Pico/cd/Area.c

   1 // Savestate handling for emulated Sega/Mega CD machine.
   2 // (c) Copyright 2007, Grazvydas "notaz" Ignotas
   3
   4
   5 #include "../PicoInt.h"
   6
   7 // ym2612
   8 #include "../sound/ym2612.h"
   9
  10 // sn76496
  11 extern int *sn76496_regs;
  12
  13 void (*PicoStateProgressCB)(const char *str) = 0;
  14
  15
  16 typedef enum {
  17         CHUNK_M68K = 1,
  18         CHUNK_RAM,
  19         CHUNK_VRAM,
  20         CHUNK_ZRAM,
  21         CHUNK_CRAM,     // 5
  22         CHUNK_VSRAM,
  23         CHUNK_MISC,
  24         CHUNK_VIDEO,
  25         CHUNK_Z80,
  26         CHUNK_PSG,      // 10
  27         CHUNK_FM,
  28         // CD stuff
  29         CHUNK_S68K,
  30         CHUNK_PRG_RAM,
  31         CHUNK_WORD_RAM,
  32         CHUNK_PCM_RAM,  // 15
  33         CHUNK_BRAM,
  34         CHUNK_GA_REGS,
  35         CHUNK_PCM,
  36         CHUNK_CDC,
  37         CHUNK_CDD,      // 20
  38         CHUNK_SCD,
  39         CHUNK_RC,
  40         CHUNK_MISC_CD,
  41 } chunk_name_e;
  42
  43
  44 static char *chunk_names[] = {
  45         "Saving.. M68K state",
  46         "Saving.. RAM",
  47         "Saving.. VRAM",
  48         "Saving.. ZRAM",
  49         "Saving.. CRAM",        // 5
  50         "Saving.. VSRAM",
  51         "Saving.. emu state",
  52         "Saving.. VIDEO",
  53         "Saving.. Z80 state",
  54         "Saving.. PSG",         // 10
  55         "Saving.. FM",
  56         // CD stuff
  57         "Saving.. S68K state",
  58         "Saving.. PRG_RAM",
  59         "Saving.. WORD_RAM",
  60         "Saving.. PCM_RAM",     // 15
  61         "Saving.. BRAM",
  62         "Saving.. GATE ARRAY regs",
  63         "Saving.. PCM state",
  64         "Saving.. CDC",
  65         "Saving.. CDD",         // 20
  66         "Saving.. SCD",
  67         "Saving.. GFX chip",
  68         "Saving.. MCD state",
  69 };
  70
  71
  72 static int write_chunk(chunk_name_e name, int len, void *data, void *file)
  73 {
  74         size_t bwritten = 0;
  75         bwritten += areaWrite(&name, 1, 1, file);
  76         bwritten += areaWrite(&len, 1, 4, file);
  77         bwritten += areaWrite(data, 1, len, file);
  78
  79         return (bwritten == len + 4 + 1);
  80 }
  81
  82
  83 #define CHECKED_WRITE(name,len,data) \
  84         if (PicoStateProgressCB) PicoStateProgressCB(chunk_names[name]); \
  85         if (!write_chunk(name, len, data, file)) return 1;
  86
  87 #define CHECKED_WRITE_BUFF(name,buff) \
  88         if (PicoStateProgressCB) PicoStateProgressCB(chunk_names[name]); \
  89         if (!write_chunk(name, sizeof(buff), &buff, file)) return 1;
  90
  91 PICO_INTERNAL int PicoCdSaveState(void *file)
  92 {
  93         unsigned char buff[0x60];
  94         void *ym2612_regs = YM2612GetRegs();
  95
  96         areaWrite("PicoSMCD", 1, 8, file);
  97         areaWrite(&PicoVer, 1, 4, file);
  98
  99         memset(buff, 0, sizeof(buff));
 100         PicoAreaPackCpu(buff, 0);
 101         CHECKED_WRITE_BUFF(CHUNK_M68K,  buff);
 102         CHECKED_WRITE_BUFF(CHUNK_RAM,   Pico.ram);
 103         CHECKED_WRITE_BUFF(CHUNK_VRAM,  Pico.vram);
 104         CHECKED_WRITE_BUFF(CHUNK_ZRAM,  Pico.zram);
 105         CHECKED_WRITE_BUFF(CHUNK_CRAM,  Pico.cram);
 106         CHECKED_WRITE_BUFF(CHUNK_VSRAM, Pico.vsram);
 107         CHECKED_WRITE_BUFF(CHUNK_MISC,  Pico.m);
 108         CHECKED_WRITE_BUFF(CHUNK_VIDEO, Pico.video);
 109         if(PicoOpt&7) {
 110                 memset(buff, 0, sizeof(buff));
 111                 z80_pack(buff);
 112                 CHECKED_WRITE_BUFF(CHUNK_Z80, buff);
 113         }
 114         if(PicoOpt&3)
 115                 CHECKED_WRITE(CHUNK_PSG, 28*4, sn76496_regs);
 116         if(PicoOpt&1)
 117                 CHECKED_WRITE(CHUNK_FM, 0x200+4, ym2612_regs);
 118
 119         if (PicoMCD & 1)
 120         {
 121                 Pico_mcd->m.audio_offset = mp3_get_offset();
 122                 memset(buff, 0, sizeof(buff));
 123                 PicoAreaPackCpu(buff, 1);
 124                 if (Pico_mcd->s68k_regs[3]&4) // 1M mode?
