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

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

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📄 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_arm.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

const CacheLinePadSize = 32

// arm doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
// These are initialized by archauxv() and should not be changed after they are
// initialized.
var HWCap uint
var HWCap2 uint
var Platform string

// HWCAP/HWCAP2 bits. These are exposed by Linux and FreeBSD.
const (
	hwcap_VFPv4 = 1 << 16
	hwcap_IDIVA = 1 << 17
	hwcap_LPAE  = 1 << 20
)

func doinit() {
	options = []option{
		{Name: "vfpv4", Feature: &ARM.HasVFPv4},
		{Name: "idiva", Feature: &ARM.HasIDIVA},
		{Name: "v7atomics", Feature: &ARM.HasV7Atomics},
	}

// HWCAP feature bits
	ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)
	ARM.HasIDIVA = isSet(HWCap, hwcap_IDIVA)
	// lpae is required to make the 64-bit instructions LDRD and STRD (and variants) atomic.
	// See ARMv7 manual section B1.6.
	// We also need at least a v7 chip, for the DMB instruction.
	ARM.HasV7Atomics = isSet(HWCap, hwcap_LPAE) && isV7(Platform)
}

func isSet(hwc uint, value uint) bool {
	return hwc&value != 0
}

func isV7(s string) bool {
	if s == "aarch64" {
		return true
	}
	return s >= "v7" // will be something like v5, v7, v8, v8l
}

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Editing: cpu_arm.go

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