[picodrive.git] / pico / cd / mcd.c

/*
 * PicoDrive
 * (C) notaz, 2007,2013
 *
 * 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];

static unsigned int mcd_m68k_cycle_mult;
static unsigned int mcd_m68k_cycle_base;
static unsigned int mcd_s68k_cycle_base;

void (*PicoMCDopenTray)(void) = NULL;
void (*PicoMCDcloseTray)(void) = NULL;


PICO_INTERNAL void PicoInitMCD(void)
{
  SekInitS68k();
}

PICO_INTERNAL void PicoExitMCD(void)
{
}

PICO_INTERNAL void PicoPowerMCD(void)
{
  SekCycleCntS68k = SekCycleAimS68k = 0;

  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));
  Pico_mcd->s68k_regs[0x38+9] = 0x0f;  // default checksum

  cdc_init();
  cdd_reset();
  gfx_init();

  // cold reset state (tested)
  Pico_mcd->m.state_flags = PCD_ST_S68K_RST;
  Pico_mcd->m.busreq = 2;     // busreq on, s68k in reset
  Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access
  memset(Pico_mcd->bios + 0x70, 0xff, 4);
}

void pcd_soft_reset(void)
{
  // Reset_CD(); // breaks Fahrenheit CD swap

  Pico_mcd->m.s68k_pend_ints = 0;
  cdc_reset();
  cdd_reset();
#ifdef _ASM_CD_MEMORY_C
  //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
#endif

  pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75);

  // TODO: test if register state/timers change
}

PICO_INTERNAL int PicoResetMCD(void)
{
  // reset button doesn't affect MCD hardware

  // 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 SekRunS68k(unsigned int to)
{
  int cyc_do;

  SekCycleAimS68k = to;
  if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0)
    return;

  if (SekShouldInterrupt())
    Pico_mcd->m.s68k_poll_a = 0;

  SekCycleCntS68k += cyc_do;
#if defined(EMU_C68K)
  PicoCpuCS68k.cycles = cyc_do;
  CycloneRun(&PicoCpuCS68k);
  SekCycleCntS68k -= PicoCpuCS68k.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoCpuMS68k);
  SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do;
  m68k_set_context(&PicoCpuMM68k);
#elif defined(EMU_F68K)
  g_m68kcontext = &PicoCpuFS68k;
  SekCycleCntS68k += fm68k_emulate(cyc_do, 0) - cyc_do;
  g_m68kcontext = &PicoCpuFM68k;
#endif
}

static void pcd_set_cycle_mult(void)
{
  // ~1.63 for NTSC, ~1.645 for PAL
  if (Pico.m.pal)
    mcd_m68k_cycle_mult = ((12500000ull << 16) / (50*312*488));
  else
    mcd_m68k_cycle_mult = ((12500000ull << 16) / (60*262*488)) + 1;
}

unsigned int pcd_cycles_m68k_to_s68k(unsigned int c)
{
  return (long long)c * mcd_m68k_cycle_mult >> 16;
}

/* events */
static void pcd_cdc_event(unsigned int now)
{
  // 75Hz CDC update
  cdd_update();

  /* check if a new CDD command has been processed */
  if (!(Pico_mcd->s68k_regs[0x4b] & 0xf0))
  {
    /* reset CDD command wait flag */
    Pico_mcd->s68k_regs[0x4b] = 0xf0;

    if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN4) {
      elprintf(EL_INTS|EL_CD, "s68k: cdd irq 4");
      SekInterruptS68k(4);
    }
  }

  pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75);
}

static void pcd_int3_timer_event(unsigned int now)
{
  if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN3) {
    elprintf(EL_INTS|EL_CD, "s68k: timer irq 3");
    SekInterruptS68k(3);
  }

  if (Pico_mcd->s68k_regs[0x31] != 0)
    pcd_event_schedule(now, PCD_EVENT_TIMER3,
      Pico_mcd->s68k_regs[0x31] * 384);
}

static void pcd_dma_event(unsigned int now)
{
  cdc_dma_update();
}

typedef void (event_cb)(unsigned int now);

