pico/cd/area.c

   1 // Savestate handling for emulated Sega/Mega CD machine.
   2 // (c) Copyright 2007, Grazvydas "notaz" Ignotas
   3
   4
   5 #include "../pico_int.h"
   6
   7 // ym2612
   8 #include "../sound/ym2612.h"
   9
  10 // sn76496
  11 extern int *sn76496_regs;
  12
  13 carthw_state_chunk *carthw_chunks;
  14 void (*PicoStateProgressCB)(const char *str) = 0;
  15
  16
  17 typedef enum {
  18         CHUNK_M68K = 1,
  19         CHUNK_RAM,
  20         CHUNK_VRAM,
  21         CHUNK_ZRAM,
  22         CHUNK_CRAM,     // 5
  23         CHUNK_VSRAM,
  24         CHUNK_MISC,
  25         CHUNK_VIDEO,
  26         CHUNK_Z80,
  27         CHUNK_PSG,      // 10
  28         CHUNK_FM,
  29         // CD stuff
  30         CHUNK_S68K,
  31         CHUNK_PRG_RAM,
  32         CHUNK_WORD_RAM,
  33         CHUNK_PCM_RAM,  // 15
  34         CHUNK_BRAM,
  35         CHUNK_GA_REGS,
  36         CHUNK_PCM,
  37         CHUNK_CDC,
  38         CHUNK_CDD,      // 20
  39         CHUNK_SCD,
  40         CHUNK_RC,
  41         CHUNK_MISC_CD,
  42         CHUNK_DEFAULT_COUNT
  43         // CHUNK_CARTHW = 64,   // defined in PicoInt
  44 } chunk_name_e;
  45
  46
  47 static char *chunk_names[] = {
  48         "INVALID!",
  49         "Saving.. M68K state",
  50         "Saving.. RAM",
  51         "Saving.. VRAM",
  52         "Saving.. ZRAM",
  53         "Saving.. CRAM",        // 5
  54         "Saving.. VSRAM",
  55         "Saving.. emu state",
  56         "Saving.. VIDEO",
  57         "Saving.. Z80 state",
  58         "Saving.. PSG",         // 10
  59         "Saving.. FM",
  60         // CD stuff
  61         "Saving.. S68K state",
  62         "Saving.. PRG_RAM",
  63         "Saving.. WORD_RAM",
  64         "Saving.. PCM_RAM",     // 15
  65         "Saving.. BRAM",
  66         "Saving.. GATE ARRAY regs",
  67         "Saving.. PCM state",
  68         "Saving.. CDC",
  69         "Saving.. CDD",         // 20
  70         "Saving.. SCD",
  71         "Saving.. GFX chip",
  72         "Saving.. MCD state",
  73 };
  74
  75
  76 static int write_chunk(chunk_name_e name, int len, void *data, void *file)
  77 {
  78         size_t bwritten = 0;
  79         bwritten += areaWrite(&name, 1, 1, file);
  80         bwritten += areaWrite(&len, 1, 4, file);
  81         bwritten += areaWrite(data, 1, len, file);
  82
  83         return (bwritten == len + 4 + 1);
  84 }
  85
  86
  87 #define CHECKED_WRITE(name,len,data) { \
  88         if (PicoStateProgressCB && name < CHUNK_DEFAULT_COUNT) \
  89                 PicoStateProgressCB(chunk_names[name]); \
  90         if (!write_chunk(name, len, data, file)) return 1; \
  91 }
  92
  93 #define CHECKED_WRITE_BUFF(name,buff) { \
  94         if (PicoStateProgressCB && name < CHUNK_DEFAULT_COUNT) \
  95                 PicoStateProgressCB(chunk_names[name]); \
  96         if (!write_chunk(name, sizeof(buff), &buff, file)) return 1; \
  97 }
  98
  99 PICO_INTERNAL int PicoCdSaveState(void *file)
 100 {
 101         unsigned char buff[0x60];
 102         void *ym2612_regs = YM2612GetRegs();
 103         int ver = 0x0133; // not really used..
