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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 arm64
package cpu
const (
// From OpenBSD's sys/sysctl.h.
_CTL_MACHDEP = 7
// From OpenBSD's machine/cpu.h.
_CPU_ID_AA64ISAR0 = 2
_CPU_ID_AA64ISAR1 = 3
_CPU_ID_AA64PFR0 = 8
)
//go:noescape
func sysctlUint64(mib []uint32) (uint64, bool)
func osInit() {
// Get ID_AA64ISAR0 from sysctl.
isar0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR0})
if !ok {
return
}
// Get ID_AA64PFR0 from sysctl.
pfr0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64PFR0})
if !ok {
return
}
parseARM64SystemRegisters(isar0, pfr0)
}
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