reactos/subsystems/ntvdm/bios/bios32/bios32.c

   1 /*
   2  * COPYRIGHT:       GPL - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            bios32.c
   5  * PURPOSE:         VDM 32-bit BIOS
   6  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #define NDEBUG
  12
  13 /* For BIOS Version number */
  14 #include <reactos/buildno.h>
  15
  16 #include "emulator.h"
  17 #include "cpu/cpu.h" // for EMULATOR_FLAG_CF
  18 #include "cpu/bop.h"
  19 #include "int32.h"
  20
  21 #include <bios/bios.h>
  22 #include <bios/rom.h>
  23 #include "bios32.h"
  24 #include "bios32p.h"
  25 #include "kbdbios32.h"
  26 #include "vidbios32.h"
  27 #include "moubios32.h"
  28
  29 #include "io.h"
  30 #include "hardware/cmos.h"
  31 #include "hardware/pic.h"
  32 #include "hardware/timer.h"
  33
  34 /* Extra PSDK/NDK Headers */
  35 #include <ndk/kefuncs.h>
  36
  37 /* PRIVATE VARIABLES **********************************************************/
  38
  39 CALLBACK16 BiosContext;
  40
  41 /*
  42
  43 Bochs BIOS, see rombios.h
  44 =========================
  45
  46 // model byte 0xFC = AT
  47 #define SYS_MODEL_ID     0xFC
  48 #define SYS_SUBMODEL_ID  0x00
  49 #define BIOS_REVISION    1
  50 #define BIOS_CONFIG_TABLE 0xe6f5
  51
  52 #ifndef BIOS_BUILD_DATE
  53 #  define BIOS_BUILD_DATE "06/23/99"
  54 #endif
  55
  56 // 1K of base memory used for Extended Bios Data Area (EBDA)
  57 // EBDA is used for PS/2 mouse support, and IDE BIOS, etc.
  58 #define EBDA_SEG           0x9FC0
  59 #define EBDA_SIZE          1              // In KiB
  60 #define BASE_MEM_IN_K   (640 - EBDA_SIZE)
  61
  62
  63 See rombios.c
  64 =============
  65
  66 ROM BIOS compatibility entry points:
  67 ===================================
  68 $e05b ; POST Entry Point
  69 $e2c3 ; NMI Handler Entry Point
  70 $e3fe ; INT 13h Fixed Disk Services Entry Point
  71 $e401 ; Fixed Disk Parameter Table
  72 $e6f2 ; INT 19h Boot Load Service Entry Point
  73 $e6f5 ; Configuration Data Table
  74 $e729 ; Baud Rate Generator Table
  75 $e739 ; INT 14h Serial Communications Service Entry Point
  76 $e82e ; INT 16h Keyboard Service Entry Point
  77 $e987 ; INT 09h Keyboard Service Entry Point
  78 $ec59 ; INT 13h Diskette Service Entry Point
  79 $ef57 ; INT 0Eh Diskette Hardware ISR Entry Point
  80 $efc7 ; Diskette Controller Parameter Table
  81 $efd2 ; INT 17h Printer Service Entry Point
  82 $f045 ; INT 10 Functions 0-Fh Entry Point
  83 $f065 ; INT 10h Video Support Service Entry Point
  84 $f0a4 ; MDA/CGA Video Parameter Table (INT 1Dh)
  85 $f841 ; INT 12h Memory Size Service Entry Point
  86 $f84d ; INT 11h Equipment List Service Entry Point
  87 $f859 ; INT 15h System Services Entry Point
  88 $fa6e ; Character Font for 320x200 & 640x200 Graphics (lower 128 characters)
  89 $fe6e ; INT 1Ah Time-of-day Service Entry Point
  90 $fea5 ; INT 08h System Timer ISR Entry Point
  91 $fef3 ; Initial Interrupt Vector Offsets Loaded by POST
  92 $ff53 ; IRET Instruction for Dummy Interrupt Handler
  93 $ff54 ; INT 05h Print Screen Service Entry Point
  94 $fff0 ; Power-up Entry Point
  95 $fff5 ; ASCII Date ROM was built - 8 characters in MM/DD/YY
  96 $fffe ; System Model ID
  97
  98 */
  99
 100 /*
 101  * See Ralf Brown: http://www.ctyme.com/intr/rb-1594.htm#Table515
 102  * for more information.
