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detect: Support run-time detection on AArch64 illumos
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| // SPDX-License-Identifier: Apache-2.0 OR MIT | ||
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| /* | ||
| Run-time CPU feature detection on AArch64 illumos by using getisax. | ||
| As of nightly-2024-09-07, is_aarch64_feature_detected doesn't support run-time detection on illumos. | ||
| https://github.com/rust-lang/stdarch/blob/d9466edb4c53cece8686ee6e17b028436ddf4151/crates/std_detect/src/detect/mod.rs | ||
| Run-time detection on AArch64 illumos is currently disabled by default as AArch64 port is experimental. | ||
| */ | ||
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| include!("common.rs"); | ||
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| // core::ffi::c_* (except c_void) requires Rust 1.64, libc will soon require Rust 1.47 | ||
| #[allow(non_camel_case_types)] | ||
| mod ffi { | ||
| pub(crate) use super::c_types::c_uint; | ||
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| // Defined in sys/auxv_aarch64.h. | ||
| // https://github.com/richlowe/illumos-gate/blob/arm64-gate/usr/src/uts/common/sys/auxv_aarch64.h | ||
| pub(crate) const AV_AARCH64_LSE: u32 = 1 << 15; | ||
| pub(crate) const AV_AARCH64_2_LSE2: u32 = 1 << 2; | ||
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| extern "C" { | ||
| // Defined in sys/auxv.h. | ||
| // https://illumos.org/man/2/getisax | ||
| // https://github.com/richlowe/illumos-gate/blob/arm64-gate/usr/src/uts/common/sys/auxv.h | ||
| pub(crate) fn getisax(array: *mut u32, n: c_uint) -> c_uint; | ||
| } | ||
| } | ||
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| #[cold] | ||
| fn _detect(info: &mut CpuInfo) { | ||
| let mut out = [0_u32; 2]; | ||
| // SAFETY: the pointer is valid because we got it from a reference. | ||
| unsafe { | ||
| ffi::getisax(out.as_mut_ptr(), 2); | ||
| } | ||
| if out[0] & ffi::AV_AARCH64_LSE != 0 { | ||
| info.set(CpuInfo::HAS_LSE); | ||
| } | ||
| if out[1] & ffi::AV_AARCH64_2_LSE2 != 0 { | ||
| info.set(CpuInfo::HAS_LSE2); | ||
| } | ||
| } | ||
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| #[allow( | ||
| clippy::alloc_instead_of_core, | ||
| clippy::std_instead_of_alloc, | ||
| clippy::std_instead_of_core, | ||
| clippy::undocumented_unsafe_blocks, | ||
| clippy::wildcard_imports | ||
| )] | ||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
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| // Static assertions for FFI bindings. | ||
| // This checks that FFI bindings defined in this crate and FFI bindings | ||
| // generated for the platform's latest header file using bindgen have | ||
| // compatible signatures (or the same values if constants). | ||
| // Since this is static assertion, we can detect problems with | ||
| // `cargo check --tests --target <target>` run in CI (via TESTS=1 build.sh) | ||
| // without actually running tests on these platforms. | ||
| // See also tools/codegen/src/ffi.rs. | ||
| // TODO(codegen): auto-generate this test | ||
| #[allow( | ||
| clippy::cast_possible_wrap, | ||
| clippy::cast_sign_loss, | ||
| clippy::cast_possible_truncation, | ||
| clippy::no_effect_underscore_binding | ||
| )] | ||
| const _: fn() = || { | ||
| use test_helper::sys; | ||
| let mut _getisax: unsafe extern "C" fn(*mut u32, ffi::c_uint) -> ffi::c_uint = ffi::getisax; | ||
| _getisax = sys::getisax; | ||
| // static_assert!(ffi::AV_AARCH64_LSE == libc::AV_AARCH64_LSE); | ||
| static_assert!(ffi::AV_AARCH64_LSE == sys::AV_AARCH64_LSE); | ||
| // static_assert!(ffi::AV_AARCH64_2_LSE2 == libc::AV_AARCH64_2_LSE2); | ||
| static_assert!(ffi::AV_AARCH64_2_LSE2 == sys::AV_AARCH64_2_LSE2); | ||
| }; | ||
| } |
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