/* times are in s68k (12.5MHz) cycles */
unsigned int pcd_event_times[PCD_EVENT_COUNT];
static unsigned int event_time_next;
static event_cb *pcd_event_cbs[PCD_EVENT_COUNT] = {
  [PCD_EVENT_CDC]      = pcd_cdc_event,
  [PCD_EVENT_TIMER3]   = pcd_int3_timer_event,
  [PCD_EVENT_GFX]      = gfx_update,
  [PCD_EVENT_DMA]      = pcd_dma_event,
};

void pcd_event_schedule(unsigned int now, enum pcd_event event, int after)
{
  unsigned int when;

  when = now + after;
  if (when == 0) {
    // event cancelled
    pcd_event_times[event] = 0;
    return;
  }

  when |= 1;

  elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when);
  pcd_event_times[event] = when;

  if (event_time_next == 0 || CYCLES_GT(event_time_next, when))
    event_time_next = when;
}

void pcd_event_schedule_s68k(enum pcd_event event, int after)
{
  if (SekCyclesLeftS68k > after)
    SekEndRunS68k(after);

  pcd_event_schedule(SekCyclesDoneS68k(), event, after);
}

static void pcd_run_events(unsigned int until)
{
  int oldest, oldest_diff, time;
  int i, diff;

  while (1) {
    oldest = -1, oldest_diff = 0x7fffffff;

    for (i = 0; i < PCD_EVENT_COUNT; i++) {
      if (pcd_event_times[i]) {
        diff = pcd_event_times[i] - until;
        if (diff < oldest_diff) {
          oldest_diff = diff;
          oldest = i;
        }
      }
    }

    if (oldest_diff <= 0) {
      time = pcd_event_times[oldest];
      pcd_event_times[oldest] = 0;
      elprintf(EL_CD, "cd: run event #%d %u", oldest, time);
      pcd_event_cbs[oldest](time);
    }
    else if (oldest_diff < 0x7fffffff) {
      event_time_next = pcd_event_times[oldest];
      break;
    }
    else {
      event_time_next = 0;
      break;
    }
  }

  if (oldest != -1)
    elprintf(EL_CD, "cd: next event #%d at %u",
      oldest, event_time_next);
}

int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync)
{
  #define now SekCycleCntS68k
  unsigned int s68k_target;
  unsigned int target;

  target = m68k_target - mcd_m68k_cycle_base;
  s68k_target = mcd_s68k_cycle_base +
    ((unsigned long long)target * mcd_m68k_cycle_mult >> 16);

  elprintf(EL_CD, "s68k sync to %u, %u->%u",
    m68k_target, now, s68k_target);

  if (Pico_mcd->m.busreq != 1) { /* busreq/reset */
    SekCycleCntS68k = SekCycleAimS68k = s68k_target;
    pcd_run_events(m68k_target);
    return 0;
  }

  while (CYCLES_GT(s68k_target, now)) {
    if (event_time_next && CYCLES_GE(now, event_time_next))
      pcd_run_events(now);

    target = s68k_target;
    if (event_time_next && CYCLES_GT(target, event_time_next))
      target = event_time_next;

    SekRunS68k(target);
    if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0)
      break;
  }

  return s68k_target - now;
  #undef now
}

#define pcd_run_cpus_normal pcd_run_cpus
//#define pcd_run_cpus_lockstep pcd_run_cpus

static void SekSyncM68k(void);

void pcd_run_cpus_normal(int m68k_cycles)
{
  SekCycleAim += m68k_cycles;
  if (SekShouldInterrupt() || Pico_mcd->m.m68k_poll_cnt < 12)
    Pico_mcd->m.m68k_poll_cnt = 0;
  else if (Pico_mcd->m.m68k_poll_cnt >= 16) {
    int s68k_left = pcd_sync_s68k(SekCycleAim, 1);
    if (s68k_left <= 0) {
      elprintf(EL_CDPOLL, "m68k poll [%02x] x%d @%06x",
        Pico_mcd->m.m68k_poll_a, Pico_mcd->m.m68k_poll_cnt, SekPc);
      SekCycleCnt = SekCycleAim;
      return;
    }
    SekCycleCnt = SekCycleAim - (s68k_left * 40220 >> 16);
  }

