util/vgabios/int10.c

   1 #include <stdio.h>
   2 #include "test.h"
   3 #include "pci.h"
   4
   5 void x86emu_dump_xregs(void);
   6 extern ptr current;
   7 extern int verbose;
   8
   9
  10 #ifndef _PC
  11 /*
  12  * This is derived from a number of PC system BIOS'es.  The intent here is to
  13  * provide very primitive video support, before an EGA/VGA BIOS installs its
  14  * own interrupt vector.  Here, "Ignored" calls should remain so.  "Not
  15  * Implemented" denotes functionality that can be implemented should the need
  16  * arise.  What are "Not Implemented" throughout are video memory accesses.
  17  * Also, very little input validity checking is done here.
  18  */
  19 int int42_handler()
  20 {
  21 #if 0
  22         if (verbose && X86_AH != 0x0e) {
  23                 printf("int%x\n", current->num);
  24                 x86emu_dump_xregs();
  25         }
  26
  27         switch (X86_AH) {
  28         case 0x00:
  29                 /* Set Video Mode                                     */
  30                 /* Enter:  AL = video mode number                     */
  31                 /* Leave:  Nothing                                    */
  32                 /* Implemented (except for clearing the screen)       */
  33                 {               /* Localise */
  34                         int i;
  35                         u16 ioport, int1d, regvals, tmp;
  36                         u8 mode, cgamode, cgacolour;
  37
  38                         /*
  39                          * Ignore all mode numbers but 0x00-0x13.  Some systems also ignore
  40                          * 0x0B and 0x0C, but don't do that here.
  41                          */
  42                         if (X86_AL > 0x13)
  43                                 break;
  44
  45                         /*
  46                          * You didn't think that was really the mode set, did you?  There
  47                          * are only so many slots in the video parameter table...
  48                          */
  49                         mode = X86_AL;
  50                         ioport = 0x03D4;
  51                         switch (MEM_RB(0x0410) & 0x30) {
  52                         case 0x30:      /* MDA */
  53                                 mode = 0x07;    /* Force mode to 0x07 */
  54                                 ioport = 0x03B4;
  55                                 break;
  56                         case 0x10:      /* CGA 40x25 */
  57                                 if (mode >= 0x07)
  58                                         mode = 0x01;
  59                                 break;
  60                         case 0x20:      /* CGA 80x25 (MCGA?) */
  61                                 if (mode >= 0x07)
  62                                         mode = 0x03;
  63                                 break;
  64                         case 0x00:      /* EGA/VGA */
  65                                 if (mode >= 0x07)       /* Don't try MDA timings */
  66                                         mode = 0x01;    /* !?!?! */
  67                                 break;
  68                         }
  69
  70                         /* Locate data in video parameter table */
  71                         int1d = MEM_RW(0x1d << 2);
  72                         regvals = ((mode >> 1) << 4) + int1d;
  73                         cgacolour = 0x30;
  74                         if (mode == 0x06) {
  75                                 regvals -= 0x10;
  76                                 cgacolour = 0x3F;
  77                         }
  78
  79             /** Update BIOS Data Area **/
  80
  81                         /* Video mode */
  82                         MEM_WB(0x0449, mode);
  83
  84                         /* Columns */
  85                         tmp = MEM_RB(mode + int1d + 0x48);
  86                         MEM_WW(0x044A, tmp);
  87
  88                         /* Page length */
  89                         tmp = MEM_RW((mode & 0x06) + int1d + 0x40);
  90                         MEM_WW(0x044C, tmp);
  91
  92                         /* Start Address */
  93                         MEM_WW(0x044E, 0);
  94
  95                         /* Cursor positions, one for each display page */
  96                         for (i = 0x0450; i < 0x0460; i += 2)
  97                                 MEM_WW(i, 0);
  98
  99                         /* Cursor start & end scanlines */
 100                         tmp = MEM_RB(regvals + 0x0B);
 101                         MEM_WB(0x0460, tmp);
 102                         tmp = MEM_RB(regvals + 0x0A);
 103                         MEM_WB(0x0461, tmp);
 104
 105                         /* Current display page number */
 106                         MEM_WB(0x0462, 0);
 107
 108                         /* CRTC I/O address */
 109                         MEM_WW(0x0463, ioport);
 110
 111                         /* CGA Mode register value */
 112                         cgamode = MEM_RB(mode + int1d + 0x50);
 113                         MEM_WB(0x0465, cgamode);
 114
 115                         /* CGA Colour register value */
 116                         MEM_WB(0x0466, cgacolour);
 117
 118                         /* Rows */
 119                         MEM_WB(0x0484, (25 - 1));
 120
 121                         /* Programme the mode */
 122                         outb(ioport + 4, cgamode & 0x37);       /* Turn off screen */
 123                         for (i = 0; i < 0x10; i++) {
 124                                 tmp = MEM_RB(regvals + i);
 125                                 outb(ioport, i);
 126                                 outb(ioport + 1, tmp);
 127                         }
 128                         outb(ioport + 5, cgacolour);    /* Select colour mode */
 129                         outb(ioport + 4, cgamode);      /* Turn on screen */
 130                 }
 131                 break;
 132
 133         case 0x01:
 134                 /* Set Cursor Type                                    */
 135                 /* Enter:  CH = starting line for cursor              */
