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- // (c) Copyright 2007 notaz, All rights reserved.
- #include "../PicoInt.h"
- extern unsigned char formatted_bram[4*0x10];
- extern unsigned int s68k_poll_adclk;
- void (*PicoMCDopenTray)(void) = NULL;
- int (*PicoMCDcloseTray)(void) = NULL;
- #define dump_ram(ram,fname) \
- { \
- int i, d; \
- FILE *f; \
- \
- for (i = 0; i < sizeof(ram); i+=2) { \
- d = (ram[i]<<8) | ram[i+1]; \
- *(unsigned short *)(ram+i) = d; \
- } \
- f = fopen(fname, "wb"); \
- if (f) { \
- fwrite(ram, 1, sizeof(ram), f); \
- fclose(f); \
- } \
- for (i = 0; i < sizeof(ram); i+=2) { \
- d = (ram[i]<<8) | ram[i+1]; \
- *(unsigned short *)(ram+i) = d; \
- } \
- }
- PICO_INTERNAL int PicoInitMCD(void)
- {
- SekInitS68k();
- Init_CD_Driver();
- return 0;
- }
- PICO_INTERNAL void PicoExitMCD(void)
- {
- End_CD_Driver();
- //dump_ram(Pico_mcd->prg_ram, "prg.bin");
- //dump_ram(Pico.ram, "ram.bin");
- }
- PICO_INTERNAL int PicoResetMCD(int hard)
- {
- if (hard) {
- int fmt_size = sizeof(formatted_bram);
- memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
- memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
- memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
- memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
- memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
- }
- memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
- memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
- memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
- *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
- Pico_mcd->m.state_flags |= 1; // s68k reset pending
- Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
- Reset_CD();
- LC89510_Reset();
- gfx_cd_reset();
- #ifdef _ASM_CD_MEMORY_C
- PicoMemResetCD(1);
- //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
- #endif
- // use SRam.data for RAM cart
- if (SRam.data) free(SRam.data);
- SRam.data = NULL;
- if (PicoOpt&0x8000)
- SRam.data = calloc(1, 0x12000);
- return 0;
- }
- static __inline void SekRunM68k(int cyc)
- {
- int cyc_do;
- SekCycleAim+=cyc;
- if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
- #if defined(EMU_C68K)
- PicoCpu.cycles=cyc_do;
- CycloneRun(&PicoCpu);
- SekCycleCnt+=cyc_do-PicoCpu.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoM68kCPU);
- SekCycleCnt+=m68k_execute(cyc_do);
- #endif
- }
- static __inline void SekRunS68k(int cyc)
- {
- int cyc_do;
- SekCycleAimS68k+=cyc;
- if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
- #if defined(EMU_C68K)
- PicoCpuS68k.cycles=cyc_do;
- CycloneRun(&PicoCpuS68k);
- SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoS68kCPU);
- SekCycleCntS68k+=m68k_execute(cyc_do);
- #endif
- }
- #define PS_STEP_M68K ((488<<16)/20) // ~24
- //#define PS_STEP_S68K 13
- #ifdef _ASM_CD_PICO_C
- void SekRunPS(int cyc_m68k, int cyc_s68k);
- #else
- static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
- {
- int cycn, cycn_s68k, cyc_do;
- int d_cm = 0, d_cs = 0, ex;
- SekCycleAim+=cyc_m68k;
- SekCycleAimS68k+=cyc_s68k;
- // fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
- // SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
- /* loop 488 downto 0 in steps of PS_STEP */
- for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
- {
- ex = 0;
- cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
- //fprintf(stderr, "%3i/%3i: ", cycn>>16, cycn_s68k);
- if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
- #if defined(EMU_C68K)
- PicoCpu.cycles = cyc_do;
- CycloneRun(&PicoCpu);
- SekCycleCnt += cyc_do - PicoCpu.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoM68kCPU);
- SekCycleCnt += (ex = m68k_execute(cyc_do));
- #endif
- }
- //fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0;
- if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
- #if defined(EMU_C68K)
- PicoCpuS68k.cycles = cyc_do;
- CycloneRun(&PicoCpuS68k);
- SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoS68kCPU);
- SekCycleCntS68k += (ex = m68k_execute(cyc_do));
- #endif
- }
- //fprintf(stderr, "%3i\n", ex); d_cs += ex;
- }
- //fprintf(stderr, "== end %3i/%3i ==\n", d_cm, d_cs);
- }
- #endif
- static __inline void check_cd_dma(void)
- {
- int ddx;
- if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
- ddx = Pico_mcd->s68k_regs[4] & 7;
- if (ddx < 2) return; // invalid
- if (ddx < 4) {
- Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
- return;
- }
- if (ddx == 6) return; // invalid
- Update_CDC_TRansfer(ddx); // now go and do the actual transfer
- }
- static __inline void update_chips(void)
- {
- int counter_timer, int3_set;
- int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
- // 75Hz CDC update
- if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
- Pico_mcd->m.counter75hz -= counter75hz_lim;
- Check_CD_Command();
- }
- // update timers
- counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
- Pico_mcd->m.timer_stopwatch += counter_timer;
- if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
- Pico_mcd->m.timer_int3 -= counter_timer;
- if (Pico_mcd->m.timer_int3 < 0) {
- if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
- dprintf("s68k: timer irq 3");
- SekInterruptS68k(3);
- Pico_mcd->m.timer_int3 += int3_set << 16;
- }
- // is this really what happens if irq3 is masked out?
