| 1 | /*\r |
| 2 | * PicoDrive\r |
| 3 | * (c) Copyright Dave, 2004\r |
| 4 | * (C) notaz, 2006-2010\r |
| 5 | * (C) irixxxx, 2020-2024\r |
| 6 | *\r |
| 7 | * This work is licensed under the terms of MAME license.\r |
| 8 | * See COPYING file in the top-level directory.\r |
| 9 | */\r |
| 10 | \r |
| 11 | #include "pico_int.h"\r |
| 12 | #include "sound/ym2612.h"\r |
| 13 | \r |
| 14 | struct Pico Pico;\r |
| 15 | struct PicoMem PicoMem;\r |
| 16 | PicoInterface PicoIn;\r |
| 17 | \r |
| 18 | void (*PicoResetHook)(void) = NULL;\r |
| 19 | void (*PicoLineHook)(void) = NULL;\r |
| 20 | \r |
| 21 | // to be called once on emu init\r |
| 22 | void PicoInit(void)\r |
| 23 | {\r |
| 24 | // Blank space for state:\r |
| 25 | memset(&Pico,0,sizeof(Pico));\r |
| 26 | memset(&PicoMem,0,sizeof(PicoMem));\r |
| 27 | memset(&PicoIn.pad,0,sizeof(PicoIn.pad));\r |
| 28 | memset(&PicoIn.padInt,0,sizeof(PicoIn.padInt));\r |
| 29 | \r |
| 30 | Pico.est.Pico = &Pico;\r |
| 31 | Pico.est.PicoMem_vram = PicoMem.vram;\r |
| 32 | Pico.est.PicoMem_cram = PicoMem.cram;\r |
| 33 | Pico.est.PicoOpt = &PicoIn.opt;\r |
| 34 | \r |
| 35 | // Init CPUs:\r |
| 36 | SekInit();\r |
| 37 | z80_init(); // init even if we aren't going to use it\r |
| 38 | \r |
| 39 | PicoInitMCD();\r |
| 40 | PicoSVPInit();\r |
| 41 | Pico32xInit();\r |
| 42 | PsndInit();\r |
| 43 | \r |
| 44 | PicoVideoInit();\r |
| 45 | PicoDrawInit();\r |
| 46 | PicoDraw2Init();\r |
| 47 | }\r |
| 48 | \r |
| 49 | // to be called once on emu exit\r |
| 50 | void PicoExit(void)\r |
| 51 | {\r |
| 52 | if (PicoIn.AHW & PAHW_MCD)\r |
| 53 | PicoExitMCD();\r |
| 54 | PicoCartUnload();\r |
| 55 | z80_exit();\r |
| 56 | PsndExit();\r |
| 57 | \r |
| 58 | free(Pico.sv.data);\r |
| 59 | Pico.sv.data = NULL;\r |
| 60 | Pico.sv.start = Pico.sv.end = 0;\r |
| 61 | pevt_dump();\r |
| 62 | }\r |
| 63 | \r |
| 64 | void PicoPower(void)\r |
| 65 | {\r |
| 66 | Pico.m.frame_count = 0;\r |
| 67 | Pico.t.m68c_cnt = Pico.t.m68c_aim = 0;\r |
| 68 | \r |
| 69 | // clear all memory of the emulated machine\r |
| 70 | memset(&PicoMem,0,sizeof(PicoMem));\r |
| 71 | \r |
| 72 | memset(&Pico.video,0,sizeof(Pico.video));\r |
| 73 | memset(&Pico.m,0,sizeof(Pico.m));\r |
| 74 | memset(&Pico.t,0,sizeof(Pico.t));\r |
| 75 | \r |
| 76 | // my MD1 VA6 console has this in IO\r |
| 77 | PicoMem.ioports[1] = PicoMem.ioports[2] = PicoMem.ioports[3] = 0xff;\r |
| 78 | \r |
| 79 | Pico.video.hint_irq = (PicoIn.AHW & PAHW_PICO ? 5 : 4);\r |
| 80 | \r |
| 81 | if (PicoIn.AHW & PAHW_MCD)\r |
| 82 | PicoPowerMCD();\r |
| 83 | \r |
| 84 | if (PicoIn.opt & POPT_EN_32X)\r |
| 85 | PicoPower32x();\r |
| 86 | \r |
| 87 | PicoReset();\r |