 104
 105         areaWrite("PicoSEXT", 1, 8, file);
 106         areaWrite(&ver, 1, 4, file);
 107
 108         memset(buff, 0, sizeof(buff));
 109         PicoAreaPackCpu(buff, 0);
 110         CHECKED_WRITE_BUFF(CHUNK_M68K,  buff);
 111         CHECKED_WRITE_BUFF(CHUNK_RAM,   Pico.ram);
 112         CHECKED_WRITE_BUFF(CHUNK_VRAM,  Pico.vram);
 113         CHECKED_WRITE_BUFF(CHUNK_ZRAM,  Pico.zram);
 114         CHECKED_WRITE_BUFF(CHUNK_CRAM,  Pico.cram);
 115         CHECKED_WRITE_BUFF(CHUNK_VSRAM, Pico.vsram);
 116         CHECKED_WRITE_BUFF(CHUNK_MISC,  Pico.m);
 117         CHECKED_WRITE_BUFF(CHUNK_VIDEO, Pico.video);
 118
 119         memset(buff, 0, sizeof(buff));
 120         z80_pack(buff);
 121         CHECKED_WRITE_BUFF(CHUNK_Z80, buff);
 122         CHECKED_WRITE(CHUNK_PSG, 28*4, sn76496_regs);
 123         ym2612_pack_state();
 124         CHECKED_WRITE(CHUNK_FM, 0x200+4, ym2612_regs);
 125
 126         if (PicoAHW & PAHW_MCD)
 127         {
 128                 memset(buff, 0, sizeof(buff));
 129                 PicoAreaPackCpu(buff, 1);
 130                 if (Pico_mcd->s68k_regs[3]&4) // 1M mode?
 131                         wram_1M_to_2M(Pico_mcd->word_ram2M);
 132                 Pico_mcd->m.hint_vector = *(unsigned short *)(Pico_mcd->bios + 0x72);
 133
 134                 CHECKED_WRITE_BUFF(CHUNK_S68K,     buff);
 135                 CHECKED_WRITE_BUFF(CHUNK_PRG_RAM,  Pico_mcd->prg_ram);
 136                 CHECKED_WRITE_BUFF(CHUNK_WORD_RAM, Pico_mcd->word_ram2M); // in 2M format
 137                 CHECKED_WRITE_BUFF(CHUNK_PCM_RAM,  Pico_mcd->pcm_ram);
 138                 CHECKED_WRITE_BUFF(CHUNK_BRAM,     Pico_mcd->bram);
 139                 CHECKED_WRITE_BUFF(CHUNK_GA_REGS,  Pico_mcd->s68k_regs); // GA regs, not CPU regs
 140                 CHECKED_WRITE_BUFF(CHUNK_PCM,      Pico_mcd->pcm);
 141                 CHECKED_WRITE_BUFF(CHUNK_CDD,      Pico_mcd->cdd);
 142                 CHECKED_WRITE_BUFF(CHUNK_CDC,      Pico_mcd->cdc);
 143                 CHECKED_WRITE_BUFF(CHUNK_SCD,      Pico_mcd->scd);
 144                 CHECKED_WRITE_BUFF(CHUNK_RC,       Pico_mcd->rot_comp);
 145                 CHECKED_WRITE_BUFF(CHUNK_MISC_CD,  Pico_mcd->m);
 146
 147                 if (Pico_mcd->s68k_regs[3]&4) // convert back
 148                         wram_2M_to_1M(Pico_mcd->word_ram2M);
 149         }
 150
 151         if (carthw_chunks != NULL)
 152         {
 153                 carthw_state_chunk *chwc;
 154                 if (PicoStateProgressCB)
 155                         PicoStateProgressCB("Saving.. cart hw state");
 156                 for (chwc = carthw_chunks; chwc->ptr != NULL; chwc++)
 157                         CHECKED_WRITE(chwc->chunk, chwc->size, chwc->ptr);
 158         }
 159
 160         return 0;
 161 }
 162
 163 static int g_read_offs = 0;
 164
 165 #define R_ERROR_RETURN(error) \
 166 { \
 167         elprintf(EL_STATUS, "PicoCdLoadState @ %x: " error, g_read_offs); \
 168         return 1; \
 169 }
 170
 171 // when is eof really set?