 125                         wram_1M_to_2M(Pico_mcd->word_ram2M);
 126                 Pico_mcd->m.hint_vector = *(unsigned short *)(Pico_mcd->bios + 0x72);
 127
 128                 CHECKED_WRITE_BUFF(CHUNK_S68K,     buff);
 129                 CHECKED_WRITE_BUFF(CHUNK_PRG_RAM,  Pico_mcd->prg_ram);
 130                 CHECKED_WRITE_BUFF(CHUNK_WORD_RAM, Pico_mcd->word_ram2M); // in 2M format
 131                 CHECKED_WRITE_BUFF(CHUNK_PCM_RAM,  Pico_mcd->pcm_ram);
 132                 CHECKED_WRITE_BUFF(CHUNK_BRAM,     Pico_mcd->bram);
 133                 CHECKED_WRITE_BUFF(CHUNK_GA_REGS,  Pico_mcd->s68k_regs); // GA regs, not CPU regs
 134                 CHECKED_WRITE_BUFF(CHUNK_PCM,      Pico_mcd->pcm);
 135                 CHECKED_WRITE_BUFF(CHUNK_CDD,      Pico_mcd->cdd);
 136                 CHECKED_WRITE_BUFF(CHUNK_CDC,      Pico_mcd->cdc);
 137                 CHECKED_WRITE_BUFF(CHUNK_SCD,      Pico_mcd->scd);
 138                 CHECKED_WRITE_BUFF(CHUNK_RC,       Pico_mcd->rot_comp);
 139                 CHECKED_WRITE_BUFF(CHUNK_MISC_CD,  Pico_mcd->m);
 140
 141                 if (Pico_mcd->s68k_regs[3]&4) // convert back
 142                         wram_2M_to_1M(Pico_mcd->word_ram2M);
 143         }
 144
 145         return 0;
 146 }
 147
 148 static int g_read_offs = 0;
 149
 150 #define R_ERROR_RETURN(error) \
 151 { \
 152         printf("PicoCdLoadState @ %x: " error "\n", g_read_offs); \
 153         return 1; \
 154 }
 155
 156 // when is eof really set?
 157 #define CHECKED_READ(len,data) \
 158         if (areaRead(data, 1, len, file) != len) { \
 159                 if (len == 1 && areaEof(file)) return 0; \
 160                 R_ERROR_RETURN("areaRead: premature EOF\n"); \
 161                 return 1; \
 162         } \
 163         g_read_offs += len;
 164
 165 #define CHECKED_READ2(len2,data) \
 166         if (len2 != len) R_ERROR_RETURN("unexpected len, wanted " #len2); \
 167         CHECKED_READ(len2, data)
 168
 169 #define CHECKED_READ_BUFF(buff) CHECKED_READ2(sizeof(buff), &buff);
 170
 171 PICO_INTERNAL int PicoCdLoadState(void *file)
 172 {
 173         unsigned char buff[0x60];
 174         int ver, len;
 175         void *ym2612_regs = YM2612GetRegs();
 176
 177         g_read_offs = 0;
 178         CHECKED_READ(8, buff);
 179         if (strncmp((char *)buff, "PicoSMCD", 8)) R_ERROR_RETURN("bad header");
 180         CHECKED_READ(4, &ver);
 181
 182         while (!areaEof(file))
 183         {
 184                 CHECKED_READ(1, buff);
 185                 CHECKED_READ(4, &len);
 186                 if (len < 0 || len > 1024*512) R_ERROR_RETURN("bad length");
 187                 if (buff[0] > CHUNK_FM && !(PicoMCD & 1)) R_ERROR_RETURN("cd chunk in non CD state?");
 188
 189                 switch (buff[0])
 190                 {
 191                         case CHUNK_M68K:
 192                                 CHECKED_READ_BUFF(buff);
 193                                 PicoAreaUnpackCpu(buff, 0);
 194                                 break;
 195
 196                         case CHUNK_Z80:
 197                                 CHECKED_READ_BUFF(buff);
 198                                 z80_unpack(buff);
 199                                 break;
 200
 201                         case CHUNK_RAM:   CHECKED_READ_BUFF(Pico.ram); break;
 202                         case CHUNK_VRAM:  CHECKED_READ_BUFF(Pico.vram); break;
 203                         case CHUNK_ZRAM:  CHECKED_READ_BUFF(Pico.zram); break;
 204                         case CHUNK_CRAM:  CHECKED_READ_BUFF(Pico.cram); break;
 205                         case CHUNK_VSRAM: CHECKED_READ_BUFF(Pico.vsram); break;
 206                         case CHUNK_MISC:  CHECKED_READ_BUFF(Pico.m); break;
 207                         case CHUNK_VIDEO: CHECKED_READ_BUFF(Pico.video); break;
 208                         case CHUNK_PSG:   CHECKED_READ2(28*4, sn76496_regs); break;
