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Fix line endings to use LF (#1350)
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-73
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  • crates/std_detect/src/detect/os/linux

1 file changed

+73
-73
lines changed
+73-73
Original file line numberDiff line numberDiff line change
@@ -1,73 +1,73 @@
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//! Run-time feature detection for RISC-V on Linux.
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use super::auxvec;
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use crate::detect::{bit, cache, Feature};
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/// Read list of supported features from the auxiliary vector.
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pub(crate) 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, feature, enable| {
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if enable {
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value.set(feature as u32);
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}
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};
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let enable_features = |value: &mut cache::Initializer, feature_slice: &[Feature], enable| {
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if enable {
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for feature in feature_slice {
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value.set(*feature as u32);
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}
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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/riscv/include/asm/hwcap.h
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let auxv = auxvec::auxv().expect("read auxvec"); // should not fail on RISC-V platform
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enable_feature(
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&mut value,
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Feature::a,
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bit::test(auxv.hwcap, (b'a' - b'a').into()),
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);
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enable_feature(
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&mut value,
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Feature::c,
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bit::test(auxv.hwcap, (b'c' - b'a').into()),
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);
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enable_features(
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&mut value,
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&[Feature::d, Feature::f, Feature::zicsr],
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bit::test(auxv.hwcap, (b'd' - b'a').into()),
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);
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enable_features(
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&mut value,
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&[Feature::f, Feature::zicsr],
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bit::test(auxv.hwcap, (b'f' - b'a').into()),
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);
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let has_i = bit::test(auxv.hwcap, (b'i' - b'a').into());
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// If future RV128I is supported, implement with `enable_feature` here
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#[cfg(target_pointer_width = "64")]
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enable_feature(&mut value, Feature::rv64i, has_i);
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#[cfg(target_pointer_width = "32")]
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enable_feature(&mut value, Feature::rv32i, has_i);
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#[cfg(target_pointer_width = "32")]
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enable_feature(
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&mut value,
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Feature::rv32e,
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bit::test(auxv.hwcap, (b'e' - b'a').into()),
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);
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enable_feature(
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&mut value,
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Feature::h,
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bit::test(auxv.hwcap, (b'h' - b'a').into()),
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);
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enable_feature(
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&mut value,
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Feature::m,
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bit::test(auxv.hwcap, (b'm' - b'a').into()),
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);
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// FIXME: Auxvec does not show supervisor feature support, but this mode may be useful
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// to detect when Rust is used to write Linux kernel modules.
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// These should be more than Auxvec way to detect supervisor features.
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value
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}
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//! Run-time feature detection for RISC-V on Linux.
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use super::auxvec;
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use crate::detect::{bit, cache, Feature};
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/// Read list of supported features from the auxiliary vector.
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pub(crate) 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, feature, enable| {
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if enable {
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value.set(feature as u32);
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}
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};
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let enable_features = |value: &mut cache::Initializer, feature_slice: &[Feature], enable| {
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if enable {
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for feature in feature_slice {
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value.set(*feature as u32);
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}
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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/riscv/include/asm/hwcap.h
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let auxv = auxvec::auxv().expect("read auxvec"); // should not fail on RISC-V platform
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enable_feature(
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&mut value,
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Feature::a,
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bit::test(auxv.hwcap, (b'a' - b'a').into()),
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);
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enable_feature(
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&mut value,
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Feature::c,
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bit::test(auxv.hwcap, (b'c' - b'a').into()),
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);
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enable_features(
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&mut value,
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&[Feature::d, Feature::f, Feature::zicsr],
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bit::test(auxv.hwcap, (b'd' - b'a').into()),
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);
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enable_features(
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&mut value,
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&[Feature::f, Feature::zicsr],
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bit::test(auxv.hwcap, (b'f' - b'a').into()),
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);
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let has_i = bit::test(auxv.hwcap, (b'i' - b'a').into());
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// If future RV128I is supported, implement with `enable_feature` here
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#[cfg(target_pointer_width = "64")]
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enable_feature(&mut value, Feature::rv64i, has_i);
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#[cfg(target_pointer_width = "32")]
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enable_feature(&mut value, Feature::rv32i, has_i);
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#[cfg(target_pointer_width = "32")]
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enable_feature(
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&mut value,
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Feature::rv32e,
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bit::test(auxv.hwcap, (b'e' - b'a').into()),
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);
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enable_feature(
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&mut value,
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Feature::h,
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bit::test(auxv.hwcap, (b'h' - b'a').into()),
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);
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enable_feature(
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&mut value,
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Feature::m,
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bit::test(auxv.hwcap, (b'm' - b'a').into()),
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);
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// FIXME: Auxvec does not show supervisor feature support, but this mode may be useful
69+
// to detect when Rust is used to write Linux kernel modules.
70+
// These should be more than Auxvec way to detect supervisor features.
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value
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}

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