reactos/subsystems/ntvdm/emulator.c

   1 /*
   2  * COPYRIGHT:       GPL - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            emulator.c
   5  * PURPOSE:         Minimal x86 machine emulator for the VDM
   6  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #define NDEBUG
  12
  13 #include "emulator.h"
  14 #include "callback.h"
  15
  16 #include "clock.h"
  17 #include "bios/rom.h"
  18 #include "hardware/cmos.h"
  19 #include "hardware/keyboard.h"
  20 #include "hardware/mouse.h"
  21 #include "hardware/pic.h"
  22 #include "hardware/ps2.h"
  23 #include "hardware/speaker.h"
  24 #include "hardware/timer.h"
  25 #include "hardware/vga.h"
  26
  27 #include "bop.h"
  28 #include "vddsup.h"
  29 #include "io.h"
  30
  31 #include <isvbop.h>
  32
  33 /* PRIVATE VARIABLES **********************************************************/
  34
  35 FAST486_STATE EmulatorContext;
  36 BOOLEAN CpuSimulate = FALSE;
  37
  38 /* No more than 'MaxCpuCallLevel' recursive CPU calls are allowed */
  39 static const INT MaxCpuCallLevel = 32;
  40 static INT CpuCallLevel = 0;
  41
  42 LPVOID  BaseAddress = NULL;
  43 BOOLEAN VdmRunning  = TRUE;
  44
  45 static BOOLEAN A20Line   = FALSE;
  46 static BYTE Port61hState = 0x00;
  47
  48 static HANDLE InputThread = NULL;
  49
  50 LPCWSTR ExceptionName[] =
  51 {
  52     L"Division By Zero",
  53     L"Debug",
  54     L"Unexpected Error",
  55     L"Breakpoint",
  56     L"Integer Overflow",
  57     L"Bound Range Exceeded",
  58     L"Invalid Opcode",
  59     L"FPU Not Available"
  60 };
  61
  62 /* BOP Identifiers */
  63 #define BOP_DEBUGGER    0x56    // Break into the debugger from a 16-bit app
  64
  65 /* PRIVATE FUNCTIONS **********************************************************/
  66
  67 VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
  68 {
  69     UNREFERENCED_PARAMETER(State);
  70
  71     // BIG HACK!!!! To make BIOS images working correctly,
  72     // until Aleksander rewrites memory management!!
  73     if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
  74
  75     /* If the A20 line is disabled, mask bit 20 */
  76     if (!A20Line) Address &= ~(1 << 20);
  77
  78     /* Make sure the requested address is valid */
  79     if ((Address + Size) >= MAX_ADDRESS) return;
  80
  81     /*
  82      * Check if we are going to read the VGA memory and
  83      * copy it into the virtual address space if needed.
  84      */
  85     if (((Address + Size) >= VgaGetVideoBaseAddress())
  86         && (Address < VgaGetVideoLimitAddress()))
  87     {
  88         DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
  89         DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
  90                            - VgaAddress + 1;
  91         LPBYTE DestBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);
  92
  93         /* Read from the VGA memory */
  94         VgaReadMemory(VgaAddress, DestBuffer, ActualSize);
  95     }
  96
  97     /* Read the data from the virtual address space and store it in the buffer */
  98     RtlCopyMemory(Buffer, REAL_TO_PHYS(Address), Size);
  99 }
 100
 101 VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
 102 {
 103     UNREFERENCED_PARAMETER(State);
 104
 105     // BIG HACK!!!! To make BIOS images working correctly,
 106     // until Aleksander rewrites memory management!!
 107     if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
 108
 109     /* If the A20 line is disabled, mask bit 20 */
 110     if (!A20Line) Address &= ~(1 << 20);
 111
 112     /* Make sure the requested address is valid */
 113     if ((Address + Size) >= MAX_ADDRESS) return;
 114
 115     /* Make sure we don't write to the ROM area */
 116     if ((Address + Size) >= ROM_AREA_START && (Address < ROM_AREA_END)) return;
 117
 118     /* Read the data from the buffer and store it in the virtual address space */
 119     RtlCopyMemory(REAL_TO_PHYS(Address), Buffer, Size);
 120
 121     /*
 122      * Check if we modified the VGA memory.
