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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;
- int PicoOpt;
- int PicoSkipFrame; // skip rendering frame?
- int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU
- int PicoPadInt[2]; // internal copy
- int PicoAHW; // active addon hardware: PAHW_*
- int PicoQuirks; // game-specific quirks
- int PicoRegionOverride; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
- int PicoAutoRgnOrder;
- int emustatus; // rapid_ym2612, multi_ym_updates
- void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
- 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(&PicoPad,0,sizeof(PicoPad));
- memset(&PicoPadInt,0,sizeof(PicoPadInt));
- Pico.est.Pico = &Pico;
- Pico.est.PicoMem_vram = PicoMem.vram;
- Pico.est.PicoMem_cram = PicoMem.cram;
- Pico.est.PicoOpt = &PicoOpt;
- // Init CPUs:
- SekInit();
- z80_init(); // init even if we aren't going to use it
- PicoInitMCD();
- PicoSVPInit();
- Pico32xInit();
- PicoDrawInit();
- PicoDraw2Init();
- }
- // to be called once on emu exit
- void PicoExit(void)
- {
- if (PicoAHW & PAHW_MCD)
- PicoExitMCD();
- PicoCartUnload();
- z80_exit();
- if (Pico.sv.data)
- free(Pico.sv.data);
- 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));
- 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;
- if (PicoAHW & PAHW_MCD)
- PicoPowerMCD();
- if (PicoOpt & POPT_EN_32X)
- PicoPower32x();
- PicoReset();
- }
- PICO_INTERNAL void PicoDetectRegion(void)
- {
- int support=0, hw=0, i;
- unsigned char pal=0;
- if (PicoRegionOverride)
- {
- support = PicoRegionOverride;
- }
- 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 (PicoAutoRgnOrder) {
- if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;
- else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;
- else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>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)
- PicoOpt |= 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(&PicoPadInt,0,sizeof(PicoPadInt));
- emustatus = 0;
- if (PicoAHW & 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(PicoAHW & 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
- if (Pico.m.dma_xfers == 0 && !(PicoOpt & POPT_DIS_VDP_FIFO))
- Pico.m.dma_xfers = rand() & 0x1fff;
- SekFinishIdleDet();
- if (PicoAHW & PAHW_MCD) {
- PicoResetMCD();
- return 0;
- }
- // reinit, so that checksum checks pass
- if (!(PicoOpt & POPT_DIS_IDLE_DET))
- SekInitIdleDet();
- if (PicoOpt & 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 (PicoRegionOverride)
- // force setting possibly changed..
- Pico.m.pal = (PicoRegionOverride == 2 || PicoRegionOverride == 8) ? 1 : 0;
- Pico.m.dirtyPal = 1;
- rendstatus_old = -1;
- }
- // this table is wrong and should be removed
- // keeping it for now to compensate wrong timing elswhere, mainly for Outrunners
- static const int dma_timings[] = {
- 83, 166, 83, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
- 102, 204, 102, 102, // vblank: 40cell:
- 8, 16, 8, 8, // active: 32cell:
- 17, 18, 9, 9 // ...
- };
- static const int dma_bsycles[] = {
- (488<<8)/83, (488<<8)/166, (488<<8)/83, (488<<8)/83,
- (488<<8)/102, (488<<8)/204, (488<<8)/102, (488<<8)/102,
- (488<<8)/8, (488<<8)/16, (488<<8)/8, (488<<8)/8,
- (488<<8)/9, (488<<8)/18, (488<<8)/9, (488<<8)/9
- };
- // grossly inaccurate.. FIXME FIXXXMEE
- PICO_INTERNAL int CheckDMA(void)
- {
- int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
- int xfers = Pico.m.dma_xfers;
- int dma_op1;
- if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens
- dma_op1 = dma_op;
- if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
- if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
- xfers_can = dma_timings[dma_op];
- if(xfers <= xfers_can)
- {
- if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
- else {
- burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..
- }
- Pico.m.dma_xfers = 0;
- } else {
- if(!(dma_op&2)) burn = 488;
- Pico.m.dma_xfers -= xfers_can;
- }
- elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%u]",
- Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());
- //dprintf("~aim: %i, cnt: %i", Pico.t.m68c_aim, Pico.t.m68c_cnt);
- return burn;
- }
- #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 (PicoAHW & PAHW_SMS) {
- PicoFrameMS();
- goto end;
- }
- if (PicoAHW & PAHW_32X) {
- PicoFrame32x(); // also does MCD+32X
- goto end;
- }
- if (PicoAHW & PAHW_MCD) {
- PicoFrameMCD();
- goto end;
- }
- //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
- PicoFrameStart();
- PicoFrameHints();
- end:
- pprof_end(frame);
- }
- void PicoFrameDrawOnly(void)
- {
- if (!(PicoAHW & PAHW_SMS)) {
- PicoFrameStart();
- PicoDrawSync(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;
- }
- }
- // callback to output message from emu
- void (*PicoMessage)(const char *msg)=NULL;
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