_vga[] VAR16 = {0x001a,0x001b,0x001d,0xffff};
  49
  50 /* extensions */
  51 static u16 cgraph_svgacolor[] VAR16 = {
  52     0x0000,0x0001,0x0002,0x0003,0x0004,0x4005,0x0506,0x0f07,0xff08,
  53     0x0009,0x000a,0x000b,
  54     0xffff
  55 };
  56 /* 640x480x8 */
  57 static u16 cseq_640x480x8[] VAR16 = {
  58     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
  59     0x580b,0x580c,0x580d,0x580e,
  60     0x0412,0x0013,0x2017,
  61     0x331b,0x331c,0x331d,0x331e,
  62     0xffff
  63 };
  64 static u16 ccrtc_640x480x8[] VAR16 = {
  65     0x2c11,
  66     0x5f00,0x4f01,0x4f02,0x8003,0x5204,0x1e05,0x0b06,0x3e07,
  67     0x4009,0x000c,0x000d,
  68     0xea10,0xdf12,0x5013,0x4014,0xdf15,0x0b16,0xc317,0xff18,
  69     0x001a,0x221b,0x001d,
  70     0xffff
  71 };
  72 /* 640x480x16 */
  73 static u16 cseq_640x480x16[] VAR16 = {
  74     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
  75     0x580b,0x580c,0x580d,0x580e,
  76     0x0412,0x0013,0x2017,
  77     0x331b,0x331c,0x331d,0x331e,
  78     0xffff
  79 };
  80 static u16 ccrtc_640x480x16[] VAR16 = {
  81     0x2c11,
  82     0x5f00,0x4f01,0x4f02,0x8003,0x5204,0x1e05,0x0b06,0x3e07,
  83     0x4009,0x000c,0x000d,
  84     0xea10,0xdf12,0xa013,0x4014,0xdf15,0x0b16,0xc317,0xff18,
  85     0x001a,0x221b,0x001d,
  86     0xffff
  87 };
  88 /* 640x480x24 */
  89 static u16 cseq_640x480x24[] VAR16 = {
  90     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1507,
  91     0x580b,0x580c,0x580d,0x580e,
  92     0x0412,0x0013,0x2017,
  93     0x331b,0x331c,0x331d,0x331e,
  94     0xffff
  95 };
  96 static u16 ccrtc_640x480x24[] VAR16 = {
  97     0x2c11,
  98     0x5f00,0x4f01,0x4f02,0x8003,0x5204,0x1e05,0x0b06,0x3e07,
  99     0x4009,0x000c,0x000d,
 100     0xea10,0xdf12,0x0013,0x4014,0xdf15,0x0b16,0xc317,0xff18,
 101     0x001a,0x321b,0x001d,
 102     0xffff
 103 };
 104 /* 800x600x8 */
 105 static u16 cseq_800x600x8[] VAR16 = {
 106     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 107     0x230b,0x230c,0x230d,0x230e,
 108     0x0412,0x0013,0x2017,
 109     0x141b,0x141c,0x141d,0x141e,
 110     0xffff
 111 };
 112 static u16 ccrtc_800x600x8[] VAR16 = {
 113     0x2311,0x7d00,0x6301,0x6302,0x8003,0x6b04,0x1a05,0x9806,0xf007,
 114     0x6009,0x000c,0x000d,
 115     0x7d10,0x5712,0x6413,0x4014,0x5715,0x9816,0xc317,0xff18,
 116     0x001a,0x221b,0x001d,
 117     0xffff
 118 };
 119 /* 800x600x16 */
 120 static u16 cseq_800x600x16[] VAR16 = {
 121     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
 122     0x230b,0x230c,0x230d,0x230e,
 123     0x0412,0x0013,0x2017,
 124     0x141b,0x141c,0x141d,0x141e,
 125     0xffff
 126 };
 127 static u16 ccrtc_800x600x16[] VAR16 = {
 128     0x2311,0x7d00,0x6301,0x6302,0x8003,0x6b04,0x1a05,0x9806,0xf007,
 129     0x6009,0x000c,0x000d,
 130     0x7d10,0x5712,0xc813,0x4014,0x5715,0x9816,0xc317,0xff18,
 131     0x001a,0x221b,0x001d,
 132     0xffff
 133 };
 134 /* 800x600x24 */
 135 static u16 cseq_800x600x24[] VAR16 = {
 136     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1507,
 137     0x230b,0x230c,0x230d,0x230e,
 138     0x0412,0x0013,0x2017,
 139     0x141b,0x141c,0x141d,0x141e,
 140     0xffff
 141 };
 142 static u16 ccrtc_800x600x24[] VAR16 = {
 143     0x2311,0x7d00,0x6301,0x6302,0x8003,0x6b04,0x1a05,0x9806,0xf007,
 144     0x6009,0x000c,0x000d,
 145     0x7d10,0x5712,0x2c13,0x4014,0x5715,0x9816,0xc317,0xff18,
 146     0x001a,0x321b,0x001d,
 147     0xffff
 148 };
 149 /* 1024x768x8 */
 150 static u16 cseq_1024x768x8[] VAR16 = {
 151     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 152     0x760b,0x760c,0x760d,0x760e,
 153     0x0412,0x0013,0x2017,