 136                 /*         CL = ending line for cursor                */
 137                 /* Leave:  Nothing                                    */
 138                 /* Implemented                                        */
 139                 {               /* Localise */
 140                         u16 ioport = MEM_RW(0x0463);
 141
 142                         MEM_WB(0x0460, X86_CL);
 143                         MEM_WB(0x0461, X86_CH);
 144
 145                         outb(ioport, 0x0A);
 146                         outb(ioport + 1, X86_CH);
 147                         outb(ioport, 0x0B);
 148                         outb(ioport + 1, X86_CL);
 149                 }
 150                 break;
 151
 152         case 0x02:
 153                 /* Set Cursor Position                                */
 154                 /* Enter:  BH = display page number                   */
 155                 /*         DH = row                                   */
 156                 /*         DL = column                                */
 157                 /* Leave:  Nothing                                    */
 158                 /* Implemented                                        */
 159                 {               /* Localise */
 160                         u16 offset, ioport;
 161
 162                         MEM_WB((X86_BH << 1) + 0x0450, X86_DL);
 163                         MEM_WB((X86_BH << 1) + 0x0451, X86_DH);
 164
 165                         if (X86_BH != MEM_RB(0x0462))
 166                                 break;
 167
 168                         offset = (X86_DH * MEM_RW(0x044A)) + X86_DL;
 169                         offset += MEM_RW(0x044E) << 1;
 170
 171                         ioport = MEM_RW(0x0463);
 172                         outb(ioport, 0x0E);
 173                         outb(ioport + 1, offset >> 8);
 174                         outb(ioport, 0x0F);
 175                         outb(ioport + 1, offset & 0xFF);
 176                 }
 177                 break;
 178
 179         case 0x03:
 180                 /* Get Cursor Position                                */
 181                 /* Enter:  BH = display page number                   */
 182                 /* Leave:  CH = starting line for cursor              */
 183                 /*         CL = ending line for cursor                */
 184                 /*         DH = row                                   */
 185                 /*         DL = column                                */
 186                 /* Implemented                                        */
 187                 {               /* Localise */
 188                         X86_CL = MEM_RB(0x0460);
 189                         X86_CH = MEM_RB(0x0461);
 190                         X86_DL = MEM_RB((X86_BH << 1) + 0x0450);
 191                         X86_DH = MEM_RB((X86_BH << 1) + 0x0451);
 192                 }
 193                 break;
 194
 195         case 0x04:
 196                 /* Get Light Pen Position                             */
 197                 /* Enter:  Nothing                                    */
 198                 /* Leave:  AH = 0x01 (down/triggered) or 0x00 (not)   */
 199                 /*         BX = pixel column                          */
 200                 /*         CX = pixel row                             */
 201                 /*         DH = character row                         */
 202                 /*         DL = character column                      */
 203                 /* Not Implemented                                    */
 204                 {               /* Localise */
 205                         printf("int%x - Get Light Pen Position. "
 206                                "Function not implemented.\n", current->num);
 207                         x86emu_dump_xregs();
 208                         X86_AH = X86_BX = X86_CX = X86_DX = 0;
 209                 }
 210                 break;
 211
 212         case 0x05:
 213                 /* Set Display Page                                   */
 214                 /* Enter:  AL = display page number                   */
 215                 /* Leave:  Nothing                                    */
 216                 /* Implemented                                        */
 217                 {               /* Localise */
 218                         u16 start, ioport = MEM_RW(0x0463);
 219                         u8 x, y;
 220
 221                         /* Calculate new start address */
 222                         MEM_WB(0x0462, X86_AL);
 223                         start = X86_AL * MEM_RW(0x044C);
 224                         MEM_WW(0x044E, start);
 225                         start <<= 1;
 226
 227                         /* Update start address */
 228                         outb(ioport, 0x0C);
 229                         outb(ioport + 1, start >> 8);
 230                         outb(ioport, 0x0D);
 231                         outb(ioport + 1, start & 0xFF);
 232
 233                         /* Switch cursor position */
 234                         y = MEM_RB((X86_AL << 1) + 0x0450);
 235                         x = MEM_RB((X86_AL << 1) + 0x0451);
 236                         start += (y * MEM_RW(0x044A)) + x;
 237
 238                         /* Update cursor position */
 239                         outb(ioport, 0x0E);
 240                         outb(ioport + 1, start >> 8);
 241                         outb(ioport, 0x0F);
 242                         outb(ioport + 1, start & 0xFF);
 243                 }
 244                 break;
 245
 246         case 0x06:
 247                 /* Initialise or Scroll Window Up                     */
 248                 /* Enter:  AL = lines to scroll up                    */
 249                 /*         BH = attribute for blank                   */
 250                 /*         CH = upper y of window                     */
 251                 /*         CL = left x of window                      */
 252                 /*         DH = lower y of window                     */
