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- /*
- * 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
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