  SekSyncM68k();
}

void pcd_run_cpus_lockstep(int m68k_cycles)
{
  unsigned int target = SekCycleAim + m68k_cycles;
  do {
    SekCycleAim += 8;
    SekSyncM68k();
    pcd_sync_s68k(SekCycleAim, 0);
  } while (CYCLES_GT(target, SekCycleAim));

  SekCycleAim = target;
}

#define PICO_CD
#define CPUS_RUN(m68k_cycles) \
  pcd_run_cpus(m68k_cycles)

#include "../pico_cmn.c"


void pcd_prepare_frame(void)
{
  pcd_set_cycle_mult();

  // need this because we can't have direct mapping between
  // master<->slave cycle counters because of overflows
  mcd_m68k_cycle_base = SekCycleAim;
  mcd_s68k_cycle_base = SekCycleAimS68k;
}

PICO_INTERNAL void PicoFrameMCD(void)
{
  PicoFrameStart();

  pcd_prepare_frame();
  PicoFrameHints();
}

void pcd_state_loaded(void)
{
  unsigned int cycles;
  int diff;

  pcd_set_cycle_mult();
  pcd_state_loaded_mem();

  memset(Pico_mcd->pcm_mixbuf, 0, sizeof(Pico_mcd->pcm_mixbuf));
  Pico_mcd->pcm_mixbuf_dirty = 0;
  Pico_mcd->pcm_mixpos = 0;
  Pico_mcd->pcm_regs_dirty = 1;

  // old savestates..
  cycles = pcd_cycles_m68k_to_s68k(SekCycleAim);
  diff = cycles - SekCycleAimS68k;
  if (diff < -1000 || diff > 1000) {
    SekCycleCntS68k = SekCycleAimS68k = cycles;
  }
  if (pcd_event_times[PCD_EVENT_CDC] == 0) {
    pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_CDC, 12500000/75);

    if (Pico_mcd->s68k_regs[0x31])
      pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3,
        Pico_mcd->s68k_regs[0x31] * 384);
  }

  diff = cycles - Pico_mcd->pcm.update_cycles;
  if ((unsigned int)diff > 12500000/50)
    Pico_mcd->pcm.update_cycles = cycles;

