34 lines
853 B
Go
34 lines
853 B
Go
|
// Copyright 2017 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
|
||
|
|
|
||
|
|
// arm doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
|
||
|
|
// These are linknamed in runtime/os_(linux|freebsd)_arm.go and are
|
||
|
|
// initialized by archauxv().
|
||
|
|
// These should not be changed after they are initialized.
|
||
|
|
var HWCap uint
|
||
|
|
var HWCap2 uint
|
||
|
|
|
||
|
|
// HWCAP/HWCAP2 bits. These are exposed by Linux and FreeBSD.
|
||
|
|
const (
|
||
|
|
hwcap_VFPv4 = 1 << 16
|
||
|
|
hwcap_IDIVA = 1 << 17
|
||
|
|
)
|
||
|
|
|
||
|
|
func doinit() {
|
||
|
|
options = []option{
|
||
|
|
{Name: "vfpv4", Feature: &ARM.HasVFPv4},
|
||
|
|
{Name: "idiva", Feature: &ARM.HasIDIVA},
|
||
|
|
}
|
||
|
|
|
||
|
|
// HWCAP feature bits
|
||
|
|
ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)
|
||
|
|
ARM.HasIDIVA = isSet(HWCap, hwcap_IDIVA)
|
||
|
|
}
|
||
|
|
|
||
|
|
func isSet(hwc uint, value uint) bool {
|
||
|
|
return hwc&value != 0
|
||
|
|
}
|