 154     0x341b,0x341c,0x341d,0x341e,
 155     0xffff
 156 };
 157 static u16 ccrtc_1024x768x8[] VAR16 = {
 158     0x2911,0xa300,0x7f01,0x7f02,0x8603,0x8304,0x9405,0x2406,0xf507,
 159     0x6009,0x000c,0x000d,
 160     0x0310,0xff12,0x8013,0x4014,0xff15,0x2416,0xc317,0xff18,
 161     0x001a,0x221b,0x001d,
 162     0xffff
 163 };
 164 /* 1024x768x16 */
 165 static u16 cseq_1024x768x16[] VAR16 = {
 166     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
 167     0x760b,0x760c,0x760d,0x760e,
 168     0x0412,0x0013,0x2017,
 169     0x341b,0x341c,0x341d,0x341e,
 170     0xffff
 171 };
 172 static u16 ccrtc_1024x768x16[] VAR16 = {
 173     0x2911,0xa300,0x7f01,0x7f02,0x8603,0x8304,0x9405,0x2406,0xf507,
 174     0x6009,0x000c,0x000d,
 175     0x0310,0xff12,0x0013,0x4014,0xff15,0x2416,0xc317,0xff18,
 176     0x001a,0x321b,0x001d,
 177     0xffff
 178 };
 179 /* 1024x768x24 */
 180 static u16 cseq_1024x768x24[] VAR16 = {
 181     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1507,
 182     0x760b,0x760c,0x760d,0x760e,
 183     0x0412,0x0013,0x2017,
 184     0x341b,0x341c,0x341d,0x341e,
 185     0xffff
 186 };
 187 static u16 ccrtc_1024x768x24[] VAR16 = {
 188     0x2911,0xa300,0x7f01,0x7f02,0x8603,0x8304,0x9405,0x2406,0xf507,
 189     0x6009,0x000c,0x000d,
 190     0x0310,0xff12,0x8013,0x4014,0xff15,0x2416,0xc317,0xff18,
 191     0x001a,0x321b,0x001d,
 192     0xffff
 193 };
 194 /* 1280x1024x8 */
 195 static u16 cseq_1280x1024x8[] VAR16 = {
 196     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 197     0x760b,0x760c,0x760d,0x760e,
 198     0x0412,0x0013,0x2017,
 199     0x341b,0x341c,0x341d,0x341e,
 200     0xffff
 201 };
 202 static u16 ccrtc_1280x1024x8[] VAR16 = {
 203     0x2911,0xc300,0x9f01,0x9f02,0x8603,0x8304,0x9405,0x2406,0xf707,
 204     0x6009,0x000c,0x000d,
 205     0x0310,0xff12,0xa013,0x4014,0xff15,0x2416,0xc317,0xff18,
 206     0x001a,0x221b,0x001d,
 207     0xffff
 208 };
 209 /* 1280x1024x16 */
 210 static u16 cseq_1280x1024x16[] VAR16 = {
 211     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1707,
 212     0x760b,0x760c,0x760d,0x760e,
 213     0x0412,0x0013,0x2017,
 214     0x341b,0x341c,0x341d,0x341e,
 215     0xffff
 216 };
 217 static u16 ccrtc_1280x1024x16[] VAR16 = {
 218     0x2911,0xc300,0x9f01,0x9f02,0x8603,0x8304,0x9405,0x2406,0xf707,
 219     0x6009,0x000c,0x000d,
 220     0x0310,0xff12,0x4013,0x4014,0xff15,0x2416,0xc317,0xff18,
 221     0x001a,0x321b,0x001d,
 222     0xffff
 223 };
 224
 225 /* 1600x1200x8 */
 226 static u16 cseq_1600x1200x8[] VAR16 = {
 227     0x0300,0x2101,0x0f02,0x0003,0x0e04,0x1107,
 228     0x760b,0x760c,0x760d,0x760e,
 229     0x0412,0x0013,0x2017,
 230     0x341b,0x341c,0x341d,0x341e,
 231     0xffff
 232 };
 233 static u16 ccrtc_1600x1200x8[] VAR16 = {
 234     0x2911,0xc300,0x9f01,0x9f02,0x8603,0x8304,0x9405,0x2406,0xf707,
 235     0x6009,0x000c,0x000d,
 236     0x0310,0xff12,0xa013,0x4014,0xff15,0x2416,0xc317,0xff18,
 237     0x001a,0x221b,0x001d,
 238     0xffff
 239 };
 240
 241 static struct cirrus_mode_s cirrus_modes[] VAR16 = {
 242     {0x5f,640,480,8,0x00,
 243      cseq_640x480x8,cgraph_svgacolor,ccrtc_640x480x8,8,
 244      4,0,0,0,0,0,0,0,0},
 245     {0x64,640,480,16,0xe1,
 246      cseq_640x480x16,cgraph_svgacolor,ccrtc_640x480x16,16,
 247      6,5,11,6,5,5,0,0,0},
 248     {0x66,640,480,15,0xf0,
 249      cseq_640x480x16,cgraph_svgacolor,ccrtc_640x480x16,16,
 250      6,5,10,5,5,5,0,1,15},
 251     {0x71,640,480,24,0xe5,
 252      cseq_640x480x24,cgraph_svgacolor,ccrtc_640x480x24,24,
 253      6,8,16,8,8,8,0,0,0},
 254
 255     {0x5c,800,600,8,0x00,
 256      cseq_800x600x8,cgraph_svgacolor,ccrtc_800x600x8,8,