 123      */
 124     if (((Address + Size) >= VgaGetVideoBaseAddress())
 125         && (Address < VgaGetVideoLimitAddress()))
 126     {
 127         DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
 128         DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
 129                            - VgaAddress + 1;
 130         LPBYTE SrcBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);
 131
 132         /* Write to the VGA memory */
 133         VgaWriteMemory(VgaAddress, SrcBuffer, ActualSize);
 134     }
 135 }
 136
 137 UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
 138 {
 139     UNREFERENCED_PARAMETER(State);
 140
 141     /* Get the interrupt number from the PIC */
 142     return PicGetInterrupt();
 143 }
 144
 145 VOID EmulatorException(BYTE ExceptionNumber, LPWORD Stack)
 146 {
 147     WORD CodeSegment, InstructionPointer;
 148     PBYTE Opcode;
 149
 150     ASSERT(ExceptionNumber < 8);
 151
 152     /* Get the CS:IP */
 153     InstructionPointer = Stack[STACK_IP];
 154     CodeSegment = Stack[STACK_CS];
 155     Opcode = (PBYTE)SEG_OFF_TO_PTR(CodeSegment, InstructionPointer);
 156
 157     /* Display a message to the user */
 158     DisplayMessage(L"Exception: %s occured at %04X:%04X\n"
 159                    L"Opcode: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X",
 160                    ExceptionName[ExceptionNumber],
 161                    CodeSegment,
 162                    InstructionPointer,
 163                    Opcode[0],
 164                    Opcode[1],
 165                    Opcode[2],
 166                    Opcode[3],
 167                    Opcode[4],
 168                    Opcode[5],
 169                    Opcode[6],
 170                    Opcode[7],
 171                    Opcode[8],
 172                    Opcode[9]);
 173
 174     /* Stop the VDM */
 175     EmulatorTerminate();
 176     return;
 177 }
 178
 179 // FIXME: This function assumes 16-bit mode!!!
 180 VOID EmulatorExecute(WORD Segment, WORD Offset)
 181 {
 182     /* Tell Fast486 to move the instruction pointer */
 183     Fast486ExecuteAt(&EmulatorContext, Segment, Offset);
 184 }
 185
 186 VOID EmulatorStep(VOID)
 187 {
 188     /* Dump the state for debugging purposes */
 189     // Fast486DumpState(&EmulatorContext);
 190
 191     /* Execute the next instruction */
 192     Fast486StepInto(&EmulatorContext);
 193 }
 194
 195 VOID EmulatorSimulate(VOID)
 196 {
 197     if (CpuCallLevel > MaxCpuCallLevel)
 198     {
 199         DisplayMessage(L"Too many CPU levels of recursion (%d, expected maximum %d)",
 200                        CpuCallLevel, MaxCpuCallLevel);
 201
 202         /* Stop the VDM */
 203         EmulatorTerminate();
 204         return;
 205     }
 206     CpuCallLevel++;
 207
 208     CpuSimulate = TRUE;
 209     while (VdmRunning && CpuSimulate) ClockUpdate();
 210
 211     CpuCallLevel--;
 212     if (CpuCallLevel < 0) CpuCallLevel = 0;
 213
 214     /* This takes into account for reentrance */
 215     CpuSimulate = TRUE;
 216 }
 217
 218 VOID EmulatorUnsimulate(VOID)
 219 {
 220     /* Stop simulation */
 221     CpuSimulate = FALSE;
 222 }
 223
 224 VOID EmulatorTerminate(VOID)
 225 {
 226     /* Stop the VDM */
 227     VdmRunning = FALSE;
 228 }
 229
 230 VOID EmulatorInterrupt(BYTE Number)
 231 {
 232     /* Call the Fast486 API */
 233     Fast486Interrupt(&EmulatorContext, Number);
 234 }
 235
 236 VOID EmulatorInterruptSignal(VOID)
 237 {
 238     /* Call the Fast486 API */
 239     Fast486InterruptSignal(&EmulatorContext);
 240 }
 241
