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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:15:26 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:15:26 +0000 |
commit | 82539ad8d59729fb45b0bb0edda8f2bddb719eb1 (patch) | |
tree | 58f0b58e6f44f0e04d4a6373132cf426fa835fa7 /src/internal/cpu/cpu_arm.go | |
parent | Initial commit. (diff) | |
download | golang-1.17-upstream.tar.xz golang-1.17-upstream.zip |
Adding upstream version 1.17.13.upstream/1.17.13upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/internal/cpu/cpu_arm.go | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/internal/cpu/cpu_arm.go b/src/internal/cpu/cpu_arm.go new file mode 100644 index 0000000..b624526 --- /dev/null +++ b/src/internal/cpu/cpu_arm.go @@ -0,0 +1,34 @@ +// 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 +} |