 257      4,0,0,0,0,0,0,0,0},
 258     {0x65,800,600,16,0xe1,
 259      cseq_800x600x16,cgraph_svgacolor,ccrtc_800x600x16,16,
 260      6,5,11,6,5,5,0,0,0},
 261     {0x67,800,600,15,0xf0,
 262      cseq_800x600x16,cgraph_svgacolor,ccrtc_800x600x16,16,
 263      6,5,10,5,5,5,0,1,15},
 264
 265     {0x60,1024,768,8,0x00,
 266      cseq_1024x768x8,cgraph_svgacolor,ccrtc_1024x768x8,8,
 267      4,0,0,0,0,0,0,0,0},
 268     {0x74,1024,768,16,0xe1,
 269      cseq_1024x768x16,cgraph_svgacolor,ccrtc_1024x768x16,16,
 270      6,5,11,6,5,5,0,0,0},
 271     {0x68,1024,768,15,0xf0,
 272      cseq_1024x768x16,cgraph_svgacolor,ccrtc_1024x768x16,16,
 273      6,5,10,5,5,5,0,1,15},
 274
 275     {0x78,800,600,24,0xe5,
 276      cseq_800x600x24,cgraph_svgacolor,ccrtc_800x600x24,24,
 277      6,8,16,8,8,8,0,0,0},
 278     {0x79,1024,768,24,0xe5,
 279      cseq_1024x768x24,cgraph_svgacolor,ccrtc_1024x768x24,24,
 280      6,8,16,8,8,8,0,0,0},
 281
 282     {0x6d,1280,1024,8,0x00,
 283      cseq_1280x1024x8,cgraph_svgacolor,ccrtc_1280x1024x8,8,
 284      4,0,0,0,0,0,0,0,0},
 285     {0x69,1280,1024,15,0xf0,
 286      cseq_1280x1024x16,cgraph_svgacolor,ccrtc_1280x1024x16,16,
 287      6,5,10,5,5,5,0,1,15},
 288     {0x75,1280,1024,16,0xe1,
 289      cseq_1280x1024x16,cgraph_svgacolor,ccrtc_1280x1024x16,16,
 290      6,5,11,6,5,5,0,0,0},
 291
 292     {0x7b,1600,1200,8,0x00,
 293      cseq_1600x1200x8,cgraph_svgacolor,ccrtc_1600x1200x8,8,
 294      4,0,0,0,0,0,0,0,0},
 295
 296     {0xfe,0,0,0,0,cseq_vga,cgraph_vga,ccrtc_vga,0,
 297      0xff,0,0,0,0,0,0,0,0},
 298 };
 299
 300
 301 /****************************************************************
 302  * helper functions
 303  ****************************************************************/
 304
 305 static struct cirrus_mode_s *
 306 cirrus_get_modeentry(u8 mode)
 307 {
 308     struct cirrus_mode_s *table_g = cirrus_modes;
 309     while (table_g < &cirrus_modes[ARRAY_SIZE(cirrus_modes)]) {
 310         u16 tmode = GET_GLOBAL(table_g->mode);
 311         if (tmode == mode)
 312             return table_g;
 313         table_g++;
 314     }
 315     return NULL;
 316 }
 317
 318 static void
 319 cirrus_switch_mode_setregs(u16 *data, u16 port)
 320 {
 321     for (;;) {
 322         u16 val = GET_GLOBAL(*data);
 323         if (val == 0xffff)
 324             return;
 325         outw(val, port);
 326         data++;
 327     }
 328 }
 329
 330 static void
 331 cirrus_switch_mode(struct cirrus_mode_s *table)
 332 {
 333     // Unlock cirrus special
 334     outw(0x1206, VGAREG_SEQU_ADDRESS);
 335     cirrus_switch_mode_setregs(GET_GLOBAL(table->seq), VGAREG_SEQU_ADDRESS);
 336     cirrus_switch_mode_setregs(GET_GLOBAL(table->graph), VGAREG_GRDC_ADDRESS);
 337     cirrus_switch_mode_setregs(GET_GLOBAL(table->crtc), stdvga_get_crtc());
 338
 339     outb(0x00, VGAREG_PEL_MASK);
 340     inb(VGAREG_PEL_MASK);
 341     inb(VGAREG_PEL_MASK);
 342     inb(VGAREG_PEL_MASK);
 343     inb(VGAREG_PEL_MASK);
 344     outb(GET_GLOBAL(table->hidden_dac), VGAREG_PEL_MASK);
 345     outb(0xff, VGAREG_PEL_MASK);
 346
 347     u8 vesacolortype = GET_GLOBAL(table->vesacolortype);
 348     u8 v = stdvga_get_single_palette_reg(0x10) & 0xfe;
 349     if (vesacolortype == 3)
 350         v |= 0x41;
 351     else if (vesacolortype)
 352         v |= 0x01;
 353     stdvga_set_single_palette_reg(0x10, v);
 354 }
 355
 356 static u8
 357 cirrus_get_memsize(void)
 358 {
 359     // get DRAM band width
 360     outb(0x0f, VGAREG_SEQU_ADDRESS);
 361     u8 v = inb(VGAREG_SEQU_DATA);
 362     u8 x = (v >> 3) & 0x03;
 363     if (x == 0x03) {
 364         if (v & 0x80)
 365             // 4MB