- Pico_mcd->m.timer_int3 &= 0xffffff;
- }
- }
- // update gfx chip
- if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
- gfx_cd_update();
- // delayed setting of DMNA bit (needed for Silpheed)
- if (Pico_mcd->m.state_flags & 2) {
- Pico_mcd->m.state_flags &= ~2;
- if (!(Pico_mcd->s68k_regs[3] & 4)) {
- Pico_mcd->s68k_regs[3] |= 2;
- Pico_mcd->s68k_regs[3] &= ~1;
- #ifdef USE_POLL_DETECT
- if ((s68k_poll_adclk&0xfe) == 2) {
- SekSetStopS68k(0); s68k_poll_adclk = 0;
- }
- #endif
- }
- }
- }
- static int PicoFrameHintsMCD(void)
- {
- struct PicoVideo *pv=&Pico.video;
- int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
- const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
- int skip=PicoSkipFrame || (PicoOpt&0x10);
- int hint; // Hint counter
- if(Pico.m.pal) { //
- //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
- //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
- lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
- line_sample = 68;
- if(pv->reg[1]&8) lines_vis = 240;
- } else {
- //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
- //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
- lines = 262;
- line_sample = 93;
- }
- SekCyclesReset();
- SekCyclesResetS68k();
- //z80ExtraCycles = 0;
- if(PicoOpt&4)
- z80CycleAim = 0;
- // z80_resetCycles();
- pv->status&=~0x88; // clear V-Int, come out of vblank
- hint=pv->reg[10]; // Load H-Int counter
- //dprintf("-hint: %i", hint);
- for (y=0;y<lines;y++)
- {
- Pico.m.scanline=(short)y;
- // pad delay (for 6 button pads)
- if(PicoOpt&0x20) {
- if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
- if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
- }
- check_cd_dma();
- // H-Interrupts:
- if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
- {
- //dprintf("rhint:old @ %06x", SekPc);
- hint=pv->reg[10]; // Reload H-Int counter
- pv->pending_ints|=0x10;
- if (pv->reg[0]&0x10) SekInterrupt(4);
- //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
- //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
- }
- // V-Interrupt:
- if (y == lines_vis)
- {
- //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
- pv->status|=0x88; // V-Int happened, go into vblank
- SekRunM68k(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
- /*if(Pico.m.z80Run && (PicoOpt&4)) {
- z80CycleAim+=cycles_z80/2;
- total_z80+=z80_run(z80CycleAim-total_z80);
- z80CycleAim-=cycles_z80/2;
- }*/
- pv->pending_ints|=0x20;
- if(pv->reg[1]&0x20) SekInterrupt(6);
- if(Pico.m.z80Run && (PicoOpt&4)) // ?
- z80_int();
- //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
- }
- // decide if we draw this line
- #if CAN_HANDLE_240_LINES
- if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
- #else
- if(!skip && y<224)
- #endif
- PicoLine(y);
- if(PicoOpt&1)
- sound_timers_and_dac(y);
- // get samples from sound chips
- if (y == 224 && PsndOut) {
- int len = sound_render(0, PsndLen);
- if (PicoWriteSound) PicoWriteSound(len);
- // clear sound buffer
- sound_clear();
- }
- // Run scanline:
- //dprintf("m68k starting exec @ %06x", SekPc);
- if (Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
- if ((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) {
- SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync"
- } else {
- SekRunM68k(cycles_68k);
- if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset
- SekRunS68k(cycles_s68k);
- }
- if ((PicoOpt&4) && Pico.m.z80Run) {
- if (Pico.m.z80Run & 2) z80CycleAim+=cycles_z80;
- else {
- int cnt = SekCyclesDone() - z80startCycle;
- cnt = (cnt>>1)-(cnt>>5);
- //if (cnt > cycles_z80) printf("FIXME: z80 cycles: %i\n", cnt);
- if (cnt > cycles_z80) cnt = cycles_z80;
- Pico.m.z80Run |= 2;
- z80CycleAim+=cnt;
- }
- total_z80+=z80_run(z80CycleAim-total_z80);
- }
- update_chips();
- }
- // draw a frame just after vblank in alternative render mode
- if (!PicoSkipFrame && (PicoOpt&0x10))
- PicoFrameFull();
- return 0;
- }
- PICO_INTERNAL int PicoFrameMCD(void)
- {
- if(!(PicoOpt&0x10))
- PicoFrameStart();
- PicoFrameHintsMCD();
- return 0;
- }
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