133 lines
3.5 KiB
C
Executable File
133 lines
3.5 KiB
C
Executable File
/*****************************************************************************
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** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Memory/romMapperTurboRTimer.c,v $
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**
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** $Revision: 1.5 $
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**
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** $Date: 2008-03-30 18:38:44 $
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**
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** More info: http://www.bluemsx.com
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**
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** Copyright (C) 2003-2006 Daniel Vik
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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******************************************************************************
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*/
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#include "romMapperTurboRTimer.h"
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#include "MediaDb.h"
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#include "DeviceManager.h"
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#include "SaveState.h"
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#include "Board.h"
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#include "IoPort.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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typedef struct {
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int deviceHandle;
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UInt32 counter;
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UInt32 refTime;
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UInt32 refFrag;
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} RomMapperTurboRTimer;
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static RomMapperTurboRTimer* theTimer = NULL;
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static void saveState(RomMapperTurboRTimer* rm)
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{
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SaveState* state = saveStateOpenForWrite("mapperTurboRTimer");
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saveStateSet(state, "counter", rm->counter);
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saveStateSet(state, "refTime", rm->refTime);
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saveStateSet(state, "refFrag", rm->refFrag);
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saveStateClose(state);
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}
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static void loadState(RomMapperTurboRTimer* rm)
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{
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SaveState* state = saveStateOpenForRead("mapperTurboRTimer");
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rm->counter = saveStateGet(state, "counter", 0);
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rm->refTime = saveStateGet(state, "refTime", boardSystemTime());
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rm->refFrag = saveStateGet(state, "refFrag", 0);
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saveStateClose(state);
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}
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static void destroy(RomMapperTurboRTimer* rm)
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{
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deviceManagerUnregister(rm->deviceHandle);
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ioPortUnregister(0xe6);
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ioPortUnregister(0xe7);
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free(rm);
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theTimer = NULL;
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}
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void romMapperTurboRTimerSync()
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{
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if (theTimer != NULL) {
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UInt32 systemTime = boardSystemTime();
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UInt64 elapsed = 255682 * (UInt64)(systemTime - theTimer->refTime) + theTimer->refFrag;
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theTimer->refTime = systemTime;
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theTimer->refFrag = (UInt32)(elapsed % boardFrequency());
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theTimer->counter += (UInt32)(elapsed / boardFrequency());
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}
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}
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static UInt8 read(RomMapperTurboRTimer* rm, UInt16 ioPort)
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{
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romMapperTurboRTimerSync();
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switch (ioPort & 0x01) {
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case 0:
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return (UInt8)(rm->counter & 0xff);
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case 1:
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return (UInt8)((rm->counter >> 8) & 0xff);
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}
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return 0xff;
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}
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static void write(RomMapperTurboRTimer* rm, UInt16 ioPort, UInt8 value)
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{
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theTimer->counter = 0;
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rm->refTime = boardSystemTime();
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rm->refFrag = 0;
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}
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int romMapperTurboRTimerCreate()
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{
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DeviceCallbacks callbacks = { destroy, NULL, saveState, loadState };
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RomMapperTurboRTimer* rm = malloc(sizeof(RomMapperTurboRTimer));
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rm->deviceHandle = deviceManagerRegister(ROM_TURBORTIMER, &callbacks, rm);
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rm->refTime = boardSystemTime();
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rm->refFrag = 0;
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rm->counter = 0;
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ioPortRegister(0xe6, read, write, rm);
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ioPortRegister(0xe7, read, write, rm);
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theTimer = rm;
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return 1;
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}
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