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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /library/stdarch/crates/std_detect/src/detect/os/linux/powerpc.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | library/stdarch/crates/std_detect/src/detect/os/linux/powerpc.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/library/stdarch/crates/std_detect/src/detect/os/linux/powerpc.rs b/library/stdarch/crates/std_detect/src/detect/os/linux/powerpc.rs new file mode 100644 index 000000000..c3308e815 --- /dev/null +++ b/library/stdarch/crates/std_detect/src/detect/os/linux/powerpc.rs @@ -0,0 +1,36 @@ +//! Run-time feature detection for PowerPC on Linux. + +use super::auxvec; +use crate::detect::{cache, Feature}; + +/// Try to read the features from the auxiliary vector, and if that fails, try +/// to read them from /proc/cpuinfo. +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); + } + }; + + // The values are part of the platform-specific [asm/cputable.h][cputable] + // + // [cputable]: https://github.com/torvalds/linux/blob/master/arch/powerpc/include/uapi/asm/cputable.h + if let Ok(auxv) = auxvec::auxv() { + // note: the PowerPC values are the mask to do the test (instead of the + // index of the bit to test like in ARM and Aarch64) + enable_feature(&mut value, Feature::altivec, auxv.hwcap & 0x10000000 != 0); + enable_feature(&mut value, Feature::vsx, auxv.hwcap & 0x00000080 != 0); + enable_feature(&mut value, Feature::power8, auxv.hwcap2 & 0x80000000 != 0); + return value; + } + + // PowerPC's /proc/cpuinfo lacks a proper Feature field, + // but `altivec` support is indicated in the `cpu` field. + #[cfg(feature = "std_detect_file_io")] + if let Ok(c) = super::cpuinfo::CpuInfo::new() { + enable_feature(&mut value, Feature::altivec, c.field("cpu").has("altivec")); + return value; + } + value +} |