 242 VOID EmulatorSetA20(BOOLEAN Enabled)
 243 {
 244     A20Line = Enabled;
 245 }
 246
 247 static VOID WINAPI EmulatorDebugBreakBop(LPWORD Stack)
 248 {
 249     DPRINT1("NTVDM: BOP_DEBUGGER\n");
 250     DebugBreak();
 251 }
 252
 253 static VOID WINAPI EmulatorUnsimulateBop(LPWORD Stack)
 254 {
 255     EmulatorUnsimulate();
 256 }
 257
 258 static BYTE WINAPI Port61hRead(ULONG Port)
 259 {
 260     return Port61hState;
 261 }
 262
 263 static VOID WINAPI Port61hWrite(ULONG Port, BYTE Data)
 264 {
 265     // BOOLEAN SpeakerStateChange = FALSE;
 266     BYTE OldPort61hState = Port61hState;
 267
 268     /* Only the four lowest bytes can be written */
 269     Port61hState = (Port61hState & 0xF0) | (Data & 0x0F);
 270
 271     if ((OldPort61hState ^ Port61hState) & 0x01)
 272     {
 273         DPRINT("PIT 2 Gate %s\n", Port61hState & 0x01 ? "on" : "off");
 274         PitSetGate(2, !!(Port61hState & 0x01));
 275         // SpeakerStateChange = TRUE;
 276     }
 277
 278     if ((OldPort61hState ^ Port61hState) & 0x02)
 279     {
 280         /* There were some change for the speaker... */
 281         DPRINT("Speaker %s\n", Port61hState & 0x02 ? "on" : "off");
 282         // SpeakerStateChange = TRUE;
 283     }
 284     // if (SpeakerStateChange) SpeakerChange();
 285     SpeakerChange();
 286 }
 287
 288 static VOID WINAPI PitChan0Out(LPVOID Param, BOOLEAN State)
 289 {
 290     if (State)
 291     {
 292         DPRINT("PicInterruptRequest\n");
 293         PicInterruptRequest(0); // Raise IRQ 0
 294     }
 295     // else < Lower IRQ 0 >
 296 }
 297
 298 static VOID WINAPI PitChan1Out(LPVOID Param, BOOLEAN State)
 299 {
 300 #if 0
 301     if (State)
 302     {
 303         /* Set bit 4 of Port 61h */
 304         Port61hState |= 1 << 4;
 305     }
 306     else
 307     {
 308         /* Clear bit 4 of Port 61h */
 309         Port61hState &= ~(1 << 4);
 310     }
 311 #else
 312     Port61hState = (Port61hState & 0xEF) | (State << 4);
 313 #endif
 314 }
 315
 316 static VOID WINAPI PitChan2Out(LPVOID Param, BOOLEAN State)
 317 {
 318     BYTE OldPort61hState = Port61hState;
 319
 320 #if 0
 321     if (State)
 322     {
 323         /* Set bit 5 of Port 61h */
 324         Port61hState |= 1 << 5;
 325     }
 326     else
 327     {
 328         /* Clear bit 5 of Port 61h */
 329         Port61hState &= ~(1 << 5);
 330     }
 331 #else
 332     Port61hState = (Port61hState & 0xDF) | (State << 5);
 333 #endif
 334
 335     if ((OldPort61hState ^ Port61hState) & 0x20)
 336     {
 337         DPRINT("PitChan2Out -- Port61hState changed\n");
 338         SpeakerChange();
 339     }
 340 }
 341
 342
 343 static DWORD
 344 WINAPI
 345 PumpConsoleInput(LPVOID Parameter)
 346 {
 347     HANDLE ConsoleInput = (HANDLE)Parameter;
 348     INPUT_RECORD InputRecord;
 349     DWORD Count;
 350
 351     while (VdmRunning)
 352     {
 353         /* Make sure the task event is signaled */
 354         WaitForSingleObject(VdmTaskEvent, INFINITE);
 355
 356         /* Wait for an input record */
 357         if (!ReadConsoleInput(ConsoleInput, &InputRecord, 1, &Count))
 358         {
 359             DWORD LastError = GetLastError();
 360             DPRINT1("Error reading console input (0x%p, %lu) - Error %lu\n", ConsoleInput, Count, LastError);
 361             return LastError;
 362         }
 363
 364         ASSERT(Count != 0);
 365
 366         /* Check the event type */
 367         switch (InputRecord.EventType)
 368         {
 369             /*
 370              * Hardware events
 371              */
 372             case KEY_EVENT:
