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/* Initialize CPU feature data.
This file is part of the GNU C Library.
Copyright (C) 2008 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>.
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 "init-arch.h"
struct cpu_features __cpu_features attribute_hidden;
void
__init_cpu_features (void)
{
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
asm volatile ("cpuid"
: "=a" (__cpu_features.max_cpuid), "=b" (ebx), "=c" (ecx),
"=d" (edx)
: "0" (0));
/* This spells out "GenuineIntel". */
if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
{
__cpu_features.kind = arch_kind_intel;
asm volatile ("cpuid"
: "=a" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].eax),
"=b" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ebx),
"=c" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx),
"=d" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].edx)
: "0" (1));
}
/* This spells out "AuthenticAMD". */
else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
{
__cpu_features.kind = arch_kind_amd;
asm volatile ("cpuid"
: "=a" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].eax),
"=b" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ebx),
"=c" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx),
"=d" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].edx)
: "0" (1));
}
else
__cpu_features.kind = arch_kind_other;
}
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