 366             return 0x40;
 367         // 2MB
 368         return 0x20;
 369     }
 370     return 0x04 << x;
 371 }
 372
 373 static void
 374 cirrus_enable_16k_granularity(void)
 375 {
 376     outb(0x0b, VGAREG_GRDC_ADDRESS);
 377     u8 v = inb(VGAREG_GRDC_DATA);
 378     outb(v | 0x20, VGAREG_GRDC_DATA);
 379 }
 380
 381 static void
 382 cirrus_clear_vram(u16 param)
 383 {
 384     cirrus_enable_16k_granularity();
 385     u8 count = cirrus_get_memsize() * 4;
 386     u8 i;
 387     for (i=0; i<count; i++) {
 388         outw((i<<8) | 0x09, VGAREG_GRDC_ADDRESS);
 389         memset16_far(SEG_GRAPH, 0, param, 16 * 1024);
 390     }
 391     outw(0x0009, VGAREG_GRDC_ADDRESS);
 392 }
 393
 394 int
 395 cirrus_set_video_mode(u8 mode, u8 noclearmem)
 396 {
 397     dprintf(1, "cirrus mode %d\n", mode);
 398     SET_BDA(vbe_mode, 0);
 399     struct cirrus_mode_s *table_g = cirrus_get_modeentry(mode);
 400     if (table_g) {
 401         cirrus_switch_mode(table_g);
 402         if (!noclearmem)
 403             cirrus_clear_vram(0xffff);
 404         SET_BDA(video_mode, mode);
 405         return 1;
 406     }
 407     table_g = cirrus_get_modeentry(0xfe);
 408     cirrus_switch_mode(table_g);
 409     dprintf(1, "cirrus mode switch regular\n");
 410     return 0;
 411 }
 412
 413 static int
 414 cirrus_check(void)
 415 {
 416     outw(0x9206, VGAREG_SEQU_ADDRESS);
 417     return inb(VGAREG_SEQU_DATA) == 0x12;
 418 }
 419
 420
 421 /****************************************************************
 422  * extbios
 423  ****************************************************************/
 424
 425 static void
 426 cirrus_extbios_80h(struct bregs *regs)
 427 {
 428     u16 crtc_addr = stdvga_get_crtc();
 429     outb(0x27, crtc_addr);
 430     u8 v = inb(crtc_addr + 1);
 431     if (v == 0xa0)
 432         // 5430
 433         regs->ax = 0x0032;
 434     else if (v == 0xb8)
 435         // 5446
 436         regs->ax = 0x0039;
 437     else
 438         regs->ax = 0x00ff;
 439     regs->bx = 0x00;
 440     return;
 441 }
 442
 443 static void
 444 cirrus_extbios_81h(struct bregs *regs)
 445 {
 446     // XXX
 447     regs->ax = 0x0100;
 448 }
 449
 450 static void
 451 cirrus_extbios_82h(struct bregs *regs)
 452 {
 453     u16 crtc_addr = stdvga_get_crtc();
 454     outb(0x27, crtc_addr);
 455     regs->al = inb(crtc_addr + 1) & 0x03;
 456     regs->ah = 0xAF;
 457 }
 458
 459 static void
 460 cirrus_extbios_85h(struct bregs *regs)
 461 {
 462     regs->al = cirrus_get_memsize();
 463 }
 464
 465 static void
 466 cirrus_extbios_9Ah(struct bregs *regs)
 467 {
 468     regs->ax = 0x4060;
 469     regs->cx = 0x1132;
 470 }
 471
 472 extern void a0h_callback(void);
 473 ASM16(
 474     // fatal: not implemented yet
 475     "a0h_callback:"
 476     "cli\n"
 477     "hlt\n"
 478     "retf");
 479
 480 static void
 481 cirrus_extbios_A0h(struct bregs *regs)
 482 {
 483     struct cirrus_mode_s *table_g = cirrus_get_modeentry(regs->al & 0x7f);
 484     regs->ah = (table_g ? 1 : 0);
 485     regs->si = 0xffff;
 486     regs->di = regs->ds = regs->es = regs->bx = (u32)a0h_callback;
 487 }
 488
 489 static void
 490 cirrus_extbios_A1h(struct bregs *regs)
 491 {
 492     regs->bx = 0x0e00; // IBM 8512/8513, color
 493 }
 494
 495 static void
 496 cirrus_extbios_A2h(struct bregs *regs)
 497 {
 498     regs->al = 0x07; // HSync 31.5 - 64.0 kHz
 499 }
 500
 501 static void
 502 cirrus_extbios_AEh(struct bregs *regs)
 503 {
 504     regs->al = 0x01; // High Refresh 75Hz
 505 }
 506
 507 void
 508 cirrus_extbios(struct bregs *regs)
 509 {
 510     // XXX - regs->bl < 0x80 or > 0xaf call regular handlers.