 103  */
 104 #define BIOS_MODEL      0xFC // PC-AT
 105 #define BIOS_SUBMODEL   0x01 // AT models 319,339 8 MHz, Enh Keyb, 3.5"
 106 #define BIOS_REVISION   0x00
 107 // FIXME: Find a nice PS/2 486 + 487 BIOS combination!
 108
 109 /*
 110  * WARNING! For compatibility purposes the string "IBM" should be at F000:E00E .
 111  * Some programs alternatively look at "COPR. IBM" that is at F000:E008 .
 112  */
 113 static const CHAR BiosCopyright[] = "0000000 NTVDM IBM Compatible 486 32-bit BIOS Copyright (C) ReactOS Team 1996-2014";
 114 static const CHAR BiosVersion[]   = "ReactOS NTVDM 32-bit BIOS "KERNEL_VERSION_STR" (Build "KERNEL_VERSION_BUILD_STR")";
 115 static const CHAR BiosDate[]      = "06/17/13";
 116
 117 C_ASSERT(sizeof(BiosCopyright)-1 <= 0x5B); // Ensures that we won't overflow on the POST Code starting at F000:E05B
 118 C_ASSERT(sizeof(BiosDate)-1      == 0x08);
 119
 120 /* 16-bit bootstrap code at F000:FFF0 */
 121 static BYTE Bootstrap[] =
 122 {
 123     0xEA,                   // jmp far ptr
 124     0x5B, 0xE0, 0x00, 0xF0, // F000:E05B
 125 };
 126
 127 /*
 128  * Normally at F000:E05B there is the POST that finally calls the bootstrap
 129  * interrupt. It should also check the value of Bda->SoftReset. Since we do
 130  * all the POST in 32 bit from the start, we just place there the bootstrap
 131  * interrupt call.
 132  */
 133 static BYTE PostCode[] =
 134 {
 135     LOBYTE(EMULATOR_BOP), HIBYTE(EMULATOR_BOP), BOP_RESET,  // Call BIOS POST
 136     0xCD, 0x19,                                             // INT 0x19, the bootstrap loader interrupt
 137 //  LOBYTE(EMULATOR_BOP), HIBYTE(EMULATOR_BOP), BOP_UNSIMULATE
 138 };
 139
 140
 141 /* PRIVATE FUNCTIONS **********************************************************/
 142
 143 static VOID WINAPI BiosException(LPWORD Stack)
 144 {
 145     /* Get the exception number and call the emulator API */
 146     BYTE ExceptionNumber = LOBYTE(Stack[STACK_INT_NUM]);
 147     EmulatorException(ExceptionNumber, Stack);
 148 }
 149
 150 static VOID WINAPI BiosMiscService(LPWORD Stack)
 151 {
 152     switch (getAH())
 153     {
 154         /* Keyboard intercept */
 155         case 0x4F:
 156         {
 157             /* CF should be set but let's just set it again just in case */
 158             /* Do not modify AL (the hardware scan code), but set CF to continue processing */
 159             // setCF(1);
 160             Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
 161             break;
 162         }
 163
 164         /* Wait */
 165         case 0x86:
 166         {
 167             /*
 168              * Interval in microseconds in CX:DX
 169              * See Ralf Brown: http://www.ctyme.com/intr/rb-1525.htm
 170              * for more information.
 171              */
 172             LARGE_INTEGER TimeOut;
 173             TimeOut.QuadPart = MAKELONG(getDX(), getCX()) * -10LL;
 174
 175             // HACK: For now, use the NT API (time in hundreds of nanoseconds).
