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708e7fb298
This adds feature detection that works on the s390x running zos. There are some differences with Linux (no hwcap, facilities vector available in-memory). These changes should not affect other platforms. Fixes golang/go#41984. Change-Id: Ieabbfafd07367a346a4d279dde0f00aa3fc4321b Reviewed-on: https://go-review.googlesource.com/c/sys/+/262477 Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Martin Möhrmann <moehrmann@google.com> Trust: Martin Möhrmann <moehrmann@google.com> Trust: Emmanuel Odeke <emmanuel@orijtech.com>
41 lines
890 B
Go
41 lines
890 B
Go
// Copyright 2019 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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const (
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// bit mask values from /usr/include/bits/hwcap.h
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hwcap_ZARCH = 2
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hwcap_STFLE = 4
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hwcap_MSA = 8
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hwcap_LDISP = 16
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hwcap_EIMM = 32
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hwcap_DFP = 64
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hwcap_ETF3EH = 256
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hwcap_VX = 2048
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hwcap_VXE = 8192
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)
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func initS390Xbase() {
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// test HWCAP bit vector
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has := func(featureMask uint) bool {
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return hwCap&featureMask == featureMask
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}
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// mandatory
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S390X.HasZARCH = has(hwcap_ZARCH)
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// optional
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S390X.HasSTFLE = has(hwcap_STFLE)
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S390X.HasLDISP = has(hwcap_LDISP)
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S390X.HasEIMM = has(hwcap_EIMM)
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S390X.HasETF3EH = has(hwcap_ETF3EH)
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S390X.HasDFP = has(hwcap_DFP)
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S390X.HasMSA = has(hwcap_MSA)
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S390X.HasVX = has(hwcap_VX)
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if S390X.HasVX {
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S390X.HasVXE = has(hwcap_VXE)
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}
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}
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