mirror of
https://github.com/reactos/reactos.git
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139 lines
3.3 KiB
C
139 lines
3.3 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: subsystems/mvdm/ntvdm/emulator.h
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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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#ifndef _EMULATOR_H_
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#define _EMULATOR_H_
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/* INCLUDES *******************************************************************/
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#include <fast486.h>
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/* DEFINES ********************************************************************/
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/*
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* Basic Memory Management
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*/
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#define NULL32 ((ULONG)0)
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#define MEM_ALIGN_DOWN(ptr, align) (PVOID)((ULONG_PTR)(ptr) & ~((align) - 1l))
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#define MEM_ALIGN_UP(ptr, align) MEM_ALIGN_DOWN((ULONG_PTR)(ptr) + (align) - 1l, (align))
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#define TO_LINEAR(seg, off) (((seg) << 4) + (off))
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#define MAX_SEGMENT 0xFFFF
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#define MAX_OFFSET 0xFFFF
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#define MAX_ADDRESS 0x1000000 // 16 MB of RAM; see also: kernel32/client/vdm.c!BaseGetVdmConfigInfo
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C_ASSERT(0x100000 <= MAX_ADDRESS); // A minimum of 1 MB is required for PC emulation.
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#define SEG_OFF_TO_PTR(seg, off) \
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(PVOID)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), (off)))
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#define FAR_POINTER(x) SEG_OFF_TO_PTR(HIWORD(x), LOWORD(x))
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#define REAL_TO_PHYS(ptr) (PVOID)((ULONG_PTR)(ptr) + (ULONG_PTR)BaseAddress)
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#define PHYS_TO_REAL(ptr) (PVOID)((ULONG_PTR)(ptr) - (ULONG_PTR)BaseAddress)
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#define ARRAY_INDEX(ptr, array) ((ULONG)(((ULONG_PTR)(ptr) - (ULONG_PTR)(array)) / sizeof(*array)))
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/*
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* BCD-Binary conversion
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*/
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FORCEINLINE
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USHORT
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BINARY_TO_BCD(USHORT Value)
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{
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USHORT Result;
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Result = (Value / 1000) << 12;
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Value %= 1000;
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Result |= (Value / 100) << 8;
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Value %= 100;
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Result |= (Value / 10) << 4;
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Value %= 10;
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Result |= Value;
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return Result;
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}
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FORCEINLINE
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USHORT
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BCD_TO_BINARY(USHORT Value)
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{
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USHORT Result;
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Result = Value & 0xF;
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Value >>= 4;
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Result += (Value & 0xF) * 10;
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Value >>= 4;
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Result += (Value & 0xF) * 100;
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Value >>= 4;
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Result += Value * 1000;
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return Result;
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}
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/*
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* Emulator state
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*/
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enum
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{
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EMULATOR_EXCEPTION_DIVISION_BY_ZERO,
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EMULATOR_EXCEPTION_DEBUG,
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EMULATOR_EXCEPTION_NMI,
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EMULATOR_EXCEPTION_BREAKPOINT,
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EMULATOR_EXCEPTION_OVERFLOW,
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EMULATOR_EXCEPTION_BOUND,
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EMULATOR_EXCEPTION_INVALID_OPCODE,
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EMULATOR_EXCEPTION_NO_FPU,
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EMULATOR_EXCEPTION_DOUBLE_FAULT,
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EMULATOR_EXCEPTION_FPU_SEGMENT,
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EMULATOR_EXCEPTION_INVALID_TSS,
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EMULATOR_EXCEPTION_NO_SEGMENT,
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EMULATOR_EXCEPTION_STACK_SEGMENT,
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EMULATOR_EXCEPTION_GPF,
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EMULATOR_EXCEPTION_PAGE_FAULT
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};
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extern FAST486_STATE EmulatorContext;
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extern LPVOID BaseAddress;
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extern BOOLEAN VdmRunning;
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/* FUNCTIONS ******************************************************************/
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VOID DumpMemory(BOOLEAN TextFormat);
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VOID MountFloppy(IN ULONG DiskNumber);
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VOID EjectFloppy(IN ULONG DiskNumber);
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UCHAR FASTCALL EmulatorIntAcknowledge
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(
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PFAST486_STATE State
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);
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VOID FASTCALL EmulatorFpu
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(
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PFAST486_STATE State
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);
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VOID EmulatorInterruptSignal(VOID);
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VOID EmulatorException(BYTE ExceptionNumber, LPWORD Stack);
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VOID EmulatorPause(VOID);
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VOID EmulatorResume(VOID);
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VOID EmulatorTerminate(VOID);
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BOOLEAN EmulatorInitialize(HANDLE ConsoleInput, HANDLE ConsoleOutput);
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VOID EmulatorCleanup(VOID);
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#endif // _EMULATOR_H_
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/* EOF */
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