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// Copyright 2017 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.
// +build arm64
package cpu
const CacheLineSize = 64
// arm64 doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
// These are linknamed in runtime/os_linux_arm64.go and are initialized by
// archauxv().
var arm64_hwcap uint
var arm64_hwcap2 uint
// HWCAP/HWCAP2 bits. These are exposed by Linux.
const (
_ARM64_FEATURE_HAS_FP = (1 << 0)
_ARM64_FEATURE_HAS_ASIMD = (1 << 1)
_ARM64_FEATURE_HAS_EVTSTRM = (1 << 2)
_ARM64_FEATURE_HAS_AES = (1 << 3)
_ARM64_FEATURE_HAS_PMULL = (1 << 4)
_ARM64_FEATURE_HAS_SHA1 = (1 << 5)
_ARM64_FEATURE_HAS_SHA2 = (1 << 6)
_ARM64_FEATURE_HAS_CRC32 = (1 << 7)
_ARM64_FEATURE_HAS_ATOMICS = (1 << 8)
)
func init() {
// HWCAP feature bits
ARM64.HasFP = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_FP)
ARM64.HasASIMD = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_ASIMD)
ARM64.HasEVTSTRM = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_EVTSTRM)
ARM64.HasAES = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_AES)
ARM64.HasPMULL = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_PMULL)
ARM64.HasSHA1 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_SHA1)
ARM64.HasSHA2 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_SHA2)
ARM64.HasCRC32 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_CRC32)
ARM64.HasATOMICS = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_ATOMICS)
}
func isSet(hwc uint, value uint) bool {
return hwc&value != 0
}
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