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880d3c125f
Set VdmRunning to TRUE in EmulatorSimulate. svn path=/branches/ntvdm/; revision=63109
518 lines
13 KiB
C
518 lines
13 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: emulator.c
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* PURPOSE: Minimal x86 machine emulator for the VDM
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*/
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/* INCLUDES *******************************************************************/
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#define NDEBUG
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#include "emulator.h"
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#include "callback.h"
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#include "clock.h"
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#include "bios/rom.h"
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#include "hardware/cmos.h"
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#include "hardware/pic.h"
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#include "hardware/ps2.h"
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#include "hardware/speaker.h"
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#include "hardware/timer.h"
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#include "hardware/vga.h"
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#include "bop.h"
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#include "vddsup.h"
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#include "io.h"
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#include <isvbop.h>
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/* PRIVATE VARIABLES **********************************************************/
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FAST486_STATE EmulatorContext;
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BOOLEAN CpuSimulate = FALSE;
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/* No more than 'MaxCpuCallLevel' recursive CPU calls are allowed */
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const static INT MaxCpuCallLevel = 32;
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static INT CpuCallLevel = 0;
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LPVOID BaseAddress = NULL;
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BOOLEAN VdmRunning = TRUE;
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static BOOLEAN A20Line = FALSE;
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static BYTE Port61hState = 0x00;
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static HANDLE InputThread = NULL;
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LPCWSTR ExceptionName[] =
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{
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L"Division By Zero",
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L"Debug",
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L"Unexpected Error",
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L"Breakpoint",
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L"Integer Overflow",
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L"Bound Range Exceeded",
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L"Invalid Opcode",
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L"FPU Not Available"
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};
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/* BOP Identifiers */
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#define BOP_DEBUGGER 0x56 // Break into the debugger from a 16-bit app
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/* PRIVATE FUNCTIONS **********************************************************/
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VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
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{
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UNREFERENCED_PARAMETER(State);
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// BIG HACK!!!! To make BIOS images working correctly,
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// until Aleksander rewrites memory management!!
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if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
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/* If the A20 line is disabled, mask bit 20 */
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if (!A20Line) Address &= ~(1 << 20);
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/* Make sure the requested address is valid */
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if ((Address + Size) >= MAX_ADDRESS) return;
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/*
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* Check if we are going to read the VGA memory and
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* copy it into the virtual address space if needed.
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*/
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if (((Address + Size) >= VgaGetVideoBaseAddress())
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&& (Address < VgaGetVideoLimitAddress()))
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{
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DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
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DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
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- VgaAddress + 1;
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LPBYTE DestBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);
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/* Read from the VGA memory */
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VgaReadMemory(VgaAddress, DestBuffer, ActualSize);
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}
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/* Read the data from the virtual address space and store it in the buffer */
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RtlCopyMemory(Buffer, REAL_TO_PHYS(Address), Size);
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}
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VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
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{
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UNREFERENCED_PARAMETER(State);
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// BIG HACK!!!! To make BIOS images working correctly,
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// until Aleksander rewrites memory management!!
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if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
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/* If the A20 line is disabled, mask bit 20 */
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if (!A20Line) Address &= ~(1 << 20);
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/* Make sure the requested address is valid */
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if ((Address + Size) >= MAX_ADDRESS) return;
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/* Make sure we don't write to the ROM area */
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if ((Address + Size) >= ROM_AREA_START && (Address < ROM_AREA_END)) return;
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/* Read the data from the buffer and store it in the virtual address space */
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RtlCopyMemory(REAL_TO_PHYS(Address), Buffer, Size);
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/*
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* Check if we modified the VGA memory.
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*/
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if (((Address + Size) >= VgaGetVideoBaseAddress())
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&& (Address < VgaGetVideoLimitAddress()))
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{
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DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
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DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
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- VgaAddress + 1;
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LPBYTE SrcBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);
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/* Write to the VGA memory */
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VgaWriteMemory(VgaAddress, SrcBuffer, ActualSize);
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}
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}
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UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
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{
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UNREFERENCED_PARAMETER(State);
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/* Get the interrupt number from the PIC */
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return PicGetInterrupt();
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}
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VOID EmulatorException(BYTE ExceptionNumber, LPWORD Stack)
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{
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WORD CodeSegment, InstructionPointer;
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PBYTE Opcode;
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ASSERT(ExceptionNumber < 8);
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/* Get the CS:IP */
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InstructionPointer = Stack[STACK_IP];
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CodeSegment = Stack[STACK_CS];
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Opcode = (PBYTE)SEG_OFF_TO_PTR(CodeSegment, InstructionPointer);
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/* Display a message to the user */
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DisplayMessage(L"Exception: %s occured at %04X:%04X\n"
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L"Opcode: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X",
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ExceptionName[ExceptionNumber],
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CodeSegment,
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InstructionPointer,
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Opcode[0],
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Opcode[1],
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Opcode[2],
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Opcode[3],
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Opcode[4],
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Opcode[5],
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Opcode[6],
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Opcode[7],
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Opcode[8],
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Opcode[9]);
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/* Stop the VDM */
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EmulatorTerminate();
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return;
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}
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// FIXME: This function assumes 16-bit mode!!!