 176             NtDelayExecution(FALSE, &TimeOut);
 177
 178             /* Clear CF */
 179             Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
 180
 181             break;
 182         }
 183
 184         /* Copy Extended Memory */
 185         case 0x87:
 186         {
 187             DWORD Count = (DWORD)getCX() * 2;
 188             PFAST486_GDT_ENTRY Gdt = (PFAST486_GDT_ENTRY)SEG_OFF_TO_PTR(getES(), getSI());
 189             DWORD SourceBase = Gdt[2].Base + (Gdt[2].BaseMid << 16) + (Gdt[2].BaseHigh << 24);
 190             DWORD SourceLimit = Gdt[2].Limit + (Gdt[2].LimitHigh << 16);
 191             DWORD DestBase = Gdt[3].Base + (Gdt[3].BaseMid << 16) + (Gdt[3].BaseHigh << 24);
 192             DWORD DestLimit = Gdt[3].Limit + (Gdt[3].LimitHigh << 16);
 193
 194             /* Check for flags */
 195             if (Gdt[2].Granularity) SourceLimit = (SourceLimit << 12) | 0xFFF;
 196             if (Gdt[3].Granularity) DestLimit = (DestLimit << 12) | 0xFFF;
 197
 198             if ((Count > SourceLimit) || (Count > DestLimit))
 199             {
 200                 setAX(0x80);
 201                 Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
 202
 203                 break;
 204             }
 205
 206             /* Copy */
 207             RtlMoveMemory((PVOID)((ULONG_PTR)BaseAddress + DestBase),
 208                           (PVOID)((ULONG_PTR)BaseAddress + SourceBase),
 209                           Count);
 210
 211             setAX(ERROR_SUCCESS);
 212             Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
 213             break;
 214         }
 215
 216         /* Get Extended Memory Size */
 217         case 0x88:
 218         {
 219             UCHAR Low, High;
 220
 221             /*
 222              * Return the (usable) extended memory (after 1 MB)
 223              * size in kB from CMOS.
 224              */
 225             IOWriteB(CMOS_ADDRESS_PORT, CMOS_REG_ACTUAL_EXT_MEMORY_LOW);
 226             Low  = IOReadB(CMOS_DATA_PORT);
 227             IOWriteB(CMOS_ADDRESS_PORT, CMOS_REG_ACTUAL_EXT_MEMORY_HIGH);
 228             High = IOReadB(CMOS_DATA_PORT);
 229             setAX(MAKEWORD(Low, High));
 230
 231             /* Clear CF */
 232             Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
 233
 234             break;
 235         }
 236
 237         /* Get Configuration */
 238         case 0xC0:
 239         {
 240             /* Return the BIOS ROM Configuration Table address in ES:BX */
 241             // The BCT is found at F000:E6F5 for 100% compatible BIOSes.
 242             setES(BIOS_SEGMENT);
 243             setBX(0xE6F5);
 244
 245             /* Call successful; clear CF */
 246             setAH(0x00);
 247             Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
 248
 249             break;
 250         }
 251
 252         /* Return Extended-Bios Data-Area Segment Address (PS) */
 253         case 0xC1:
 254         {
 255             // Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
 256             // setES(???);
 257
 258             /* We do not support EBDA yet */
 259             Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
 260
 261             break;
 262         }
 263
 264         /* Pointing Device BIOS Interface (PS) */
 265         case 0xC2:
 266         {
 267             DPRINT1("INT 15h, AH = C2h must be implemented in order to support vendor mouse drivers\n");
 268             break;
 269         }
 270
 271         default:
 272         {
 273             DPRINT1("BIOS Function INT 15h, AH = 0x%02X NOT IMPLEMENTED\n",
 274                     getAH());
 275         }
 276     }
 277 }
 278
 279 static VOID WINAPI BiosRomBasic(LPWORD Stack)
 280 {
 281     /* ROM Basic is unsupported, display a message to the user */
 282     DisplayMessage(L"NTVDM doesn't support ROM Basic. The VDM is closing.");
 283
 284     /* Stop the VDM */
 285     EmulatorTerminate();
 286     return;
 287 }
 288
 289
 290 VOID DosBootsectorInitialize(VOID);
 291
 292 static VOID WINAPI BiosBootstrapLoader(LPWORD Stack)
 293 {
 294     /*
 295      * In real BIOSes one loads the bootsector read from a diskette
 296      * or from a disk, copy it to 0000:7C00 and then boot it.
 297      * Since we are 32-bit VM and we hardcode our DOS at the moment,
 298      * just call the DOS 32-bit initialization code.
 299      */
 300
 301     DPRINT("BiosBootstrapLoader -->\n");
 302
 303     /* Load DOS */
 304     DosBootsectorInitialize();
 305
 306     /*
 307      * Position CPU to 0000:7C00 to boot the OS.
 308      *
 309      * Since we are called via the INT32 mechanism, we need to correctly set
 310      * CS:IP, not by changing the current one (otherwise the interrupt could
 311      * not be clean up and return properly), but by changing the CS:IP in the
 312      * stack, so that when the interrupt returns, the modified CS:IP is popped
 313      * off the stack and the CPU is correctly repositioned.
