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88 lines
2.4 KiB
C
88 lines
2.4 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: subsystems/mvdm/ntvdm/hardware/ppi.c
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* PURPOSE: Programmable Peripheral Interface emulation -
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* i8255A-5 compatible
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* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*
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* NOTES: - Most of its functionality as keyboard controller is replaced
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* by the PS/2 controller.
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* - This controller is here only for having ports 61h and 62h working.
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*/
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/* INCLUDES *******************************************************************/
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#include "ntvdm.h"
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#define NDEBUG
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#include <debug.h>
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#include "emulator.h"
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#include "ppi.h"
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#include "hardware/pit.h"
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#include "hardware/sound/speaker.h"
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#include "io.h"
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/* PRIVATE VARIABLES **********************************************************/
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/*static*/ BYTE Port61hState = 0x00; // Used in emulator.c
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static BYTE Port62hState = 0x00;
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/* PRIVATE FUNCTIONS **********************************************************/
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static BYTE WINAPI PpiReadPort(USHORT Port)
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{
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if (Port == PPI_PORT_61H)
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return Port61hState;
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else if (Port == PPI_PORT_62H)
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return Port62hState;
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return 0x00;
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}
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static VOID WINAPI Port61hWrite(USHORT Port, BYTE Data)
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{
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// BOOLEAN SpeakerStateChange = FALSE;
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BYTE OldPort61hState = Port61hState;
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/* Only the four lowest bytes can be written */
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Port61hState = (Port61hState & 0xF0) | (Data & 0x0F);
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if ((OldPort61hState ^ Port61hState) & 0x01)
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{
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DPRINT("PIT 2 Gate %s\n", Port61hState & 0x01 ? "on" : "off");
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PitSetGate(2, !!(Port61hState & 0x01));
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// SpeakerStateChange = TRUE;
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}
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if ((OldPort61hState ^ Port61hState) & 0x02)
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{
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/* There were some change for the speaker... */
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DPRINT("Speaker %s\n", Port61hState & 0x02 ? "on" : "off");
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// SpeakerStateChange = TRUE;
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}
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// if (SpeakerStateChange) SpeakerChange(Port61hState);
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SpeakerChange(Port61hState);
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}
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static VOID WINAPI Port62hWrite(USHORT Port, BYTE Data)
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{
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Port62hState = Data;
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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VOID PpiInitialize(VOID)
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{
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/* Register the I/O Ports */
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// Port 0x60 is now used by the PS/2 controller
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RegisterIoPort(PPI_PORT_61H, PpiReadPort, Port61hWrite);
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RegisterIoPort(PPI_PORT_62H, PpiReadPort, Port62hWrite);
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// Port 0x63 is unused
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}
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/* EOF */
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