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
  15 #include "cpu/callback.h"
  16 #include "cpu/cpu.h"
  17 #include "cpu/bop.h"
  18 #include <isvbop.h>
  19
  20 #include "int32.h"
  21
  22 #include "clock.h"
  23 #include "bios/rom.h"
  24 #include "hardware/cmos.h"
  25 #include "hardware/keyboard.h"
  26 #include "hardware/mouse.h"
  27 #include "hardware/pic.h"
  28 #include "hardware/ps2.h"
  29 #include "hardware/speaker.h"
  30 #include "hardware/timer.h"
  31 #include "hardware/vga.h"
  32
  33 #include "vddsup.h"
  34 #include "io.h"
  35
  36 /* PRIVATE VARIABLES **********************************************************/
  37
  38 LPVOID  BaseAddress = NULL;
  39 BOOLEAN VdmRunning  = TRUE;
  40
  41 static BOOLEAN A20Line   = FALSE;
  42 static BYTE Port61hState = 0x00;
  43
  44 static HANDLE InputThread = NULL;
  45
  46 LPCWSTR ExceptionName[] =
  47 {
  48     L"Division By Zero",
  49     L"Debug",
  50     L"Unexpected Error",
  51     L"Breakpoint",
  52     L"Integer Overflow",
  53     L"Bound Range Exceeded",
  54     L"Invalid Opcode",
  55     L"FPU Not Available"
  56 };
  57
  58 /* BOP Identifiers */
  59 #define BOP_DEBUGGER    0x56    // Break into the debugger from a 16-bit app
  60
  61 /* PRIVATE FUNCTIONS **********************************************************/
  62
  63 static inline VOID
  64 EmulatorMoveMemory(OUT VOID UNALIGNED *Destination,
  65                    IN const VOID UNALIGNED *Source,
  66                    IN SIZE_T Length)
  67 {
  68 #if 1
  69     /*
  70      * We use a switch here to detect small moves of memory, as these
  71      * constitute the bulk of our moves.
  72      * Using RtlMoveMemory for all these small moves would be slow otherwise.
  73      */
  74     switch (Length)
  75     {
  76         case 0:
  77             return;
  78
  79         case sizeof(UCHAR):
  80             *(PUCHAR)Destination = *(PUCHAR)Source;
  81             return;
  82
  83         case sizeof(USHORT):
  84             *(PUSHORT)Destination = *(PUSHORT)Source;
  85             return;
  86
  87         case sizeof(ULONG):
  88             *(PULONG)Destination = *(PULONG)Source;
  89             return;
  90
  91         case sizeof(ULONGLONG):
  92             *(PULONGLONG)Destination = *(PULONGLONG)Source;
  93             return;
  94
  95         default:
  96 #if defined(__GNUC__)
  97             __builtin_memmove(Destination, Source, Length);
  98 #else
  99             RtlMoveMemory(Destination, Source, Length);
 100 #endif
 101     }
 102
 103 #else // defined(_MSC_VER)
 104
 105     PUCHAR Dest = (PUCHAR)Destination;
 106     PUCHAR Src  = (PUCHAR)Source;
 107
 108     SIZE_T Count, NewSize = Length;
 109
 110     /* Move dword */
 111     Count   = NewSize >> 2; // NewSize / sizeof(ULONG);
 112     NewSize = NewSize  & 3; // NewSize % sizeof(ULONG);
 113     __movsd(Dest, Src, Count);
 114     Dest += Count << 2; // Count * sizeof(ULONG);
 115     Src  += Count << 2;
 116
 117     /* Move word */
 118     Count   = NewSize >> 1; // NewSize / sizeof(USHORT);
 119     NewSize = NewSize  & 1; // NewSize % sizeof(USHORT);
 120     __movsw(Dest, Src, Count);
 121     Dest += Count << 1; // Count * sizeof(USHORT);
 122     Src  += Count << 1;
 123
 124     /* Move byte */
 125     Count   = NewSize; // NewSize / sizeof(UCHAR);
 126     // NewSize = NewSize; // NewSize % sizeof(UCHAR);
 127     __movsb(Dest, Src, Count);
 128
 129 #endif
 130 }
 131
 132 VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
 133 {
 134     UNREFERENCED_PARAMETER(State);
 135
 136     // BIG HACK!!!! To make BIOS images working correctly,
 137     // until Aleksander rewrites memory management!!
