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- Move some PS/2 initialization from bios.c to ps2.c - NULLify interrupt entries which are in fact pointers to data tables. - Add a framework for adding I/O port handlers. svn path=/branches/ntvdm/; revision=61107
59 lines
1.4 KiB
C
59 lines
1.4 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
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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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extern PPIT_CHANNEL PitChannel2; // Needed for PC Speaker
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/* FUNCTIONS ******************************************************************/
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VOID PitWriteCommand(BYTE Value);
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VOID PitWriteData(BYTE Channel, BYTE Value);
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VOID PitDecrementCount(DWORD Count);
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DWORD PitGetResolution(VOID);
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BOOLEAN PitInitialize(VOID);
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#endif // _TIMER_H_
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/* EOF */
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