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// Copyright 2022 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build arm64
// +build arm64
package atomicbitops
import (
"runtime"
"golang.org/x/sys/cpu"
"gvisor.dev/gvisor/pkg/cpuid"
)
var arm64HasATOMICS bool
func init() {
// The gvisor cpuid package only works on Linux.
// For all other operating systems, use Go's x/sys/cpu package
// to get the one bit we care about here.
//
// See https://github.com/google/gvisor/issues/7849.
if runtime.GOOS == "linux" {
arm64HasATOMICS = cpuid.HostFeatureSet().HasFeature(cpuid.ARM64FeatureATOMICS)
} else {
arm64HasATOMICS = cpu.ARM64.HasATOMICS
}
}
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