github.com/mdaxf/iac@v0.0.0-20240519030858-58a061660378/vendor_skip/golang.org/x/sys/cpu/proc_cpuinfo_linux.go (about) 1 // Copyright 2022 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 //go:build linux && arm64 6 7 package cpu 8 9 import ( 10 "errors" 11 "io" 12 "os" 13 "strings" 14 ) 15 16 func readLinuxProcCPUInfo() error { 17 f, err := os.Open("/proc/cpuinfo") 18 if err != nil { 19 return err 20 } 21 defer f.Close() 22 23 var buf [1 << 10]byte // enough for first CPU 24 n, err := io.ReadFull(f, buf[:]) 25 if err != nil && err != io.ErrUnexpectedEOF { 26 return err 27 } 28 in := string(buf[:n]) 29 const features = "\nFeatures : " 30 i := strings.Index(in, features) 31 if i == -1 { 32 return errors.New("no CPU features found") 33 } 34 in = in[i+len(features):] 35 if i := strings.Index(in, "\n"); i != -1 { 36 in = in[:i] 37 } 38 m := map[string]*bool{} 39 40 initOptions() // need it early here; it's harmless to call twice 41 for _, o := range options { 42 m[o.Name] = o.Feature 43 } 44 // The EVTSTRM field has alias "evstrm" in Go, but Linux calls it "evtstrm". 45 m["evtstrm"] = &ARM64.HasEVTSTRM 46 47 for _, f := range strings.Fields(in) { 48 if p, ok := m[f]; ok { 49 *p = true 50 } 51 } 52 return nil 53 }