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/* 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];
} __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)
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