 314      */
 315     Stack[STACK_CS] = 0x0000;
 316     Stack[STACK_IP] = 0x7C00;
 317
 318     DPRINT("<-- BiosBootstrapLoader\n");
 319 }
 320
 321 static VOID WINAPI BiosTimeService(LPWORD Stack)
 322 {
 323     switch (getAH())
 324     {
 325         case 0x00:
 326         {
 327             /* Set AL to 1 if midnight had passed, 0 otherwise */
 328             setAL(Bda->MidnightPassed ? 0x01 : 0x00);
 329
 330             /* Return the tick count in CX:DX */
 331             setCX(HIWORD(Bda->TickCounter));
 332             setDX(LOWORD(Bda->TickCounter));
 333
 334             /* Reset the midnight flag */
 335             Bda->MidnightPassed = FALSE;
 336
 337             break;
 338         }
 339
 340         case 0x01:
 341         {
 342             /* Set the tick count to CX:DX */
 343             Bda->TickCounter = MAKELONG(getDX(), getCX());
 344
 345             /* Reset the midnight flag */
 346             Bda->MidnightPassed = FALSE;
 347
 348             break;
 349         }
 350
 351         default:
 352         {
 353             DPRINT1("BIOS Function INT 1Ah, AH = 0x%02X NOT IMPLEMENTED\n",
 354                     getAH());
 355         }
 356     }
 357 }
 358
 359 static VOID WINAPI BiosSystemTimerInterrupt(LPWORD Stack)
 360 {
 361     /* Increase the system tick count */
 362     Bda->TickCounter++;
 363 }
 364
 365
 366 // From SeaBIOS
 367 static VOID PicSetIRQMask(USHORT off, USHORT on)
 368 {
 369     UCHAR pic1off = off, pic1on = on, pic2off = off>>8, pic2on = on>>8;
 370     IOWriteB(PIC_MASTER_DATA, (IOReadB(PIC_MASTER_DATA) & ~pic1off) | pic1on);
 371     IOWriteB(PIC_SLAVE_DATA , (IOReadB(PIC_SLAVE_DATA ) & ~pic2off) | pic2on);
 372 }
 373
 374 // From SeaBIOS
 375 VOID EnableHwIRQ(UCHAR hwirq, EMULATOR_INT32_PROC func)
 376 {
 377     UCHAR vector;
 378
 379     PicSetIRQMask(1 << hwirq, 0);
 380     if (hwirq < 8)
 381         vector = BIOS_PIC_MASTER_INT + hwirq;
 382     else
 383         vector = BIOS_PIC_SLAVE_INT  + hwirq - 8;
 384
 385     RegisterBiosInt32(vector, func);
 386 }
 387
 388
 389 VOID PicIRQComplete(LPWORD Stack)
 390 {
 391     /* Get the interrupt number */
 392     BYTE IntNum = LOBYTE(Stack[STACK_INT_NUM]);
 393
 394     /*
 395      * If this was a PIC IRQ, send an End-of-Interrupt to the PIC.
 396      */
 397
 398     if (IntNum >= BIOS_PIC_MASTER_INT && IntNum < BIOS_PIC_MASTER_INT + 8)
 399     {
 400         /* It was an IRQ from the master PIC */
 401         IOWriteB(PIC_MASTER_CMD, PIC_OCW2_EOI);
 402     }
 403     else if (IntNum >= BIOS_PIC_SLAVE_INT && IntNum < BIOS_PIC_SLAVE_INT + 8)
 404     {
 405         /* It was an IRQ from the slave PIC */
 406         IOWriteB(PIC_SLAVE_CMD , PIC_OCW2_EOI);
 407         IOWriteB(PIC_MASTER_CMD, PIC_OCW2_EOI);
 408     }
 409 }
 410
 411 static VOID WINAPI BiosHandleMasterPicIRQ(LPWORD Stack)
 412 {
 413     BYTE IrqNumber;
 414
 415     IOWriteB(PIC_MASTER_CMD, PIC_OCW3_READ_ISR /* == 0x0B */);
 416     IrqNumber = IOReadB(PIC_MASTER_CMD);
 417
 418     DPRINT("Master - IrqNumber = 0x%02X\n", IrqNumber);
 419
 420     PicIRQComplete(Stack);
 421 }
 422
 423 static VOID WINAPI BiosHandleSlavePicIRQ(LPWORD Stack)
 424 {
 425     BYTE IrqNumber;
 426
 427     IOWriteB(PIC_SLAVE_CMD, PIC_OCW3_READ_ISR /* == 0x0B */);
 428     IrqNumber = IOReadB(PIC_SLAVE_CMD);
 429
 430     DPRINT("Slave - IrqNumber = 0x%02X\n", IrqNumber);
 431
 432     PicIRQComplete(Stack);
 433 }
 434
 435 // Timer IRQ 0
 436 static VOID WINAPI BiosTimerIrq(LPWORD Stack)
 437 {
 438     /*
 439      * Perform the system timer interrupt.