 138     if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
 139
 140     /* If the A20 line is disabled, mask bit 20 */
 141     if (!A20Line) Address &= ~(1 << 20);
 142
 143     /* Make sure the requested address is valid */
 144     if ((Address + Size) >= MAX_ADDRESS) return;
 145
 146     /*
 147      * Check if we are going to read the VGA memory and
 148      * copy it into the virtual address space if needed.
 149      */
 150     if (((Address + Size) >= VgaGetVideoBaseAddress())
 151         && (Address < VgaGetVideoLimitAddress()))
 152     {
 153         DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
 154         DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
 155                            - VgaAddress + 1;
 156         LPBYTE DestBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);
 157
 158         /* Read from the VGA memory */
 159         VgaReadMemory(VgaAddress, DestBuffer, ActualSize);
 160     }
 161
 162     /* Read the data from the virtual address space and store it in the buffer */
 163     EmulatorMoveMemory(Buffer, REAL_TO_PHYS(Address), Size);
 164 }
 165
 166 VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
 167 {
 168     UNREFERENCED_PARAMETER(State);
 169
 170     // BIG HACK!!!! To make BIOS images working correctly,
 171     // until Aleksander rewrites memory management!!
 172     if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
 173
 174     /* If the A20 line is disabled, mask bit 20 */
 175     if (!A20Line) Address &= ~(1 << 20);
 176
 177     /* Make sure the requested address is valid */
 178     if ((Address + Size) >= MAX_ADDRESS) return;
 179
 180     /* Make sure we don't write to the ROM area */
 181     if ((Address + Size) >= ROM_AREA_START && (Address < ROM_AREA_END)) return;
 182
 183     /* Read the data from the buffer and store it in the virtual address space */
 184     EmulatorMoveMemory(REAL_TO_PHYS(Address), Buffer, Size);
 185
 186     /*
 187      * Check if we modified the VGA memory.
 188      */
 189     if (((Address + Size) >= VgaGetVideoBaseAddress())
 190         && (Address < VgaGetVideoLimitAddress()))
 191     {
 192         DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
 193         DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
 194                            - VgaAddress + 1;
 195         LPBYTE SrcBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);
 196
 197         /* Write to the VGA memory */
 198         VgaWriteMemory(VgaAddress, SrcBuffer, ActualSize);
 199     }
 200 }
 201
 202 UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
 203 {
 204     UNREFERENCED_PARAMETER(State);
 205
 206     /* Get the interrupt number from the PIC */
 207     return PicGetInterrupt();
 208 }
 209
 210 VOID EmulatorException(BYTE ExceptionNumber, LPWORD Stack)
 211 {
 212     WORD CodeSegment, InstructionPointer;
 213     PBYTE Opcode;
 214
 215     ASSERT(ExceptionNumber < 8);
 216
 217     /* Get the CS:IP */
 218     InstructionPointer = Stack[STACK_IP];
 219     CodeSegment = Stack[STACK_CS];
 220     Opcode = (PBYTE)SEG_OFF_TO_PTR(CodeSegment, InstructionPointer);
 221
 222     /* Display a message to the user */
 223     DisplayMessage(L"Exception: %s occured at %04X:%04X\n"
 224                    L"Opcode: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X",
 225                    ExceptionName[ExceptionNumber],
 226                    CodeSegment,
 227                    InstructionPointer,
 228                    Opcode[0],
 229                    Opcode[1],
 230                    Opcode[2],
 231                    Opcode[3],
 232                    Opcode[4],
 233                    Opcode[5],
 234                    Opcode[6],
 235                    Opcode[7],
 236                    Opcode[8],
 237                    Opcode[9]);
