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- /*
- * PicoDrive
- * (C) notaz, 2007
- *
- * 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"
- extern unsigned char formatted_bram[4*0x10];
- extern unsigned int s68k_poll_adclk;
- void (*PicoMCDopenTray)(void) = NULL;
- void (*PicoMCDcloseTray)(void) = NULL;
- PICO_INTERNAL void PicoInitMCD(void)
- {
- SekInitS68k();
- Init_CD_Driver();
- }
- PICO_INTERNAL void PicoExitMCD(void)
- {
- End_CD_Driver();
- }
- PICO_INTERNAL void PicoPowerMCD(void)
- {
- 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);
- }
- PICO_INTERNAL int PicoResetMCD(void)
- {
- 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
- //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
- #endif
- // use SRam.data for RAM cart
- if (PicoOpt & POPT_EN_MCD_RAMCART) {
- if (SRam.data == NULL)
- SRam.data = calloc(1, 0x12000);
- }
- else if (SRam.data != NULL) {
- free(SRam.data);
- SRam.data = NULL;
- }
- SRam.start = SRam.end = 0; // unused
- return 0;
- }
- static __inline void SekRunM68k(int cyc)
- {
- int cyc_do;
- pprof_start(m68k);
- SekCycleAim+=cyc;
- if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
- #if defined(EMU_CORE_DEBUG)
- SekCycleCnt+=CM_compareRun(cyc_do, 0);
- #elif defined(EMU_C68K)
- PicoCpuCM68k.cycles=cyc_do;
- CycloneRun(&PicoCpuCM68k);
- SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoCpuMM68k);
- SekCycleCnt+=m68k_execute(cyc_do);
- #elif defined(EMU_F68K)
- g_m68kcontext=&PicoCpuFM68k;
- SekCycleCnt+=fm68k_emulate(cyc_do, 0, 0);
- #endif
- pprof_end(m68k);
- }
- static __inline void SekRunS68k(int cyc)
- {
- int cyc_do;
- SekCycleAimS68k+=cyc;
- if ((cyc_do=SekCycleAimS68k-SekCycleCntS68k) <= 0) return;
- #if defined(EMU_CORE_DEBUG)
- SekCycleCntS68k+=CM_compareRun(cyc_do, 1);
- #elif defined(EMU_C68K)
- PicoCpuCS68k.cycles=cyc_do;
- CycloneRun(&PicoCpuCS68k);
- SekCycleCntS68k+=cyc_do-PicoCpuCS68k.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoCpuMS68k);
- SekCycleCntS68k+=m68k_execute(cyc_do);
- #elif defined(EMU_F68K)
- g_m68kcontext=&PicoCpuFS68k;
- SekCycleCntS68k+=fm68k_emulate(cyc_do, 0, 0);
- #endif
- }
- #define PS_STEP_M68K ((488<<16)/20) // ~24
- //#define PS_STEP_S68K 13
- #if defined(_ASM_CD_PICO_C)
- extern void SekRunPS(int cyc_m68k, int cyc_s68k);
- #elif defined(EMU_F68K)
- static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
- {
- SekCycleAim+=cyc_m68k;
- SekCycleAimS68k+=cyc_s68k;
- fm68k_emulate(0, 1, 0);
- }
- #else
- static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
- {
- int cycn, cycn_s68k, cyc_do;
- 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)
- {
- cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
- if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
- #if defined(EMU_C68K)
- PicoCpuCM68k.cycles = cyc_do;
- CycloneRun(&PicoCpuCM68k);
- SekCycleCnt += cyc_do - PicoCpuCM68k.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoCpuMM68k);
- SekCycleCnt += m68k_execute(cyc_do);
- #elif defined(EMU_F68K)
- g_m68kcontext = &PicoCpuFM68k;
- SekCycleCnt += fm68k_emulate(cyc_do, 0, 0);
- #endif
- }
- if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
- #if defined(EMU_C68K)
- PicoCpuCS68k.cycles = cyc_do;
- CycloneRun(&PicoCpuCS68k);
- SekCycleCntS68k += cyc_do - PicoCpuCS68k.cycles;
- #elif defined(EMU_M68K)
- m68k_set_context(&PicoCpuMS68k);
- SekCycleCntS68k += m68k_execute(cyc_do);
- #elif defined(EMU_F68K)
- g_m68kcontext = &PicoCpuFS68k;
- SekCycleCntS68k += fm68k_emulate(cyc_do, 0, 0);
- #endif
- }
- }
- }
- #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)) {
- elprintf(EL_INTS, "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();
- }
- #define PICO_CD
- #define CPUS_RUN(m68k_cycles,s68k_cycles) \
- { \
- if ((PicoOpt&POPT_EN_MCD_PSYNC) && (Pico_mcd->m.busreq&3) == 1) { \
- SekRunPS(m68k_cycles, s68k_cycles); /* "better/perfect sync" */ \
- } else { \
- SekRunM68k(m68k_cycles); \
- if ((Pico_mcd->m.busreq&3) == 1) /* no busreq/no reset */ \
- SekRunS68k(s68k_cycles); \
- } \
- }
- #include "../pico_cmn.c"
- PICO_INTERNAL void PicoFrameMCD(void)
- {
- if (!(PicoOpt&POPT_ALT_RENDERER))
- PicoFrameStart();
- PicoFrameHints();
- }
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