 373                 KeyboardEventHandler(&InputRecord.Event.KeyEvent);
 374                 break;
 375
 376             case MOUSE_EVENT:
 377                 MouseEventHandler(&InputRecord.Event.MouseEvent);
 378                 break;
 379
 380             case WINDOW_BUFFER_SIZE_EVENT:
 381                 ScreenEventHandler(&InputRecord.Event.WindowBufferSizeEvent);
 382                 break;
 383
 384             /*
 385              * Interface events
 386              */
 387             case MENU_EVENT:
 388                 MenuEventHandler(&InputRecord.Event.MenuEvent);
 389                 break;
 390
 391             case FOCUS_EVENT:
 392                 FocusEventHandler(&InputRecord.Event.FocusEvent);
 393                 break;
 394
 395             default:
 396                 break;
 397         }
 398     }
 399
 400     return 0;
 401 }
 402
 403 static VOID EnableExtraHardware(HANDLE ConsoleInput)
 404 {
 405     DWORD ConInMode;
 406
 407     if (GetConsoleMode(ConsoleInput, &ConInMode))
 408     {
 409 #if 0
 410         // GetNumberOfConsoleMouseButtons();
 411         // GetSystemMetrics(SM_CMOUSEBUTTONS);
 412         // GetSystemMetrics(SM_MOUSEPRESENT);
 413         if (MousePresent)
 414         {
 415 #endif
 416             /* Support mouse input events if there is a mouse on the system */
 417             ConInMode |= ENABLE_MOUSE_INPUT;
 418 #if 0
 419         }
 420         else
 421         {
 422             /* Do not support mouse input events if there is no mouse on the system */
 423             ConInMode &= ~ENABLE_MOUSE_INPUT;
 424         }
 425 #endif
 426
 427         SetConsoleMode(ConsoleInput, ConInMode);
 428     }
 429 }
 430
 431 /* PUBLIC FUNCTIONS ***********************************************************/
 432
 433 static VOID
 434 DumpMemoryRaw(HANDLE hFile)
 435 {
 436     PVOID  Buffer;
 437     SIZE_T Size;
 438
 439     /* Dump the VM memory */
 440     SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
 441     Buffer = REAL_TO_PHYS(NULL);
 442     Size   = MAX_ADDRESS - (ULONG_PTR)(NULL);
 443     WriteFile(hFile, Buffer, Size, &Size, NULL);
 444 }
 445
 446 static VOID
 447 DumpMemoryTxt(HANDLE hFile)
 448 {
 449 #define LINE_SIZE   75 + 2
 450     ULONG  i;
 451     PBYTE  Ptr1, Ptr2;
 452     CHAR   LineBuffer[LINE_SIZE];
 453     PCHAR  Line;
 454     SIZE_T LineSize;
 455
 456     /* Dump the VM memory */
 457     SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
 458     Ptr1 = Ptr2 = REAL_TO_PHYS(NULL);
 459     while (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr1) > 0)
 460     {
 461         Ptr1 = Ptr2;
 462         Line = LineBuffer;
 463
 464         /* Print the address */
 465         Line += snprintf(Line, LINE_SIZE + LineBuffer - Line, "%08x ", PHYS_TO_REAL(Ptr1));
 466
 467         /* Print up to 16 bytes... */
 468
 469         /* ... in hexadecimal form first... */
 470         i = 0;
 471         while (i++ <= 0x0F && (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr1) > 0))
 472         {
 473             Line += snprintf(Line, LINE_SIZE + LineBuffer - Line, " %02x", *Ptr1);
 474             ++Ptr1;
 475         }
 476
 477         /* ... align with spaces if needed... */
 478         RtlFillMemory(Line, 0x0F + 4 - i, ' ');
 479         Line += 0x0F + 4 - i;
 480
 481         /* ... then in character form. */
 482         i = 0;
 483         while (i++ <= 0x0F && (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr2) > 0))
 484         {
 485             *Line++ = ((*Ptr2 >= 0x20 && *Ptr2 <= 0x7E) || (*Ptr2 >= 0x80 && *Ptr2 < 0xFF) ? *Ptr2 : '.');