 440      *
 441      * Do not call directly BiosSystemTimerInterrupt(Stack);
 442      * because some programs may hook only BIOS_SYS_TIMER_INTERRUPT
 443      * for their purpose...
 444      */
 445     /** EmulatorInterrupt(BIOS_SYS_TIMER_INTERRUPT); **/
 446     Int32Call(&BiosContext, BIOS_SYS_TIMER_INTERRUPT);
 447     PicIRQComplete(Stack);
 448 }
 449
 450
 451 static VOID BiosHwSetup(VOID)
 452 {
 453     /* Initialize the master and the slave PICs (cascade mode) */
 454     IOWriteB(PIC_MASTER_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
 455     IOWriteB(PIC_SLAVE_CMD , PIC_ICW1 | PIC_ICW1_ICW4);
 456
 457     /*
 458      * Set the interrupt vector offsets for each PIC
 459      * (base IRQs: 0x08-0x0F for IRQ 0-7, 0x70-0x77 for IRQ 8-15)
 460      */
 461     IOWriteB(PIC_MASTER_DATA, BIOS_PIC_MASTER_INT);
 462     IOWriteB(PIC_SLAVE_DATA , BIOS_PIC_SLAVE_INT );
 463
 464     /* Tell the master PIC that there is a slave PIC at IRQ 2 */
 465     IOWriteB(PIC_MASTER_DATA, 1 << 2);
 466     /* Tell the slave PIC its cascade identity */
 467     IOWriteB(PIC_SLAVE_DATA , 2);
 468
 469     /* Make sure both PICs are in 8086 mode */
 470     IOWriteB(PIC_MASTER_DATA, PIC_ICW4_8086);
 471     IOWriteB(PIC_SLAVE_DATA , PIC_ICW4_8086);
 472
 473     /* Clear the masks for both PICs */
 474     // IOWriteB(PIC_MASTER_DATA, 0x00);
 475     // IOWriteB(PIC_SLAVE_DATA , 0x00);
 476     /* Disable all IRQs */
 477     IOWriteB(PIC_MASTER_DATA, 0xFF);
 478     IOWriteB(PIC_SLAVE_DATA , 0xFF);
 479
 480
 481     /* Initialize PIT Counter 0 - Mode 2, 16bit binary count */
 482     // NOTE: Some BIOSes set it to Mode 3 instead.
 483     IOWriteB(PIT_COMMAND_PORT, 0x34);
 484     // 18.2Hz refresh rate
 485     IOWriteB(PIT_DATA_PORT(0), 0x00);
 486     IOWriteB(PIT_DATA_PORT(0), 0x00);
 487
 488     /* Initialize PIT Counter 1 - Mode 2, 8bit binary count */
 489     IOWriteB(PIT_COMMAND_PORT, 0x54);
 490     // DRAM refresh every 15ms: http://www.cs.dartmouth.edu/~spl/Academic/Organization/docs/PC%20Timer%208253.html
 491     IOWriteB(PIT_DATA_PORT(1),   18);
 492
 493     /* Initialize PIT Counter 2 - Mode 3, 16bit binary count */
 494     IOWriteB(PIT_COMMAND_PORT, 0xB6);
 495     // Count for 440Hz
 496     IOWriteB(PIT_DATA_PORT(2), 0x97);
 497     IOWriteB(PIT_DATA_PORT(2), 0x0A);
 498
 499     EnableHwIRQ(0, BiosTimerIrq);
 500 }
 501
 502 static VOID InitializeBiosInt32(VOID)
 503 {
 504     USHORT i;
 505
 506     /* Initialize the callback context */
 507     InitializeContext(&BiosContext, BIOS_SEGMENT, 0x0000);
 508
 509     /* Register the default BIOS 32-bit Interrupts */
 510     for (i = 0x00; i <= 0xFF; i++)
 511     {
 512         RegisterBiosInt32(i, NULL);
 513     }
 514
 515     /* Initialize the exception vector interrupts to a default Exception handler */
 516     for (i = 0; i < 8; i++)
 517         RegisterBiosInt32(i, BiosException);
 518
 519     /* Initialize HW vector interrupts to a default HW handler */
 520     for (i = BIOS_PIC_MASTER_INT; i < BIOS_PIC_MASTER_INT + 8; i++)
 521         RegisterBiosInt32(i, BiosHandleMasterPicIRQ);
