/* * PicoDrive * (c) Copyright Dave, 2004 * (C) notaz, 2006-2010 * * This work is licensed under the terms of MAME license. * See COPYING file in the top-level directory. */ #include "pico_int.h" #include "sound/ym2612.h" struct Pico Pico; struct PicoMem PicoMem; PicoInterface PicoIn; void (*PicoResetHook)(void) = NULL; void (*PicoLineHook)(void) = NULL; // to be called once on emu init void PicoInit(void) { // Blank space for state: memset(&Pico,0,sizeof(Pico)); memset(&PicoMem,0,sizeof(PicoMem)); memset(&PicoIn.pad,0,sizeof(PicoIn.pad)); memset(&PicoIn.padInt,0,sizeof(PicoIn.padInt)); Pico.est.Pico = &Pico; Pico.est.PicoMem_vram = PicoMem.vram; Pico.est.PicoMem_cram = PicoMem.cram; Pico.est.PicoOpt = &PicoIn.opt; // Init CPUs: SekInit(); z80_init(); // init even if we aren't going to use it PicoInitMCD(); PicoSVPInit(); Pico32xInit(); PsndInit(); PicoVideoInit(); PicoDrawInit(); PicoDraw2Init(); } // to be called once on emu exit void PicoExit(void) { if (PicoIn.AHW & PAHW_MCD) PicoExitMCD(); PicoCartUnload(); z80_exit(); PsndExit(); free(Pico.sv.data); Pico.sv.data = NULL; Pico.sv.start = Pico.sv.end = 0; pevt_dump(); } void PicoPower(void) { Pico.m.frame_count = 0; Pico.t.m68c_cnt = Pico.t.m68c_aim = 0; // clear all memory of the emulated machine memset(&PicoMem,0,sizeof(PicoMem)); memset(&Pico.video,0,sizeof(Pico.video)); memset(&Pico.m,0,sizeof(Pico.m)); memset(&Pico.t,0,sizeof(Pico.t)); Pico.video.pending_ints=0; z80_reset(); // my MD1 VA6 console has this in IO PicoMem.ioports[1] = PicoMem.ioports[2] = PicoMem.ioports[3] = 0xff; // default VDP register values (based on Fusion) Pico.video.reg[0] = Pico.video.reg[1] = 0x04; Pico.video.reg[0xc] = 0x81; Pico.video.reg[0xf] = 0x02; PicoVideoFIFOMode(0, 1); if (PicoIn.AHW & PAHW_MCD) PicoPowerMCD(); if (PicoIn.opt & POPT_EN_32X) PicoPower32x(); PicoReset(); } PICO_INTERNAL void PicoDetectRegion(void) { int support=0, hw=0, i; unsigned char pal=0; if (PicoIn.regionOverride) { support = PicoIn.regionOverride; } else { // Read cartridge region data: unsigned short *rd = (unsigned short *)(Pico.rom + 0x1f0); int region = (rd[0] << 16) | rd[1]; for (i = 0; i < 4; i++) { int c; c = region >> (i<<3); c &= 0xff; if (c <= ' ') continue; if (c=='J') support|=1; else if (c=='U') support|=4; else if (c=='E') support|=8; else if (c=='j') {support|=1; break; } else if (c=='u') {support|=4; break; } else if (c=='e') {support|=8; break; } else { // New style code: char s[2]={0,0}; s[0]=(char)c; support|=strtol(s,NULL,16); } } } // auto detection order override if (PicoIn.autoRgnOrder) { if (((PicoIn.autoRgnOrder>>0)&0xf) & support) support = (PicoIn.autoRgnOrder>>0)&0xf; else if (((PicoIn.autoRgnOrder>>4)&0xf) & support) support = (PicoIn.autoRgnOrder>>4)&0xf; else if (((PicoIn.autoRgnOrder>>8)&0xf) & support) support = (PicoIn.autoRgnOrder>>8)&0xf; } // Try to pick the best hardware value for English/50hz: if (support&8) { hw=0xc0; pal=1; } // Europe else if (support&4) hw=0x80; // USA else if (support&2) { hw=0x40; pal=1; } // Japan PAL else if (support&1) hw=0x00; // Japan NTSC else hw=0x80; // USA Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached