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b1e1602b1f
Fixes #42747 Change-Id: I6b1679348c77161f075f0678818bb003fc0e8c86 Reviewed-on: https://go-review.googlesource.com/c/go/+/271989 Trust: Martin Möhrmann <moehrmann@google.com> Run-TryBot: Martin Möhrmann <martisch@uos.de> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
34 lines
952 B
Go
34 lines
952 B
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build arm64
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// +build darwin
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// +build !ios
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package cpu
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func osInit() {
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ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00"))
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ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00"))
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// There are no hw.optional sysctl values for the below features on Mac OS 11.0
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// to detect their supported state dynamically. Assume the CPU features that
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// Apple Silicon M1 supports to be available as a minimal set of features
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// to all Go programs running on darwin/arm64.
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ARM64.HasAES = true
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ARM64.HasPMULL = true
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ARM64.HasSHA1 = true
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ARM64.HasSHA2 = true
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}
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//go:noescape
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func getsysctlbyname(name []byte) (int32, int32)
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func sysctlEnabled(name []byte) bool {
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ret, value := getsysctlbyname(name)
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if ret < 0 {
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return false
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}
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return value > 0
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}
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