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Documenting a bit in interrupts

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Elfein Landers 2022-08-06 20:43:23 -07:00
parent f0ca90ae25
commit 2bd5ffb4eb
1 changed files with 6 additions and 0 deletions
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6
ableos/src/arch/x86_64/interrupts.rs
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@ -177,11 +177,17 @@ pub fn init_idt() {
IDT.load(); IDT.load();
} }
/// https://wiki.osdev.org/Pit
///
const PIT_MAX_FREQ: u32 = 1193180; const PIT_MAX_FREQ: u32 = 1193180;
pub fn set_pit_frequency(pit: u16, freq: u32) { pub fn set_pit_frequency(pit: u16, freq: u32) {
// Dividing the maximum frequency by the desired frequency
// gives roughly what the maximum value for the timer
// counter should be to run at the desired frequency.
let ret = (PIT_MAX_FREQ / freq).try_into(); let ret = (PIT_MAX_FREQ / freq).try_into();
// Type-bounded counter maximum.
let divisor: u16 = match ret { let divisor: u16 = match ret {
Ok(div) => div, Ok(div) => div,
Err(err) => { Err(err) => {