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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build arm64 && darwin && !ios
package cpu
func osInit() {
ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00"))
ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00"))
ARM64.HasSHA512 = sysctlEnabled([]byte("hw.optional.armv8_2_sha512\x00"))
// There are no hw.optional sysctl values for the below features on Mac OS 11.0
// to detect their supported state dynamically. Assume the CPU features that
// Apple Silicon M1 supports to be available as a minimal set of features
// to all Go programs running on darwin/arm64.
ARM64.HasAES = true
ARM64.HasPMULL = true
ARM64.HasSHA1 = true
ARM64.HasSHA2 = true
}
//go:noescape
func getsysctlbyname(name []byte) (int32, int32)
func sysctlEnabled(name []byte) bool {
ret, value := getsysctlbyname(name)
if ret < 0 {
return false
}
return value > 0
}