 511     switch (regs->bl) {
 512     case 0x80: cirrus_extbios_80h(regs); break;
 513     case 0x81: cirrus_extbios_81h(regs); break;
 514     case 0x82: cirrus_extbios_82h(regs); break;
 515     case 0x85: cirrus_extbios_85h(regs); break;
 516     case 0x9a: cirrus_extbios_9Ah(regs); break;
 517     case 0xa0: cirrus_extbios_A0h(regs); break;
 518     case 0xa1: cirrus_extbios_A1h(regs); break;
 519     case 0xa2: cirrus_extbios_A2h(regs); break;
 520     case 0xae: cirrus_extbios_AEh(regs); break;
 521     default: break;
 522     }
 523 }
 524
 525
 526 /****************************************************************
 527  * vesa calls
 528  ****************************************************************/
 529
 530 static struct {
 531     u16 vesamode, mode;
 532 } cirrus_vesa_modelist[] VAR16 = {
 533     // 640x480x8
 534     { 0x101, 0x5f },
 535     // 640x480x15
 536     { 0x110, 0x66 },
 537     // 640x480x16
 538     { 0x111, 0x64 },
 539     // 640x480x24
 540     { 0x112, 0x71 },
 541     // 800x600x8
 542     { 0x103, 0x5c },
 543     // 800x600x15
 544     { 0x113, 0x67 },
 545     // 800x600x16
 546     { 0x114, 0x65 },
 547     // 800x600x24
 548     { 0x115, 0x78 },
 549     // 1024x768x8
 550     { 0x105, 0x60 },
 551     // 1024x768x15
 552     { 0x116, 0x68 },
 553     // 1024x768x16
 554     { 0x117, 0x74 },
 555     // 1024x768x24
 556     { 0x118, 0x79 },
 557     // 1280x1024x8
 558     { 0x107, 0x6d },
 559     // 1280x1024x15
 560     { 0x119, 0x69 },
 561     // 1280x1024x16
 562     { 0x11a, 0x75 },
 563 };
 564
 565 static u16
 566 cirrus_vesamode_to_mode(u16 vesamode)
 567 {
 568     int i;
 569     for (i=0; i<ARRAY_SIZE(cirrus_vesa_modelist); i++)
 570         if (GET_GLOBAL(cirrus_vesa_modelist[i].vesamode) == vesamode)
 571             return GET_GLOBAL(cirrus_vesa_modelist[i].mode);
 572     return 0;
 573 }
 574
 575 static u8
 576 cirrus_get_bpp_bytes(void)
 577 {
 578     outb(0x07, VGAREG_SEQU_ADDRESS);
 579     u8 v = inb(VGAREG_SEQU_DATA) & 0x0e;
 580     if (v == 0x06)
 581         v &= 0x02;
 582     v >>= 1;
 583     if (v != 0x04)
 584         v++;
 585     return v;
 586 }
 587
 588 static void
 589 cirrus_set_line_offset(u16 new_line_offset)
 590 {
 591     u16 crtc_addr = stdvga_get_crtc();
 592     outb(0x13, crtc_addr);
 593     outb(new_line_offset / 8, crtc_addr + 1);
 594
 595     outb(0x1b, crtc_addr);
 596     u8 v = inb(crtc_addr + 1);
 597     outb((((new_line_offset / 8) & 0x100) >> 4) | (v & 0xef), crtc_addr + 1);
 598 }
 599
 600 static u16
 601 cirrus_get_line_offset(void)
 602 {
 603     u16 crtc_addr = stdvga_get_crtc();
 604     outb(0x13, crtc_addr);
 605     u8 reg13 = inb(crtc_addr + 1);
 606     outb(0x1b, crtc_addr);
 607     u8 reg1b = inb(crtc_addr + 1);
 608
 609     return (((reg1b << 4) & 0x100) + reg13) * 8;
 610 }
 611
 612 static u16
 613 cirrus_get_line_offset_entry(struct cirrus_mode_s *table_g)
 614 {
 615     u16 *crtc = GET_GLOBAL(table_g->crtc);
 616
 617     u16 *c = crtc;
 618     u16 reg13;
 619     for (;;) {
 620         reg13 = GET_GLOBAL(*c);
 621         if ((reg13 & 0xff) == 0x13)
 622             break;
 623         c++;
 624     }
 625     reg13 >>= 8;
 626
 627     c = crtc;
 628     u16 reg1b;
 629     for (;;) {
 630         reg1b = GET_GLOBAL(*c);
 631         if ((reg1b & 0xff) == 0x1b)
 632             break;
 633         c++;
 634     }
 635     reg1b >>= 8;
 636
