28 lines
780 B
Rust
28 lines
780 B
Rust
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//! Run-time feature detection for ARM on FreeBSD
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use super::auxvec;
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use crate::detect::{cache, Feature};
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/// Performs run-time feature detection.
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#[inline]
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pub fn check_for(x: Feature) -> bool {
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cache::test(x as u32, detect_features)
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}
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/// Try to read the features from the auxiliary vector
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fn detect_features() -> cache::Initializer {
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let mut value = cache::Initializer::default();
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let enable_feature = |value: &mut cache::Initializer, f, enable| {
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if enable {
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value.set(f as u32);
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}
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};
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if let Ok(auxv) = auxvec::auxv() {
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enable_feature(&mut value, Feature::neon, auxv.hwcap & 0x00001000 != 0);
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enable_feature(&mut value, Feature::pmull, auxv.hwcap2 & 0x00000002 != 0);
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return value;
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}
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value
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}
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