66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/* Initialize CPU feature data.
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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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Contributed by Ulrich Drepper <drepper@redhat.com>.
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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 "init-arch.h"
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struct cpu_features __cpu_features attribute_hidden;
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void
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__init_cpu_features (void)
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{
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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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asm volatile ("cpuid"
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: "=a" (__cpu_features.max_cpuid), "=b" (ebx), "=c" (ecx),
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"=d" (edx)
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: "0" (0));
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/* This spells out "GenuineIntel". */
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if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
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{
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__cpu_features.kind = arch_kind_intel;
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asm volatile ("cpuid"
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: "=a" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].eax),
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"=b" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ebx),
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"=c" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx),
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"=d" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].edx)
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: "0" (1));
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}
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/* This spells out "AuthenticAMD". */
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else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
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{
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__cpu_features.kind = arch_kind_amd;
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asm volatile ("cpuid"
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: "=a" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].eax),
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"=b" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ebx),
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"=c" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx),
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"=d" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].edx)
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: "0" (1));
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}
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else
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__cpu_features.kind = arch_kind_other;
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}
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