 522     for (i = BIOS_PIC_SLAVE_INT ; i < BIOS_PIC_SLAVE_INT  + 8; i++)
 523         RegisterBiosInt32(i, BiosHandleSlavePicIRQ);
 524
 525     /* Initialize software vector handlers */
 526     RegisterBiosInt32(BIOS_EQUIPMENT_INTERRUPT, BiosEquipmentService    );
 527     RegisterBiosInt32(BIOS_MEMORY_SIZE        , BiosGetMemorySize       );
 528     RegisterBiosInt32(BIOS_MISC_INTERRUPT     , BiosMiscService         );
 529     RegisterBiosInt32(BIOS_ROM_BASIC          , BiosRomBasic            );
 530     RegisterBiosInt32(BIOS_BOOTSTRAP_LOADER   , BiosBootstrapLoader     );
 531     RegisterBiosInt32(BIOS_TIME_INTERRUPT     , BiosTimeService         );
 532     RegisterBiosInt32(BIOS_SYS_TIMER_INTERRUPT, BiosSystemTimerInterrupt);
 533
 534     /* Some interrupts are in fact addresses to tables */
 535     ((PULONG)BaseAddress)[0x1E] = (ULONG)NULL;
 536     ((PULONG)BaseAddress)[0x41] = (ULONG)NULL;
 537     ((PULONG)BaseAddress)[0x46] = (ULONG)NULL;
 538     ((PULONG)BaseAddress)[0x48] = (ULONG)NULL;
 539     ((PULONG)BaseAddress)[0x49] = (ULONG)NULL;
 540 }
 541
 542 static VOID InitializeBiosData(VOID)
 543 {
 544     UCHAR Low, High;
 545
 546     /* Initialize the BDA contents */
 547     RtlZeroMemory(Bda, sizeof(*Bda));
 548     Bda->EquipmentList = BIOS_EQUIPMENT_LIST;
 549
 550     /*
 551      * Retrieve the conventional memory size
 552      * in kB from CMOS, typically 640 kB.
 553      */
 554     IOWriteB(CMOS_ADDRESS_PORT, CMOS_REG_BASE_MEMORY_LOW);
 555     Low  = IOReadB(CMOS_DATA_PORT);
 556     IOWriteB(CMOS_ADDRESS_PORT, CMOS_REG_BASE_MEMORY_HIGH);
 557     High = IOReadB(CMOS_DATA_PORT);
 558     Bda->MemorySize = MAKEWORD(Low, High);
 559 }
 560
 561 static VOID InitializeBiosInfo(VOID)
 562 {
 563     RtlZeroMemory(Bct, sizeof(*Bct));
 564
 565     Bct->Length     = sizeof(*Bct);
 566     Bct->Model      = BIOS_MODEL;
 567     Bct->SubModel   = BIOS_SUBMODEL;
 568     Bct->Revision   = BIOS_REVISION;
 569     Bct->Feature[0] = 0x70; // At the moment we don't support "wait for external event (INT 15/AH=41h)", we also don't have any "extended BIOS area allocated (usually at top of RAM)"; see http://www.ctyme.com/intr/rb-1594.htm#Table510
 570     Bct->Feature[1] = 0x00; // We don't support anything from here; see http://www.ctyme.com/intr/rb-1594.htm#Table511
 571     Bct->Feature[2] = 0x00;
 572     Bct->Feature[3] = 0x00;
 573     Bct->Feature[4] = 0x00;
 574 }
 575
 576
 577
 578 /*
 579  * The BIOS POST (Power On-Self Test)
 580  */
 581 VOID
 582 Bios32Post(VOID)
 583 {
 584     BOOLEAN Success;
 585
 586     DPRINT1("Bios32Post\n");
 587
 588     /* Initialize the stack */
 589     // That's what says IBM... (stack at 30:00FF going downwards)
 590     // setSS(0x0000);
 591     // setSP(0x0400);
 592     setSS(0x0050);  // Stack at 50:0400, going downwards
 593     setSP(0x0400);
 594
 595     /* Set data segment */
 596     setDS(BDA_SEGMENT);
 597
 598     /* Initialize the BDA and the BIOS ROM Information */
 599     InitializeBiosData();
 600     InitializeBiosInfo();
 601
 602     /*
 603      * Initialize IVT and hardware
 604      */
 605