 486             ++Ptr2;
 487         }
 488
 489         /* Newline */
 490         *Line++ = '\r';
 491         *Line++ = '\n';
 492
 493         /* Finally write the line to the file */
 494         LineSize = Line - LineBuffer;
 495         WriteFile(hFile, LineBuffer, LineSize, &LineSize, NULL);
 496     }
 497 }
 498
 499 VOID DumpMemory(BOOLEAN TextFormat)
 500 {
 501     static ULONG DumpNumber = 0;
 502
 503     HANDLE hFile;
 504     WCHAR  FileName[MAX_PATH];
 505
 506     /* Build a suitable file name */
 507     _snwprintf(FileName, MAX_PATH,
 508                L"memdump%lu.%s",
 509                DumpNumber,
 510                TextFormat ? L"txt" : L"dat");
 511     ++DumpNumber;
 512
 513     DPRINT1("Creating memory dump file '%S'...\n", FileName);
 514
 515     /* Always create the dump file */
 516     hFile = CreateFileW(FileName,
 517                         GENERIC_WRITE,
 518                         0,
 519                         NULL,
 520                         CREATE_ALWAYS,
 521                         FILE_ATTRIBUTE_NORMAL,
 522                         NULL);
 523
 524     if (hFile == INVALID_HANDLE_VALUE)
 525     {
 526         DPRINT1("Error when creating '%S' for memory dumping, GetLastError() = %u\n",
 527                 FileName, GetLastError());
 528         return;
 529     }
 530
 531     /* Dump the VM memory in the chosen format */
 532     if (TextFormat)
 533         DumpMemoryTxt(hFile);
 534     else
 535         DumpMemoryRaw(hFile);
 536
 537     /* Close the file */
 538     CloseHandle(hFile);
 539
 540     DPRINT1("Memory dump done\n");
 541 }
 542
 543 BOOLEAN EmulatorInitialize(HANDLE ConsoleInput, HANDLE ConsoleOutput)
 544 {
 545     /* Allocate memory for the 16-bit address space */
 546     BaseAddress = HeapAlloc(GetProcessHeap(), /*HEAP_ZERO_MEMORY*/ 0, MAX_ADDRESS);
 547     if (BaseAddress == NULL)
 548     {
 549         wprintf(L"FATAL: Failed to allocate VDM memory.\n");
 550         return FALSE;
 551     }
 552     // For diagnostics purposes!!
 553     FillMemory(BaseAddress, MAX_ADDRESS, 0xFF);
 554
 555     /* Initialize I/O ports */
 556     /* Initialize RAM */
 557
 558     /* Initialize the internal clock */
 559     if (!ClockInitialize())
 560     {
 561         wprintf(L"FATAL: Failed to initialize the clock\n");
 562         return FALSE;
 563     }
 564
 565     /* Initialize the CPU */
 566     Fast486Initialize(&EmulatorContext,
 567                       EmulatorReadMemory,
 568                       EmulatorWriteMemory,
 569                       EmulatorReadIo,
 570                       EmulatorWriteIo,
 571                       NULL,
 572                       EmulatorBiosOperation,
 573                       EmulatorIntAcknowledge,
 574                       NULL /* TODO: Use a TLB */);
 575
 576     /* Initialize DMA */
 577
 578     /* Initialize the PIC, the PIT, the CMOS and the PC Speaker */
 579     PicInitialize();
 580     PitInitialize();
 581     CmosInitialize();
 582     SpeakerInitialize();
 583
 584     /* Set output functions */
 585     PitSetOutFunction(0, NULL, PitChan0Out);
 586     PitSetOutFunction(1, NULL, PitChan1Out);
 587     PitSetOutFunction(2, NULL, PitChan2Out);
 588
 589     /* Register the I/O Ports */
 590     RegisterIoPort(CONTROL_SYSTEM_PORT61H, Port61hRead, Port61hWrite);
 591
 592     /* Set the console input mode */
 593     // FIXME: Activate ENABLE_WINDOW_INPUT when we will want to perform actions
 594     // upon console window events (screen buffer resize, ...).
