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Prepared the API to set the PIT constant.

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This commit is contained in:
OBattler
2024-03-23 06:15:34 +01:00
parent 01b026c76e
commit 2466da2161
5 changed files with 112 additions and 31 deletions
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38
src/pit.c
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@@ -47,6 +47,7 @@ pit_intf_t pit_devs[2];
double cpuclock;
double PITCONSTD;
double PAS16CONSTD;
double SYSCLK;
double isa_timing;
double bus_timing;
@@ -56,6 +57,7 @@ double PCICLK;
double AGPCLK;
uint64_t PITCONST;
uint64_t PAS16CONST;
uint64_t ISACONST;
uint64_t CGACONST;
uint64_t MDACONST;
@@ -523,7 +525,7 @@ pit_timer_over(void *priv)
for (uint8_t i = 0; i < 3; i++)
pit_ctr_set_clock_common(&dev->counters[i], dev->clock, dev);
timer_advance_u64(&dev->callback_timer, PITCONST >> 1ULL);
timer_advance_u64(&dev->callback_timer, dev->pit_const >> 1ULL);
}
static void
@@ -873,6 +875,20 @@ pit_handler(int set, uint16_t base, int size, void *priv)
io_handler(set, base, size, pit_read, NULL, NULL, pit_write, NULL, NULL, priv);
}
void
pit_set_pit_const(void *data, uint64_t pit_const)
{
pit_t *pit = (pit_t *) data;
pit->pit_const = pit_const;
}
static void
pit_speed_changed(void *priv)
{
pit_set_pit_const(priv, PITCONST);
}
static void
pit_close(void *priv)
{
@@ -896,7 +912,7 @@ pit_init(const device_t *info)
if (!(dev->flags & PIT_PS2) && !(dev->flags & PIT_CUSTOM_CLOCK)) {
timer_add(&dev->callback_timer, pit_timer_over, (void *) dev, 0);
timer_set_delay_u64(&dev->callback_timer, PITCONST >> 1ULL);
timer_set_delay_u64(&dev->callback_timer, dev->pit_const >> 1ULL);
}
dev->flags = info->local;
@@ -919,7 +935,7 @@ const device_t i8253_device = {
.close = pit_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.speed_changed = pit_speed_changed,
.force_redraw = NULL,
.config = NULL
};
@@ -947,7 +963,7 @@ const device_t i8254_device = {
.close = pit_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.speed_changed = pit_speed_changed,
.force_redraw = NULL,
.config = NULL
};
@@ -961,7 +977,7 @@ const device_t i8254_sec_device = {
.close = pit_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.speed_changed = pit_speed_changed,
.force_redraw = NULL,
.config = NULL
};
@@ -989,7 +1005,7 @@ const device_t i8254_ps2_device = {
.close = pit_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.speed_changed = pit_speed_changed,
.force_redraw = NULL,
.config = NULL
};
@@ -1074,6 +1090,12 @@ pit_ps2_init(int type)
return pit;
}
void
pit_change_pas16_const(double prescale)
{
PAS16CONST = (uint64_t) ((PITCONSTD / prescale) * (double) (1ULL << 32));
}
void
pit_set_clock(uint32_t clock)
{
@@ -1169,6 +1191,9 @@ pit_set_clock(uint32_t clock)
TIMER_USEC = (uint64_t) ((cpuclock / 1000000.0) * (double) (1ULL << 32));
PAS16CONSTD = (cpuclock / 441000.0);
PAS16CONST = (uint64_t) (PITCONSTD * (double) (1ULL << 32));
isa_timing = (cpuclock / (double) cpu_isa_speed);
if (cpu_64bitbus)
bus_timing = (cpuclock / (cpu_busspeed / 2));
@@ -1200,5 +1225,6 @@ const pit_intf_t pit_classic_intf = {
&pit_ctr_set_out_func,
&pit_ctr_set_load_func,
&ctr_clock,
&pit_set_pit_const,
NULL,
};