 637     return (((reg1b << 4) & 0x100) + reg13) * 8;
 638 }
 639
 640 static void
 641 cirrus_set_start_addr(u32 addr)
 642 {
 643     u16 crtc_addr = stdvga_get_crtc();
 644     outb(0x0d, crtc_addr);
 645     outb(addr, crtc_addr + 1);
 646
 647     outb(0x0c, crtc_addr);
 648     outb(addr>>8, crtc_addr + 1);
 649
 650     outb(0x1d, crtc_addr);
 651     u8 v = inb(crtc_addr + 1);
 652     outb(((addr & 0x0800) >> 4) | (v & 0x7f), crtc_addr + 1);
 653
 654     outb(0x1b, crtc_addr);
 655     v = inb(crtc_addr + 1);
 656     outb(((addr & 0x0100) >> 8) | ((addr & 0x0600) >> 7) | (v & 0xf2)
 657          , crtc_addr + 1);
 658 }
 659
 660 static u32
 661 cirrus_get_start_addr(void)
 662 {
 663     u16 crtc_addr = stdvga_get_crtc();
 664     outb(0x0c, crtc_addr);
 665     u8 b2 = inb(crtc_addr + 1);
 666
 667     outb(0x0d, crtc_addr);
 668     u8 b1 = inb(crtc_addr + 1);
 669
 670     outb(0x1b, crtc_addr);
 671     u8 b3 = inb(crtc_addr + 1);
 672
 673     outb(0x1d, crtc_addr);
 674     u8 b4 = inb(crtc_addr + 1);
 675
 676     return (b1 | (b2<<8) | ((b3 & 0x01) << 16) | ((b3 & 0x0c) << 15)
 677             | ((b4 & 0x80) << 12));
 678 }
 679
 680 static void
 681 cirrus_vesa_00h(struct bregs *regs)
 682 {
 683     u16 seg = regs->es;
 684     struct vbe_info *info = (void*)(regs->di+0);
 685
 686     if (GET_FARVAR(seg, info->signature) == VBE2_SIGNATURE) {
 687         SET_FARVAR(seg, info->oem_revision, 0x0100);
 688         SET_FARVAR(seg, info->oem_vendor_string,
 689                    SEGOFF(get_global_seg(), (u32)VBE_VENDOR_STRING));
 690         SET_FARVAR(seg, info->oem_product_string,
 691                    SEGOFF(get_global_seg(), (u32)VBE_PRODUCT_STRING));
 692         SET_FARVAR(seg, info->oem_revision_string,
 693                    SEGOFF(get_global_seg(), (u32)VBE_REVISION_STRING));
 694     }
 695     SET_FARVAR(seg, info->signature, VESA_SIGNATURE);
 696
 697     SET_FARVAR(seg, info->version, 0x0200);
 698
 699     SET_FARVAR(seg, info->oem_string
 700                , SEGOFF(get_global_seg(), (u32)VBE_OEM_STRING));
 701     SET_FARVAR(seg, info->capabilities, 0);
 702     SET_FARVAR(seg, info->total_memory, cirrus_get_memsize());
 703
 704     u16 *destmode = (void*)info->reserved;
 705     SET_FARVAR(seg, info->video_mode, SEGOFF(seg, (u32)destmode));
 706     int i;
 707     for (i=0; i<ARRAY_SIZE(cirrus_vesa_modelist); i++)
 708         SET_FARVAR(seg, destmode[i]
 709                    , GET_GLOBAL(cirrus_vesa_modelist[i].vesamode));
 710     SET_FARVAR(seg, destmode[i], 0xffff);
 711
 712     regs->ax = 0x004f;
 713 }
 714
 715 static u32 cirrus_lfb_addr VAR16;
 716
 717 static void
 718 cirrus_vesa_01h(struct bregs *regs)
 719 {
 720     u16 mode = cirrus_vesamode_to_mode(regs->cx & 0x3fff);
 721     if (!mode) {
 722         regs->ax = 0x014f;
 723         return;
 724     }
 725     struct cirrus_mode_s *table_g = cirrus_get_modeentry(mode);
 726     u32 lfb = GET_GLOBAL(cirrus_lfb_addr); // XXX
 727     if ((regs->cx & 0x4000) && !lfb) {
 728         regs->ax = 0x014f;
 729         return;
 730     }
 731
 732     u16 seg = regs->es;
 733     struct vbe_mode_info *info = (void*)(regs->di+0);
 734     memset_far(seg, info, 0, sizeof(*info));
 735
 736     SET_FARVAR(seg, info->mode_attributes, lfb ? 0xbb : 0x3b);
 737     SET_FARVAR(seg, info->winA_attributes, 0x07);
 738     SET_FARVAR(seg, info->winB_attributes, 0);
 739     SET_FARVAR(seg, info->win_granularity, 16);