 595     SetConsoleMode(ConsoleInput, ENABLE_PROCESSED_INPUT /* | ENABLE_WINDOW_INPUT */);
 596     // SetConsoleMode(ConsoleOutput, ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
 597
 598     /**/EnableExtraHardware(ConsoleInput);/**/
 599
 600     /* Initialize the PS/2 port */
 601     PS2Initialize();
 602
 603     /* Initialize the keyboard and mouse and connect them to their PS/2 ports */
 604     KeyboardInit(0);
 605     MouseInit(1);
 606
 607     /**************** ATTACH INPUT WITH CONSOLE *****************/
 608     /* Start the input thread */
 609     InputThread = CreateThread(NULL, 0, &PumpConsoleInput, ConsoleInput, 0, NULL);
 610     if (InputThread == NULL)
 611     {
 612         DisplayMessage(L"Failed to create the console input thread.");
 613         return FALSE;
 614     }
 615     /************************************************************/
 616
 617     /* Initialize the VGA */
 618     if (!VgaInitialize(ConsoleOutput))
 619     {
 620         DisplayMessage(L"Failed to initialize VGA support.");
 621         return FALSE;
 622     }
 623
 624     /* Initialize the software callback system and register the emulator BOPs */
 625     InitializeCallbacks();
 626     RegisterBop(BOP_DEBUGGER  , EmulatorDebugBreakBop);
 627     RegisterBop(BOP_UNSIMULATE, EmulatorUnsimulateBop);
 628
 629     /* Initialize VDD support */
 630     VDDSupInitialize();
 631
 632     return TRUE;
 633 }
 634
 635 VOID EmulatorCleanup(VOID)
 636 {
 637     VgaCleanup();
 638
 639     /* Close the input thread handle */
 640     if (InputThread != NULL) CloseHandle(InputThread);
 641     InputThread = NULL;
 642
 643     PS2Cleanup();
 644
 645     SpeakerCleanup();
 646     CmosCleanup();
 647     // PitCleanup();
 648     // PicCleanup();
 649
 650     // Fast486Cleanup();
 651
 652     /* Free the memory allocated for the 16-bit address space */
 653     if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
 654 }
 655
 656
 657
 658 VOID
 659 WINAPI
 660 VDDSimulate16(VOID)
 661 {
 662     EmulatorSimulate();
 663 }
 664
 665 VOID
 666 WINAPI
 667 VDDTerminateVDM(VOID)
 668 {
 669     /* Stop the VDM */
 670     EmulatorTerminate();
 671 }
 672
 673 PBYTE
 674 WINAPI
 675 Sim32pGetVDMPointer(IN ULONG   Address,
 676                     IN BOOLEAN ProtectedMode)
 677 {
 678     // FIXME
 679     UNREFERENCED_PARAMETER(ProtectedMode);
 680
 681     /*
 682      * HIWORD(Address) == Segment  (if ProtectedMode == FALSE)
 683      *                 or Selector (if ProtectedMode == TRUE )
 684      * LOWORD(Address) == Offset
 685      */
 686     return (PBYTE)FAR_POINTER(Address);
 687 }
 688
 689 PBYTE
 690 WINAPI
 691 MGetVdmPointer(IN ULONG   Address,
 692                IN ULONG   Size,
 693                IN BOOLEAN ProtectedMode)
 694 {
 695     UNREFERENCED_PARAMETER(Size);
 696     return Sim32pGetVDMPointer(Address, ProtectedMode);
 697 }
 698
 699 PVOID
 700 WINAPI
 701 VdmMapFlat(IN USHORT   Segment,
 702            IN ULONG    Offset,
 703            IN VDM_MODE Mode)
 704 {
 705     // FIXME
 706     UNREFERENCED_PARAMETER(Mode);
 707
 708     return SEG_OFF_TO_PTR(Segment, Offset);
 709 }
 710
 711 BOOL
 712 WINAPI
 713 VdmFlushCache(IN USHORT   Segment,
 714               IN ULONG    Offset,
 715               IN ULONG    Size,
 716               IN VDM_MODE Mode)
 717 {
 718     // FIXME
 719     UNIMPLEMENTED;
 720     return TRUE;
 721 }
 722
 723 BOOL
 724 WINAPI
 725 VdmUnmapFlat(IN USHORT   Segment,
 726              IN ULONG    Offset,
 727              IN PVOID    Buffer,
 728              IN VDM_MODE Mode)
 729 {
 730     // FIXME
 731     UNIMPLEMENTED;
 732     return TRUE;
 733 }
 734
 735 /* EOF */