3d338229dc
PR go/88927
runtime, internal/cpu: fix build for ARM GNU/Linux
Was failing with
../../../libgo/go/internal/cpu/cpu.go:138:2: error: reference to undefined name 'doinit'
138 | doinit()
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Fix it by adding in Go 1.12 internal/cpu/cpu_arm.go, and the code in
runtime that initializes the values.
Fixes https://gcc.gnu.org/PR88927.
Reviewed-on: https://go-review.googlesource.com/c/158717
From-SVN: r268131
34 lines
853 B
Go
34 lines
853 B
Go
// Copyright 2017 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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package cpu
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// arm doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
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// These are linknamed in runtime/os_(linux|freebsd)_arm.go and are
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// initialized by archauxv().
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// These should not be changed after they are initialized.
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var HWCap uint
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var HWCap2 uint
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// HWCAP/HWCAP2 bits. These are exposed by Linux and FreeBSD.
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const (
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hwcap_VFPv4 = 1 << 16
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hwcap_IDIVA = 1 << 17
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)
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func doinit() {
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options = []option{
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{Name: "vfpv4", Feature: &ARM.HasVFPv4},
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{Name: "idiva", Feature: &ARM.HasIDIVA},
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}
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// HWCAP feature bits
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ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)
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ARM.HasIDIVA = isSet(HWCap, hwcap_IDIVA)
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}
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func isSet(hwc uint, value uint) bool {
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return hwc&value != 0
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}
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