71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
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/* This file is part of the GNU C Library.
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Copyright (C) 2008 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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INTEL_CPUID_INDEX_1 = 0,
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/* Keep the following line at the end. */
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INTEL_CPUID_INDEX_MAX
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};
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enum
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{
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AMD_CPUID_INDEX_1 = 0,
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/* Keep the following line at the end. */
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AMD_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
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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[MAX (INTEL_CPUID_INDEX_MAX, AMD_CPUID_INDEX_MAX)];
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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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/* Following are the feature tests used throughout libc. */
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#define INTEL_HAS_POPCOUNT \
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(__cpu_features.kind == arch_kind_intel \
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&& (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
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#define AMD_HAS_POPCOUNT \
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(__cpu_features.kind == arch_kind_amd \
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&& (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
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