 172 #define CHECKED_READ(len,data) \
 173         if (areaRead(data, 1, len, file) != len) { \
 174                 if (len == 1 && areaEof(file)) goto readend; \
 175                 R_ERROR_RETURN("areaRead: premature EOF\n"); \
 176                 return 1; \
 177         } \
 178         g_read_offs += len;
 179
 180 #define CHECKED_READ2(len2,data) \
 181         if (len2 != len) { \
 182                 elprintf(EL_STATUS, "unexpected len %i, wanted %i (%s)", len, len2, #len2); \
 183                 if (len > len2) R_ERROR_RETURN("failed."); \
 184                 /* else read anyway and hope for the best.. */ \
 185         } \
 186         CHECKED_READ(len, data)
 187
 188 #define CHECKED_READ_BUFF(buff) CHECKED_READ2(sizeof(buff), &buff);
 189
 190 PICO_INTERNAL int PicoCdLoadState(void *file)
 191 {
 192         unsigned char buff[0x60], buff_m68k[0x60], buff_s68k[0x60];
 193         int ver, len;
 194         void *ym2612_regs = YM2612GetRegs();
 195
 196         g_read_offs = 0;
 197         CHECKED_READ(8, buff);
 198         if (strncmp((char *)buff, "PicoSMCD", 8) && strncmp((char *)buff, "PicoSEXT", 8))
 199                 R_ERROR_RETURN("bad header");
 200         CHECKED_READ(4, &ver);
 201
 202         while (!areaEof(file))
 203         {
 204                 CHECKED_READ(1, buff);
 205                 CHECKED_READ(4, &len);
 206                 if (len < 0 || len > 1024*512) R_ERROR_RETURN("bad length");
 207                 if (buff[0] > CHUNK_FM && buff[0] <= CHUNK_MISC_CD && !(PicoAHW & PAHW_MCD))
 208                         R_ERROR_RETURN("cd chunk in non CD state?");
 209
 210                 switch (buff[0])
 211                 {
 212                         case CHUNK_M68K:
 213                                 CHECKED_READ_BUFF(buff_m68k);
 214                                 break;
 215
 216                         case CHUNK_Z80:
 217                                 CHECKED_READ_BUFF(buff);
 218                                 z80_unpack(buff);
 219                                 break;
 220
 221                         case CHUNK_RAM:   CHECKED_READ_BUFF(Pico.ram); break;
 222                         case CHUNK_VRAM:  CHECKED_READ_BUFF(Pico.vram); break;
 223                         case CHUNK_ZRAM:  CHECKED_READ_BUFF(Pico.zram); break;
 224                         case CHUNK_CRAM:  CHECKED_READ_BUFF(Pico.cram); break;
 225                         case CHUNK_VSRAM: CHECKED_READ_BUFF(Pico.vsram); break;
 226                         case CHUNK_MISC:  CHECKED_READ_BUFF(Pico.m); break;
 227                         case CHUNK_VIDEO: CHECKED_READ_BUFF(Pico.video); break;
 228                         case CHUNK_PSG:   CHECKED_READ2(28*4, sn76496_regs); break;
 229                         case CHUNK_FM:
 230                                 CHECKED_READ2(0x200+4, ym2612_regs);
 231                                 ym2612_unpack_state();
 232                                 break;
 233
 234                         // cd stuff
 235                         case CHUNK_S68K:
 236                                 CHECKED_READ_BUFF(buff_s68k);
 237                                 break;
 238
 239                         case CHUNK_PRG_RAM:     CHECKED_READ_BUFF(Pico_mcd->prg_ram); break;
 240                         case CHUNK_WORD_RAM:    CHECKED_READ_BUFF(Pico_mcd->word_ram2M); break;
 241                         case CHUNK_PCM_RAM:     CHECKED_READ_BUFF(Pico_mcd->pcm_ram); break;
 242                         case CHUNK_BRAM:        CHECKED_READ_BUFF(Pico_mcd->bram); break;