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VOID EmulatorExecute(WORD Segment, WORD Offset)
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{
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/* Tell Fast486 to move the instruction pointer */
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Fast486ExecuteAt(&EmulatorContext, Segment, Offset);
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}
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VOID EmulatorStep(VOID)
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{
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/* Dump the state for debugging purposes */
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// Fast486DumpState(&EmulatorContext);
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/* Execute the next instruction */
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Fast486StepInto(&EmulatorContext);
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}
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VOID EmulatorSimulate(VOID)
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{
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if (CpuCallLevel > MaxCpuCallLevel)
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{
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DisplayMessage(L"Too many CPU levels of recursion (%d, expected maximum %d)",
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CpuCallLevel, MaxCpuCallLevel);
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/* Stop the VDM */
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EmulatorTerminate();
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return;
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}
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CpuCallLevel++;
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VdmRunning = CpuSimulate = TRUE;
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while (VdmRunning && CpuSimulate) ClockUpdate();
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CpuCallLevel--;
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if (CpuCallLevel < 0) CpuCallLevel = 0;
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/* This takes into account for reentrance */
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CpuSimulate = TRUE;
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}
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VOID EmulatorUnsimulate(VOID)
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{
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/* Stop simulation */
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CpuSimulate = FALSE;
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}
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VOID EmulatorTerminate(VOID)
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{
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/* Stop the VDM */
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VdmRunning = FALSE;
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}
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VOID EmulatorInterrupt(BYTE Number)
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{
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/* Call the Fast486 API */
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Fast486Interrupt(&EmulatorContext, Number);
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}
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VOID EmulatorInterruptSignal(VOID)
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{
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/* Call the Fast486 API */
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Fast486InterruptSignal(&EmulatorContext);
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}
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VOID EmulatorSetA20(BOOLEAN Enabled)
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{
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A20Line = Enabled;
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}
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static VOID WINAPI EmulatorDebugBreakBop(LPWORD Stack)
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{
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DPRINT1("NTVDM: BOP_DEBUGGER\n");
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DebugBreak();
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}
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static VOID WINAPI EmulatorUnsimulateBop(LPWORD Stack)
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{
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EmulatorUnsimulate();
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}
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static BYTE WINAPI Port61hRead(ULONG Port)
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{
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return Port61hState;
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}
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static VOID WINAPI Port61hWrite(ULONG Port, BYTE Data)
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{
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// BOOLEAN SpeakerChange = FALSE;
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BYTE OldPort61hState = Port61hState;
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/* Only the four lowest bytes can be written */
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Port61hState = (Port61hState & 0xF0) | (Data & 0x0F);
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if ((OldPort61hState ^ Port61hState) & 0x01)
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{
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DPRINT("PIT 2 Gate %s\n", Port61hState & 0x01 ? "on" : "off");
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// SpeakerChange = TRUE;
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}
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PitSetGate(2, !!(Port61hState & 0x01));
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if ((OldPort61hState ^ Port61hState) & 0x02)
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{
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/* There were some change for the speaker... */
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DPRINT("Speaker %s\n", Port61hState & 0x02 ? "on" : "off");
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// SpeakerChange = TRUE;
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}
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// if (SpeakerChange) SpeakerChange();
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SpeakerChange();
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}
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static VOID WINAPI PitChan0Out(LPVOID Param, BOOLEAN State)
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{
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if (State)
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{
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DPRINT("PicInterruptRequest\n");
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PicInterruptRequest(0); // Raise IRQ 0
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}
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// else < Lower IRQ 0 >
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}
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static VOID WINAPI PitChan1Out(LPVOID Param, BOOLEAN State)
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{
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#if 0
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if (State)
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{
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/* Set bit 4 of Port 61h */
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Port61hState |= 1 << 4;
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}
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else
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{
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/* Clear bit 4 of Port 61h */
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Port61hState &= ~(1 << 4);
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}
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#else
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Port61hState = (Port61hState & 0xEF) | (State << 4);
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#endif
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}
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static VOID WINAPI PitChan2Out(LPVOID Param, BOOLEAN State)
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{
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// BYTE OldPort61hState = Port61hState;
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#if 0
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if (State)
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{
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/* Set bit 5 of Port 61h */
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Port61hState |= 1 << 5;
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}
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else
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{
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/* Clear bit 5 of Port 61h */
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Port61hState &= ~(1 << 5);
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}
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#else
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Port61hState = (Port61hState & 0xDF) | (State << 5);
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#endif
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DPRINT("Speaker PIT out\n");
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// if ((OldPort61hState ^ Port61hState) & 0x20)
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// SpeakerChange();
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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DWORD WINAPI PumpConsoleInput(LPVOID Parameter);
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BOOLEAN EmulatorInitialize(HANDLE ConsoleInput, HANDLE ConsoleOutput)
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{
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/* Allocate memory for the 16-bit address space */
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BaseAddress = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, MAX_ADDRESS);
