435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
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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