mirror of
https://github.com/reactos/reactos.git
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609ba8d717
svn path=/branches/shell-experiments/; revision=64830
761 lines
19 KiB
C
761 lines
19 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 "cpu/callback.h"
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#include "cpu/cpu.h"
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#include "cpu/bop.h"
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#include <isvbop.h>
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#include "int32.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/keyboard.h"
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#include "hardware/mouse.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 "vddsup.h"
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#include "io.h"
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/* PRIVATE VARIABLES **********************************************************/
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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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static inline VOID
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EmulatorMoveMemory(OUT VOID UNALIGNED *Destination,
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IN const VOID UNALIGNED *Source,
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IN SIZE_T Length)
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{
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#if 1
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/*
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* We use a switch here to detect small moves of memory, as these
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* constitute the bulk of our moves.
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* Using RtlMoveMemory for all these small moves would be slow otherwise.
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*/
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switch (Length)
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{
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case 0:
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return;
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case sizeof(UCHAR):
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*(PUCHAR)Destination = *(PUCHAR)Source;
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return;
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case sizeof(USHORT):
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*(PUSHORT)Destination = *(PUSHORT)Source;
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return;
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case sizeof(ULONG):
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*(PULONG)Destination = *(PULONG)Source;
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return;
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case sizeof(ULONGLONG):
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*(PULONGLONG)Destination = *(PULONGLONG)Source;
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return;
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default:
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#if defined(__GNUC__)
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__builtin_memmove(Destination, Source, Length);
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#else
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RtlMoveMemory(Destination, Source, Length);
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#endif
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}
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#else // defined(_MSC_VER)
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PUCHAR Dest = (PUCHAR)Destination;
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PUCHAR Src = (PUCHAR)Source;
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SIZE_T Count, NewSize = Length;
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/* Move dword */
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Count = NewSize >> 2; // NewSize / sizeof(ULONG);
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NewSize = NewSize & 3; // NewSize % sizeof(ULONG);
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__movsd(Dest, Src, Count);
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Dest += Count << 2; // Count * sizeof(ULONG);
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Src += Count << 2;
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/* Move word */
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Count = NewSize >> 1; // NewSize / sizeof(USHORT);
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NewSize = NewSize & 1; // NewSize % sizeof(USHORT);
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__movsw(Dest, Src, Count);
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Dest += Count << 1; // Count * sizeof(USHORT);
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Src += Count << 1;
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/* Move byte */
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Count = NewSize; // NewSize / sizeof(UCHAR);
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// NewSize = NewSize; // NewSize % sizeof(UCHAR);
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__movsb(Dest, Src, Count);
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#endif
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}
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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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EmulatorMoveMemory(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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EmulatorMoveMemory(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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Fast486DumpState(&EmulatorContext);
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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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VOID EmulatorTerminate(VOID)
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{
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/* Stop the VDM */
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CpuUnsimulate(); // Halt the CPU
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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 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 SpeakerStateChange = 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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PitSetGate(2, !!(Port61hState & 0x01));
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// SpeakerStateChange = TRUE;
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}
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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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// SpeakerStateChange = TRUE;
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}
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// if (SpeakerStateChange) 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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if ((OldPort61hState ^ Port61hState) & 0x20)
