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//! Run-time feature detection for Aarch64 on Windows.
use crate::detect::{cache, Feature};
/// Try to read the features using IsProcessorFeaturePresent.
pub(crate) fn detect_features() -> cache::Initializer {
type DWORD = u32;
type BOOL = i32;
const FALSE: BOOL = 0;
// The following Microsoft documents isn't updated for aarch64.
// https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent
// These are defined in winnt.h of Windows SDK
const PF_ARM_NEON_INSTRUCTIONS_AVAILABLE: u32 = 19;
const PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE: u32 = 30;
const PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE: u32 = 31;
extern "system" {
pub fn IsProcessorFeaturePresent(ProcessorFeature: DWORD) -> BOOL;
}
let mut value = cache::Initializer::default();
{
let mut enable_feature = |f, enable| {
if enable {
value.set(f as u32);
}
};
// Some features such Feature::fp may be supported on current CPU,
// but no way to detect it by OS API.
// Also, we require unsafe block for the extern "system" calls.
unsafe {
enable_feature(
Feature::asimd,
IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != FALSE,
);
enable_feature(
Feature::crc,
IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE) != FALSE,
);
// PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE means aes, sha1, sha2 and
// pmull support
enable_feature(
Feature::aes,
IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
);
enable_feature(
Feature::pmull,
IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
);
enable_feature(
Feature::sha2,
IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
);
}
}
value
}
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