2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
5 * PURPOSE: Virtual DOS Machine
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
9 /* INCLUDES *******************************************************************/
25 * Activate this line if you want to be able to test NTVDM with:
30 /* PUBLIC VARIABLES ***********************************************************/
32 BOOLEAN VdmRunning
= TRUE
;
33 LPVOID BaseAddress
= NULL
;
35 /* PUBLIC FUNCTIONS ***********************************************************/
37 VOID
DisplayMessage(LPCWSTR Format
, ...)
42 va_start(Parameters
, Format
);
43 _vsnwprintf(Buffer
, 256, Format
, Parameters
);
44 DPRINT1("\n\nNTVDM Subsystem\n%S\n\n", Buffer
);
45 MessageBoxW(NULL
, Buffer
, L
"NTVDM Subsystem", MB_OK
);
49 BOOL WINAPI
ConsoleCtrlHandler(DWORD ControlType
)
54 case CTRL_BREAK_EVENT
:
56 /* Perform interrupt 0x23 */
57 EmulatorInterrupt(0x23);
62 /* Stop the VDM if the user logs out or closes the console */
69 INT
wmain(INT argc
, WCHAR
*argv
[])
72 CHAR CommandLine
[DOS_CMDLINE_LENGTH
];
73 LARGE_INTEGER StartPerfCount
;
74 LARGE_INTEGER Frequency
, LastTimerTick
, LastRtcTick
, Counter
;
76 DWORD StartTickCount
, CurrentTickCount
;
77 DWORD LastClockUpdate
;
78 DWORD LastVerticalRefresh
;
79 DWORD LastCyclePrintout
;
81 INT KeyboardIntCounter
= 0;
83 /* Set the handler routine */
84 SetConsoleCtrlHandler(ConsoleCtrlHandler
, TRUE
);
87 UNREFERENCED_PARAMETER(argc
);
88 UNREFERENCED_PARAMETER(argv
);
90 /* The DOS command line must be ASCII */
91 WideCharToMultiByte(CP_ACP
, 0, GetCommandLine(), -1, CommandLine
, sizeof(CommandLine
), NULL
, NULL
);
93 if (argc
== 2 && argv
[1] != NULL
)
95 WideCharToMultiByte(CP_ACP
, 0, argv
[1], -1, CommandLine
, sizeof(CommandLine
), NULL
, NULL
);
99 wprintf(L
"\nReactOS Virtual DOS Machine\n\n"
100 L
"Usage: NTVDM <executable>\n");
105 DPRINT1("\n\n\nNTVDM - Starting '%s'...\n\n\n", CommandLine
);
107 /* Initialize the emulator */
108 if (!EmulatorInitialize())
110 wprintf(L
"FATAL: Failed to initialize the CPU emulator\n");
114 /* Initialize the performance counter (needed for hardware timers) */
115 if (!QueryPerformanceFrequency(&Frequency
))
117 wprintf(L
"FATAL: Performance counter not available\n");
121 /* Initialize the PIC */
122 if (!PicInitialize())
124 wprintf(L
"FATAL: Failed to initialize the PIC.\n");
128 /* Initialize the PIT */
129 if (!PitInitialize())
131 wprintf(L
"FATAL: Failed to initialize the PIT.\n");
135 /* Initialize the CMOS */
136 if (!CmosInitialize())
138 wprintf(L
"FATAL: Failed to initialize the VDM CMOS.\n");
142 /* Initialize the PC Speaker */
145 /* Initialize the system BIOS */
146 if (!BiosInitialize())
148 wprintf(L
"FATAL: Failed to initialize the VDM BIOS.\n");
152 /* Initialize the VDM DOS kernel */
153 if (!DosInitialize())
155 wprintf(L
"FATAL: Failed to initialize the VDM DOS kernel.\n");
159 /* Start the process from the command line */
160 if (!DosCreateProcess(CommandLine
, 0))
162 DisplayMessage(L
"Could not start program: %S", CommandLine
);
166 /* Find the starting performance and tick count */
167 StartTickCount
= GetTickCount();
168 QueryPerformanceCounter(&StartPerfCount
);
170 /* Set the different last counts to the starting count */
171 LastClockUpdate
= LastVerticalRefresh
= LastCyclePrintout
= StartTickCount
;
173 /* Set the last timer ticks to the current time */
174 LastTimerTick
= LastRtcTick
= StartPerfCount
;
179 DWORD PitResolution
= PitGetResolution();
180 DWORD RtcFrequency
= RtcGetTicksPerSecond();
182 /* Get the current number of ticks */
183 CurrentTickCount
= GetTickCount();
185 if ((PitResolution
<= 1000) && (RtcFrequency
<= 1000))
187 /* Calculate the approximate performance counter value instead */
188 Counter
.QuadPart
= StartPerfCount
.QuadPart
189 + (CurrentTickCount
- StartTickCount
)
190 * (Frequency
.QuadPart
/ 1000);
194 /* Get the current performance counter value */
195 QueryPerformanceCounter(&Counter
);
198 /* Get the number of PIT ticks that have passed */
199 TimerTicks
= ((Counter
.QuadPart
- LastTimerTick
.QuadPart
)
200 * PIT_BASE_FREQUENCY
) / Frequency
.QuadPart
;
205 PitDecrementCount(TimerTicks
);
206 LastTimerTick
= Counter
;
209 /* Check for RTC update */
210 if ((CurrentTickCount
- LastClockUpdate
) >= 1000)
213 LastClockUpdate
= CurrentTickCount
;
216 /* Check for RTC periodic tick */
217 if ((Counter
.QuadPart
- LastRtcTick
.QuadPart
)
218 >= (Frequency
.QuadPart
/ (LONGLONG
)RtcFrequency
))
221 LastRtcTick
= Counter
;
224 /* Check for vertical retrace */
225 if ((CurrentTickCount
- LastVerticalRefresh
) >= 15)
228 LastVerticalRefresh
= CurrentTickCount
;
231 KeyboardIntCounter
++;
232 if (KeyboardIntCounter
== KBD_INT_CYCLES
)
234 GenerateKeyboardInterrupts();
235 KeyboardIntCounter
= 0;
238 /* Horizontal retrace occurs as fast as possible */
239 VgaHorizontalRetrace();
241 /* Continue CPU emulation */
242 for (i
= 0; (i
< STEPS_PER_CYCLE
) && VdmRunning
; i
++)
248 if ((CurrentTickCount
- LastCyclePrintout
) >= 1000)
250 DPRINT1("NTVDM: %lu Instructions Per Second\n", Cycles
);
251 LastCyclePrintout
= CurrentTickCount
;
256 /* Perform another screen refresh */
265 DPRINT1("\n\n\nNTVDM - Exiting...\n\n\n");