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{
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DPRINT("PitChan2Out -- Port61hState changed\n");
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SpeakerChange();
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}
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}
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static DWORD
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WINAPI
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PumpConsoleInput(LPVOID Parameter)
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{
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HANDLE ConsoleInput = (HANDLE)Parameter;
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INPUT_RECORD InputRecord;
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DWORD Count;
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while (VdmRunning)
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{
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/* Make sure the task event is signaled */
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WaitForSingleObject(VdmTaskEvent, INFINITE);
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/* Wait for an input record */
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if (!ReadConsoleInput(ConsoleInput, &InputRecord, 1, &Count))
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{
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DWORD LastError = GetLastError();
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DPRINT1("Error reading console input (0x%p, %lu) - Error %lu\n", ConsoleInput, Count, LastError);
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return LastError;
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}
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ASSERT(Count != 0);
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/* Check the event type */
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switch (InputRecord.EventType)
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{
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/*
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* Hardware events
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*/
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case KEY_EVENT:
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KeyboardEventHandler(&InputRecord.Event.KeyEvent);
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break;
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case MOUSE_EVENT:
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MouseEventHandler(&InputRecord.Event.MouseEvent);
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break;
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case WINDOW_BUFFER_SIZE_EVENT:
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ScreenEventHandler(&InputRecord.Event.WindowBufferSizeEvent);
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break;
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/*
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* Interface events
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*/
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case MENU_EVENT:
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MenuEventHandler(&InputRecord.Event.MenuEvent);
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break;
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case FOCUS_EVENT:
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FocusEventHandler(&InputRecord.Event.FocusEvent);
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break;
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default:
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break;
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}
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}
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return 0;
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}
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static VOID EnableExtraHardware(HANDLE ConsoleInput)
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{
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DWORD ConInMode;
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if (GetConsoleMode(ConsoleInput, &ConInMode))
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{
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#if 0
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// GetNumberOfConsoleMouseButtons();
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// GetSystemMetrics(SM_CMOUSEBUTTONS);
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// GetSystemMetrics(SM_MOUSEPRESENT);
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if (MousePresent)
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{
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#endif
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/* Support mouse input events if there is a mouse on the system */
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ConInMode |= ENABLE_MOUSE_INPUT;
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#if 0
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}
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else
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{
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/* Do not support mouse input events if there is no mouse on the system */
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ConInMode &= ~ENABLE_MOUSE_INPUT;
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}
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#endif
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SetConsoleMode(ConsoleInput, ConInMode);
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}
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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static VOID
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DumpMemoryRaw(HANDLE hFile)
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{
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PVOID Buffer;
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SIZE_T Size;
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/* Dump the VM memory */
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SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
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Buffer = REAL_TO_PHYS(NULL);
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Size = MAX_ADDRESS - (ULONG_PTR)(NULL);
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WriteFile(hFile, Buffer, Size, &Size, NULL);
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}
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static VOID
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DumpMemoryTxt(HANDLE hFile)
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{
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#define LINE_SIZE 75 + 2
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ULONG i;
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PBYTE Ptr1, Ptr2;
