sysdeps/x86_64/multiarch/init-arch.h

   1 /* This file is part of the GNU C Library.
   2    Copyright (C) 2008, 2009 Free Software Foundation, Inc.
   3
   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.
   8
   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.
  13
  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
  17    02111-1307 USA.  */
  18
  19 #define bit_Fast_Rep_String     (1 << 0)
  20
  21 #ifdef  __ASSEMBLER__
  22
  23 #include <ifunc-defines.h>
  24
  25 #define bit_SSE2        (1 << 26)
  26 #define bit_SSSE3       (1 << 9)
  27 #define bit_SSE4_2      (1 << 20)
  28
  29 #define index_SSE2      COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
  30 #define index_SSSE3     COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
  31 #define index_SSE4_2    COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
  32
  33 #define index_Fast_Rep_String   FEATURE_INDEX_1*FEATURE_SIZE
  34
  35 #else   /* __ASSEMBLER__ */
  36
  37 #include <sys/param.h>
  38
  39 enum
  40   {
  41     COMMON_CPUID_INDEX_1 = 0,
  42     /* Keep the following line at the end.  */
  43     COMMON_CPUID_INDEX_MAX
  44   };
  45
  46 enum
  47   {
  48     FEATURE_INDEX_1 = 0,
  49     /* Keep the following line at the end.  */
  50     FEATURE_INDEX_MAX
  51   };
  52
  53 extern struct cpu_features
  54 {
  55   enum
  56     {
  57       arch_kind_unknown = 0,
  58       arch_kind_intel,
  59       arch_kind_amd,
  60       arch_kind_other
  61     } kind;
  62   int max_cpuid;
  63   struct cpuid_registers
  64   {
  65     unsigned int eax;
  66     unsigned int ebx;
  67     unsigned int ecx;
  68     unsigned int edx;
  69   } cpuid[COMMON_CPUID_INDEX_MAX];
  70   unsigned int family;
  71   unsigned int model;
  72   unsigned int feature[FEATURE_INDEX_MAX];
  73 } __cpu_features attribute_hidden;
  74
  75
  76 extern void __init_cpu_features (void) attribute_hidden;
  77 #define INIT_ARCH()\
  78   do                                                    \
  79     if (__cpu_features.kind == arch_kind_unknown)       \
  80       __init_cpu_features ();                           \
  81   while (0)
  82
  83 /* Used from outside libc.so to get access to the CPU features structure.  */
  84 extern const struct cpu_features *__get_cpu_features (void)
  85      __attribute__ ((const));
  86
  87 #ifndef NOT_IN_libc
  88 # define __get_cpu_features()   (&__cpu_features)
  89 #endif
  90
  91 #define HAS_CPU_FEATURE(idx, reg, bit) \
  92   ((__get_cpu_features ()->cpuid[idx].reg & (1 << (bit))) != 0)
  93
  94 /* Following are the feature tests used throughout libc.  */
  95
  96 #define HAS_SSE2        HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, 26)
  97 #define HAS_POPCOUNT    HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 23)
  98 #define HAS_SSE4_2      HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 20)
  99 #define HAS_FMA         HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 12)
 100
 101 #define index_Fast_Rep_String   FEATURE_INDEX_1
 102
 103 #endif  /* __ASSEMBLER__ */