Akop Karapetyan
273 lines
7.7 KiB
C
273 lines
7.7 KiB
C
/*****************************************************************************
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** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Memory/romMapperOpcodeModule.c,v $
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**
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** $Revision: 1.1 $
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**
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** $Date: 2008-11-23 20:26:12 $
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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 "romMapperOpcodeModule.h"
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#include "MediaDb.h"
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#include "DeviceManager.h"
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#include "DebugDeviceManager.h"
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#include "SlotManager.h"
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#include "SaveState.h"
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#include "AY8910.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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UInt8 slotSelect;
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UInt8 biosLatch;
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UInt8 megaRamLatch[4];
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AY8910* ay8910;
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int slot;
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int sslot;
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int startPage;
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int deviceHandle;
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int debugHandle;
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UInt8 biosRom[0x20000];
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UInt8 ram[0x6000];
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UInt8 rom[0x20000];
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UInt8 megaRam[0x20000];
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UInt8 saveRam[0x8000];
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} RomMapperOpcodeModule;
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#define SLOT_CARTRIDGE 0
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#define SLOT_MEGARAM 1
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#define SLOT_SAVERAM 2
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#define SLOT_EMPTY 3
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static void slotUpdate(RomMapperOpcodeModule* rm)
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{
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UInt8 slotSelect = rm->slotSelect;
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int i;
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slotMapPage(rm->slot, rm->sslot, 0, rm->biosRom + rm->biosLatch * 0x2000, 1, 0);
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slotMapPage(rm->slot, rm->sslot, 1, rm->ram + 0x0000, 1, 1);
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slotMapPage(rm->slot, rm->sslot, 2, rm->ram + 0x2000, 1, 1);
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slotMapPage(rm->slot, rm->sslot, 3, rm->ram + 0x4000, 1, 1);
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for (i = 0; i < 4; i++, slotSelect >>= 2) {
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switch (slotSelect & 3) {
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case SLOT_CARTRIDGE:
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slotMapPage(rm->slot, rm->sslot, 4 + i, rm->rom + 0x2000 * i, 1, 0);
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break;
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case SLOT_MEGARAM:
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slotMapPage(rm->slot, rm->sslot, 4 + i, rm->megaRam + 0x2000 * rm->megaRamLatch[i], 1, 1);
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break;
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case SLOT_SAVERAM:
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slotMapPage(rm->slot, rm->sslot, 4 + i, rm->saveRam + 0x2000 * i, 1, 0);
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break;
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case SLOT_EMPTY:
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slotMapPage(rm->slot, rm->sslot, 4 + i, NULL, 0, 0);
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break;
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}
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}
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}
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static void saveState(RomMapperOpcodeModule* rm)
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{
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SaveState* state = saveStateOpenForWrite("mapperOpcodeModule");
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saveStateSet(state, "biosLatch", rm->biosLatch);
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saveStateSet(state, "slotSelect", rm->slotSelect);
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saveStateSet(state, "megaRamLatch0", rm->megaRamLatch[0]);
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saveStateSet(state, "megaRamLatch1", rm->megaRamLatch[1]);
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saveStateSet(state, "megaRamLatch2", rm->megaRamLatch[2]);
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saveStateSet(state, "megaRamLatch3", rm->megaRamLatch[3]);
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saveStateSetBuffer(state, "ram", rm->ram, 0x6000);
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saveStateClose(state);
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ay8910SaveState(rm->ay8910);
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}
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static void loadState(RomMapperOpcodeModule* rm)
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{
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SaveState* state = saveStateOpenForRead("mapperOpcodeModule");
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rm->biosLatch = (UInt8)saveStateGet(state, "biosLatch", 0);
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rm->slotSelect = (UInt8)saveStateGet(state, "slotSelect", 0);
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rm->megaRamLatch[0] = (UInt8)saveStateGet(state, "megaRamLatch0", 0);
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rm->megaRamLatch[1] = (UInt8)saveStateGet(state, "megaRamLatch1", 0);
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rm->megaRamLatch[2] = (UInt8)saveStateGet(state, "megaRamLatch2", 0);
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rm->megaRamLatch[3] = (UInt8)saveStateGet(state, "megaRamLatch3", 0);
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saveStateGetBuffer(state, "ram", rm->ram, 0x6000);
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saveStateClose(state);
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ay8910LoadState(rm->ay8910);
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slotUpdate(rm);
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}
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static void destroy(RomMapperOpcodeModule* rm)
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{
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int i;
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deviceManagerUnregister(rm->deviceHandle);
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debugDeviceUnregister(rm->debugHandle);
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ay8910Destroy(rm->ay8910);
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for (i = 0; i < 16; i++) {
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ioPortUnregister(0x60 + i);
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}
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free(rm);
