| //! Run-time feature detection for ARM on FreeBSD |
| |
| use crate::detect::{Feature, cache}; |
| use super::{auxvec}; |
| |
| /// 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 |
| 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); |
| } |
| }; |
| |
| if let Ok(auxv) = auxvec::auxv() { |
| enable_feature(&mut value, Feature::neon, auxv.hwcap & 0x00001000 != 0); |
| enable_feature(&mut value, Feature::pmull, auxv.hwcap2 & 0x00000002 != 0); |
| return value; |
| } |
| value |
| } |
