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//! Run-time feature detection for ARM on FreeBSD
use super::auxvec;
use crate::detect::{cache, Feature};
// Defined in machine/elf.h.
// https://github.com/freebsd/freebsd-src/blob/deb63adf945d446ed91a9d84124c71f15ae571d1/sys/arm/include/elf.h
const HWCAP_NEON: usize = 0x00001000;
const HWCAP2_AES: usize = 0x00000001;
const HWCAP2_PMULL: usize = 0x00000002;
const HWCAP2_SHA1: usize = 0x00000004;
const HWCAP2_SHA2: usize = 0x00000008;
const HWCAP2_CRC32: usize = 0x00000010;
/// 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);
}
};
if let Ok(auxv) = auxvec::auxv() {
enable_feature(&mut value, Feature::neon, auxv.hwcap & HWCAP_NEON != 0);
let pmull = auxv.hwcap2 & HWCAP2_PMULL != 0;
enable_feature(&mut value, Feature::pmull, pmull);
enable_feature(&mut value, Feature::crc, auxv.hwcap2 & HWCAP2_CRC32 != 0);
let aes = auxv.hwcap2 & HWCAP2_AES != 0;
enable_feature(&mut value, Feature::aes, aes);
// SHA2 requires SHA1 & SHA2 features
let sha1 = auxv.hwcap2 & HWCAP2_SHA1 != 0;
let sha2 = auxv.hwcap2 & HWCAP2_SHA2 != 0;
enable_feature(&mut value, Feature::sha2, sha1 && sha2);
enable_feature(&mut value, Feature::crypto, aes && pmull && sha1 && sha2);
return value;
}
value
}
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