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