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//! Run-time feature detection for ARM on Linux.
use super::auxvec;
use crate::detect::{Feature, bit, cache};
/// Try to read the features from the auxiliary vector.
pub(crate) 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/arm/include/uapi/asm/hwcap.h
if let Ok(auxv) = auxvec::auxv() {
enable_feature(&mut value, Feature::i8mm, bit::test(auxv.hwcap, 27));
enable_feature(&mut value, Feature::dotprod, bit::test(auxv.hwcap, 24));
enable_feature(&mut value, Feature::neon, bit::test(auxv.hwcap, 12));
enable_feature(&mut value, Feature::pmull, bit::test(auxv.hwcap2, 1));
enable_feature(&mut value, Feature::crc, bit::test(auxv.hwcap2, 4));
enable_feature(&mut value, Feature::aes, bit::test(auxv.hwcap2, 0));
// SHA2 requires SHA1 & SHA2 features
enable_feature(
&mut value,
Feature::sha2,
bit::test(auxv.hwcap2, 2) && bit::test(auxv.hwcap2, 3),
);
return value;
}
value
}
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