32 lines
976 B
Rust
32 lines
976 B
Rust
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//! Run-time feature detection for MIPS on Linux.
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use super::auxvec;
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use crate::detect::{bit, 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, and if that fails, try
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/// to read them from `/proc/cpuinfo`.
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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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// The values are part of the platform-specific [asm/hwcap.h][hwcap]
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//
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// [hwcap]: https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h
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if let Ok(auxv) = auxvec::auxv() {
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enable_feature(&mut value, Feature::msa, bit::test(auxv.hwcap, 1));
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return value;
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}
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// TODO: fall back via `cpuinfo`.
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value
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}
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