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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* This file is part of the GNU C Library.
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Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sys/param.h>
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enum
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{
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COMMON_CPUID_INDEX_1 = 0,
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/* Keep the following line at the end. */
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COMMON_CPUID_INDEX_MAX
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};
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extern struct cpu_features
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{
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enum
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{
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arch_kind_unknown = 0,
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arch_kind_intel,
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arch_kind_amd,
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arch_kind_other
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} kind;
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int max_cpuid;
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struct cpuid_registers
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{
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unsigned int eax;
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unsigned int ebx;
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unsigned int ecx;
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unsigned int edx;
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} cpuid[COMMON_CPUID_INDEX_MAX];
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unsigned int family;
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unsigned int model;
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} __cpu_features attribute_hidden;
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extern void __init_cpu_features (void) attribute_hidden;
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#define INIT_ARCH()\
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do \
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if (__cpu_features.kind == arch_kind_unknown) \
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__init_cpu_features (); \
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while (0)
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/* Used from outside libc.so to get access to the CPU features structure. */
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extern const struct cpu_features *__get_cpu_features (void)
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__attribute__ ((const));
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#ifndef NOT_IN_libc
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# define __get_cpu_features() (&__cpu_features)
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#endif
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#define HAS_CPU_FEATURE(idx, reg, bit) \
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((__get_cpu_features ()->cpuid[idx].reg & (1 << (bit))) != 0)
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/* Following are the feature tests used throughout libc. */
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#define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, 26)
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#define HAS_POPCOUNT HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 23)
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#define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 20)
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#define HAS_FMA HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 12)
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