1 files changed, 81 insertions, 0 deletions
diff --git a/vendor/portable-atomic/src/imp/atomic128/detect/aarch64_windows.rs b/vendor/portable-atomic/src/imp/atomic128/detect/aarch64_windows.rs
new file mode 100644
index 0000000..6ace866
--- /dev/null
+++ b/vendor/portable-atomic/src/imp/atomic128/detect/aarch64_windows.rs
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+// Run-time feature detection on aarch64 Windows by using IsProcessorFeaturePresent.
+//
+// As of nightly-2023-01-23, is_aarch64_feature_detected doesn't support run-time detection of FEAT_LSE on Windows.
+// https://github.com/rust-lang/stdarch/blob/a0c30f3e3c75adcd6ee7efc94014ebcead61c507/crates/std_detect/src/detect/os/windows/aarch64.rs
+// https://github.com/rust-lang/stdarch/pull/1373
+//
+// Refs: https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent
+
+include!("common.rs");
+
+// windows-sys requires Rust 1.56
+#[allow(clippy::upper_case_acronyms)]
+mod ffi {
+    pub(crate) type DWORD = u32;
+    pub(crate) type BOOL = i32;
+
+    pub(crate) const FALSE: BOOL = 0;
+    // Defined in winnt.h of Windows SDK.
+    pub(crate) const PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE: DWORD = 34;
+
+    extern "system" {
+        // https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent
+        pub(crate) fn IsProcessorFeaturePresent(ProcessorFeature: DWORD) -> BOOL;
+    }
+}
+
+#[cold]
+fn _detect(info: &mut CpuInfo) {
+    // SAFETY: calling IsProcessorFeaturePresent is safe, and FALSE is also
+    // returned if the HAL does not support detection of the specified feature.
+    if unsafe {
+        ffi::IsProcessorFeaturePresent(ffi::PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE) != ffi::FALSE
+    } {
+        info.set(CpuInfo::HAS_LSE);
+    }
+}
+
+#[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::*;
+
+    // Static assertions for FFI bindings.
+    // This checks that FFI bindings defined in this crate and FFI bindings defined
+    // in windows-sys 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.
+    // (Unlike libc, windows-sys programmatically generates bindings from Windows
+    // API metadata, so it should be enough to check compatibility with the
+    // windows-sys' signatures/values.)
+    // 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::windows_sys;
+        let _: ffi::DWORD = 0 as windows_sys::Win32::System::Threading::PROCESSOR_FEATURE_ID;
+        let _: ffi::BOOL = 0 as windows_sys::Win32::Foundation::BOOL;
+        let mut _sysctl: unsafe extern "system" fn(ffi::DWORD) -> ffi::BOOL =
+            ffi::IsProcessorFeaturePresent;
+        _sysctl = windows_sys::Win32::System::Threading::IsProcessorFeaturePresent;
+        static_assert!(ffi::FALSE == windows_sys::Win32::Foundation::FALSE);
+        static_assert!(
+            ffi::PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE
+                == windows_sys::Win32::System::Threading::PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE
+        );
+    };
+}