 740     SET_FARVAR(seg, info->win_size, 64);
 741     SET_FARVAR(seg, info->winA_seg, SEG_GRAPH);
 742     SET_FARVAR(seg, info->winB_seg, 0x0);
 743     SET_FARVAR(seg, info->win_func_ptr.segoff, 0x0); // XXX
 744     u16 linesize = cirrus_get_line_offset_entry(table_g);
 745     SET_FARVAR(seg, info->bytes_per_scanline, linesize);
 746     SET_FARVAR(seg, info->xres, GET_GLOBAL(table_g->width));
 747     u16 height = GET_GLOBAL(table_g->height);
 748     SET_FARVAR(seg, info->yres, height);
 749     SET_FARVAR(seg, info->xcharsize, 8);
 750     SET_FARVAR(seg, info->ycharsize, 16);
 751     SET_FARVAR(seg, info->planes, 1);
 752     SET_FARVAR(seg, info->bits_per_pixel, GET_GLOBAL(table_g->depth));
 753     SET_FARVAR(seg, info->banks, 1);
 754     SET_FARVAR(seg, info->mem_model, GET_GLOBAL(table_g->vesacolortype));
 755     SET_FARVAR(seg, info->bank_size, 0);
 756
 757     int pages = (cirrus_get_memsize() * 64 * 1024) / (height * linesize);
 758     SET_FARVAR(seg, info->pages, pages - 1);
 759     SET_FARVAR(seg, info->reserved0, 0);
 760
 761     SET_FARVAR(seg, info->red_size, GET_GLOBAL(table_g->vesaredmask));
 762     SET_FARVAR(seg, info->red_pos, GET_GLOBAL(table_g->vesaredpos));
 763     SET_FARVAR(seg, info->green_size, GET_GLOBAL(table_g->vesagreenmask));
 764     SET_FARVAR(seg, info->green_pos, GET_GLOBAL(table_g->vesagreenpos));
 765     SET_FARVAR(seg, info->blue_size, GET_GLOBAL(table_g->vesabluemask));
 766     SET_FARVAR(seg, info->blue_pos, GET_GLOBAL(table_g->vesabluepos));
 767     SET_FARVAR(seg, info->alpha_size, GET_GLOBAL(table_g->vesareservedmask));
 768     SET_FARVAR(seg, info->alpha_pos, GET_GLOBAL(table_g->vesareservedpos));
 769     u8 directcolor_info = GET_GLOBAL(table_g->bitsperpixel) <= 8;
 770     SET_FARVAR(seg, info->directcolor_info, directcolor_info);
 771
 772     SET_FARVAR(seg, info->phys_base, lfb);
 773
 774     regs->ax = 0x004f;
 775 }
 776
 777 static void
 778 cirrus_vesa_02h(struct bregs *regs)
 779 {
 780     if (regs->bx & 0x3e00) {
 781         regs->ax = 0x014f;
 782         return;
 783     }
 784     if ((regs->bx & 0x1ff) < 0x100) {
 785         // XXX - call legacy mode switch
 786         regs->ax = 0x004f;
 787         return;
 788     }
 789
 790     u16 mode = cirrus_vesamode_to_mode(regs->cx & 0x3fff);
 791     if (!mode) {
 792         regs->ax = 0x014f;
 793         return;
 794     }
 795     struct cirrus_mode_s *table_g = cirrus_get_modeentry(mode);
 796     cirrus_switch_mode(table_g);
 797
 798     if (!(regs->bx & 0x4000))
 799         cirrus_enable_16k_granularity();
 800     if (!(regs->bx & 0x8000))
 801         cirrus_clear_vram(0);
 802     SET_BDA(video_mode, mode);
 803     SET_BDA(vbe_mode, regs->bx);
 804
 805     regs->ax = 0x004f;
 806 }
 807
 808 static void
 809 cirrus_vesa_03h(struct bregs *regs)
 810 {
 811     u16 mode = GET_BDA(vbe_mode);
 812     if (!mode)
 813         mode = GET_BDA(video_mode);
 814     regs->bx = mode;
 815
 816     regs->ax = 0x004f;
 817 }
 818
 819 // XXX - add cirrus_vesa_05h_farentry to vgaentry.S
 820
 821 static void
 822 cirrus_vesa_05h(struct bregs *regs)
 823 {
 824     if (regs->bl > 1)
 825         goto fail;
 826     if (regs->bh == 0) {
 827         // set mempage
 828         if (regs->dx >= 0x100)
 829             goto fail;
 830         outw((regs->dx << 8) | (regs->bl + 9), VGAREG_GRDC_ADDRESS);
 831     } else if (regs->bh == 1) {