 209                         case CHUNK_FM:
 210                                 CHECKED_READ2(0x200+4, ym2612_regs);
 211                                 YM2612PicoStateLoad();
 212                                 break;
 213
 214                         // cd stuff
 215                         case CHUNK_S68K:
 216                                 CHECKED_READ_BUFF(buff);
 217                                 PicoAreaUnpackCpu(buff, 1);
 218                                 break;
 219
 220                         case CHUNK_PRG_RAM:     CHECKED_READ_BUFF(Pico_mcd->prg_ram); break;
 221                         case CHUNK_WORD_RAM:    CHECKED_READ_BUFF(Pico_mcd->word_ram2M); break;
 222                         case CHUNK_PCM_RAM:     CHECKED_READ_BUFF(Pico_mcd->pcm_ram); break;
 223                         case CHUNK_BRAM:        CHECKED_READ_BUFF(Pico_mcd->bram); break;
 224                         case CHUNK_GA_REGS:     CHECKED_READ_BUFF(Pico_mcd->s68k_regs); break;
 225                         case CHUNK_PCM:         CHECKED_READ_BUFF(Pico_mcd->pcm); break;
 226                         case CHUNK_CDD:         CHECKED_READ_BUFF(Pico_mcd->cdd); break;
 227                         case CHUNK_CDC:         CHECKED_READ_BUFF(Pico_mcd->cdc); break;
 228                         case CHUNK_SCD:         CHECKED_READ_BUFF(Pico_mcd->scd); break;
 229                         case CHUNK_RC:          CHECKED_READ_BUFF(Pico_mcd->rot_comp); break;
 230                         case CHUNK_MISC_CD:     CHECKED_READ_BUFF(Pico_mcd->m); break;
 231
 232                         default:
 233                                 printf("PicoCdLoadState: skipping unknown chunk %i of size %i\n", buff[0], len);
 234                                 areaSeek(file, len, SEEK_CUR);
 235                                 break;
 236                 }
 237         }
 238
 239         /* after load events */
 240         if (Pico_mcd->s68k_regs[3]&4) // 1M mode?
 241                 wram_2M_to_1M(Pico_mcd->word_ram2M);
 242 #ifdef _ASM_CD_MEMORY_C
 243         PicoMemResetCD(Pico_mcd->s68k_regs[3]);
 244         if (Pico_mcd->s68k_regs[3]&4)
 245                 PicoMemResetCDdecode(Pico_mcd->s68k_regs[3]);
 246 #endif
 247         if (Pico_mcd->m.audio_track > 0 && Pico_mcd->m.audio_track < Pico_mcd->TOC.Last_Track)
 248                 mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);
 249         // restore hint vector
 250         *(unsigned short *)(Pico_mcd->bios + 0x72) = Pico_mcd->m.hint_vector;
 251
 252         return 0;
 253 }
 254
 255
 256 int PicoCdLoadStateGfx(void *file)
 257 {
 258         int ver, len, found = 0;
 259         char buff[8];
 260
 261         g_read_offs = 0;
 262         CHECKED_READ(8, buff);
 263         if (strncmp(buff, "PicoSMCD", 8)) R_ERROR_RETURN("bad header");
 264         CHECKED_READ(4, &ver);
 265
 266         while (!areaEof(file) && found < 4)
 267         {
 268                 CHECKED_READ(1, buff);
 269                 CHECKED_READ(4, &len);
 270                 if (len < 0 || len > 1024*512) R_ERROR_RETURN("bad length");
 271                 if (buff[0] > CHUNK_FM && !(PicoMCD & 1)) R_ERROR_RETURN("cd chunk in non CD state?");
 272
 273                 switch (buff[0])
 274                 {
 275                         case CHUNK_VRAM:  CHECKED_READ_BUFF(Pico.vram);  found++; break;
 276                         case CHUNK_CRAM:  CHECKED_READ_BUFF(Pico.cram);  found++; break;
 277                         case CHUNK_VSRAM: CHECKED_READ_BUFF(Pico.vsram); found++; break;
 278                         case CHUNK_VIDEO: CHECKED_READ_BUFF(Pico.video); found++; break;
 279                         default:
 280                                 areaSeek(file, len, SEEK_CUR);
 281                                 break;
 282                 }
 283         }
 284
 285         return 0;
 286 }
 287
 288