| 88 | \r |
| 89 | // powerup default VDP register values from TMSS BIOS\r |
| 90 | Pico.video.reg[0] = Pico.video.reg[1] = 0x04;\r |
| 91 | Pico.video.reg[0xc] = 0x81;\r |
| 92 | Pico.video.reg[0xf] = 0x02;\r |
| 93 | SATaddr = 0x0000;\r |
| 94 | SATmask = ~0x3ff;\r |
| 95 | }\r |
| 96 | \r |
| 97 | PICO_INTERNAL void PicoDetectRegion(void)\r |
| 98 | {\r |
| 99 | int support=0, hw=0, i;\r |
| 100 | unsigned char pal=0;\r |
| 101 | char *pr = (char *)(Pico.rom + 0x1f0);\r |
| 102 | \r |
| 103 | if (PicoIn.regionOverride)\r |
| 104 | {\r |
| 105 | support = PicoIn.regionOverride;\r |
| 106 | }\r |
| 107 | else if (strcmp(pr, "EUROPE") == 0 || strcmp(pr, "Europe") == 0)\r |
| 108 | {\r |
| 109 | // Unusual cartridge region 'code'\r |
| 110 | support|=8;\r |
| 111 | }\r |
| 112 | else\r |
| 113 | {\r |
| 114 | // Read cartridge region data:\r |
| 115 | unsigned short *rd = (unsigned short *)pr;\r |
| 116 | int region = (rd[0] << 16) | rd[1];\r |
| 117 | \r |
| 118 | for (i = 0; i < 4; i++)\r |
| 119 | {\r |
| 120 | int c;\r |
| 121 | \r |
| 122 | c = region >> (i<<3);\r |
| 123 | c &= 0xff;\r |
| 124 | if (c <= ' ') continue;\r |
| 125 | \r |
| 126 | if (c=='J') support|=1;\r |
| 127 | else if (c=='U') support|=4;\r |
| 128 | else if (c=='E') support|=8;\r |
| 129 | else if (c=='j') {support|=1; break; }\r |
| 130 | else if (c=='u') {support|=4; break; }\r |
| 131 | else if (c=='e') {support|=8; break; }\r |
| 132 | else\r |
| 133 | {\r |
| 134 | // New style code:\r |
| 135 | char s[2]={0,0};\r |
| 136 | s[0]=(char)c;\r |
| 137 | support|=strtol(s,NULL,16);\r |
| 138 | }\r |
| 139 | }\r |
| 140 | }\r |
| 141 | \r |
| 142 | // auto detection order override\r |
| 143 | if (PicoIn.autoRgnOrder) {\r |
| 144 | if (((PicoIn.autoRgnOrder>>0)&0xf) & support) support = (PicoIn.autoRgnOrder>>0)&0xf;\r |
| 145 | else if (((PicoIn.autoRgnOrder>>4)&0xf) & support) support = (PicoIn.autoRgnOrder>>4)&0xf;\r |
| 146 | else if (((PicoIn.autoRgnOrder>>8)&0xf) & support) support = (PicoIn.autoRgnOrder>>8)&0xf;\r |
| 147 | }\r |
| 148 | \r |
| 149 | // Try to pick the best hardware value for English/50hz:\r |
| 150 | if (support&8) { hw=0xc0; pal=1; } // Europe\r |
| 151 | else if (support&4) hw=0x80; // USA\r |
| 152 | else if (support&2) { hw=0x40; pal=1; } // Japan PAL\r |
| 153 | else if (support&1) hw=0x00; // Japan NTSC\r |
| 154 | else hw=0x80; // USA\r |
| 155 | \r |
| 156 | if (!(PicoIn.AHW & PAHW_MCD)) hw |= 0x20; // No disk attached\r |
| 157 | \r |
| 158 | Pico.m.hardware=(unsigned char)hw; \r |
| 159 | Pico.m.pal=pal;\r |
| 160 | }\r |
| 161 | \r |
| 162 | int PicoReset(void)\r |
| 163 | {\r |
| 164 | if (Pico.romsize <= 0)\r |
| 165 | return 1;\r |
