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PIT: add alternative faster PIT

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This is enabled by default on 486+ CPUs and can be forced disabled/enabled with pit_mode=0/1
This commit is contained in:
Adrien Moulin
2022-07-23 13:38:10 +02:00
parent 23e082aeea
commit 2aa5d8f5b2
26 changed files with 968 additions and 108 deletions
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17
src/machine/machine.c
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@@ -161,6 +161,16 @@ machine_available(int m)
}
void
pit_irq0_timer(int new_out, int old_out)
{
if (new_out && !old_out)
picint(1);
if (!new_out)
picintc(1);
}
void
machine_common_init(const machine_t *model)
{
@@ -168,5 +178,10 @@ machine_common_init(const machine_t *model)
pic_init();
dma_init();
pit_common_init(!!IS_AT(machine), pit_irq0_timer, NULL);
int pit_type = IS_AT(machine) ? PIT_8254 : PIT_8253;
/* Select fast PIT if needed */
if ((pit_mode == -1 && is486) || pit_mode == 1)
pit_type += 2;
pit_common_init(pit_type, pit_irq0_timer, NULL);
}