| // Copyright 2018 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. |
| |
| //go:build (386 || amd64 || amd64p32) && gccgo |
| // +build 386 amd64 amd64p32 |
| // +build gccgo |
| |
| #include <cpuid.h> |
| #include <stdint.h> |
| #include <x86intrin.h> |
| |
| // Need to wrap __get_cpuid_count because it's declared as static. |
| int |
| gccgoGetCpuidCount(uint32_t leaf, uint32_t subleaf, |
| uint32_t *eax, uint32_t *ebx, |
| uint32_t *ecx, uint32_t *edx) |
| { |
| return __get_cpuid_count(leaf, subleaf, eax, ebx, ecx, edx); |
| } |
| |
| #pragma GCC diagnostic ignored "-Wunknown-pragmas" |
| #pragma GCC push_options |
| #pragma GCC target("xsave") |
| #pragma clang attribute push (__attribute__((target("xsave"))), apply_to=function) |
| |
| // xgetbv reads the contents of an XCR (Extended Control Register) |
| // specified in the ECX register into registers EDX:EAX. |
| // Currently, the only supported value for XCR is 0. |
| void |
| gccgoXgetbv(uint32_t *eax, uint32_t *edx) |
| { |
| uint64_t v = _xgetbv(0); |
| *eax = v & 0xffffffff; |
| *edx = v >> 32; |
| } |
| |
| #pragma clang attribute pop |
| #pragma GCC pop_options |