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32x: add preliminary hint emulation

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This commit is contained in:
notaz 2013-08-14 03:36:36 +03:00
parent b011c2af39
commit 5ac99d9adf
3 changed files with 36 additions and 3 deletions
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31
pico/32x/32x.c
View file

@ -228,6 +228,25 @@ static void p32x_start_blank(void)
p32x_sh2_poll_event(&ssh2, SH2_STATE_VPOLL, 0);
}
void p32x_schedule_hint(SH2 *sh2, int m68k_cycles)
{
// rather rough, 32x hint is useless in practice
int after;
if (!((Pico32x.sh2irq_mask[0] | Pico32x.sh2irq_mask[1]) & 4))
return; // nobody cares
// note: when Pico.m.scanline is 224, SH2s might
// still be at scanline 93 (or so)
if (!(Pico32x.sh2_regs[0] & 0x80) && Pico.m.scanline > 224)
return;
after = (Pico32x.sh2_regs[4 / 2] + 1) * 488;
if (sh2 != NULL)
p32x_event_schedule_sh2(sh2, P32X_EVENT_HINT, after);
else
p32x_event_schedule(m68k_cycles, P32X_EVENT_HINT, after);
}
// compare cycles, handling overflows
// check if a > b
#define CYCLES_GT(a, b) \
@ -244,6 +263,13 @@ static void fillend_event(unsigned int now)
p32x_sh2_poll_event(&ssh2, SH2_STATE_VPOLL, now);
}
static void hint_event(unsigned int now)
{
Pico32x.sh2irqs |= P32XI_HINT;
p32x_update_irls(NULL, now);
p32x_schedule_hint(NULL, now);
}
typedef void (event_cb)(unsigned int now);
unsigned int event_times[P32X_EVENT_COUNT];
@ -251,6 +277,7 @@ static unsigned int event_time_next;
static event_cb *event_cbs[] = {
[P32X_EVENT_PWM] = p32x_pwm_irq_event,
[P32X_EVENT_FILLEND] = fillend_event,
[P32X_EVENT_HINT] = hint_event,
};
// schedule event at some time 'after', in m68k clocks
@ -481,10 +508,14 @@ void sync_sh2s_lockstep(unsigned int m68k_target)
void PicoFrame32x(void)
{
Pico.m.scanline = 0;
Pico32x.vdp_regs[0x0a/2] &= ~P32XV_VBLK; // get out of vblank
if ((Pico32x.vdp_regs[0] & P32XV_Mx) != 0) // no forced blanking
Pico32x.vdp_regs[0x0a/2] &= ~P32XV_PEN; // no palette access
if (!(Pico32x.sh2_regs[0] & 0x80))
p32x_schedule_hint(NULL, SekCyclesDoneT2());
p32x_sh2_poll_event(&msh2, SH2_STATE_VPOLL, 0);
p32x_sh2_poll_event(&ssh2, SH2_STATE_VPOLL, 0);

6
pico/32x/memory.c
View file

@ -635,13 +635,13 @@ static void p32x_sh2reg_write8(u32 a, u32 d, SH2 *sh2)
Pico32x.regs[0] |= (d << 8) & P32XS_FM;
return;
case 1: // HEN/irq masks
if ((d ^ Pico32x.sh2_regs[0]) & 0x80)
elprintf(EL_ANOMALY|EL_32X, "HEN");
Pico32x.sh2irq_mask[sh2->is_slave] = d & 0x8f;
Pico32x.sh2irq_mask[sh2->is_slave] = d & 0x0f;
Pico32x.sh2_regs[0] &= ~0x80;
Pico32x.sh2_regs[0] |= d & 0x80;
if (d & 1)
p32x_pwm_schedule_sh2(sh2);
if (d & 4)
p32x_schedule_hint(sh2, 0);
p32x_update_irls(sh2, 0);
return;
case 5: // H count

2
pico/pico_int.h
View file

@ -749,6 +749,7 @@ extern struct Pico32x Pico32x;
enum p32x_event {
P32X_EVENT_PWM,
P32X_EVENT_FILLEND,
P32X_EVENT_HINT,
P32X_EVENT_COUNT,
};
extern unsigned int event_times[P32X_EVENT_COUNT];
@ -766,6 +767,7 @@ void p32x_update_irls(SH2 *active_sh2, int m68k_cycles);
void p32x_reset_sh2s(void);
void p32x_event_schedule(unsigned int now, enum p32x_event event, int after);
void p32x_event_schedule_sh2(SH2 *sh2, enum p32x_event event, int after);
void p32x_schedule_hint(SH2 *sh2, int m68k_cycles);
// 32x/memory.c
struct Pico32xMem *Pico32xMem;