  // reschedule
  event_time_next = 0;
  pcd_run_events(SekCycleCntS68k);
}

// vim:shiftwidth=2:ts=2:expandtab
Commit	Line	Data
	1	/*
	2	* PicoDrive
	3	* (C) notaz, 2007,2013
	4	*
	5	* This work is licensed under the terms of MAME license.
	6	* See COPYING file in the top-level directory.
	7	*/
	8
	9	#include "../pico_int.h"
	10	#include "../sound/ym2612.h"
	11
	12	extern unsigned char formatted_bram[4*0x10];
	13
	14	static unsigned int mcd_m68k_cycle_mult;
	15	static unsigned int mcd_m68k_cycle_base;
	16	static unsigned int mcd_s68k_cycle_base;
	17
	18	void (*PicoMCDopenTray)(void) = NULL;
	19	void (*PicoMCDcloseTray)(void) = NULL;
	20
	21
	22	PICO_INTERNAL void PicoInitMCD(void)
	23	{
	24	SekInitS68k();
	25	}
	26
	27	PICO_INTERNAL void PicoExitMCD(void)
	28	{
	29	}
	30
	31	PICO_INTERNAL void PicoPowerMCD(void)
	32	{
	33	SekCycleCntS68k = SekCycleAimS68k = 0;
	34
	35	int fmt_size = sizeof(formatted_bram);
	36	memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
	37	memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
	38	memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
	39	memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
	40	memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size,
	41	formatted_bram, fmt_size);
	42	memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
	43	memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
	44	memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
	45	Pico_mcd->s68k_regs[0x38+9] = 0x0f; // default checksum
	46
	47	cdc_init();
	48	cdd_reset();
	49	gfx_init();
	50
	51	// cold reset state (tested)
	52	Pico_mcd->m.state_flags = PCD_ST_S68K_RST;
	53	Pico_mcd->m.busreq = 2; // busreq on, s68k in reset
	54	Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access
	55	memset(Pico_mcd->bios + 0x70, 0xff, 4);
	56	}
	57
	58	void pcd_soft_reset(void)
	59	{
	60	// Reset_CD(); // breaks Fahrenheit CD swap
	61
	62	Pico_mcd->m.s68k_pend_ints = 0;
	63	cdc_reset();
	64	cdd_reset();
	65	#ifdef _ASM_CD_MEMORY_C
	66	//PicoMemResetCDdecode(1); // don't have to call this in 2M mode
	67	#endif
	68
	69	pcd_event_schedule_s68k(PCD_EVENT_CDC, 12500000/75);
	70
	71	// TODO: test if register state/timers change
	72	}
	73
	74	PICO_INTERNAL int PicoResetMCD(void)
	75	{
	76	// reset button doesn't affect MCD hardware
	77
	78	// use SRam.data for RAM cart
	79	if (PicoOpt & POPT_EN_MCD_RAMCART) {
	80	if (SRam.data == NULL)
	81	SRam.data = calloc(1, 0x12000);
	82	}
	83	else if (SRam.data != NULL) {
	84	free(SRam.data);
	85	SRam.data = NULL;
	86	}
	87	SRam.start = SRam.end = 0; // unused
	88
	89	return 0;
	90	}
	91
	92	static __inline void SekRunS68k(unsigned int to)
	93	{
	94	int cyc_do;
	95
	96	SekCycleAimS68k = to;
	97	if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0)
	98	return;
	99
	100	if (SekShouldInterrupt())
	101	Pico_mcd->m.s68k_poll_a = 0;
	102
	103	SekCycleCntS68k += cyc_do;
	104	#if defined(EMU_C68K)
	105	PicoCpuCS68k.cycles = cyc_do;
	106	CycloneRun(&PicoCpuCS68k);
	107	SekCycleCntS68k -= PicoCpuCS68k.cycles;
	108	#elif defined(EMU_M68K)
	109	m68k_set_context(&PicoCpuMS68k);
	110	SekCycleCntS68k += m68k_execute(cyc_do) - cyc_do;
	111	m68k_set_context(&PicoCpuMM68k);
	112	#elif defined(EMU_F68K)
	113	g_m68kcontext = &PicoCpuFS68k;
	114	SekCycleCntS68k += fm68k_emulate(cyc_do, 0) - cyc_do;
	115	g_m68kcontext = &PicoCpuFM68k;
	116	#endif
	117	}
	118
	119	static void pcd_set_cycle_mult(void)
	120	{
	121	// ~1.63 for NTSC, ~1.645 for PAL
	122	if (Pico.m.pal)
