os/
timer.rs

1//! RISC-V timer-related functionality
2
3use crate::config::CLOCK_FREQ;
4use crate::sbi::set_timer;
5use riscv::register::time;
6
7const TICKS_PER_SEC: usize = 100;
8const MSEC_PER_SEC: usize = 1000;
9///get current time
10pub fn get_time() -> usize {
11    time::read()
12}
13/// get current time in microseconds
14pub fn get_time_ms() -> usize {
15    time::read() / (CLOCK_FREQ / MSEC_PER_SEC)
16}
17/// set the next timer interrupt
18pub fn set_next_trigger() {
19    set_timer(get_time() + CLOCK_FREQ / TICKS_PER_SEC);
20}