1// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build (386 || amd64 || amd64p32) && gccgo
6
7#include <cpuid.h>
8#include <stdint.h>
9#include <x86intrin.h>
10
11// Need to wrap __get_cpuid_count because it's declared as static.
12int
13gccgoGetCpuidCount(uint32_t leaf, uint32_t subleaf,
14 uint32_t *eax, uint32_t *ebx,
15 uint32_t *ecx, uint32_t *edx)
16{
17 return __get_cpuid_count(leaf, subleaf, eax, ebx, ecx, edx);
18}
19
20#pragma GCC diagnostic ignored "-Wunknown-pragmas"
21#pragma GCC push_options
22#pragma GCC target("xsave")
23#pragma clang attribute push (__attribute__((target("xsave"))), apply_to=function)
24
25// xgetbv reads the contents of an XCR (Extended Control Register)
26// specified in the ECX register into registers EDX:EAX.
27// Currently, the only supported value for XCR is 0.
28void
29gccgoXgetbv(uint32_t *eax, uint32_t *edx)
30{
31 uint64_t v = _xgetbv(0);
32 *eax = v & 0xffffffff;
33 *edx = v >> 32;
34}
35
36#pragma clang attribute pop
37#pragma GCC pop_options
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