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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
commit73df946d56c74384511a194dd01dbe099584fd1a (patch)
treefd0bcea490dd81327ddfbb31e215439672c9a068 /src/internal/cpu/cpu_arm.go
parentInitial commit. (diff)
downloadgolang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.tar.xz
golang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.zip
Adding upstream version 1.16.10.upstream/1.16.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/internal/cpu/cpu_arm.go')
-rw-r--r--src/internal/cpu/cpu_arm.go34
1 files changed, 34 insertions, 0 deletions
diff --git a/src/internal/cpu/cpu_arm.go b/src/internal/cpu/cpu_arm.go
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+++ b/src/internal/cpu/cpu_arm.go
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+// 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
+
+const CacheLinePadSize = 32
+
+// arm doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
+// These are initialized by archauxv() and 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
+}