 238
 239     Fast486DumpState(&EmulatorContext);
 240
 241     /* Stop the VDM */
 242     EmulatorTerminate();
 243     return;
 244 }
 245
 246 VOID EmulatorTerminate(VOID)
 247 {
 248     /* Stop the VDM */
 249     CpuUnsimulate(); // Halt the CPU
 250     VdmRunning = FALSE;
 251 }
 252
 253 VOID EmulatorInterruptSignal(VOID)
 254 {
 255     /* Call the Fast486 API */
 256     Fast486InterruptSignal(&EmulatorContext);
 257 }
 258
 259 VOID EmulatorSetA20(BOOLEAN Enabled)
 260 {
 261     A20Line = Enabled;
 262 }
 263
 264 static VOID WINAPI EmulatorDebugBreakBop(LPWORD Stack)
 265 {
 266     DPRINT1("NTVDM: BOP_DEBUGGER\n");
 267     DebugBreak();
 268 }
 269
 270 static BYTE WINAPI Port61hRead(USHORT Port)
 271 {
 272     return Port61hState;
 273 }
 274
 275 static VOID WINAPI Port61hWrite(USHORT Port, BYTE Data)
 276 {
 277     // BOOLEAN SpeakerStateChange = FALSE;
 278     BYTE OldPort61hState = Port61hState;
 279
 280     /* Only the four lowest bytes can be written */
 281     Port61hState = (Port61hState & 0xF0) | (Data & 0x0F);
 282
 283     if ((OldPort61hState ^ Port61hState) & 0x01)
 284     {
 285         DPRINT("PIT 2 Gate %s\n", Port61hState & 0x01 ? "on" : "off");
 286         PitSetGate(2, !!(Port61hState & 0x01));
 287         // SpeakerStateChange = TRUE;
 288     }
 289
 290     if ((OldPort61hState ^ Port61hState) & 0x02)
 291     {
 292         /* There were some change for the speaker... */
 293         DPRINT("Speaker %s\n", Port61hState & 0x02 ? "on" : "off");
 294         // SpeakerStateChange = TRUE;
 295     }
 296     // if (SpeakerStateChange) SpeakerChange(Port61hState);
 297     SpeakerChange(Port61hState);
 298 }
 299
 300 static VOID WINAPI PitChan0Out(LPVOID Param, BOOLEAN State)
 301 {
 302     if (State)
 303     {
 304         DPRINT("PicInterruptRequest\n");
 305         PicInterruptRequest(0); // Raise IRQ 0
 306     }
 307     // else < Lower IRQ 0 >
 308 }
 309
 310 static VOID WINAPI PitChan1Out(LPVOID Param, BOOLEAN State)
 311 {
 312 #if 0
 313     if (State)
 314     {
 315         /* Set bit 4 of Port 61h */
 316         Port61hState |= 1 << 4;
 317     }
 318     else
 319     {
 320         /* Clear bit 4 of Port 61h */
 321         Port61hState &= ~(1 << 4);
 322     }
 323 #else
 324     Port61hState = (Port61hState & 0xEF) | (State << 4);
 325 #endif
 326 }
 327
 328 static VOID WINAPI PitChan2Out(LPVOID Param, BOOLEAN State)
 329 {
 330     BYTE OldPort61hState = Port61hState;
 331
 332 #if 0
 333     if (State)
 334     {
 335         /* Set bit 5 of Port 61h */
 336         Port61hState |= 1 << 5;
 337     }
 338     else
 339     {
 340         /* Clear bit 5 of Port 61h */
 341         Port61hState &= ~(1 << 5);
 342     }
 343 #else
 344     Port61hState = (Port61hState & 0xDF) | (State << 5);
 345 #endif
 346
 347     if ((OldPort61hState ^ Port61hState) & 0x20)
 348     {
 349         DPRINT("PitChan2Out -- Port61hState changed\n");
 350         SpeakerChange(Port61hState);
 351     }
 352 }
 353
 354
 355 static DWORD
 356 WINAPI
 357 PumpConsoleInput(LPVOID Parameter)
 358 {
 359     HANDLE ConsoleInput = (HANDLE)Parameter;
 360     INPUT_RECORD InputRecord;
 361     DWORD Count;
 362
 363     while (VdmRunning)
 364     {
 365         /* Make sure the task event is signaled */
 366         WaitForSingleObject(VdmTaskEvent, INFINITE);
 367
 368         /* Wait for an input record */
 369         if (!ReadConsoleInput(ConsoleInput, &InputRecord, 1, &Count))
 370         {
 371             DWORD LastError = GetLastError();
 372             DPRINT1("Error reading console input (0x%p, %lu) - Error %lu\n", ConsoleInput, Count, LastError);
 373             return LastError;
 374         }
 375
 376         ASSERT(Count != 0);
 377
 378         /* Check the event type */
