153 lines
4.2 KiB
C
Executable File
153 lines
4.2 KiB
C
Executable File
/*****************************************************************************
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** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Memory/romMapperDRAM.c,v $
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**
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** $Revision: 1.6 $
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**
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** $Date: 2009-07-03 21:27:14 $
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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 "romMapperDRAM.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 "Board.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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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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struct {
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PanasonicDramCallback callback;
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void* ref;
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} DramCallbacks[8];
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int panasonicDramRegister(PanasonicDramCallback callback, void* ref)
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{
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int i;
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for (i = 0; i < 8; i++) {
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if (DramCallbacks[i].callback == NULL) {
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DramCallbacks[i].callback = callback;
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DramCallbacks[i].ref = ref;
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return i;
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}
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}
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return -1;
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}
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void panasonicDramUnregister(int sramHandle)
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{
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if (sramHandle >=0 && sramHandle < 8) {
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DramCallbacks[sramHandle].callback = NULL;
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}
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}
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void panasonicDramUpdate(int mode)
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{
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int i;
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for (i = 0; i < 8; i++) {
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if (DramCallbacks[i].callback != NULL) {
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DramCallbacks[i].callback(DramCallbacks[i].ref, mode);
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}
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}
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}
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typedef struct {
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int deviceHandle;
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int sramHandle;
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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 pages;
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} RomMapperDram;
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static void destroy(RomMapperDram* 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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panasonicDramUnregister(rm->sramHandle);
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free(rm->romData);
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free(rm);
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}
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static void setDram(RomMapperDram* rm, int enable)
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{
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if (enable) {
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if (rm->slot == 0 && rm->sslot == 0) {
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int endPage = MIN(4, rm->startPage + rm->pages);
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int page;
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for (page = rm->startPage; page < 4; page++) {
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slotMapPage(rm->slot, rm->sslot, page, boardGetRamPage(page - 8), 1, 0);
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}
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}
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else if (rm->slot == 3 && rm->sslot == 1) {
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int endPage = MIN(4, rm->startPage + rm->pages);
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int page;
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for (page = rm->startPage; page < 4; page++) {
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slotMapPage(rm->slot, rm->sslot, page, boardGetRamPage(page - 4), 1, 0);
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}
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}
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}
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else {
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int endPage = MIN(4, rm->startPage + rm->pages);
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int page;
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for (page = rm->startPage; page < 4; page++) {
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slotMapPage(rm->slot, rm->sslot, page, rm->romData + 0x2000 * (page - rm->startPage), 1, 0);
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}
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}
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}
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int romMapperDramCreate(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, NULL, NULL };
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RomMapperDram* rm;
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int pages = size / 0x2000 + ((size & 0x1fff) ? 1 : 0);
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if (pages == 0 || (startPage + pages) > 8) {
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return 0;
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}
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rm = malloc(sizeof(RomMapperDram));
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rm->deviceHandle = deviceManagerRegister(ROM_DRAM, &callbacks, rm);
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slotRegister(slot, sslot, startPage, pages, NULL, NULL, NULL, destroy, rm);
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rm->sramHandle = panasonicDramRegister(setDram, rm);
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rm->romData = malloc(pages * 0x2000);
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memcpy(rm->romData, romData, size);
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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->pages = pages;
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setDram(rm, 0);
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return 1;
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}
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