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Current Path: /opt/golang/1.22.0/src/internal/cpu

opt / golang / 1.22.0 / src / internal / cpu /

📁 ..
📄 cpu.go(6.85 KB)
📄 cpu.s(276 B)
📄 cpu_arm.go(1.26 KB)
📄 cpu_arm64.go(1.64 KB)
📄 cpu_arm64.s(439 B)
📄 cpu_arm64_android.go(231 B)
📄 cpu_arm64_darwin.go(1014 B)
📄 cpu_arm64_freebsd.go(322 B)
📄 cpu_arm64_hwcap.go(2.15 KB)
📄 cpu_arm64_linux.go(250 B)
📄 cpu_arm64_openbsd.go(574 B)
📄 cpu_arm64_other.go(466 B)
📄 cpu_loong64.go(398 B)
📄 cpu_mips.go(220 B)
📄 cpu_mips64x.go(671 B)
📄 cpu_mipsle.go(220 B)
📄 cpu_no_name.go(620 B)
📄 cpu_ppc64x.go(651 B)
📄 cpu_ppc64x_aix.go(603 B)
📄 cpu_ppc64x_linux.go(885 B)
📄 cpu_ppc64x_other.go(423 B)
📄 cpu_riscv64.go(220 B)
📄 cpu_s390x.go(5.88 KB)
📄 cpu_s390x.s(2.2 KB)
📄 cpu_s390x_test.go(1.43 KB)
📄 cpu_test.go(1.4 KB)
📄 cpu_wasm.go(220 B)
📄 cpu_x86.go(5.81 KB)
📄 cpu_x86.s(831 B)
📄 cpu_x86_test.go(1.37 KB)
📄 export_test.go(200 B)
📄 export_x86_test.go(241 B)

Editing: cpu_arm64.go

// 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.

package cpu

// CacheLinePadSize is used to prevent false sharing of cache lines.
// We choose 128 because Apple Silicon, a.k.a. M1, has 128-byte cache line size.
// It doesn't cost much and is much more future-proof.
const CacheLinePadSize = 128

func doinit() {
	options = []option{
		{Name: "aes", Feature: &ARM64.HasAES},
		{Name: "pmull", Feature: &ARM64.HasPMULL},
		{Name: "sha1", Feature: &ARM64.HasSHA1},
		{Name: "sha2", Feature: &ARM64.HasSHA2},
		{Name: "sha512", Feature: &ARM64.HasSHA512},
		{Name: "crc32", Feature: &ARM64.HasCRC32},
		{Name: "atomics", Feature: &ARM64.HasATOMICS},
		{Name: "cpuid", Feature: &ARM64.HasCPUID},
		{Name: "isNeoverse", Feature: &ARM64.IsNeoverse},
	}

// arm64 uses different ways to detect CPU features at runtime depending on the operating system.
	osInit()
}

func getisar0() uint64

func getMIDR() uint64

func extractBits(data uint64, start, end uint) uint {
	return (uint)(data>>start) & ((1 << (end - start + 1)) - 1)
}

func parseARM64SystemRegisters(isar0 uint64) {
	// ID_AA64ISAR0_EL1
	switch extractBits(isar0, 4, 7) {
	case 1:
		ARM64.HasAES = true
	case 2:
		ARM64.HasAES = true
		ARM64.HasPMULL = true
	}

switch extractBits(isar0, 8, 11) {
	case 1:
		ARM64.HasSHA1 = true
	}

switch extractBits(isar0, 12, 15) {
	case 1:
		ARM64.HasSHA2 = true
	case 2:
		ARM64.HasSHA2 = true
		ARM64.HasSHA512 = true
	}

switch extractBits(isar0, 16, 19) {
	case 1:
		ARM64.HasCRC32 = true
	}

switch extractBits(isar0, 20, 23) {
	case 2:
		ARM64.HasATOMICS = true
	}
}

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Editing: cpu_arm64.go

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