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Rewrote timer code.

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The new code is based on timestamps, rather than delays. This eliminates the
need to update every timer in timer_process(), which cost a non-trivial amount
of CPU time on low-end machines.

This involved changes to every user of the timer code, so this change almost
certainly introduces bugs.
This commit is contained in:
SarahW 2018-08-02 22:06:10 +01:00
commit a7d006b637
79 changed files with 1050 additions and 1033 deletions
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13
src/sound_ps1.c
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@ -13,7 +13,8 @@ typedef struct ps1_audio_t
uint8_t status, ctrl;
int timer_latch, timer_count, timer_enable;
uint64_t timer_latch;
pc_timer_t timer;
uint8_t fifo[2048];
int fifo_read_idx, fifo_write_idx;
@ -89,8 +90,10 @@ static void ps1_audio_write(uint16_t port, uint8_t val, void *p)
break;
case 3: /*Timer reload value*/
ps1->timer_latch = val;
ps1->timer_count = (0xff-val) * TIMER_USEC;
ps1->timer_enable = (val != 0);
if (val)
timer_set_delay_u64(&ps1->timer, (0xff-val) * TIMER_USEC);
else
timer_disable(&ps1->timer);
break;
case 4: /*Almost empty*/
ps1->fifo_threshold = val * 4;
@ -124,7 +127,7 @@ static void ps1_audio_callback(void *p)
ps1->status |= 0x10; /*ADC data ready*/
ps1_update_irq_status(ps1);
ps1->timer_count += ps1->timer_latch * TIMER_USEC;
timer_advance_u64(&ps1->timer, ps1->timer_latch * TIMER_USEC);
}
static void ps1_audio_get_buffer(int32_t *buffer, int len, void *p)
@ -149,7 +152,7 @@ static void *ps1_audio_init()
io_sethandler(0x0200, 0x0001, ps1_audio_read, NULL, NULL, ps1_audio_write, NULL, NULL, ps1);
io_sethandler(0x0202, 0x0006, ps1_audio_read, NULL, NULL, ps1_audio_write, NULL, NULL, ps1);
timer_add(ps1_audio_callback, &ps1->timer_count, &ps1->timer_enable, ps1);
timer_add(&ps1->timer, ps1_audio_callback, ps1, 0);
sound_add_handler(ps1_audio_get_buffer, ps1);
return ps1;