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fix(platform/timer/x86_64): if frequency is zero, panic

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This commit is contained in:
Alex Zenla
2025-11-01 19:08:47 -04:00
parent 6b1d220490
commit 3b32f6c3ce
1 changed files with 8 additions and 4 deletions
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12
src/platform/timer/x86_64.rs
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@@ -50,17 +50,21 @@ pub fn stop() -> u64 {
}
/// Measure the frequency of the platform timer.
fn measure_frequency(duration: &Duration) -> u64 {
fn measure_frequency() -> u64 {
let start = start();
uefi::boot::stall(*duration);
uefi::boot::stall(MEASURE_FREQUENCY_DURATION);
let stop = stop();
let elapsed = stop.wrapping_sub(start) as f64;
(elapsed / duration.as_secs_f64()) as u64
(elapsed / MEASURE_FREQUENCY_DURATION.as_secs_f64()) as u64
}
/// Acquire the platform timer frequency.
/// On x86_64, this is slightly expensive, so it should be done once.
pub fn frequency() -> TickFrequency {
let frequency = measure_frequency(&MEASURE_FREQUENCY_DURATION);
let frequency = measure_frequency();
// If the frequency is 0, then something went very wrong and we should panic.
if frequency == 0 {
panic!("unable to measure frequency");
}
TickFrequency::Measured(frequency, MEASURE_FREQUENCY_DURATION)
}