1 /* This file is part of the GNU C Library.
2 Copyright (C) 2008, 2009 Free Software Foundation, Inc.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 #include <sys/param.h>
23 COMMON_CPUID_INDEX_1
= 0,
24 /* Keep the following line at the end. */
25 COMMON_CPUID_INDEX_MAX
28 extern struct cpu_features
32 arch_kind_unknown
= 0,
38 struct cpuid_registers
44 } cpuid
[COMMON_CPUID_INDEX_MAX
];
47 } __cpu_features attribute_hidden
;
50 extern void __init_cpu_features (void) attribute_hidden
;
53 if (__cpu_features.kind == arch_kind_unknown) \
54 __init_cpu_features (); \
57 /* Following are the feature tests used throughout libc. */
59 #define HAS_POPCOUNT \
60 ((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
63 ((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 20)) != 0)