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timekeeper: ticks_per_us (mhz) -> hz

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Matheus
2024-10-02 21:46:31 -03:00
parent a64b32e1aa
commit 8232f34493
5 changed files with 35 additions and 30 deletions
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kernel-src/arch/x86-64/tsc.c
+8 -6
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@@ -21,7 +21,9 @@ static bool tsc_probe(void) {
}
static MUTEX_DEFINE(init_mutex);
static time_t ticks_per_us;
// keeping this here in a multisocket machine could possibly result in completely wrong
// tsc measurements for the other sokets. disable the tsc in these using the "notsc" commandline option.
static time_t hz;
static timekeeper_source_info_t *tsc_init(void) {
MUTEX_ACQUIRE(&init_mutex, false);
@@ -32,7 +34,7 @@ static timekeeper_source_info_t *tsc_init(void) {
timekeeper_source_info->private = current_cpu();
if (ticks_per_us)
if (hz)
goto leave;
bool need_calibration = false;
@@ -50,17 +52,17 @@ static timekeeper_source_info_t *tsc_init(void) {
uint64_t core_denominator = cpuid_results.eax;
uint64_t tsc_frequency = core_frequency * core_numerator / core_denominator;
ticks_per_us = tsc_frequency / 1000000;
hz = tsc_frequency;
}
calibrate:
if (need_calibration) {
ticks_per_us = arch_hpet_calibrate_tsc(200) / 1000;
__assert(ticks_per_us);
hz = arch_hpet_calibrate_tsc(200) * 1000;
__assert(hz);
}
leave:
timekeeper_source_info->ticks_per_us = ticks_per_us;
timekeeper_source_info->hz = hz;
MUTEX_RELEASE(&init_mutex);
return timekeeper_source_info;
}