| 166 | \r |
| 167 | #if defined(CPU_CMP_R) || defined(CPU_CMP_W) || defined(DRC_CMP)\r |
| 168 | PicoIn.opt |= POPT_DIS_VDP_FIFO|POPT_DIS_IDLE_DET;\r |
| 169 | #endif\r |
| 170 | \r |
| 171 | /* must call now, so that banking is reset, and correct vectors get fetched */\r |
| 172 | if (PicoResetHook)\r |
| 173 | PicoResetHook();\r |
| 174 | \r |
| 175 | memset(&PicoIn.padInt, 0, sizeof(PicoIn.padInt));\r |
| 176 | \r |
| 177 | z80_reset();\r |
| 178 | if (PicoIn.AHW & PAHW_SMS) {\r |
| 179 | PicoResetMS();\r |
| 180 | return 0;\r |
| 181 | }\r |
| 182 | \r |
| 183 | SekReset();\r |
| 184 | // ..but do not reset SekCycle* to not desync with addons\r |
| 185 | \r |
| 186 | // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).\r |
| 187 | SekSetRealTAS(PicoIn.AHW & PAHW_MCD);\r |
| 188 | \r |
| 189 | Pico.m.z80_bank68k = 0;\r |
| 190 | Pico.m.z80_reset = 1;\r |
| 191 | \r |
| 192 | PicoDetectRegion();\r |
| 193 | \r |
| 194 | PicoVideoReset();\r |
| 195 | \r |
| 196 | PsndReset(); // pal must be known here\r |
| 197 | \r |
| 198 | // create an empty "dma" to cause 68k exec start at random frame location\r |
| 199 | Pico.t.m68c_line_start = Pico.t.m68c_aim;\r |
| 200 | PicoVideoFIFOWrite(rand() & 0x1fff, 0, 0, PVS_CPURD);\r |
| 201 | \r |
| 202 | SekFinishIdleDet();\r |
| 203 | \r |
| 204 | if (PicoIn.opt & POPT_EN_32X)\r |
| 205 | PicoReset32x();\r |
| 206 | \r |
| 207 | if (PicoIn.AHW & PAHW_MCD) {\r |
| 208 | PicoResetMCD();\r |
| 209 | return 0;\r |
| 210 | }\r |
| 211 | \r |
| 212 | // reinit, so that checksum checks pass\r |
| 213 | if (!(PicoIn.opt & POPT_DIS_IDLE_DET))\r |
| 214 | SekInitIdleDet();\r |
| 215 | \r |
| 216 | // reset sram state; enable sram access by default if it doesn't overlap with ROM\r |
| 217 | Pico.m.sram_reg = 0;\r |
| 218 | if ((Pico.sv.flags & SRF_EEPROM) || Pico.romsize <= Pico.sv.start)\r |
| 219 | Pico.m.sram_reg |= SRR_MAPPED;\r |
| 220 | \r |
| 221 | if (Pico.sv.flags & SRF_ENABLED)\r |
| 222 | elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", Pico.sv.start, Pico.sv.end,\r |
| 223 | !!(Pico.sv.flags & SRF_EEPROM));\r |
| 224 | \r |
| 225 | return 0;\r |
| 226 | }\r |
| 227 | \r |
| 228 | // flush config changes before emu loop starts\r |
| 229 | void PicoLoopPrepare(void)\r |
| 230 | {\r |
| 231 | if (PicoIn.regionOverride)\r |
| 232 | // force setting possibly changed..\r |
| 233 | Pico.m.pal = (PicoIn.regionOverride == 2 || PicoIn.regionOverride == 8) ? 1 : 0;\r |
| 234 | \r |
| 235 | if (Pico.m.pal) {\r |
| 236 | Pico.t.vcnt_wrap = 0x103;\r |
| 237 | Pico.t.vcnt_adj = 57;\r |
| 238 | }\r |
| 239 | else {\r |
| 240 | Pico.t.vcnt_wrap = 0xEB;\r |
| 241 | Pico.t.vcnt_adj = 6;\r |
