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56 lines
1.3 KiB
C
56 lines
1.3 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: timer.h
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* PURPOSE: Programmable Interval Timer emulation (header file)
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*/
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#ifndef _TIMER_H_
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#define _TIMER_H_
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/* INCLUDES *******************************************************************/
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#include "ntvdm.h"
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/* DEFINES ********************************************************************/
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#define PIT_CHANNELS 3
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#define PIT_BASE_FREQUENCY 1193182LL
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#define PIT_DATA_PORT(x) (0x40 + (x))
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#define PIT_COMMAND_PORT 0x43
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enum
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{
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PIT_MODE_INT_ON_TERMINAL_COUNT,
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PIT_MODE_HARDWARE_ONE_SHOT,
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PIT_MODE_RATE_GENERATOR,
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PIT_MODE_SQUARE_WAVE,
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PIT_MODE_SOFTWARE_STROBE,
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PIT_MODE_HARDWARE_STROBE
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};
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typedef struct _PIT_CHANNEL
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{
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WORD ReloadValue;
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WORD CurrentValue;
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WORD LatchedValue;
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INT Mode;
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BOOLEAN Pulsed;
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BOOLEAN LatchSet;
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BOOLEAN InputFlipFlop;
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BOOLEAN OutputFlipFlop;
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BYTE AccessMode;
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} PIT_CHANNEL, *PPIT_CHANNEL;
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/* FUNCTIONS ******************************************************************/
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VOID PitWriteCommand(BYTE Value);
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BYTE PitReadData(BYTE Channel);
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VOID PitWriteData(BYTE Channel, BYTE Value);
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VOID PitDecrementCount();
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#endif // _TIMER_H_
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/* EOF */
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