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b8be2fde2a
Change-Id: I597a83c767bf597f4d5c2ffdd7097f3cd6781f84 Reviewed-on: https://go-review.googlesource.com/c/sys/+/460158 Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Heschi Kreinick <heschi@google.com>
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
// 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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// +build 386 amd64 amd64p32
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// +build gccgo
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#include <cpuid.h>
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#include <stdint.h>
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#include <x86intrin.h>
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// Need to wrap __get_cpuid_count because it's declared as static.
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int
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gccgoGetCpuidCount(uint32_t leaf, uint32_t subleaf,
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uint32_t *eax, uint32_t *ebx,
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uint32_t *ecx, uint32_t *edx)
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{
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return __get_cpuid_count(leaf, subleaf, eax, ebx, ecx, edx);
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}
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#pragma GCC diagnostic ignored "-Wunknown-pragmas"
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#pragma GCC push_options
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#pragma GCC target("xsave")
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#pragma clang attribute push (__attribute__((target("xsave"))), apply_to=function)
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// xgetbv reads the contents of an XCR (Extended Control Register)
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// specified in the ECX register into registers EDX:EAX.
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// Currently, the only supported value for XCR is 0.
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void
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gccgoXgetbv(uint32_t *eax, uint32_t *edx)
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{
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uint64_t v = _xgetbv(0);
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*eax = v & 0xffffffff;
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*edx = v >> 32;
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}
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#pragma clang attribute pop
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#pragma GCC pop_options
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