mirror of
https://github.com/libretro/blueMSX-libretro.git
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154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*****************************************************************************
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** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Memory/romMapperKonami4.c,v $
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**
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** $Revision: 1.8 $
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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 "romMapperKonami4.h"
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#include "MediaDb.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 <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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UInt8* romData;
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int slot;
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int sslot;
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int startPage;
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int size;
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int romMapper[4];
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} RomMapperKonami4;
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static void saveState(RomMapperKonami4* rm)
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{
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SaveState* state = saveStateOpenForWrite("mapperKonami4");
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char tag[16];
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int i;
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for (i = 0; i < 4; i++) {
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sprintf(tag, "romMapper%d", i);
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saveStateSet(state, tag, rm->romMapper[i]);
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}
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saveStateClose(state);
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}
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static void loadState(RomMapperKonami4* rm)
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{
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SaveState* state = saveStateOpenForRead("mapperKonami4");
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char tag[16];
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int i;
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for (i = 0; i < 4; i++) {
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sprintf(tag, "romMapper%d", i);
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rm->romMapper[i] = saveStateGet(state, tag, 0);
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}
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saveStateClose(state);
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for (i = 0; i < 4; i++) {
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slotMapPage(rm->slot, rm->sslot, rm->startPage + i, rm->romData + rm->romMapper[i] * 0x2000, 1, 0);
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}
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}
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static void destroy(RomMapperKonami4* rm)
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{
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slotUnregister(rm->slot, rm->sslot, rm->startPage);
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deviceManagerUnregister(rm->deviceHandle);
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free(rm->romData);
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free(rm);
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}
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static void write(RomMapperKonami4* rm, UInt16 address, UInt8 value)
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{
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int bank;
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address += 0x4000;
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/* Page at 4000h is fixed */
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if (address < 0x6000 || address >= 0xc000) {
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return;
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}
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bank = (address - 0x4000) >> 13;
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value %= rm->size / 0x2000;
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if (rm->romMapper[bank] != value) {
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UInt8* bankData = rm->romData + ((int)value << 13);
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rm->romMapper[bank] = value;
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slotMapPage(rm->slot, rm->sslot, rm->startPage + bank, bankData, 1, 0);
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}
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}
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int romMapperKonami4Create(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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RomMapperKonami4* rm;
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int romSize;
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int i;
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if (size < 0x8000) {
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return 0;
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}
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rm = malloc(sizeof(RomMapperKonami4));
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rm->deviceHandle = deviceManagerRegister(ROM_KONAMI4, &callbacks, rm);
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slotRegister(slot, sslot, startPage, 4, NULL, NULL, write, destroy, rm);
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romSize = size > 0x40000 ? size : 0x40000;
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rm->romData = malloc(romSize);
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memcpy(rm->romData, romData, size);
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if (size < 0x40000) {
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memset(rm->romData + size, 0xff, 0x40000 - size);
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}
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rm->size = romSize;
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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->romMapper[0] = 0;
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rm->romMapper[1] = 1;
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rm->romMapper[2] = 2;
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rm->romMapper[3] = 3;
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for (i = 0; i < 4; i++) {
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slotMapPage(rm->slot, rm->sslot, rm->startPage + i, rm->romData + rm->romMapper[i] * 0x2000, 1, 0);
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}
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return 1;
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}
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