 606     /* Register the BIOS 32-bit Interrupts */
 607     InitializeBiosInt32();
 608
 609     /* Initialize platform hardware (PIC/PIT chips, ...) */
 610     BiosHwSetup();
 611
 612     /* Initialize the Keyboard, Video and Mouse BIOS */
 613     if (!KbdBios32Initialize() || !VidBios32Initialize() || !MouseBios32Initialize())
 614     {
 615         // return FALSE;
 616
 617         /* Stop the VDM */
 618         EmulatorTerminate();
 619         return;
 620     }
 621
 622 #if 0
 623     /* Initialize the Keyboard and Video BIOS */
 624     if (!KbdBiosInitialize() || !VidBiosInitialize())
 625     {
 626         /* Stop the VDM */
 627         EmulatorTerminate();
 628         return;
 629     }
 630 #endif
 631
 632     ///////////// MUST BE DONE AFTER IVT INITIALIZATION !! /////////////////////
 633
 634     /* Load some ROMs */
 635     Success = LoadRom("boot.bin", (PVOID)0xE0000, NULL);
 636     DPRINT1("Test ROM loading %s ; GetLastError() = %u\n", Success ? "succeeded" : "failed", GetLastError());
 637
 638     SearchAndInitRoms(&BiosContext);
 639
 640     /*
 641      * End of the 32-bit POST portion. We then fall back into 16-bit where
 642      * the rest of the POST code is executed, typically calling INT 19h
 643      * to boot up the OS.
 644      */
 645 }
 646
 647 static VOID WINAPI Bios32ResetBop(LPWORD Stack)
 648 {
 649     DPRINT1("Bios32ResetBop\n");
 650
 651     /* Disable interrupts */
 652     setIF(0);
 653
 654     // FIXME: Check the word at 0040h:0072h (Bda->SoftReset) and do one of the
 655     // following actions:
 656     // - if the word is 1234h, perform a warm reboot (aka. Ctrl-Alt-Del);
 657     // - if the word is 0000h, perform a cold reboot (aka. Reset).
 658
 659     /* Do the POST */
 660     Bios32Post();
 661
 662     /* Enable interrupts */
 663     setIF(1);
 664 }
 665
 666
 667 /* PUBLIC FUNCTIONS ***********************************************************/
 668
 669 BOOLEAN Bios32Initialize(VOID)
 670 {
 671     /*
 672      * Initialize BIOS32 static data
 673      */
 674
 675     /* Bootstrap code */
 676     RtlCopyMemory(SEG_OFF_TO_PTR(0xF000, 0xE05B), PostCode , sizeof(PostCode ));
 677     RtlCopyMemory(SEG_OFF_TO_PTR(0xF000, 0xFFF0), Bootstrap, sizeof(Bootstrap));
 678
 679     /* System BIOS Copyright */
 680     RtlCopyMemory(SEG_OFF_TO_PTR(0xF000, 0xE000), BiosCopyright, sizeof(BiosCopyright)-1);
 681
 682     /* System BIOS Version */
 683     RtlCopyMemory(SEG_OFF_TO_PTR(0xF000, 0xE080), BiosVersion, sizeof(BiosVersion)-1);
 684     // FIXME: or E061, or E100 ??
 685
 686     /* System BIOS Date */
 687     RtlCopyMemory(SEG_OFF_TO_PTR(0xF000, 0xFFF5), BiosDate, sizeof(BiosDate)-1);
 688
 689     /* System BIOS Model (same as Bct->Model) */
 690     *(PBYTE)(SEG_OFF_TO_PTR(0xF000, 0xFFFE)) = BIOS_MODEL;
 691
 692     /* Redefine our POST function */
 693     RegisterBop(BOP_RESET, Bios32ResetBop);
 694
 695     /* We are done */
 696     return TRUE;
 697 }
 698
 699 VOID Bios32Cleanup(VOID)
 700 {
 701     MouseBios32Cleanup();
 702     VidBios32Cleanup();
 703     KbdBios32Cleanup();
 704 }
 705
 706 /* EOF */