| //! 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); |
| enable_feature(&mut value, Feature::pmull, auxv.hwcap2 & HWCAP2_PMULL != 0); |
| enable_feature(&mut value, Feature::crc, auxv.hwcap2 & HWCAP2_CRC32 != 0); |
| enable_feature(&mut value, Feature::aes, auxv.hwcap2 & HWCAP2_AES != 0); |
| // 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); |
| return value; |
| } |
| value |
| } |