forked from gitea/gitea
145 lines
2.5 KiB
Go
145 lines
2.5 KiB
Go
// Copyright 2019 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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package cpu
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import "runtime"
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const cacheLineSize = 64
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func init() {
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switch runtime.GOOS {
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case "android", "darwin", "netbsd":
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// Android and iOS don't seem to allow reading these registers.
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//
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// NetBSD:
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// ID_AA64ISAR0_EL1 is a privileged register and cannot be read from EL0.
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// It can be read via sysctl(3). Example for future implementers:
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// https://nxr.netbsd.org/xref/src/usr.sbin/cpuctl/arch/aarch64.c
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//
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// Fake the minimal features expected by
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// TestARM64minimalFeatures.
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ARM64.HasASIMD = true
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ARM64.HasFP = true
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case "linux":
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doinit()
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default:
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readARM64Registers()
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}
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}
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func readARM64Registers() {
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Initialized = true
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// ID_AA64ISAR0_EL1
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isar0 := getisar0()
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switch extractBits(isar0, 4, 7) {
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case 1:
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ARM64.HasAES = true
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case 2:
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ARM64.HasAES = true
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ARM64.HasPMULL = true
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}
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switch extractBits(isar0, 8, 11) {
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case 1:
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ARM64.HasSHA1 = true
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}
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switch extractBits(isar0, 12, 15) {
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case 1:
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ARM64.HasSHA2 = true
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case 2:
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ARM64.HasSHA2 = true
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ARM64.HasSHA512 = true
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}
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switch extractBits(isar0, 16, 19) {
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case 1:
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ARM64.HasCRC32 = true
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}
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switch extractBits(isar0, 20, 23) {
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case 2:
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ARM64.HasATOMICS = true
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}
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switch extractBits(isar0, 28, 31) {
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case 1:
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ARM64.HasASIMDRDM = true
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}
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switch extractBits(isar0, 32, 35) {
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case 1:
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ARM64.HasSHA3 = true
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}
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switch extractBits(isar0, 36, 39) {
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case 1:
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ARM64.HasSM3 = true
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}
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switch extractBits(isar0, 40, 43) {
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case 1:
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ARM64.HasSM4 = true
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}
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switch extractBits(isar0, 44, 47) {
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case 1:
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ARM64.HasASIMDDP = true
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}
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// ID_AA64ISAR1_EL1
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isar1 := getisar1()
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switch extractBits(isar1, 0, 3) {
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case 1:
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ARM64.HasDCPOP = true
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}
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switch extractBits(isar1, 12, 15) {
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case 1:
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ARM64.HasJSCVT = true
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}
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switch extractBits(isar1, 16, 19) {
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case 1:
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ARM64.HasFCMA = true
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}
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switch extractBits(isar1, 20, 23) {
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case 1:
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ARM64.HasLRCPC = true
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}
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// ID_AA64PFR0_EL1
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pfr0 := getpfr0()
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switch extractBits(pfr0, 16, 19) {
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case 0:
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ARM64.HasFP = true
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case 1:
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ARM64.HasFP = true
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ARM64.HasFPHP = true
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}
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switch extractBits(pfr0, 20, 23) {
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case 0:
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ARM64.HasASIMD = true
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case 1:
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ARM64.HasASIMD = true
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ARM64.HasASIMDHP = true
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}
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switch extractBits(pfr0, 32, 35) {
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case 1:
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ARM64.HasSVE = true
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}
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}
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func extractBits(data uint64, start, end uint) uint {
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return (uint)(data>>start) & ((1 << (end - start + 1)) - 1)
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}
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