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CHAR LineBuffer[LINE_SIZE];
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PCHAR Line;
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SIZE_T LineSize;
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/* Dump the VM memory */
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SetFilePointer(hFile, 0, NULL, FILE_BEGIN);
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Ptr1 = Ptr2 = REAL_TO_PHYS(NULL);
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while (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr1) > 0)
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{
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Ptr1 = Ptr2;
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Line = LineBuffer;
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/* Print the address */
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Line += snprintf(Line, LINE_SIZE + LineBuffer - Line, "%08x ", PHYS_TO_REAL(Ptr1));
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/* Print up to 16 bytes... */
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/* ... in hexadecimal form first... */
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i = 0;
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while (i++ <= 0x0F && (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr1) > 0))
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{
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Line += snprintf(Line, LINE_SIZE + LineBuffer - Line, " %02x", *Ptr1);
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++Ptr1;
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}
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/* ... align with spaces if needed... */
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RtlFillMemory(Line, 0x0F + 4 - i, ' ');
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Line += 0x0F + 4 - i;
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/* ... then in character form. */
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i = 0;
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while (i++ <= 0x0F && (MAX_ADDRESS - (ULONG_PTR)PHYS_TO_REAL(Ptr2) > 0))
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{
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*Line++ = ((*Ptr2 >= 0x20 && *Ptr2 <= 0x7E) || (*Ptr2 >= 0x80 && *Ptr2 < 0xFF) ? *Ptr2 : '.');
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++Ptr2;
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}
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/* Newline */
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*Line++ = '\r';
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*Line++ = '\n';
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/* Finally write the line to the file */
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LineSize = Line - LineBuffer;
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WriteFile(hFile, LineBuffer, LineSize, &LineSize, NULL);
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}
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}
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VOID DumpMemory(BOOLEAN TextFormat)
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{
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static ULONG DumpNumber = 0;
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HANDLE hFile;
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WCHAR FileName[MAX_PATH];
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/* Build a suitable file name */
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_snwprintf(FileName, MAX_PATH,
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L"memdump%lu.%s",
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DumpNumber,
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TextFormat ? L"txt" : L"dat");
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++DumpNumber;
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DPRINT1("Creating memory dump file '%S'...\n", FileName);
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/* Always create the dump file */
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hFile = CreateFileW(FileName,
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GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL);
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if (hFile == INVALID_HANDLE_VALUE)
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{
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DPRINT1("Error when creating '%S' for memory dumping, GetLastError() = %u\n",
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FileName, GetLastError());
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return;
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}
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/* Dump the VM memory in the chosen format */
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if (TextFormat)
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DumpMemoryTxt(hFile);
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else
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DumpMemoryRaw(hFile);
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/* Close the file */
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CloseHandle(hFile);
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DPRINT1("Memory dump done\n");
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}
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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*/ 0, MAX_ADDRESS);
|
|
if (BaseAddress == NULL)
|
|
{
|
|
wprintf(L"FATAL: Failed to allocate VDM memory.\n");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* For diagnostics purposes, we fill the memory with INT 0x03 codes
|
|
* so that if a program wants to execute random code in memory, we can
|
|
* retrieve the exact CS:IP where the problem happens.
|
|
*/
|
|
RtlFillMemory(BaseAddress, MAX_ADDRESS, 0xCC);
|
|
|
|
/* Initialize I/O ports */
|
|
/* Initialize RAM */
|
|
|
|
/* Initialize the CPU */
|
|
|
|
/* Initialize the internal clock */
|
|
if (!ClockInitialize())
|
|
{
|
|
wprintf(L"FATAL: Failed to initialize the clock\n");
|
|
return FALSE;
|
|
}
|
|
|
|
/* Initialize the CPU */
|
|
CpuInitialize();
|
|
// Fast486Initialize(&EmulatorContext,
|
|
// EmulatorReadMemory,
|
|
// EmulatorWriteMemory,
|
|
// EmulatorReadIo,
|
|
// EmulatorWriteIo,
|
|
// NULL,
|
|
// EmulatorBiosOperation,
|
|
// EmulatorIntAcknowledge,
|
|
// NULL /* TODO: Use a TLB */);
|
|
|
|
/* Initialize DMA */
|
|
|
|
/* Initialize the PIC, the PIT, the CMOS and the PC Speaker */
|
|
PicInitialize();
|
|
PitInitialize();
|
|
CmosInitialize();
|
|
SpeakerInitialize();
|
|
|
|
/* Set output functions */
|
|
PitSetOutFunction(0, NULL, PitChan0Out);
|
|
PitSetOutFunction(1, NULL, PitChan1Out);
|
|
PitSetOutFunction(2, NULL, PitChan2Out);
|
|
|
|
/* Register the I/O Ports */
|
|
RegisterIoPort(CONTROL_SYSTEM_PORT61H, Port61hRead, Port61hWrite);
|
|
|
|
/* Set the console input mode */
|
|
// FIXME: Activate ENABLE_WINDOW_INPUT when we will want to perform actions
|
|
// upon console window events (screen buffer resize, ...).
