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- // Copyright 2022 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.
-
- //go:build linux && arm64
-
- package cpu
-
- import (
- "errors"
- "io"
- "os"
- "strings"
- )
-
- func readLinuxProcCPUInfo() error {
- f, err := os.Open("/proc/cpuinfo")
- if err != nil {
- return err
- }
- defer f.Close()
-
- var buf [1 << 10]byte // enough for first CPU
- n, err := io.ReadFull(f, buf[:])
- if err != nil && err != io.ErrUnexpectedEOF {
- return err
- }
- in := string(buf[:n])
- const features = "\nFeatures : "
- i := strings.Index(in, features)
- if i == -1 {
- return errors.New("no CPU features found")
- }
- in = in[i+len(features):]
- if i := strings.Index(in, "\n"); i != -1 {
- in = in[:i]
- }
- m := map[string]*bool{}
-
- initOptions() // need it early here; it's harmless to call twice
- for _, o := range options {
- m[o.Name] = o.Feature
- }
- // The EVTSTRM field has alias "evstrm" in Go, but Linux calls it "evtstrm".
- m["evtstrm"] = &ARM64.HasEVTSTRM
-
- for _, f := range strings.Fields(in) {
- if p, ok := m[f]; ok {
- *p = true
- }
- }
- return nil
- }
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