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feat: add fadt based lapic timer calibration

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This commit is contained in:
Katharina 2026-07-03 22:35:16 +02:00
parent 54d48e7d91
commit 61dfda6a70
7 changed files with 257 additions and 28 deletions
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13
kernel/include/apic/timer.h
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@ -1,6 +1,6 @@
#pragma once
#include "acpi/madt.h"
#include "acpi/discovery.h"
namespace apic {
@ -12,6 +12,11 @@ struct timestamp_t {
uint64_t timer_count;
};
struct seconds_nanoseconds_t {
uint64_t seconds;
uint64_t nanoseconds;
};
constexpr duration_t operator+(duration_t left, duration_t right) {
return duration_t{left.timer_count + right.timer_count};
}
@ -44,13 +49,17 @@ constexpr duration_t operator-(timestamp_t left, timestamp_t right) {
return duration_t{left.timer_count - right.timer_count};
}
bool calibrateTimer(const acpi::Madt& madt);
bool calibrateTimer(const acpi::discovery_result_t& discovery);
duration_t seconds(uint64_t count);
duration_t milliseconds(uint64_t count);
duration_t microseconds(uint64_t count);
duration_t nanoseconds(uint64_t count);
seconds_nanoseconds_t toSecondsAndNanoseconds(duration_t duration);
void busyWait(duration_t duration);
timestamp_t now();
// TODO: when dynamic allocation and lists are available