161 lines
4.3 KiB
C
Executable File
161 lines
4.3 KiB
C
Executable File
/*****************************************************************************
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** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Memory/romMapperPAC.c,v $
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**
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** $Revision: 1.7 $
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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 "romMapperPAC.h"
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#include "MediaDb.h"
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#include "IoPort.h"
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#include "SlotManager.h"
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#include "DeviceManager.h"
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#include "SaveState.h"
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#include "sramLoader.h"
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#include <stdlib.h>
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#include <string.h>
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static char pacHeader[] = "PAC2 BACKUP DATA";
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typedef struct {
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int deviceHandle;
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UInt8 reg1ffe;
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UInt8 reg1fff;
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UInt8 sram[0x2000];
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char sramFilename[512];
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int slot;
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int sslot;
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int startPage;
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int sramEnabled;
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} RomMapperPAC;
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static void saveState(RomMapperPAC* rm)
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{
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SaveState* state = saveStateOpenForWrite("mapperPAC");
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saveStateSetBuffer(state, "sram", rm->sram, sizeof(rm->sram));
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saveStateClose(state);
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}
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static void loadState(RomMapperPAC* rm)
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{
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SaveState* state = saveStateOpenForRead("mapperPAC");
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saveStateGetBuffer(state, "sram", rm->sram, sizeof(rm->sram));
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saveStateClose(state);
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rm->sramEnabled = rm->sram[0x1ffe] == 0x4d && rm->sram[0x1fff] == 0x69;
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if (rm->sramEnabled) {
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slotMapPage(rm->slot, rm->sslot, rm->startPage, rm->sram, 1, 0);
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}
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else {
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slotUnmapPage(rm->slot, rm->sslot, rm->startPage);
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}
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}
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static void destroy(RomMapperPAC* rm)
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{
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sramSave(rm->sramFilename, rm->sram, 0x1ffe, pacHeader, strlen(pacHeader));
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slotUnregister(rm->slot, rm->sslot, rm->startPage);
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deviceManagerUnregister(rm->deviceHandle);
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free(rm);
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}
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static UInt8 read(RomMapperPAC* rm, UInt16 address)
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{
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switch (address & 0x3fff) {
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case 0x1ffe:
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return rm->sram[0x1ffe];
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case 0x1fff:
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return rm->sram[0x1fff];
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}
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return 0xff;
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}
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static void write(RomMapperPAC* rm, UInt16 address, UInt8 value)
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{
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int update = 0;
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address &= 0x3fff;
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switch (address) {
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case 0x1ffe:
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rm->sram[0x1ffe] = value;
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rm->sramEnabled = rm->sram[0x1ffe] == 0x4d && rm->sram[0x1fff] == 0x69;
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update = 1;
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break;
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case 0x1fff:
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rm->sram[0x1fff] = value;
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rm->sramEnabled = rm->sram[0x1ffe] == 0x4d && rm->sram[0x1fff] == 0x69;
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update = 1;
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break;
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default:
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if (rm->sramEnabled && address < 0x1ffe) {
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rm->sram[address] = value;
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}
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break;
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}
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if (update) {
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if (rm->sramEnabled) {
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slotMapPage(rm->slot, rm->sslot, rm->startPage, rm->sram, 1, 0);
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}
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else {
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slotMapPage(rm->slot, rm->sslot, rm->startPage, NULL, 0, 0);
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}
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}
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}
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int romMapperPACCreate(const char* filename, UInt8* romData,
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int size, int slot, int sslot, int startPage)
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{
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DeviceCallbacks callbacks = { destroy, NULL, saveState, loadState };
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RomMapperPAC* rm;
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rm = malloc(sizeof(RomMapperPAC));
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rm->deviceHandle = deviceManagerRegister(ROM_PAC, &callbacks, rm);
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slotRegister(slot, sslot, startPage, 2, read, read, write, destroy, rm);
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memset(rm->sram, 0xff, 0x2000);
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rm->slot = slot;
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rm->sslot = sslot;
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rm->startPage = startPage;
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rm->sramEnabled = 0;
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strcpy(rm->sramFilename, sramCreateFilename(filename));
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sramLoad(rm->sramFilename, rm->sram, 0x1ffe, pacHeader, strlen(pacHeader));
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slotMapPage(rm->slot, rm->sslot, rm->startPage, NULL, 0, 0);
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slotMapPage(rm->slot, rm->sslot, rm->startPage + 1, NULL, 0, 0);
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return 1;
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}
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