mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* This file is part of the GNU C Library.
|
|
Copyright (C) 2008, 2009 Free Software Foundation, Inc.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sys/param.h>
|
|
|
|
enum
|
|
{
|
|
COMMON_CPUID_INDEX_1 = 0,
|
|
/* Keep the following line at the end. */
|
|
COMMON_CPUID_INDEX_MAX
|
|
};
|
|
|
|
extern struct cpu_features
|
|
{
|
|
enum
|
|
{
|
|
arch_kind_unknown = 0,
|
|
arch_kind_intel,
|
|
arch_kind_amd,
|
|
arch_kind_other
|
|
} kind;
|
|
int max_cpuid;
|
|
struct cpuid_registers
|
|
{
|
|
unsigned int eax;
|
|
unsigned int ebx;
|
|
unsigned int ecx;
|
|
unsigned int edx;
|
|
} cpuid[COMMON_CPUID_INDEX_MAX];
|
|
unsigned int family;
|
|
unsigned int model;
|
|
} __cpu_features attribute_hidden;
|
|
|
|
|
|
extern void __init_cpu_features (void) attribute_hidden;
|
|
#define INIT_ARCH()\
|
|
do \
|
|
if (__cpu_features.kind == arch_kind_unknown) \
|
|
__init_cpu_features (); \
|
|
while (0)
|
|
|
|
/* Following are the feature tests used throughout libc. */
|
|
|
|
#define HAS_POPCOUNT \
|
|
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
|
|
|
|
#define HAS_SSE4_2 \
|
|
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 20)) != 0)
|