You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hwcap_linux.go
    path of file: ./repos/goHackTools/vendor/golang.org/x/sys/cpu
    
    the code of the file until where you have to start completion: // Copyright 2019 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

import (
	"os"
)

const (
	_AT_HWCAP  = 16
	_AT_HWCAP2 = 26

	procAuxv = "/proc/self/auxv"

	uintSize = int(32 << (^uint(0) >> 63))
)

// For those platforms don't have a 'cpuid' equivalent we use HWCAP/HWCAP2
// These are initialized in cpu_$GOARCH.go
// and should not be changed after they are initialized.
var hwCap uint
var hwCap2 uint

func readHWCAP() error {
	// For Go 1.21+, get auxv from the Go runtime.
	if a := getAuxv(); len(a) > 0 {
		for len(a) >= 2 {
			tag, val := a[0], uint(a[1])
			a = a[2:]
			switch tag {
			case _AT_HWCAP:
				hwCap = val
			case _AT_HWCAP2:
				hwCap2 = val
			}
		}
		return nil
	}

	buf, err := os.ReadFile(procAuxv)
	if err != nil {
		// e.g. on android /proc/self/aux
    
func readHWCAP() error {
	// For Go 1.21+, get auxv from the Go runtime.
	if a := getAuxv(); len(a) > 0 {
		for len(a) >= 2 {
			tag, val := a[0], uint(a[1])
			a = a[2:]
			switch tag {
			case _AT_HWCAP:
				hwCap = val
			case _AT_HWCAP2:
				hwCap2 = val
			}
		}
		return nil
	}

	buf, err := os.ReadFile(procAuxv)
	if err != nil {
		// e.g. on android /proc/self/auxv is not accessible, so silently
		// ignore the error and leave Initialized = false. On some
		// architectures (e.g. arm64) doinit() implements a fallback
		// readout and will set Initialized = true again.
		return err
	}
	bo := hostByteOrder()
	for len(buf) >= 2*(uintSize/8) {
		var tag, val uint
		switch uintSize {
		case 32:
			tag = uint(bo.Uint32(buf[0:]))
			val = uint(bo.Uint32(buf[4:]))
			buf = buf[8:]
		case 64:
			tag = uint(bo.Uint64(buf[0:]))
			val = uint(bo.Uint64(buf[8:]))
			buf = buf[16:]
		}
		switch tag {
		case _AT_HWCAP:
			hwCap = val
		case _AT_HWCAP2:
			hwCap2 = val
		}
	}
	return nil
}