 832         // get mempage
 833         outb(regs->bl + 9, VGAREG_GRDC_ADDRESS);
 834         regs->dx = inb(VGAREG_GRDC_DATA);
 835     } else
 836         goto fail;
 837
 838     regs->ax = 0x004f;
 839     return;
 840 fail:
 841     regs->ax = 0x014f;
 842 }
 843
 844 static void
 845 cirrus_vesa_06h(struct bregs *regs)
 846 {
 847     if (regs->bl > 2) {
 848         regs->ax = 0x0100;
 849         return;
 850     }
 851
 852     if (regs->bl == 0x00) {
 853         cirrus_set_line_offset(cirrus_get_bpp_bytes() * regs->cx);
 854     } else if (regs->bl == 0x02) {
 855         cirrus_set_line_offset(regs->cx);
 856     }
 857
 858     u32 v = cirrus_get_line_offset();
 859     regs->cx = v / cirrus_get_bpp_bytes();
 860     regs->bx = v;
 861     regs->dx = (cirrus_get_memsize() * 64 * 1024) / v;
 862     regs->ax = 0x004f;
 863 }
 864
 865 static void
 866 cirrus_vesa_07h(struct bregs *regs)
 867 {
 868     if (regs->bl == 0x80 || regs->bl == 0x00) {
 869         u32 addr = (cirrus_get_bpp_bytes() * regs->cx
 870                     + cirrus_get_line_offset() * regs->dx);
 871         cirrus_set_start_addr(addr / 4);
 872     } else if (regs->bl == 0x01) {
 873         u32 addr = cirrus_get_start_addr() * 4;
 874         u32 linelength = cirrus_get_line_offset();
 875         regs->dx = addr / linelength;
 876         regs->cx = (addr % linelength) / cirrus_get_bpp_bytes();
 877     } else {
 878         regs->ax = 0x0100;
 879         return;
 880     }
 881
 882     regs->ax = 0x004f;
 883 }
 884
 885 static void
 886 cirrus_vesa_10h(struct bregs *regs)
 887 {
 888     if (regs->bl == 0x00) {
 889         regs->bx = 0x0f30;
 890         regs->ax = 0x004f;
 891         return;
 892     }
 893     if (regs->bl == 0x01) {
 894         SET_BDA(vbe_flag, regs->bh);
 895         regs->ax = 0x004f;
 896         return;
 897     }
 898     if (regs->bl == 0x02) {
 899         regs->bh = GET_BDA(vbe_flag);
 900         regs->ax = 0x004f;
 901         return;
 902     }
 903     regs->ax = 0x014f;
 904 }
 905
 906 static void
 907 cirrus_vesa_not_handled(struct bregs *regs)
 908 {
 909     debug_stub(regs);
 910     regs->ax = 0x014f;
 911 }
 912
 913 void
 914 cirrus_vesa(struct bregs *regs)
 915 {
 916     switch (regs->al) {
 917     case 0x00: cirrus_vesa_00h(regs); break;
 918     case 0x01: cirrus_vesa_01h(regs); break;
 919     case 0x02: cirrus_vesa_02h(regs); break;
 920     case 0x03: cirrus_vesa_03h(regs); break;
 921     case 0x05: cirrus_vesa_05h(regs); break;
 922     case 0x06: cirrus_vesa_06h(regs); break;
 923     case 0x07: cirrus_vesa_07h(regs); break;
 924     case 0x10: cirrus_vesa_10h(regs); break;
 925     default:   cirrus_vesa_not_handled(regs); break;
 926     }
 927 }
 928
 929
 930 /****************************************************************
 931  * init
 932  ****************************************************************/
 933
 934 void
 935 cirrus_init(void)
 936 {
 937     dprintf(1, "cirrus init\n");
 938     if (! cirrus_check())
 939         return;
 940     dprintf(1, "cirrus init 2\n");
 941
 942     // memory setup
 943     outb(0x0f, VGAREG_SEQU_ADDRESS);
 944     u8 v = inb(VGAREG_SEQU_DATA);
 945     outb(((v & 0x18) << 8) | 0x0a, VGAREG_SEQU_ADDRESS);
 946     // set vga mode
 947     outw(0x0007, VGAREG_SEQU_ADDRESS);
 948     // reset bitblt
 949     outw(0x0431, VGAREG_GRDC_ADDRESS);
 950     outw(0x0031, VGAREG_GRDC_ADDRESS);
 951 }