 243                         case CHUNK_GA_REGS:     CHECKED_READ_BUFF(Pico_mcd->s68k_regs); break;
 244                         case CHUNK_PCM:         CHECKED_READ_BUFF(Pico_mcd->pcm); break;
 245                         case CHUNK_CDD:         CHECKED_READ_BUFF(Pico_mcd->cdd); break;
 246                         case CHUNK_CDC:         CHECKED_READ_BUFF(Pico_mcd->cdc); break;
 247                         case CHUNK_SCD:         CHECKED_READ_BUFF(Pico_mcd->scd); break;
 248                         case CHUNK_RC:          CHECKED_READ_BUFF(Pico_mcd->rot_comp); break;
 249                         case CHUNK_MISC_CD:     CHECKED_READ_BUFF(Pico_mcd->m); break;
 250
 251                         default:
 252                                 if (carthw_chunks != NULL)
 253                                 {
 254                                         carthw_state_chunk *chwc;
 255                                         for (chwc = carthw_chunks; chwc->ptr != NULL; chwc++) {
 256                                                 if (chwc->chunk == buff[0]) {
 257                                                         CHECKED_READ2(chwc->size, chwc->ptr);
 258                                                         goto breakswitch;
 259                                                 }
 260                                         }
 261                                 }
 262                                 elprintf(EL_STATUS, "PicoCdLoadState: skipping unknown chunk %i of size %i", buff[0], len);
 263                                 areaSeek(file, len, SEEK_CUR);
 264                                 break;
 265                 }
 266                 breakswitch:;
 267         }
 268
 269 readend:
 270         if (PicoAHW & PAHW_MCD)
 271         {
 272                 PicoMemStateLoaded();
 273
 274                 if (!(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
 275                         cdda_start_play();
 276
 277                 // must unpack after other CD stuff is loaded
 278                 PicoAreaUnpackCpu(buff_s68k, 1);
 279         }
 280         PicoAreaUnpackCpu(buff_m68k, 0);
 281
 282         return 0;
 283 }
 284
 285
 286 int PicoCdLoadStateGfx(void *file)
 287 {
 288         int ver, len, found = 0;
 289         char buff[8];
 290
 291         g_read_offs = 0;
 292         CHECKED_READ(8, buff);
 293         if (strncmp((char *)buff, "PicoSMCD", 8) && strncmp((char *)buff, "PicoSEXT", 8))
 294                 R_ERROR_RETURN("bad header");
 295         CHECKED_READ(4, &ver);
 296
 297         while (!areaEof(file) && found < 4)
 298         {
 299                 CHECKED_READ(1, buff);
 300                 CHECKED_READ(4, &len);
 301                 if (len < 0 || len > 1024*512) R_ERROR_RETURN("bad length");
 302                 if (buff[0] > CHUNK_FM && buff[0] <= CHUNK_MISC_CD && !(PicoAHW & PAHW_MCD))
 303                         R_ERROR_RETURN("cd chunk in non CD state?");
 304
 305                 switch (buff[0])
 306                 {
 307                         case CHUNK_VRAM:  CHECKED_READ_BUFF(Pico.vram);  found++; break;
 308                         case CHUNK_CRAM:  CHECKED_READ_BUFF(Pico.cram);  found++; break;
 309                         case CHUNK_VSRAM: CHECKED_READ_BUFF(Pico.vsram); found++; break;
 310                         case CHUNK_VIDEO: CHECKED_READ_BUFF(Pico.video); found++; break;
 311                         default:
 312                                 areaSeek(file, len, SEEK_CUR);
 313                                 break;
 314                 }
 315         }
 316
 317 readend:
 318         return 0;
 319 }
 320
 321