 379         switch (InputRecord.EventType)
 380         {
 381             /*
 382              * Hardware events
 383              */
 384             case KEY_EVENT:
 385                 KeyboardEventHandler(&InputRecord.Event.KeyEvent);
 386                 break;
 387
 388             case MOUSE_EVENT:
 389                 MouseEventHandler(&InputRecord.Event.MouseEvent);
 390                 break;
 391
 392             case WINDOW_BUFFER_SIZE_EVENT:
 393                 ScreenEventHandler(&InputRecord.Event.WindowBufferSizeEvent);
 394                 break;
 395
 396             /*
 397              * Interface events
 398              */
 399             case MENU_EVENT:
 400                 MenuEventHandler(&InputRecord.Event.MenuEvent);
 401                 break;
 402
 403             case FOCUS_EVENT:
 404                 FocusEventHandler(&InputRecord.Event.FocusEvent);
 405                 break;
 406
 407             default:
 408                 break;
 409         }
 410     }
 411
 412     return 0;
 413 }
 414
 415 static VOID EnableExtraHardware(HANDLE ConsoleInput)
 416 {
 417     DWORD ConInMode;
 418
 419     if (GetConsoleMode(ConsoleInput, &ConInMode))
 420     {
 421 #if 0
 422         // GetNumberOfConsoleMouseButtons();
 423         // GetSystemMetrics(SM_CMOUSEBUTTONS);
 424         // GetSystemMetrics(SM_MOUSEPRESENT);
 425         if (MousePresent)
 426         {
 427 #endif
 428             /* Support mouse input events if there is a mouse on the system */
 429             ConInMode |= ENABLE_MOUSE_INPUT;
 430 #if 0
 431         }
 432         else
 433         {
 434             /* Do not support mouse input events if there is no mouse on the system */
 435             ConInMode &= ~ENABLE_MOUSE_INPUT;
 436         }
 437 #endif
 438
 439         SetConsoleMode(ConsoleInput, ConInMode);
 440     }
 441 }
 442
 443 /* PUBLIC FUNCTIONS ***********************************************************/
 444
 445 static VOID
 446 DumpMemoryRaw(HANDLE hFile)
 447 {
 448     PVOID  Buffer;
 449     SIZE_T Size;
 450
 451     /* Dump the VM memory */
 452     SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
 453     Buffer = REAL_TO_PHYS(NULL);
 454     Size   = MAX_ADDRESS - (ULONG_PTR)(NULL);
 455     WriteFile(hFile, Buffer, Size, &Size, NULL);
 456 }
 457
 458 static VOID
 459 DumpMemoryTxt(HANDLE hFile)
 460 {
 461 #define LINE_SIZE   75 + 2
 462     ULONG  i;
 463     PBYTE  Ptr1, Ptr2;
 464     CHAR   LineBuffer[LINE_SIZE];
 465     PCHAR  Line;
 466     SIZE_T LineSize;
 467
 468     /* Dump the VM memory */
 469     SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
 470     Ptr1 = Ptr2 = REAL_TO_PHYS(NULL);
 471     while (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr1) > 0)
 472     {
 473         Ptr1 = Ptr2;
 474         Line = LineBuffer;
 475
 476         /* Print the address */
 477         Line += snprintf(Line, LINE_SIZE + LineBuffer - Line, "%08x ", PHYS_TO_REAL(Ptr1));
 478
 479         /* Print up to 16 bytes... */
 480
 481         /* ... in hexadecimal form first... */
 482         i = 0;
 483         while (i++ <= 0x0F && (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr1) > 0))
 484         {
 485             Line += snprintf(Line, LINE_SIZE + LineBuffer - Line, " %02x", *Ptr1);
 486             ++Ptr1;
 487         }
 488
 489         /* ... align with spaces if needed... */
 490         RtlFillMemory(Line, 0x0F + 4 - i, ' ');
 491         Line += 0x0F + 4 - i;
 492
 493         /* ... then in character form. */
 494         i = 0;
 495         while (i++ <= 0x0F && (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr2) > 0))
 496         {
 497             *Line++ = ((*Ptr2 >= 0x20 && *Ptr2 <= 0x7E) || (*Ptr2 >= 0x80 && *Ptr2 < 0xFF) ? *Ptr2 : '.');
 498             ++Ptr2;
 499         }
