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tsc: redo calibration, directly use hpet

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Matheus
2024-10-02 19:42:33 -03:00
parent e9b9242653
commit 65ef516fd8
3 changed files with 37 additions and 17 deletions
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kernel-src/arch/x86-64/hpet.c
+23
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@@ -4,6 +4,7 @@
#include <arch/hpet.h>
#include <kernel/vmm.h>
#include <kernel/interrupt.h>
#include <arch/tsc.h>
#include <uacpi/acpi.h>
#include <uacpi/tables.h>
@@ -165,6 +166,28 @@ time_t hpet_ticks(timekeeper_source_info_t *) {
}
}
time_t arch_hpet_calibrate_tsc(time_t ms_wait) {
if (hpet_private.hpet == NULL)
return 0;
long old_ipl = interrupt_raiseipl(IPL_TIMER - 1);
uint64_t capabilities = read64(HPET_REG_CAPS);
time_t ticks_to_wait = ms_wait * 1000000000000lu / HPET_CAP_FSPERTICK(capabilities);
time_t tsc_tick_start = rdtsc_serialized();
time_t tsc_tick_end;
time_t ticks_target = hpet_ticks(&timekeeper_source_info) + ticks_to_wait;
do {
tsc_tick_end = rdtsc_serialized();
} while (hpet_ticks(&timekeeper_source_info) < ticks_target);
interrupt_loweripl(old_ipl);
return (tsc_tick_end - tsc_tick_start) / ms_wait;
}
TIMEKEEPER_SOURCE(
hpet_source,
.name = "HPET",