 253                 /*         DL = right x of window                     */
 254                 /* Leave:  Nothing                                    */
 255                 /* Not Implemented                                    */
 256                 {               /* Localise */
 257                         printf("int%x: Initialise or Scroll Window Up - "
 258                                "Function not implemented.\n", current->num);
 259                         x86emu_dump_xregs();
 260                 }
 261                 break;
 262
 263         case 0x07:
 264                 /* Initialise or Scroll Window Down                   */
 265                 /* Enter:  AL = lines to scroll down                  */
 266                 /*         BH = attribute for blank                   */
 267                 /*         CH = upper y of window                     */
 268                 /*         CL = left x of window                      */
 269                 /*         DH = lower y of window                     */
 270                 /*         DL = right x of window                     */
 271                 /* Leave:  Nothing                                    */
 272                 /* Not Implemented                                    */
 273                 {               /* Localise */
 274                         printf("int%x: Initialise or Scroll Window Down - "
 275                                "Function not implemented.\n", current->num);
 276                         x86emu_dump_xregs();
 277
 278                 }
 279                 break;
 280
 281         case 0x08:
 282                 /* Read Character and Attribute at Cursor             */
 283                 /* Enter:  BH = display page number                   */
 284                 /* Leave:  AH = attribute                             */
 285                 /*         AL = character                             */
 286                 /* Not Implemented                                    */
 287                 {               /* Localise */
 288                         printf
 289                             ("int%x: Read Character and Attribute at Cursor - "
 290                              "Function not implemented.\n", current->num);
 291                         x86emu_dump_xregs();
 292
 293                         X86_AX = 0;
 294                 }
 295                 break;
 296
 297         case 0x09:
 298                 /* Write Character and Attribute at Cursor            */
 299                 /* Enter:  AL = character                             */
 300                 /*         BH = display page number                   */
 301                 /*         BL = attribute (text) or colour (graphics) */
 302                 /*         CX = replication count                     */
 303                 /* Leave:  Nothing                                    */
 304                 /* Not Implemented                                    */
 305                 {               /* Localise */
 306                         printf
 307                             ("int%x: Write Character and Attribute at Cursor - "
 308                              "Function not implemented.\n", current->num);
 309                         x86emu_dump_xregs();
 310
 311                 }
 312                 break;
 313
 314         case 0x0a:
 315                 /* Write Character at Cursor                          */
 316                 /* Enter:  AL = character                             */
 317                 /*         BH = display page number                   */
 318                 /*         BL = colour                                */
 319                 /*         CX = replication count                     */
 320                 /* Leave:  Nothing                                    */
 321                 /* Not Implemented                                    */
 322                 {               /* Localise */
 323                         printf("int%x: Write Character at Cursor - "
 324                                "Function not implemented.\n", current->num);
 325                         x86emu_dump_xregs();
 326
 327                 }
 328                 break;
 329
 330         case 0x0b:
 331                 /* Set Palette, Background or Border                  */
 332                 /* Enter:  BH = 0x00 or 0x01                          */
 333                 /*         BL = colour or palette (respectively)      */
 334                 /* Leave:  Nothing                                    */
 335                 /* Implemented                                        */
 336                 {               /* Localise */
 337                         u16 ioport = MEM_RW(0x0463) + 5;
 338                         u8 cgacolour = MEM_RB(0x0466);
 339
 340                         if (X86_BH) {
 341                                 cgacolour &= 0xDF;
 342                                 cgacolour |= (X86_BL & 0x01) << 5;
 343                         } else {
 344                                 cgacolour &= 0xE0;
 345                                 cgacolour |= X86_BL & 0x1F;
 346                         }
 347
 348                         MEM_WB(0x0466, cgacolour);
 349                         outb(ioport, cgacolour);
 350                 }
 351                 break;
 352
 353         case 0x0c:
 354                 /* Write Graphics Pixel                               */
 355                 /* Enter:  AL = pixel value                           */
 356                 /*         BH = display page number                   */
 357                 /*         CX = column                                */
 358                 /*         DX = row                                   */
 359                 /* Leave:  Nothing                                    */
 360                 /* Not Implemented                                    */
 361                 {               /* Localise */
 362                         printf("int%x: Write Graphics Pixel - "
 363                                "Function not implemented.\n", current->num);
