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Darwin opmask clobbering bug was fixed in kernel version 21.3.0 as released in MacOS 12.2.0. This commit resolves issue by checking for Darwin AVX512 support via a sysctl call with the addition of a kernel minimum version check. The kernel version check is completed without adding new dependencies to x/sys/cpu. A sysctl call is accomplished by copying a minimal amount of code from x/sys/unix, to retrieve only the needed KERN_OSRELEASE value. This code is structured in the same manner as an existing analogous AIX/PPC64 syscall. The resulting dotted version string value is then parsed for numeric comparison with a dependency free function. All code in this contribution is structured to ease removal of the special darwin/amd64 codepaths when that OS/arch combination is eventually no longer supported by golang. Resolves issue: golang/go#49233, reinstates fix for issue: golang/go#43089 Change-Id: I4755fc8b3865eb6562b0959ecc910e2c46ac6cb4 Reviewed-on: https://go-review.googlesource.com/c/sys/+/620256 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: vsivsi@yahoo.com <vsivsi@yahoo.com>
26 lines
630 B
Go
26 lines
630 B
Go
// Copyright 2018 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 (386 || amd64 || amd64p32) && gccgo
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package cpu
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//extern gccgoGetCpuidCount
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func gccgoGetCpuidCount(eaxArg, ecxArg uint32, eax, ebx, ecx, edx *uint32)
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func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32) {
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var a, b, c, d uint32
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gccgoGetCpuidCount(eaxArg, ecxArg, &a, &b, &c, &d)
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return a, b, c, d
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}
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//extern gccgoXgetbv
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func gccgoXgetbv(eax, edx *uint32)
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func xgetbv() (eax, edx uint32) {
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var a, d uint32
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gccgoXgetbv(&a, &d)
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return a, d
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}
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