mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-27 11:15:39 +00:00
56 lines
1.0 KiB
Go
56 lines
1.0 KiB
Go
// Copyright 2018 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.
|
|
|
|
//+build !amd64,!amd64p32,!386
|
|
|
|
package cpu
|
|
|
|
import (
|
|
"io/ioutil"
|
|
)
|
|
|
|
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 init() {
|
|
buf, err := ioutil.ReadFile(procAuxv)
|
|
if err != nil {
|
|
panic("read proc auxv failed: " + err.Error())
|
|
}
|
|
|
|
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
|
|
}
|
|
}
|
|
doinit()
|
|
}
|