	123	mcd_m68k_cycle_mult = ((12500000ull << 16) / (50312488));
	124	else
	125	mcd_m68k_cycle_mult = ((12500000ull << 16) / (60262488)) + 1;
	126	}
	127
	128	unsigned int pcd_cycles_m68k_to_s68k(unsigned int c)
	129	{
	130	return (long long)c * mcd_m68k_cycle_mult >> 16;
	131	}
	132
	133	/* events */
	134	static void pcd_cdc_event(unsigned int now)
	135	{
	136	// 75Hz CDC update
	137	cdd_update();
	138
	139	/* check if a new CDD command has been processed */
	140	if (!(Pico_mcd->s68k_regs[0x4b] & 0xf0))
	141	{
	142	/* reset CDD command wait flag */
	143	Pico_mcd->s68k_regs[0x4b] = 0xf0;
	144
	145	if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN4) {
	146	elprintf(EL_INTS\|EL_CD, "s68k: cdd irq 4");
	147	SekInterruptS68k(4);
	148	}
	149	}
	150
	151	pcd_event_schedule(now, PCD_EVENT_CDC, 12500000/75);
	152	}
	153
	154	static void pcd_int3_timer_event(unsigned int now)
	155	{
	156	if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN3) {
	157	elprintf(EL_INTS\|EL_CD, "s68k: timer irq 3");
	158	SekInterruptS68k(3);
	159	}
	160
	161	if (Pico_mcd->s68k_regs[0x31] != 0)
	162	pcd_event_schedule(now, PCD_EVENT_TIMER3,
	163	Pico_mcd->s68k_regs[0x31] * 384);
	164	}
	165
	166	static void pcd_dma_event(unsigned int now)
	167	{
	168	cdc_dma_update();
	169	}
	170
	171	typedef void (event_cb)(unsigned int now);
	172
	173	/* times are in s68k (12.5MHz) cycles */
	174	unsigned int pcd_event_times[PCD_EVENT_COUNT];
	175	static unsigned int event_time_next;
	176	static event_cb *pcd_event_cbs[PCD_EVENT_COUNT] = {
	177	[PCD_EVENT_CDC] = pcd_cdc_event,
	178	[PCD_EVENT_TIMER3] = pcd_int3_timer_event,
	179	[PCD_EVENT_GFX] = gfx_update,
	180	[PCD_EVENT_DMA] = pcd_dma_event,
	181	};
	182
	183	void pcd_event_schedule(unsigned int now, enum pcd_event event, int after)
	184	{
	185	unsigned int when;
	186
	187	when = now + after;
	188	if (when == 0) {
	189	// event cancelled
	190	pcd_event_times[event] = 0;
	191	return;
	192	}
	193
	194	when \|= 1;
	195
	196	elprintf(EL_CD, "cd: new event #%u %u->%u", event, now, when);
	197	pcd_event_times[event] = when;
	198
	199	if (event_time_next == 0 \|\| CYCLES_GT(event_time_next, when))
	200	event_time_next = when;
	201	}
	202
	203	void pcd_event_schedule_s68k(enum pcd_event event, int after)
	204	{
	205	if (SekCyclesLeftS68k > after)
	206	SekEndRunS68k(after);
	207
	208	pcd_event_schedule(SekCyclesDoneS68k(), event, after);
	209	}
	210
	211	static void pcd_run_events(unsigned int until)
	212	{
	213	int oldest, oldest_diff, time;
	214	int i, diff;
	215
	216	while (1) {
	217	oldest = -1, oldest_diff = 0x7fffffff;
	218
	219	for (i = 0; i < PCD_EVENT_COUNT; i++) {
	220	if (pcd_event_times[i]) {
	221	diff = pcd_event_times[i] - until;
	222	if (diff < oldest_diff) {
	223	oldest_diff = diff;
	224	oldest = i;
	225	}
	226	}
	227	}
	228
	229	if (oldest_diff <= 0) {
	230	time = pcd_event_times[oldest];
	231	pcd_event_times[oldest] = 0;
	232	elprintf(EL_CD, "cd: run event #%d %u", oldest, time);
	233	pcd_event_cbs[oldest](time);
	234	}
	235	else if (oldest_diff < 0x7fffffff) {
	236	event_time_next = pcd_event_times[oldest];
	237	break;
	238	}
	239	else {
	240	event_time_next = 0;
	241	break;
	242	}
	243	}
	244
	245	if (oldest != -1)
	246	elprintf(EL_CD, "cd: next event #%d at %u",
	247	oldest, event_time_next);
	248	}
	249
	250	int pcd_sync_s68k(unsigned int m68k_target, int m68k_poll_sync)
	251	{
	252	#define now SekCycleCntS68k
	253	unsigned int s68k_target;
	254	unsigned int target;
	255
	256	target = m68k_target - mcd_m68k_cycle_base;
