mirror of
https://github.com/reactos/reactos.git
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90d7fbd4a8
Revert a previous incorrect fix for the PIT. Modify the PitDecrementCount function to take a parameter instead of it being called multiple times (which is slower). svn path=/branches/ntvdm/; revision=60816
197 lines
5 KiB
C
197 lines
5 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: ntvdm.c
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* PURPOSE: Virtual DOS Machine
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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 "ntvdm.h"
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#include "emulator.h"
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#include "bios.h"
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#include "vga.h"
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#include "dos.h"
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#include "timer.h"
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#include "pic.h"
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#include "ps2.h"
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/*
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* Activate this line if you want to be able to test NTVDM with:
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* ntvdm.exe <program>
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*/
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#define TESTING
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/* PUBLIC VARIABLES ***********************************************************/
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BOOLEAN VdmRunning = TRUE;
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LPVOID BaseAddress = NULL;
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/* PUBLIC FUNCTIONS ***********************************************************/
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VOID DisplayMessage(LPCWSTR Format, ...)
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{
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WCHAR Buffer[256];
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va_list Parameters;
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va_start(Parameters, Format);
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_vsnwprintf(Buffer, 256, Format, Parameters);
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MessageBoxW(NULL, Buffer, L"NTVDM Subsystem", MB_OK);
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va_end(Parameters);
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}
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BOOL WINAPI ConsoleCtrlHandler(DWORD ControlType)
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{
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switch (ControlType)
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{
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case CTRL_C_EVENT:
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case CTRL_BREAK_EVENT:
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{
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/* Perform interrupt 0x23 */
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EmulatorInterrupt(0x23);
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break;
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}
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default:
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{
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/* Stop the VDM if the user logs out or closes the console */
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VdmRunning = FALSE;
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}
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}
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return TRUE;
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}
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INT wmain(INT argc, WCHAR *argv[])
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{
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INT i;
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CHAR CommandLine[DOS_CMDLINE_LENGTH];
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DWORD CurrentTickCount;
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DWORD Cycles = 0;
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DWORD LastCyclePrintout = GetTickCount();
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DWORD LastVerticalRefresh = GetTickCount();
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LARGE_INTEGER Frequency, LastTimerTick, Counter;
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LONGLONG TimerTicks;
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HANDLE InputThread = NULL;
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/* Set the handler routine */
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SetConsoleCtrlHandler(ConsoleCtrlHandler, TRUE);
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#ifndef TESTING
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UNREFERENCED_PARAMETER(argc);
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UNREFERENCED_PARAMETER(argv);
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/* The DOS command line must be ASCII */
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WideCharToMultiByte(CP_ACP, 0, GetCommandLine(), -1, CommandLine, sizeof(CommandLine), NULL, NULL);
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#else
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if (argc == 2 && argv[1] != NULL)
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{
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WideCharToMultiByte(CP_ACP, 0, argv[1], -1, CommandLine, sizeof(CommandLine), NULL, NULL);
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}
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else
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{
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wprintf(L"\nReactOS Virtual DOS Machine\n\n"
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L"Usage: NTVDM <executable>\n");
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return 0;
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}
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#endif
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if (!EmulatorInitialize())
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{
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wprintf(L"FATAL: Failed to initialize the CPU emulator\n");
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goto Cleanup;
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}
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/* Initialize the performance counter (needed for hardware timers) */
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if (!QueryPerformanceFrequency(&Frequency))
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{
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wprintf(L"FATAL: Performance counter not available\n");
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goto Cleanup;
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}
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/* Initialize the system BIOS */
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if (!BiosInitialize())
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{
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wprintf(L"FATAL: Failed to initialize the VDM BIOS.\n");
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goto Cleanup;
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}
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/* Initialize the VDM DOS kernel */
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if (!DosInitialize())
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{
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wprintf(L"FATAL: Failed to initialize the VDM DOS kernel.\n");
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goto Cleanup;
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}
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/* Start the process from the command line */
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if (!DosCreateProcess(CommandLine, 0))
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{
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DisplayMessage(L"Could not start program: %S", CommandLine);
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return -1;
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}
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/* Start the input thread */
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InputThread = CreateThread(NULL, 0, &InputThreadProc, NULL, 0, NULL);
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/* Set the last timer tick to the current time */
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QueryPerformanceCounter(&LastTimerTick);
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/* Main loop */
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while (VdmRunning)
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{
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/* Get the current number of ticks */
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CurrentTickCount = GetTickCount();
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/* Get the current performance counter value */
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QueryPerformanceCounter(&Counter);
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/* Get the number of PIT ticks that have passed */
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TimerTicks = ((Counter.QuadPart - LastTimerTick.QuadPart)
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* PIT_BASE_FREQUENCY) / Frequency.QuadPart;
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/* Update the PIT */
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if (TimerTicks > 0)
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{
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PitDecrementCount(TimerTicks);
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LastTimerTick = Counter;
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}
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/* Check for vertical retrace */
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if ((CurrentTickCount - LastVerticalRefresh) >= 16)
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{
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VgaRefreshDisplay();
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LastVerticalRefresh = CurrentTickCount;
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}
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/* Horizontal retrace occurs as fast as possible */
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VgaHorizontalRetrace();
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/* Continue CPU emulation */
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for (i = 0; (i < STEPS_PER_CYCLE) && VdmRunning; i++)
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{
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EmulatorStep();
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Cycles++;
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}
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if ((CurrentTickCount - LastCyclePrintout) >= 1000)
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{
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DPRINT1("NTVDM: %lu Instructions Per Second\n", Cycles);
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LastCyclePrintout = CurrentTickCount;
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Cycles = 0;
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}
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}
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/* Perform another screen refresh */
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VgaRefreshDisplay();
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Cleanup:
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if (InputThread != NULL) CloseHandle(InputThread);
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BiosCleanup();
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EmulatorCleanup();
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return 0;
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}
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/* EOF */
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