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963cb6fcb4
SO far Intel and AMD use exactly the same bits meaning the same things in CPUID index 1. Simplify the code. Should an architecture come along which doesn't use the same semantics then it must use a different index value than COMMON_CPUID_INDEX_1.
62 lines
1.9 KiB
C
62 lines
1.9 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, 2009 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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get_common_cpuid:
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asm volatile ("cpuid"
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: "=a" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax),
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"=b" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx),
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"=c" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx),
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"=d" (__cpu_features.cpuid[COMMON_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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goto get_common_cpuid;
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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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