	257	s68k_target = mcd_s68k_cycle_base +
	258	((unsigned long long)target * mcd_m68k_cycle_mult >> 16);
	259
	260	elprintf(EL_CD, "s68k sync to %u, %u->%u",
	261	m68k_target, now, s68k_target);
	262
	263	if (Pico_mcd->m.busreq != 1) { /* busreq/reset */
	264	SekCycleCntS68k = SekCycleAimS68k = s68k_target;
	265	pcd_run_events(m68k_target);
	266	return 0;
	267	}
	268
	269	while (CYCLES_GT(s68k_target, now)) {
	270	if (event_time_next && CYCLES_GE(now, event_time_next))
	271	pcd_run_events(now);
	272
	273	target = s68k_target;
	274	if (event_time_next && CYCLES_GT(target, event_time_next))
	275	target = event_time_next;
	276
	277	SekRunS68k(target);
	278	if (m68k_poll_sync && Pico_mcd->m.m68k_poll_cnt == 0)
	279	break;
	280	}
	281
	282	return s68k_target - now;
	283	#undef now
	284	}
	285
	286	#define pcd_run_cpus_normal pcd_run_cpus
	287	//#define pcd_run_cpus_lockstep pcd_run_cpus
	288
	289	static void SekSyncM68k(void);
	290
	291	void pcd_run_cpus_normal(int m68k_cycles)
	292	{
	293	SekCycleAim += m68k_cycles;
	294	if (SekShouldInterrupt() \|\| Pico_mcd->m.m68k_poll_cnt < 12)
	295	Pico_mcd->m.m68k_poll_cnt = 0;
	296	else if (Pico_mcd->m.m68k_poll_cnt >= 16) {
	297	int s68k_left = pcd_sync_s68k(SekCycleAim, 1);
	298	if (s68k_left <= 0) {
	299	elprintf(EL_CDPOLL, "m68k poll [%02x] x%d @%06x",
	300	Pico_mcd->m.m68k_poll_a, Pico_mcd->m.m68k_poll_cnt, SekPc);
	301	SekCycleCnt = SekCycleAim;
	302	return;
	303	}
	304	SekCycleCnt = SekCycleAim - (s68k_left * 40220 >> 16);
	305	}
	306
	307	SekSyncM68k();
	308	}
	309
	310	void pcd_run_cpus_lockstep(int m68k_cycles)
	311	{
	312	unsigned int target = SekCycleAim + m68k_cycles;
	313	do {
	314	SekCycleAim += 8;
	315	SekSyncM68k();
	316	pcd_sync_s68k(SekCycleAim, 0);
	317	} while (CYCLES_GT(target, SekCycleAim));
	318
	319	SekCycleAim = target;
	320	}
	321
	322	#define PICO_CD
	323	#define CPUS_RUN(m68k_cycles) \
	324	pcd_run_cpus(m68k_cycles)
	325
	326	#include "../pico_cmn.c"
	327
	328
	329	void pcd_prepare_frame(void)
	330	{
	331	pcd_set_cycle_mult();
	332
	333	// need this because we can't have direct mapping between
	334	// master<->slave cycle counters because of overflows
	335	mcd_m68k_cycle_base = SekCycleAim;
	336	mcd_s68k_cycle_base = SekCycleAimS68k;
	337	}
	338
	339	PICO_INTERNAL void PicoFrameMCD(void)
	340	{
	341	PicoFrameStart();
	342
	343	pcd_prepare_frame();
	344	PicoFrameHints();
	345	}
	346
	347	void pcd_state_loaded(void)
	348	{
	349	unsigned int cycles;
	350	int diff;
	351
	352	pcd_set_cycle_mult();
	353	pcd_state_loaded_mem();
	354
	355	memset(Pico_mcd->pcm_mixbuf, 0, sizeof(Pico_mcd->pcm_mixbuf));
	356	Pico_mcd->pcm_mixbuf_dirty = 0;
	357	Pico_mcd->pcm_mixpos = 0;
	358	Pico_mcd->pcm_regs_dirty = 1;
	359
	360	// old savestates..
	361	cycles = pcd_cycles_m68k_to_s68k(SekCycleAim);
	362	diff = cycles - SekCycleAimS68k;
	363	if (diff < -1000 \|\| diff > 1000) {
	364	SekCycleCntS68k = SekCycleAimS68k = cycles;
	365	}
	366	if (pcd_event_times[PCD_EVENT_CDC] == 0) {
	367	pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_CDC, 12500000/75);
	368
	369	if (Pico_mcd->s68k_regs[0x31])
	370	pcd_event_schedule(SekCycleAimS68k, PCD_EVENT_TIMER3,
	371	Pico_mcd->s68k_regs[0x31] * 384);
	372	}
	373
	374	diff = cycles - Pico_mcd->pcm.update_cycles;
	375	if ((unsigned int)diff > 12500000/50)
	376	Pico_mcd->pcm.update_cycles = cycles;
	377
	378	// reschedule
	379	event_time_next = 0;
	380	pcd_run_events(SekCycleCntS68k);
	381	}
	382
	383	// vim:shiftwidth=2:ts=2:expandtab