// 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

package cpu

func osInit() {
	hwcapInit("android")

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build arm64 && linux && !android

package cpu

func osInit() {
	hwcapInit("linux")

	hwcap_AES     = 1 << 3
	hwcap_PMULL   = 1 << 4
	hwcap_SHA1    = 1 << 5
	hwcap_SHA2    = 1 << 6
	hwcap_CRC32   = 1 << 7
	hwcap_ATOMICS = 1 << 8
	hwcap_CPUID   = 1 << 11
	hwcap_SHA512  = 1 << 21
)

func hwcapInit(os string) {
	// HWCap was populated by the runtime from the auxiliary vector.
	// Use HWCap information since reading aarch64 system registers
	// is not supported in user space on older linux kernels.