+++ /dev/null
-/*
- * COPYRIGHT: GPL - See COPYING in the top level directory
- * PROJECT: ReactOS Virtual DOS Machine
- * FILE: subsystems/mvdm/ntvdm/cpu/cpu.c
- * PURPOSE: Minimal x86 machine emulator for the VDM
- * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
- */
-
-/* INCLUDES *******************************************************************/
-
-#include "ntvdm.h"
-
-#define NDEBUG
-#include <debug.h>
-
-#include "emulator.h"
-#include "cpu.h"
-
-#include "memory.h"
-#include "callback.h"
-#include "bop.h"
-#include <isvbop.h>
-
-#include "clock.h"
-#include "bios/rom.h"
-#include "hardware/cmos.h"
-#include "hardware/keyboard.h"
-#include "hardware/mouse.h"
-#include "hardware/pic.h"
-#include "hardware/ps2.h"
-#include "hardware/sound/speaker.h"
-#include "hardware/pit.h"
-#include "hardware/video/svga.h"
-
-#include "io.h"
-
-/* PRIVATE VARIABLES **********************************************************/
-
-FAST486_STATE EmulatorContext;
-BOOLEAN CpuRunning = FALSE;
-
-/* No more than 'MaxCpuCallLevel' recursive CPU calls are allowed */
-static const INT MaxCpuCallLevel = 32;
-static INT CpuCallLevel = 0; // == 0: CPU stopped; >= 1: CPU running or halted
-
-#if 0
-LPCWSTR ExceptionName[] =
-{
- L"Division By Zero",
- L"Debug",
- L"Unexpected Error",
- L"Breakpoint",
- L"Integer Overflow",
- L"Bound Range Exceeded",
- L"Invalid Opcode",
- L"FPU Not Available"
-};
-#endif
-
-// /* BOP Identifiers */
-// #define BOP_DEBUGGER 0x56 // Break into the debugger from a 16-bit app
-
-/* PRIVATE FUNCTIONS **********************************************************/
-
-#if 0
-VOID EmulatorException(BYTE ExceptionNumber, LPWORD Stack)
-{
- WORD CodeSegment, InstructionPointer;
- PBYTE Opcode;
-
- ASSERT(ExceptionNumber < 8);
-
- /* Get the CS:IP */
- InstructionPointer = Stack[STACK_IP];
- CodeSegment = Stack[STACK_CS];
- Opcode = (PBYTE)SEG_OFF_TO_PTR(CodeSegment, InstructionPointer);
-
- /* Display a message to the user */
- DisplayMessage(L"Exception: %s occured at %04X:%04X\n"
- L"Opcode: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X",
- ExceptionName[ExceptionNumber],
- CodeSegment,
- InstructionPointer,
- Opcode[0],
- Opcode[1],
- Opcode[2],
- Opcode[3],
- Opcode[4],
- Opcode[5],
- Opcode[6],
- Opcode[7],
- Opcode[8],
- Opcode[9]);
-
- /* Stop the VDM */
- EmulatorTerminate();
- return;
-}
-#endif
-
-// FIXME: This function assumes 16-bit mode!!!
-VOID CpuExecute(WORD Segment, WORD Offset)
-{
- /* Tell Fast486 to move the instruction pointer */
- Fast486ExecuteAt(&EmulatorContext, Segment, Offset);
-}
-
-VOID CpuStep(VOID)
-{
- /* Dump the state for debugging purposes */
- // Fast486DumpState(&EmulatorContext);
-
- /* Execute the next instruction */
- Fast486StepInto(&EmulatorContext);
-}
-
-LONG CpuExceptionFilter(IN PEXCEPTION_POINTERS ExceptionInfo)
-{
- /* Get the exception record */
- PEXCEPTION_RECORD ExceptionRecord = ExceptionInfo->ExceptionRecord;
-
- switch (ExceptionRecord->ExceptionCode)
- {
- /* We only handle access violations so far */
- case EXCEPTION_ACCESS_VIOLATION:
- {
- BOOLEAN Writing = (ExceptionRecord->ExceptionInformation[0] == 1);
-
- /* Retrieve the address to which a read or write attempt was made */
- ULONG_PTR Address = ExceptionRecord->ExceptionInformation[1];
-
- /*
- * Check whether the access exception was done inside the virtual memory space
- * (caused by an emulated app) or outside (casued by a bug in ourselves).