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}
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static UInt8 peek(RomMapperOpcodeModule* rm, UInt16 ioPort)
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{
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switch (ioPort) {
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case 0x40:
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return rm->biosLatch;
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case 0x52:
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return ay8910PeekData(rm->ay8910, ioPort);
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}
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return 0xff;
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}
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static UInt8 read(RomMapperOpcodeModule* rm, UInt16 ioPort)
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{
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switch (ioPort) {
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case 0x40:
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return rm->biosLatch;
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case 0x52:
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return ay8910ReadData(rm->ay8910, ioPort);
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}
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return 0xff;
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}
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static void write(RomMapperOpcodeModule* rm, UInt16 ioPort, UInt8 value)
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{
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switch (ioPort) {
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case 0x40:
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rm->biosLatch = value & 0x03;
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slotMapPage(rm->slot, rm->sslot, 0, rm->biosRom + rm->biosLatch * 0x2000, 1, 0);
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break;
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case 0x48:
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case 0x49:
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case 0x4a:
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case 0x4b:
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rm->megaRamLatch[ioPort & 3] = value & 0x0f;
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slotUpdate(rm);
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break;
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case 0x50:
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ay8910WriteAddress(rm->ay8910, ioPort, value);
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break;
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case 0x51:
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ay8910WriteData(rm->ay8910, ioPort, value);
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break;
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}
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}
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static void reset(RomMapperOpcodeModule* rm)
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{
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rm->slotSelect = 0;
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rm->megaRamLatch[0] = 0;
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rm->megaRamLatch[1] = 0;
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rm->megaRamLatch[2] = 0;
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rm->megaRamLatch[3] = 0;
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rm->biosLatch = 0;
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slotUpdate(0);
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ay8910Reset(rm->ay8910);
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}
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static void getDebugInfo(RomMapperOpcodeModule* rm, DbgDevice* dbgDevice)
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{
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DbgIoPorts* ioPorts;
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ioPorts = dbgDeviceAddIoPorts(dbgDevice, "AY8910", 3);
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dbgIoPortsAddPort(ioPorts, 0, 0x50, DBG_IO_WRITE, 0xff);
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dbgIoPortsAddPort(ioPorts, 1, 0x51, DBG_IO_WRITE, 0xff);
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dbgIoPortsAddPort(ioPorts, 2, 0x52, DBG_IO_READ, peek(rm, 0x52));
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ioPorts = dbgDeviceAddIoPorts(dbgDevice, "BIOS", 1);
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dbgIoPortsAddPort(ioPorts, 0, 0x40, DBG_IO_READWRITE, peek(rm, 0x40));
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}
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int romMapperOpcodeModuleCreate(char* filename, UInt8* romData,
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int size, int slot, int sslot,
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int startPage,
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void* biosRom, int biosSize)
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{
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DeviceCallbacks callbacks = { destroy, reset, saveState, loadState };
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DebugCallbacks dbgCallbacks = { getDebugInfo, NULL, NULL, NULL };
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RomMapperOpcodeModule* rm = malloc(sizeof(RomMapperOpcodeModule));
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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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memset(rm->ram, 0xff, sizeof(rm->ram));
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memset(rm->biosRom, 0xff, sizeof(rm->biosRom));
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memset(rm->rom, 0xff, sizeof(rm->rom));
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memset(rm->megaRam, 0xff, sizeof(rm->megaRam));
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memset(rm->saveRam, 0xff, sizeof(rm->saveRam));
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if (biosRom != NULL) {
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if (biosSize > sizeof(rm->biosRom)) {
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biosSize = sizeof(rm->biosRom);
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}
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memcpy(rm->biosRom, biosRom, biosSize);
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}
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if (romData != NULL) {
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if (size > sizeof(rm->rom)) {
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size = sizeof(rm->rom);
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}
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memcpy(rm->rom, romData, size);
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}
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rm->deviceHandle = deviceManagerRegister(ROM_OPCODEPSG, &callbacks, rm);
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rm->debugHandle = debugDeviceRegister(DBGTYPE_AUDIO, "AY8910", &dbgCallbacks, rm);
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rm->ay8910 = ay8910Create(boardGetMixer(), AY8910_MSX, PSGTYPE_AY8910, 0, NULL);
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ioPortRegister(0x40, read, write, rm);
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ioPortRegister(0x50, NULL, write, rm);
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ioPortRegister(0x51, NULL, write, rm);
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ioPortRegister(0x52, read, NULL, rm);
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reset(rm);
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return 1;
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}
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