1 /*****************************************************************************
2 ** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Memory/romMapperMuPack.c,v $
3 **
4 ** $Revision: 1.10 $
5 **
6 ** $Date: 2008-03-30 18:38:44 $
7 **
8 ** More info: http://www.bluemsx.com
9 **
10 ** Copyright (C) 2003-2006 Daniel Vik
11 **
12 ** This program is free software; you can redistribute it and/or modify
13 ** it under the terms of the GNU General Public License as published by
14 ** the Free Software Foundation; either version 2 of the License, or
15 ** (at your option) any later version.
16 **
17 ** This program is distributed in the hope that it will be useful,
18 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ** GNU General Public License for more details.
21 **
22 ** You should have received a copy of the GNU General Public License
23 ** along with this program; if not, write to the Free Software
24 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 **
26 ******************************************************************************
27 */
28 #include "romMapperMuPack.h"
29 #include "MediaDb.h"
30 #include "SlotManager.h"
31 #include "DeviceManager.h"
32 #include "SaveState.h"
33 #include "ramMapperIo.h"
34 #include "MSXMidi.h"
35 #include <stdlib.h>
36 #include <string.h>
37
38
39 typedef struct {
40 int deviceHandle;
41 UInt8* romData;
42 int slot;
43 int sslot;
44 int romSize;
45 UInt8 sslReg;
46 UInt8 subslot[4];
47
48 int handle;
49 UInt8* ramData;
50 int ramMask;
51 UInt8 ramPort[4];
52
53 } RomMapperMuPack;
54
55
writeIo(RomMapperMuPack * rm,UInt16 page,UInt8 value)56 static void writeIo(RomMapperMuPack* rm, UInt16 page, UInt8 value)
57 {
58 rm->ramPort[page] = value;
59 }
60
saveState(RomMapperMuPack * rm)61 static void saveState(RomMapperMuPack* rm)
62 {
63 SaveState* state = saveStateOpenForWrite("mapperMuPack");
64
65 saveStateSet(state, "sslReg", rm->sslReg);
66 saveStateSetBuffer(state, "subslot", rm->subslot, 4);
67
68 saveStateSetBuffer(state, "ramPort", rm->ramPort, 4);
69 saveStateSetBuffer(state, "ramData", rm->ramData, 0x4000 * (rm->ramMask + 1));
70
71 saveStateClose(state);
72 }
73
loadState(RomMapperMuPack * rm)74 static void loadState(RomMapperMuPack* rm)
75 {
76 SaveState* state = saveStateOpenForRead("mapperMuPack");
77 int i;
78
79 rm->sslReg = (UInt8)saveStateGet(state, "sslReg", 0);
80 saveStateGetBuffer(state, "subslot", rm->subslot, 4);
81
82 saveStateGetBuffer(state, "ramPort", rm->ramPort, 4);
83 saveStateGetBuffer(state, "ramData", rm->ramData, 0x4000 * (rm->ramMask + 1));
84
85 saveStateClose(state);
86
87 for (i = 0; i < 4; i++) {
88 writeIo(rm, i, rm->ramPort[i]);
89 }
90 }
91
destroy(RomMapperMuPack * rm)92 static void destroy(RomMapperMuPack* rm)
93 {
94 slotUnregister(rm->slot, rm->sslot, 0);
95 deviceManagerUnregister(rm->deviceHandle);
96
97 ramMapperIoRemove(rm->handle);
98
99 free(rm->romData);
100 free(rm->ramData);
101 free(rm);
102 }
103
reset(RomMapperMuPack * rm)104 static void reset(RomMapperMuPack* rm)
105 {
106 int page;
107 rm->sslReg = 0;
108 for (page = 0; page < 4; page++) {
109 rm->subslot[page] = 0;
110 rm->ramPort[page] = page;
111 }
112 }
113
read(RomMapperMuPack * rm,UInt16 address)114 static UInt8 read(RomMapperMuPack* rm, UInt16 address)
115 {
116 int page = address >> 14;
117 int ramBaseAddr;
118
119 if (address == 0xffff) {
120 return ~rm->sslReg;
121 }
122
123 switch (rm->subslot[page]) {
124 case 1:
125 ramBaseAddr = 0x4000 * (rm->ramPort[page] & rm->ramMask);
126 return rm->ramData[ramBaseAddr + (address & 0x3fff)];
127 case 2:
128 if (address >= 0x4000 && address < 0x4000 + rm->romSize) {
129 return rm->romData[address - 0x4000];
130 }
131 return 0xff;
132 }
133 return 0xff;
134 }
135
136
write(RomMapperMuPack * rm,UInt16 address,UInt8 value)137 static void write(RomMapperMuPack* rm, UInt16 address, UInt8 value)
138 {
139 int page = address >> 14;
140 int ramBaseAddr;
141
142 if (address == 0xffff) {
143 rm->sslReg = value;
144 for (page = 0; page < 4; page++) {
145 rm->subslot[page] = value & 3;
146 value >>= 2;
147 }
148 return;
149 }
150 switch (rm->subslot[page]) {
151 case 1:
152 ramBaseAddr = 0x4000 * (rm->ramPort[page] & rm->ramMask);
153 rm->ramData[ramBaseAddr + (address & 0x3fff)] = value;
154 }
155 }
156
romMapperMuPackCreate(const char * filename,UInt8 * romData,int size,int slot,int sslot,int startPage)157 int romMapperMuPackCreate(const char* filename, UInt8* romData,
158 int size, int slot, int sslot, int startPage)
159 {
160 DeviceCallbacks callbacks = { destroy, reset, saveState, loadState };
161 RomMapperMuPack* rm;
162 int i;
163
164 rm = malloc(sizeof(RomMapperMuPack));
165
166 rm->deviceHandle = deviceManagerRegister(ROM_MUPACK, &callbacks, rm);
167 slotRegister(slot, sslot, 0, 8, read, read, write, destroy, rm);
168
169 rm->romData = calloc(1, size);
170 memcpy(rm->romData, romData, size);
171 rm->romSize = size;
172 rm->slot = slot;
173 rm->sslot = sslot;
174
175 // Ram mapper
176 rm->ramMask = 16 - 1;
177 rm->ramData = malloc((rm->ramMask + 1) * 0x4000);
178 rm->handle = ramMapperIoAdd((rm->ramMask + 1) * 0x4000, writeIo, rm);
179
180 // MIDI
181 MSXMidiCreate(1);
182
183 for (i = 0; i < 8; i++) {
184 slotMapPage(rm->slot, rm->sslot, i, NULL, 0, 0);
185 }
186
187 reset(rm);
188
189 return 1;
190 }
191
192