32 lines
976 B
Rust
32 lines
976 B
Rust
//! Run-time feature detection for MIPS on Linux.
|
|
|
|
use super::auxvec;
|
|
use crate::detect::{bit, cache, Feature};
|
|
|
|
/// Performs run-time feature detection.
|
|
#[inline]
|
|
pub fn check_for(x: Feature) -> bool {
|
|
cache::test(x as u32, detect_features)
|
|
}
|
|
|
|
/// Try to read the features from the auxiliary vector, and if that fails, try
|
|
/// to read them from `/proc/cpuinfo`.
|
|
fn detect_features() -> cache::Initializer {
|
|
let mut value = cache::Initializer::default();
|
|
let enable_feature = |value: &mut cache::Initializer, f, enable| {
|
|
if enable {
|
|
value.set(f as u32);
|
|
}
|
|
};
|
|
|
|
// The values are part of the platform-specific [asm/hwcap.h][hwcap]
|
|
//
|
|
// [hwcap]: https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h
|
|
if let Ok(auxv) = auxvec::auxv() {
|
|
enable_feature(&mut value, Feature::msa, bit::test(auxv.hwcap, 1));
|
|
return value;
|
|
}
|
|
// TODO: fall back via `cpuinfo`.
|
|
value
|
|
}
|