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cpu: fix build for GOARCH=arm64 on GOOS!=linux

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The current implementation for arm64 only supports linux (through HWCaps
read from /proc/self/auxv) and fails to build e.g. on darwin/arm64.

Fixes golang/go#30237

Change-Id: I9f32a285760795441a829b0a81b2d5aff04e2dc4
Reviewed-on: https://go-review.googlesource.com/c/162797
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Tobias Klauser
2019-02-14 22:28:15 +01:00
committed by Tobias Klauser
parent 983097b1a8
commit e77772198c
2 changed files with 11 additions and 0 deletions
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67
cpu/cpu_linux_arm64.go Normal file
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@@ -0,0 +1,67 @@
// Copyright 2018 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.
package cpu
const cacheLineSize = 64
// HWCAP/HWCAP2 bits. These are exposed by Linux.
const (
hwcap_FP = 1 << 0
hwcap_ASIMD = 1 << 1
hwcap_EVTSTRM = 1 << 2
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_FPHP = 1 << 9
hwcap_ASIMDHP = 1 << 10
hwcap_CPUID = 1 << 11
hwcap_ASIMDRDM = 1 << 12
hwcap_JSCVT = 1 << 13
hwcap_FCMA = 1 << 14
hwcap_LRCPC = 1 << 15
hwcap_DCPOP = 1 << 16
hwcap_SHA3 = 1 << 17
hwcap_SM3 = 1 << 18
hwcap_SM4 = 1 << 19
hwcap_ASIMDDP = 1 << 20
hwcap_SHA512 = 1 << 21
hwcap_SVE = 1 << 22
hwcap_ASIMDFHM = 1 << 23
)
func doinit() {
// HWCAP feature bits
ARM64.HasFP = isSet(HWCap, hwcap_FP)
ARM64.HasASIMD = isSet(HWCap, hwcap_ASIMD)
ARM64.HasEVTSTRM = isSet(HWCap, hwcap_EVTSTRM)
ARM64.HasAES = isSet(HWCap, hwcap_AES)
ARM64.HasPMULL = isSet(HWCap, hwcap_PMULL)
ARM64.HasSHA1 = isSet(HWCap, hwcap_SHA1)
ARM64.HasSHA2 = isSet(HWCap, hwcap_SHA2)
ARM64.HasCRC32 = isSet(HWCap, hwcap_CRC32)
ARM64.HasATOMICS = isSet(HWCap, hwcap_ATOMICS)
ARM64.HasFPHP = isSet(HWCap, hwcap_FPHP)
ARM64.HasASIMDHP = isSet(HWCap, hwcap_ASIMDHP)
ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
ARM64.HasASIMDRDM = isSet(HWCap, hwcap_ASIMDRDM)
ARM64.HasJSCVT = isSet(HWCap, hwcap_JSCVT)
ARM64.HasFCMA = isSet(HWCap, hwcap_FCMA)
ARM64.HasLRCPC = isSet(HWCap, hwcap_LRCPC)
ARM64.HasDCPOP = isSet(HWCap, hwcap_DCPOP)
ARM64.HasSHA3 = isSet(HWCap, hwcap_SHA3)
ARM64.HasSM3 = isSet(HWCap, hwcap_SM3)
ARM64.HasSM4 = isSet(HWCap, hwcap_SM4)
ARM64.HasASIMDDP = isSet(HWCap, hwcap_ASIMDDP)
ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)
ARM64.HasSVE = isSet(HWCap, hwcap_SVE)
ARM64.HasASIMDFHM = isSet(HWCap, hwcap_ASIMDFHM)
}
func isSet(hwc uint, value uint) bool {
return hwc&value != 0
}