kernel/arch/riscv64/
fdt.rs

1use crate::device::fdt::FdtManager;
2
3/// Read the RISC-V timebase frequency (Hz) from the device tree.
4///
5/// The standard location is the `/cpus` node property `timebase-frequency`.
6/// Returns `None` if FDT is unavailable or the property is missing/invalid.
7pub fn timebase_frequency_hz_from_fdt() -> Option<u64> {
8    let fdt = FdtManager::get_manager().get_fdt()?;
9    let cpus = fdt.find_node("/cpus")?;
10
11    let prop = cpus.property("timebase-frequency")?;
12    match prop.value.len() {
13        4 => Some(u32::from_be_bytes(prop.value[0..4].try_into().unwrap()) as u64),
14        8 => Some(u64::from_be_bytes(prop.value[0..8].try_into().unwrap())),
15        _ => None,
16    }
17}

kernel/arch/riscv64/fdt.rs

kernel/arch/riscv64/
fdt.rs