|
|
SetConsoleMode(ConsoleInput, ENABLE_PROCESSED_INPUT /* | ENABLE_WINDOW_INPUT */);
|
|
// SetConsoleMode(ConsoleOutput, ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT);
|
|
|
|
/**/EnableExtraHardware(ConsoleInput);/**/
|
|
|
|
/* Initialize the PS/2 port */
|
|
PS2Initialize();
|
|
|
|
/* Initialize the keyboard and mouse and connect them to their PS/2 ports */
|
|
KeyboardInit(0);
|
|
MouseInit(1);
|
|
|
|
/**************** ATTACH INPUT WITH CONSOLE *****************/
|
|
/* Start the input thread */
|
|
InputThread = CreateThread(NULL, 0, &PumpConsoleInput, ConsoleInput, 0, NULL);
|
|
if (InputThread == NULL)
|
|
{
|
|
DisplayMessage(L"Failed to create the console input thread.");
|
|
return FALSE;
|
|
}
|
|
/************************************************************/
|
|
|
|
/* Initialize the VGA */
|
|
if (!VgaInitialize(ConsoleOutput))
|
|
{
|
|
DisplayMessage(L"Failed to initialize VGA support.");
|
|
return FALSE;
|
|
}
|
|
|
|
/* Initialize the software callback system and register the emulator BOPs */
|
|
InitializeInt32();
|
|
RegisterBop(BOP_DEBUGGER , EmulatorDebugBreakBop);
|
|
// RegisterBop(BOP_UNSIMULATE, CpuUnsimulateBop);
|
|
|
|
/* Initialize VDD support */
|
|
VDDSupInitialize();
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
VOID EmulatorCleanup(VOID)
|
|
{
|
|
VgaCleanup();
|
|
|
|
/* Close the input thread handle */
|
|
if (InputThread != NULL) CloseHandle(InputThread);
|
|
InputThread = NULL;
|
|
|
|
PS2Cleanup();
|
|
|
|
SpeakerCleanup();
|
|
CmosCleanup();
|
|
// PitCleanup();
|
|
// PicCleanup();
|
|
|
|
CpuCleanup();
|
|
|
|
/* Free the memory allocated for the 16-bit address space */
|
|
if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
|
|
}
|
|
|
|
|
|
|
|
VOID
|
|
WINAPI
|
|
VDDSimulate16(VOID)
|
|
{
|
|
CpuSimulate();
|
|
}
|
|
|
|
VOID
|
|
WINAPI
|
|
VDDTerminateVDM(VOID)
|
|
{
|
|
/* Stop the VDM */
|
|
EmulatorTerminate();
|
|
}
|
|
|
|
PBYTE
|
|
WINAPI
|
|
Sim32pGetVDMPointer(IN ULONG Address,
|
|
IN BOOLEAN ProtectedMode)
|
|
{
|
|
// FIXME
|
|
UNREFERENCED_PARAMETER(ProtectedMode);
|
|
|
|
/*
|
|
* HIWORD(Address) == Segment (if ProtectedMode == FALSE)
|
|
* or Selector (if ProtectedMode == TRUE )
|
|
* LOWORD(Address) == Offset
|
|
*/
|
|
return (PBYTE)FAR_POINTER(Address);
|
|
}
|
|
|
|
PBYTE
|
|
WINAPI
|
|
MGetVdmPointer(IN ULONG Address,
|
|
IN ULONG Size,
|
|
IN BOOLEAN ProtectedMode)
|
|
{
|
|
UNREFERENCED_PARAMETER(Size);
|
|
return Sim32pGetVDMPointer(Address, ProtectedMode);
|
|
}
|
|
|
|
PVOID
|
|
WINAPI
|
|
VdmMapFlat(IN USHORT Segment,
|
|
IN ULONG Offset,
|
|
IN VDM_MODE Mode)
|
|
{
|
|
// FIXME
|
|
UNREFERENCED_PARAMETER(Mode);
|
|
|
|
return SEG_OFF_TO_PTR(Segment, Offset);
|
|
}
|
|
|
|
BOOL
|
|
WINAPI
|
|
VdmFlushCache(IN USHORT Segment,
|
|
IN ULONG Offset,
|
|
IN ULONG Size,
|
|
IN VDM_MODE Mode)
|
|
{
|
|
// FIXME
|
|
UNIMPLEMENTED;
|
|
return TRUE;
|
|
}
|
|
|
|
BOOL
|
|
WINAPI
|
|
VdmUnmapFlat(IN USHORT Segment,
|
|
IN ULONG Offset,
|
|
IN PVOID Buffer,
|
|
IN VDM_MODE Mode)
|
|
{
|
|
// FIXME
|
|
UNIMPLEMENTED;
|
|
return TRUE;
|
|
}
|
|
|
|
/* EOF */
|