- */
- if (Address < (ULONG_PTR)BaseAddress ||
- Address >= (ULONG_PTR)BaseAddress + MAX_ADDRESS)
- {
- DPRINT1("NTVDM: %s access violation at 0x%p outside the virtual memory space!\n",
- (Writing ? "Write" : "Read"), Address);
- return EXCEPTION_CONTINUE_SEARCH;
- }
-
- /* We are good to go, dispatch to our memory handlers */
-
- /* Fix the CPU state */
- Fast486Rewind(&EmulatorContext);
-
- /* Call the memory handler */
- MemExceptionHandler((ULONG)PHYS_TO_REAL(Address), Writing);
-
- /* The execution of the CPU opcode handler MUST NOT continue */
- return EXCEPTION_EXECUTE_HANDLER;
- }
-
- default:
- {
- DPRINT1("NTVDM: Exception 0x%08lx not handled!\n", ExceptionRecord->ExceptionCode);
- break;
- }
- }
-
- /* Continue to search for a handler */
- return EXCEPTION_CONTINUE_SEARCH;
-}
-
-VOID CpuSimulate(VOID)
-{
- if (CpuCallLevel > MaxCpuCallLevel)
- {
- DisplayMessage(L"Too many CPU levels of recursion (%d, expected maximum %d)",
- CpuCallLevel, MaxCpuCallLevel);
-
- /* Stop the VDM */
- EmulatorTerminate();
- return;
- }
- CpuCallLevel++;
- DPRINT("CpuSimulate --> Level %d\n", CpuCallLevel);
-
- CpuRunning = TRUE;
- while (VdmRunning && CpuRunning)
- {
- _SEH2_TRY
- {
- while (VdmRunning && CpuRunning) ClockUpdate();
- }
- _SEH2_EXCEPT(CpuExceptionFilter(_SEH2_GetExceptionInformation()))
- {
- DPRINT("VDM exception handler called\n");
- }
- _SEH2_END;
- }
-
- DPRINT("CpuSimulate <-- Level %d\n", CpuCallLevel);
- CpuCallLevel--;
- if (!VdmRunning || CpuCallLevel < 0) CpuCallLevel = 0;
-
- /* This takes into account for reentrance */
- if (VdmRunning && (CpuCallLevel > 0)) CpuRunning = TRUE;
-}
-
-VOID CpuUnsimulate(VOID)
-{
- /* Stop simulation */
- CpuRunning = FALSE;
-}
-
-static VOID WINAPI CpuUnsimulateBop(LPWORD Stack)
-{
- CpuUnsimulate();
-}
-
-/* PUBLIC FUNCTIONS ***********************************************************/
-
-BOOLEAN CpuInitialize(VOID)
-{
- // /* Initialize the internal clock */
- // if (!ClockInitialize())
- // {
- // wprintf(L"FATAL: Failed to initialize the clock\n");
- // return FALSE;
- // }
-
- /* Initialize the CPU */
- Fast486Initialize(&EmulatorContext,
- EmulatorReadMemory,
- EmulatorWriteMemory,
- EmulatorReadIo,
- EmulatorWriteIo,
- EmulatorBiosOperation,
- EmulatorIntAcknowledge,
- EmulatorFpu,
- NULL /* TODO: Use a TLB */);
-
- /* Initialize the software callback system and register the emulator BOPs */
- // RegisterBop(BOP_DEBUGGER , EmulatorDebugBreakBop);
- RegisterBop(BOP_UNSIMULATE, CpuUnsimulateBop);
-
- return TRUE;
-}
-
-VOID CpuCleanup(VOID)
-{
- // Fast486Cleanup();
-}
-
-/* EOF */
projects / reactos.git / blobdiff