Pico.m.pal=pal; } int PicoReset(void) { if (Pico.romsize <= 0) return 1; #if defined(CPU_CMP_R) || defined(CPU_CMP_W) || defined(DRC_CMP) PicoIn.opt |= POPT_DIS_VDP_FIFO|POPT_DIS_IDLE_DET; #endif /* must call now, so that banking is reset, and correct vectors get fetched */ if (PicoResetHook) PicoResetHook(); memset(&PicoIn.padInt, 0, sizeof(PicoIn.padInt)); if (PicoIn.AHW & PAHW_SMS) { PicoResetMS(); return 0; } SekReset(); // ..but do not reset SekCycle* to not desync with addons // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games). SekSetRealTAS(PicoIn.AHW & PAHW_MCD); Pico.m.dirtyPal = 1; Pico.m.z80_bank68k = 0; Pico.m.z80_reset = 1; PicoDetectRegion(); Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal PsndReset(); // pal must be known here // create an empty "dma" to cause 68k exec start at random frame location PicoVideoFIFOWrite(rand() & 0x1fff, 0, 0, PVS_CPURD); SekFinishIdleDet(); if (PicoIn.AHW & PAHW_MCD) { PicoResetMCD(); return 0; } // reinit, so that checksum checks pass if (!(PicoIn.opt & POPT_DIS_IDLE_DET)) SekInitIdleDet(); if (PicoIn.opt & POPT_EN_32X) PicoReset32x(); // reset sram state; enable sram access by default if it doesn't overlap with ROM Pico.m.sram_reg = 0; if ((Pico.sv.flags & SRF_EEPROM) || Pico.romsize <= Pico.sv.start) Pico.m.sram_reg |= SRR_MAPPED; if (Pico.sv.flags & SRF_ENABLED) elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", Pico.sv.start, Pico.sv.end, !!(Pico.sv.flags & SRF_EEPROM)); return 0; } // flush config changes before emu loop starts void PicoLoopPrepare(void) { if (PicoIn.regionOverride) // force setting possibly changed.. Pico.m.pal = (PicoIn.regionOverride == 2 || PicoIn.regionOverride == 8) ? 1 : 0; Pico.m.dirtyPal = 1; rendstatus_old = -1; } #include "pico_cmn.c" /* sync z80 to 68k */ PICO_INTERNAL void PicoSyncZ80(unsigned int m68k_cycles_done) { int m68k_cnt; int cnt; m68k_cnt = m68k_cycles_done - Pico.t.m68c_frame_start; Pico.t.z80c_aim = cycles_68k_to_z80(m68k_cnt); cnt = Pico.t.z80c_aim - Pico.t.z80c_cnt; pprof_start(z80); elprintf(EL_BUSREQ, "z80 sync %i (%u|%u -> %u|%u)", cnt, Pico.t.z80c_cnt, Pico.t.z80c_cnt * 15 / 7 / 488, Pico.t.z80c_aim, Pico.t.z80c_aim * 15 / 7 / 488); if (cnt > 0) Pico.t.z80c_cnt += z80_run(cnt); pprof_end(z80); } void PicoFrame(void) { pprof_start(frame); Pico.m.frame_count++; if (PicoIn.AHW & PAHW_SMS) { PicoFrameMS(); goto end; } if (PicoIn.AHW & PAHW_32X) { PicoFrame32x(); // also does MCD+32X goto end; } if (PicoIn.AHW & PAHW_MCD) { PicoFrameMCD(); goto end; } //if(Pico.video.reg[12]&0x2) Pico.video.status ^= SR_ODD; // change odd bit in interlace mode PicoFrameStart(); PicoFrameHints(); end: pprof_end(frame); } void PicoFrameDrawOnly(void) { if (!(PicoIn.AHW & PAHW_SMS)) { PicoFrameStart(); PicoDrawSync(Pico.m.pal?239:223, 0); } else { PicoFrameDrawOnlyMS(); } } void PicoGetInternal(pint_t which, pint_ret_t *r) { switch (which) { case PI_ROM: r->vptr = Pico.rom; break; case PI_ISPAL: r->vint = Pico.m.pal; break; case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break; case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break; } } // vim:ts=2:sw=2:expandtab