1 /* Initialize CPU feature data.
2 This file is part of the GNU C Library.
3 Copyright (C) 2008, 2009 Free Software Foundation, Inc.
4 Contributed by Ulrich Drepper <drepper@redhat.com>.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #include "init-arch.h"
25 struct cpu_features __cpu_features attribute_hidden
;
29 get_common_indeces (void)
31 __cpuid (1, __cpu_features
.cpuid
[COMMON_CPUID_INDEX_1
].eax
,
32 __cpu_features
.cpuid
[COMMON_CPUID_INDEX_1
].ebx
,
33 __cpu_features
.cpuid
[COMMON_CPUID_INDEX_1
].ecx
,
34 __cpu_features
.cpuid
[COMMON_CPUID_INDEX_1
].edx
);
36 unsigned int eax
= __cpu_features
.cpuid
[COMMON_CPUID_INDEX_1
].eax
;
37 __cpu_features
.family
= (eax
>> 8) & 0x0f;
38 __cpu_features
.model
= (eax
>> 4) & 0x0f;
43 __init_cpu_features (void)
49 __cpuid (0, __cpu_features
.max_cpuid
, ebx
, ecx
, edx
);
51 /* This spells out "GenuineIntel". */
52 if (ebx
== 0x756e6547 && ecx
== 0x6c65746e && edx
== 0x49656e69)
54 __cpu_features
.kind
= arch_kind_intel
;
56 get_common_indeces ();
58 unsigned int eax
= __cpu_features
.cpuid
[COMMON_CPUID_INDEX_1
].eax
;
59 unsigned int extended_family
= (eax
>> 20) & 0xff;
60 unsigned int extended_model
= (eax
>> 12) & 0xf0;
61 if (__cpu_features
.family
== 0x0f)
63 __cpu_features
.family
+= extended_family
;
64 __cpu_features
.model
+= extended_model
;
66 else if (__cpu_features
.family
== 0x06)
67 __cpu_features
.model
+= extended_model
;
69 /* This spells out "AuthenticAMD". */
70 else if (ebx
== 0x68747541 && ecx
== 0x444d4163 && edx
== 0x69746e65)
72 __cpu_features
.kind
= arch_kind_amd
;
74 get_common_indeces ();
77 __cpu_features
.kind
= arch_kind_other
;
81 const struct cpu_features
*
82 __get_cpu_features (void)
84 if (__cpu_features
.kind
== arch_kind_unknown
)
85 __init_cpu_features ();
87 return &__cpu_features
;