mirror of https://go.googlesource.com/go
29 lines
574 B
Go
29 lines
574 B
Go
// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build arm64
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package cpu
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const (
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// From OpenBSD's sys/sysctl.h.
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_CTL_MACHDEP = 7
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// From OpenBSD's machine/cpu.h.
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_CPU_ID_AA64ISAR0 = 2
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_CPU_ID_AA64ISAR1 = 3
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)
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//go:noescape
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func sysctlUint64(mib []uint32) (uint64, bool)
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func osInit() {
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// Get ID_AA64ISAR0 from sysctl.
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isar0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR0})
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if !ok {
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return
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}
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parseARM64SystemRegisters(isar0)
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}
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