 364                         x86emu_dump_xregs();
 365
 366                 }
 367                 break;
 368
 369         case 0x0d:
 370                 /* Read Graphics Pixel                                */
 371                 /* Enter:  BH = display page number                   */
 372                 /*         CX = column                                */
 373                 /*         DX = row                                   */
 374                 /* Leave:  AL = pixel value                           */
 375                 /* Not Implemented                                    */
 376                 {               /* Localise */
 377                         printf("int%x: Write Graphics Pixel - "
 378                                "Function not implemented.\n", current->num);
 379                         x86emu_dump_xregs();
 380
 381                         X86_AL = 0;
 382
 383                 }
 384                 break;
 385
 386         case 0x0e:
 387                 /* Write Character in Teletype Mode                   */
 388                 /* Enter:  AL = character                             */
 389                 /*         BH = display page number                   */
 390                 /*         BL = foreground colour                     */
 391                 /* Leave:  Nothing                                    */
 392                 /* Not Implemented                                    */
 393                 /* WARNING:  Emulation of BEL characters will require */
 394                 /*           emulation of RTC and PC speaker I/O.     */
 395                 /*           Also, this recurses through int 0x10     */
 396                 /*           which might or might not have been       */
 397                 /*           installed yet.                           */
 398                 {               /* Localise */
 399 #ifdef PARANOID
 400                         printf("int%x: Write Character in Teletype Mode - "
 401                                "Function not implemented.\n", current->num);
 402                         x86emu_dump_xregs();
 403 #endif
 404                         printf("%c", X86_AL);
 405                 }
 406                 break;
 407
 408         case 0x0f:
 409                 /* Get Video Mode                                     */
 410                 /* Enter:  Nothing                                    */
 411                 /* Leave:  AH = number of columns                     */
 412                 /*         AL = video mode number                     */
 413                 /*         BH = display page number                   */
 414                 /* Implemented                                        */
 415                 {               /* Localise */
 416                         X86_AH = MEM_RW(0x044A);
 417                         X86_AL = MEM_RB(0x0449);
 418                         X86_BH = MEM_RB(0x0462);
 419                 }
 420                 break;
 421
 422         case 0x10:
 423                 /* Colour Control (subfunction in AL)                 */
 424                 /* Enter:  Various                                    */
 425                 /* Leave:  Various                                    */
 426                 /* Ignored                                            */
 427                 break;
 428
 429         case 0x11:
 430                 /* Font Control (subfunction in AL)                   */
 431                 /* Enter:  Various                                    */
 432                 /* Leave:  Various                                    */
 433                 /* Ignored                                            */
 434                 break;
 435
 436         case 0x12:
 437                 /* Miscellaneous (subfunction in BL)                  */
 438                 /* Enter:  Various                                    */
 439                 /* Leave:  Various                                    */
 440                 /* Ignored.  Previous code here optionally allowed    */
 441                 /* the enabling and disabling of VGA, but no system   */
 442                 /* BIOS I've come across actually implements it.      */
 443                 break;
 444
 445         case 0x13:
 446                 /* Write String in Teletype Mode                      */
 447                 /* Enter:  AL = write mode                            */
 448                 /*         BL = attribute (if (AL & 0x02) == 0)       */
 449                 /*         CX = string length                         */
 450                 /*         DH = row                                   */
 451                 /*         DL = column                                */
 452                 /*         ES:BP = string segment:offset              */
 453                 /* Leave:  Nothing                                    */
 454                 /* Not Implemented                                    */
 455                 /* WARNING:  Emulation of BEL characters will require */
 456                 /*           emulation of RTC and PC speaker I/O.     */
 457                 /*           Also, this recurses through int 0x10     */
 458                 /*           which might or might not have been       */
 459                 /*           installed yet.                           */
 460                 {               /* Localise */
 461                         printf("int%x: Write String in Teletype Mode - "
 462                                "Function not implemented.\n", current->num);
 463                         x86emu_dump_xregs();
 464
 465                 }
 466                 break;
 467
 468         default:
 469                 /* Various extensions                                 */
 470                 /* Enter:  Various                                    */
 471                 /* Leave:  Various                                    */
 472                 /* Ignored                                            */
 473                 break;
 474         }
 475 #endif
 476         return 1;
 477 }
 478 #endif