kernel/devices/clock/hardware_timer/
mod.rs

1//! Hardware Timer
2//!
3//! Timer drivers for components that act as timers/clocks
4//! This includes the High Precision Event Timer (HPET) and Programmable Interval Timer (PIT).
5
6use alloc::sync::Arc;
7use hpet::Hpet;
8use pit::Pit;
9use tracing::warn;
10
11use crate::{acpi, cmdline, sync::spin::mutex::Mutex};
12
13use super::ClockDevice;
14
15mod hpet;
16mod pit;
17
18pub enum HardwareTimer {
19    Hpet(Arc<Mutex<Hpet>>),
20    Pit(Arc<Pit>),
21}
22impl HardwareTimer {
23    pub fn init(hpet_table: Option<&acpi::tables::Hpet>) -> Arc<dyn ClockDevice> {
24        Arc::new(match hpet_table {
25            Some(hpet_table) if cmdline::cmdline().allow_hpet => {
26                HardwareTimer::Hpet(hpet::init(hpet_table))
27            }
28            Some(_) => HardwareTimer::Pit(pit::init()),
29            None => {
30                warn!("HPET clock not found, falling back to PIT");
31                HardwareTimer::Pit(pit::init())
32            }
33        })
34    }
35}
36
37impl ClockDevice for HardwareTimer {
38    fn name(&self) -> &'static str {
39        match self {
40            HardwareTimer::Hpet(t) => t.name(),
41            HardwareTimer::Pit(t) => t.name(),
42        }
43    }
44
45    fn get_time(&self) -> super::ClockTime {
46        match self {
47            HardwareTimer::Hpet(t) => t.get_time(),
48            HardwareTimer::Pit(t) => t.get_time(),
49        }
50    }
51
52    fn granularity(&self) -> u64 {
53        match self {
54            HardwareTimer::Hpet(t) => t.granularity(),
55            HardwareTimer::Pit(t) => t.granularity(),
56        }
57    }
58
59    fn require_calibration(&self) -> bool {
60        match self {
61            HardwareTimer::Hpet(t) => t.require_calibration(),
62            HardwareTimer::Pit(t) => t.require_calibration(),
63        }
64    }
65
66    fn rating(&self) -> u64 {
67        match self {
68            HardwareTimer::Hpet(t) => t.rating(),
69            HardwareTimer::Pit(t) => t.rating(),
70        }
71    }
72}
kernel/devices/clock/hardware_timer/mod.rs

kernel/devices/clock/hardware_timer/
mod.rs