| 242 | }\r |
| 243 | PicoVideoFIFOMode(Pico.video.reg[1]&0x40, Pico.video.reg[12]&1);\r |
| 244 | \r |
| 245 | Pico.m.dirtyPal = 1;\r |
| 246 | rendstatus_old = -1;\r |
| 247 | \r |
| 248 | if (PicoIn.AHW & PAHW_MCD)\r |
| 249 | PicoMCDPrepare();\r |
| 250 | if (PicoIn.AHW & PAHW_32X)\r |
| 251 | Pico32xPrepare();\r |
| 252 | }\r |
| 253 | \r |
| 254 | #include "pico_cmn.c"\r |
| 255 | \r |
| 256 | /* sync z80 to 68k */\r |
| 257 | PICO_INTERNAL void PicoSyncZ80(unsigned int m68k_cycles_done)\r |
| 258 | {\r |
| 259 | int m68k_cnt;\r |
| 260 | int cnt;\r |
| 261 | \r |
| 262 | m68k_cnt = m68k_cycles_done - Pico.t.m68c_frame_start;\r |
| 263 | Pico.t.z80c_aim = cycles_68k_to_z80(m68k_cnt);\r |
| 264 | cnt = Pico.t.z80c_aim - Pico.t.z80c_cnt;\r |
| 265 | \r |
| 266 | pprof_start(z80);\r |
| 267 | \r |
| 268 | elprintf(EL_BUSREQ, "z80 sync %i (%u|%u -> %u|%u)", cnt,\r |
| 269 | Pico.t.z80c_cnt, Pico.t.z80c_cnt * 15 / 7 / 488,\r |
| 270 | Pico.t.z80c_aim, Pico.t.z80c_aim * 15 / 7 / 488);\r |
| 271 | \r |
| 272 | if (cnt > 0)\r |
| 273 | Pico.t.z80c_cnt += z80_run(cnt);\r |
| 274 | \r |
| 275 | pprof_end(z80);\r |
| 276 | }\r |
| 277 | \r |
| 278 | \r |
| 279 | void PicoFrame(void)\r |
| 280 | {\r |
| 281 | pprof_start(frame);\r |
| 282 | \r |
| 283 | Pico.m.frame_count++;\r |
| 284 | \r |
| 285 | if (PicoIn.AHW & PAHW_SMS) {\r |
| 286 | PicoFrameMS();\r |
| 287 | goto end;\r |
| 288 | }\r |
| 289 | \r |
| 290 | if (PicoIn.AHW & PAHW_32X) {\r |
| 291 | PicoFrame32x(); // also does MCD+32X\r |
| 292 | goto end;\r |
| 293 | }\r |
| 294 | \r |
| 295 | if (PicoIn.AHW & PAHW_MCD) {\r |
| 296 | PicoFrameMCD();\r |
| 297 | goto end;\r |
| 298 | }\r |
| 299 | \r |
| 300 | //if(Pico.video.reg[12]&0x2) Pico.video.status ^= SR_ODD; // change odd bit in interlace mode\r |
| 301 | \r |
| 302 | PicoFrameStart();\r |
| 303 | PicoFrameHints();\r |
| 304 | \r |
| 305 | end:\r |
| 306 | pprof_end(frame);\r |
| 307 | }\r |
| 308 | \r |
| 309 | void PicoFrameDrawOnly(void)\r |
| 310 | {\r |
| 311 | if (!(PicoIn.AHW & PAHW_SMS)) {\r |
| 312 | PicoFrameStart();\r |
| 313 | PicoDrawSync(Pico.m.pal?239:223, 0, 0);\r |
| 314 | } else {\r |
| 315 | PicoFrameDrawOnlyMS();\r |
| 316 | }\r |
| 317 | }\r |
| 318 | \r |
| 319 | void PicoGetInternal(pint_t which, pint_ret_t *r)\r |
| 320 | {\r |
| 321 | switch (which)\r |
| 322 | {\r |
| 323 | case PI_ROM: r->vptr = Pico.rom; break;\r |
| 324 | case PI_ISPAL: r->vint = Pico.m.pal; break;\r |
| 325 | case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;\r |
| 326 | case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;\r |
| 327 | }\r |
| 328 | }\r |
| 329 | \r |
| 330 | // vim:ts=2:sw=2:expandtab\r |