mirror of
https://github.com/golang/sys.git
synced 2026-01-29 15:12:09 +03:00
1bfbee0e20
Done with: go get go@1.18 go mod tidy go fix ./... Using go1.21.3. Also update code generators to use only the new go:build lines, not the old +build ones. For golang/go#60268. Change-Id: I6aabc42efb6ab3329981100e1db2263aac5e92a6 Reviewed-on: https://go-review.googlesource.com/c/sys/+/534222 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
// 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
|
|
}
|