 500
 501         /* Newline */
 502         *Line++ = '\r';
 503         *Line++ = '\n';
 504
 505         /* Finally write the line to the file */
 506         LineSize = Line - LineBuffer;
 507         WriteFile(hFile, LineBuffer, LineSize, &LineSize, NULL);
 508     }
 509 }
 510
 511 VOID DumpMemory(BOOLEAN TextFormat)
 512 {
 513     static ULONG DumpNumber = 0;
 514
 515     HANDLE hFile;
 516     WCHAR  FileName[MAX_PATH];
 517
 518     /* Build a suitable file name */
 519     _snwprintf(FileName, MAX_PATH,
 520                L"memdump%lu.%s",
 521                DumpNumber,
 522                TextFormat ? L"txt" : L"dat");
 523     ++DumpNumber;
 524
 525     DPRINT1("Creating memory dump file '%S'...\n", FileName);
 526
 527     /* Always create the dump file */
 528     hFile = CreateFileW(FileName,
 529                         GENERIC_WRITE,
 530                         0,
 531                         NULL,
 532                         CREATE_ALWAYS,
 533                         FILE_ATTRIBUTE_NORMAL,
 534                         NULL);
 535
 536     if (hFile == INVALID_HANDLE_VALUE)
 537     {
 538         DPRINT1("Error when creating '%S' for memory dumping, GetLastError() = %u\n",
 539                 FileName, GetLastError());
 540         return;
 541     }
 542
 543     /* Dump the VM memory in the chosen format */
 544     if (TextFormat)
 545         DumpMemoryTxt(hFile);
 546     else
 547         DumpMemoryRaw(hFile);
 548
 549     /* Close the file */
 550     CloseHandle(hFile);
 551
 552     DPRINT1("Memory dump done\n");
 553 }
 554
 555 BOOLEAN EmulatorInitialize(HANDLE ConsoleInput, HANDLE ConsoleOutput)
 556 {
 557     /* Allocate memory for the 16-bit address space */
 558     BaseAddress = HeapAlloc(GetProcessHeap(), /*HEAP_ZERO_MEMORY*/ 0, MAX_ADDRESS);
 559     if (BaseAddress == NULL)
 560     {
 561         wprintf(L"FATAL: Failed to allocate VDM memory.\n");
 562         return FALSE;
 563     }
 564     /*
 565      * For diagnostics purposes, we fill the memory with INT 0x03 codes
 566      * so that if a program wants to execute random code in memory, we can
 567      * retrieve the exact CS:IP where the problem happens.
 568      */
 569     RtlFillMemory(BaseAddress, MAX_ADDRESS, 0xCC);
 570
 571     /* Initialize I/O ports */
 572     /* Initialize RAM */
 573
 574     /* Initialize the CPU */
 575
 576     /* Initialize the internal clock */
 577     if (!ClockInitialize())
 578     {
 579         wprintf(L"FATAL: Failed to initialize the clock\n");
 580         return FALSE;
 581     }
 582
 583     /* Initialize the CPU */
 584     CpuInitialize();
 585     // Fast486Initialize(&EmulatorContext,
 586                       // EmulatorReadMemory,
 587                       // EmulatorWriteMemory,
 588                       // EmulatorReadIo,
 589                       // EmulatorWriteIo,
 590                       // NULL,
 591                       // EmulatorBiosOperation,
 592                       // EmulatorIntAcknowledge,
 593                       // NULL /* TODO: Use a TLB */);
 594
 595     /* Initialize DMA */
 596
 597     /* Initialize the PIC, the PIT, the CMOS and the PC Speaker */
 598     PicInitialize();
 599     PitInitialize();
 600     CmosInitialize();
 601     SpeakerInitialize();
 602
 603     /* Set output functions */
 604     PitSetOutFunction(0, NULL, PitChan0Out);
 605     PitSetOutFunction(1, NULL, PitChan1Out);
 606     PitSetOutFunction(2, NULL, PitChan2Out);
 607
 608     /* Register the I/O Ports */
 609     RegisterIoPort(CONTROL_SYSTEM_PORT61H, Port61hRead, Port61hWrite);
 610
 611     /* Set the console input mode */
 612     // FIXME: Activate ENABLE_WINDOW_INPUT when we will want to perform actions
 613     // upon console window events (screen buffer resize, ...).