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if (BaseAddress == NULL)
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{
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wprintf(L"FATAL: Failed to allocate VDM memory.\n");
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return FALSE;
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}
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/* Initialize I/O ports */
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/* Initialize RAM */
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/* Initialize the internal clock */
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if (!ClockInitialize())
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{
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wprintf(L"FATAL: Failed to initialize the clock\n");
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return FALSE;
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}
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/* Initialize the CPU */
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Fast486Initialize(&EmulatorContext,
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EmulatorReadMemory,
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EmulatorWriteMemory,
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EmulatorReadIo,
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EmulatorWriteIo,
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NULL,
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EmulatorBiosOperation,
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EmulatorIntAcknowledge,
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NULL /* TODO: Use a TLB */);
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/* Initialize DMA */
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/* Initialize the PIC, the PIT, the CMOS and the PC Speaker */
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PicInitialize();
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PitInitialize();
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CmosInitialize();
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SpeakerInitialize();
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/* Set output functions */
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PitSetOutFunction(0, NULL, PitChan0Out);
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PitSetOutFunction(1, NULL, PitChan1Out);
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PitSetOutFunction(2, NULL, PitChan2Out);
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/* Register the I/O Ports */
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RegisterIoPort(CONTROL_SYSTEM_PORT61H, Port61hRead, Port61hWrite);
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/* Set the console input mode */
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// FIXME: Activate ENABLE_WINDOW_INPUT when we will want to perform actions
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// upon console window events (screen buffer resize, ...).
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SetConsoleMode(ConsoleInput, ENABLE_PROCESSED_INPUT /* | ENABLE_WINDOW_INPUT */);
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// SetConsoleMode(ConsoleOutput, ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
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/* Initialize the PS2 port */
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PS2Initialize(ConsoleInput);
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/* Start the input thread */
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InputThread = CreateThread(NULL, 0, &PumpConsoleInput, ConsoleInput, 0, NULL);
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// if (InputThread == NULL) return FALSE;
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/* Initialize the VGA */
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// if (!VgaInitialize(ConsoleOutput)) return FALSE;
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VgaInitialize(ConsoleOutput);
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/* Initialize the software callback system and register the emulator BOPs */
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InitializeCallbacks();
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RegisterBop(BOP_DEBUGGER , EmulatorDebugBreakBop);
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RegisterBop(BOP_UNSIMULATE, EmulatorUnsimulateBop);
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/* Initialize VDD support */
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VDDSupInitialize();
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return TRUE;
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}
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VOID EmulatorCleanup(VOID)
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{
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VgaCleanup();
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/* Close the input thread handle */
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if (InputThread != NULL) CloseHandle(InputThread);
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InputThread = NULL;
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PS2Cleanup();
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SpeakerCleanup();
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CmosCleanup();
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// PitCleanup();
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// PicCleanup();
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// Fast486Cleanup();
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/* Free the memory allocated for the 16-bit address space */
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if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
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}
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VOID
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WINAPI
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VDDSimulate16(VOID)
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{
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EmulatorSimulate();
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}
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VOID
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WINAPI
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VDDTerminateVDM(VOID)
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{
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/* Stop the VDM */
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EmulatorTerminate();
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}
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PBYTE
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WINAPI
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Sim32pGetVDMPointer(IN ULONG Address,
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IN BOOLEAN ProtectedMode)
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{
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// FIXME
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UNREFERENCED_PARAMETER(ProtectedMode);
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/*
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* HIWORD(Address) == Segment (if ProtectedMode == FALSE)
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* or Selector (if ProtectedMode == TRUE )
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* LOWORD(Address) == Offset
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*/
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return (PBYTE)FAR_POINTER(Address);
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}
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PBYTE
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WINAPI
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MGetVdmPointer(IN ULONG Address,
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IN ULONG Size,
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IN BOOLEAN ProtectedMode)
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{
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UNREFERENCED_PARAMETER(Size);
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return Sim32pGetVDMPointer(Address, ProtectedMode);
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}
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PVOID
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WINAPI
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VdmMapFlat(IN USHORT Segment,
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IN ULONG Offset,
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IN VDM_MODE Mode)
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{
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// FIXME
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UNREFERENCED_PARAMETER(Mode);
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return SEG_OFF_TO_PTR(Segment, Offset);
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}
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BOOL
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WINAPI
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VdmFlushCache(IN USHORT Segment,
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IN ULONG Offset,
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IN ULONG Size,
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IN VDM_MODE Mode)
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{
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// FIXME
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UNIMPLEMENTED;
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return TRUE;
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}
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BOOL
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WINAPI
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VdmUnmapFlat(IN USHORT Segment,
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IN ULONG Offset,
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IN PVOID Buffer,
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IN VDM_MODE Mode)
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{
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// FIXME
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UNIMPLEMENTED;
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return TRUE;
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}
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/* EOF */
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