 614     SetConsoleMode(ConsoleInput, ENABLE_PROCESSED_INPUT /* | ENABLE_WINDOW_INPUT */);
 615     // SetConsoleMode(ConsoleOutput, ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
 616
 617     /**/EnableExtraHardware(ConsoleInput);/**/
 618
 619     /* Initialize the PS/2 port */
 620     PS2Initialize();
 621
 622     /* Initialize the keyboard and mouse and connect them to their PS/2 ports */
 623     KeyboardInit(0);
 624     MouseInit(1);
 625
 626     /**************** ATTACH INPUT WITH CONSOLE *****************/
 627     /* Start the input thread */
 628     InputThread = CreateThread(NULL, 0, &PumpConsoleInput, ConsoleInput, 0, NULL);
 629     if (InputThread == NULL)
 630     {
 631         DisplayMessage(L"Failed to create the console input thread.");
 632         return FALSE;
 633     }
 634     /************************************************************/
 635
 636     /* Initialize the VGA */
 637     if (!VgaInitialize(ConsoleOutput))
 638     {
 639         DisplayMessage(L"Failed to initialize VGA support.");
 640         return FALSE;
 641     }
 642
 643     /* Initialize the software callback system and register the emulator BOPs */
 644     InitializeInt32();
 645     RegisterBop(BOP_DEBUGGER  , EmulatorDebugBreakBop);
 646     // RegisterBop(BOP_UNSIMULATE, CpuUnsimulateBop);
 647
 648     /* Initialize VDD support */
 649     VDDSupInitialize();
 650
 651     return TRUE;
 652 }
 653
 654 VOID EmulatorCleanup(VOID)
 655 {
 656     VgaCleanup();
 657
 658     /* Close the input thread handle */
 659     if (InputThread != NULL) CloseHandle(InputThread);
 660     InputThread = NULL;
 661
 662     PS2Cleanup();
 663
 664     SpeakerCleanup();
 665     CmosCleanup();
 666     // PitCleanup();
 667     // PicCleanup();
 668
 669     CpuCleanup();
 670
 671     /* Free the memory allocated for the 16-bit address space */
 672     if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
 673 }
 674
 675
 676
 677 VOID
 678 WINAPI
 679 VDDSimulate16(VOID)
 680 {
 681     CpuSimulate();
 682 }
 683
 684 VOID
 685 WINAPI
 686 VDDTerminateVDM(VOID)
 687 {
 688     /* Stop the VDM */
 689     EmulatorTerminate();
 690 }
 691
 692 PBYTE
 693 WINAPI
 694 Sim32pGetVDMPointer(IN ULONG   Address,
 695                     IN BOOLEAN ProtectedMode)
 696 {
 697     // FIXME
 698     UNREFERENCED_PARAMETER(ProtectedMode);
 699
 700     /*
 701      * HIWORD(Address) == Segment  (if ProtectedMode == FALSE)
 702      *                 or Selector (if ProtectedMode == TRUE )
 703      * LOWORD(Address) == Offset
 704      */
 705     return (PBYTE)FAR_POINTER(Address);
 706 }
 707
 708 PBYTE
 709 WINAPI
 710 MGetVdmPointer(IN ULONG   Address,
 711                IN ULONG   Size,
 712                IN BOOLEAN ProtectedMode)
 713 {
 714     UNREFERENCED_PARAMETER(Size);
 715     return Sim32pGetVDMPointer(Address, ProtectedMode);
 716 }
 717
 718 PVOID
 719 WINAPI
 720 VdmMapFlat(IN USHORT   Segment,
 721            IN ULONG    Offset,
 722            IN VDM_MODE Mode)
 723 {
 724     // FIXME
 725     UNREFERENCED_PARAMETER(Mode);
 726
 727     return SEG_OFF_TO_PTR(Segment, Offset);
 728 }
 729
 730 BOOL
 731 WINAPI
 732 VdmFlushCache(IN USHORT   Segment,
 733               IN ULONG    Offset,
 734               IN ULONG    Size,
 735               IN VDM_MODE Mode)
 736 {
 737     // FIXME
 738     UNIMPLEMENTED;
 739     return TRUE;
 740 }
 741
 742 BOOL
 743 WINAPI
 744 VdmUnmapFlat(IN USHORT   Segment,
 745              IN ULONG    Offset,
 746              IN PVOID    Buffer,
 747              IN VDM_MODE Mode)
 748 {
 749     // FIXME
 750     UNIMPLEMENTED;
 751     return TRUE;
 752 }
 753
 754 /* EOF */