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 #ifdef  __ASSEMBLER__
  20
  21 #include <ifunc-defines.h>
  22
  23 #define bit_SSSE3       (1 << 9)
  24 #define bit_SSE4_2      (1 << 20)
  25
  26 #define index_SSSE3     COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
  27 #define index_SSE4_2    COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
  28
  29 #else   /* __ASSEMBLER__ */
  30
  31 #include <sys/param.h>
  32
  33 enum
  34   {
  35     COMMON_CPUID_INDEX_1 = 0,
  36     /* Keep the following line at the end.  */
  37     COMMON_CPUID_INDEX_MAX
  38   };
  39
  40 extern struct cpu_features
  41 {
  42   enum
  43     {
  44       arch_kind_unknown = 0,
  45       arch_kind_intel,
  46       arch_kind_amd,
  47       arch_kind_other
  48     } kind;
  49   int max_cpuid;
  50   struct cpuid_registers
  51   {
  52     unsigned int eax;
  53     unsigned int ebx;
  54     unsigned int ecx;
  55     unsigned int edx;
  56   } cpuid[COMMON_CPUID_INDEX_MAX];
  57   unsigned int family;
  58   unsigned int model;
  59 } __cpu_features attribute_hidden;
  60
  61
  62 extern void __init_cpu_features (void) attribute_hidden;
  63 #define INIT_ARCH()\
  64   do                                                    \
  65     if (__cpu_features.kind == arch_kind_unknown)       \
  66       __init_cpu_features ();                           \
  67   while (0)
  68
  69 /* Used from outside libc.so to get access to the CPU features structure.  */
  70 extern const struct cpu_features *__get_cpu_features (void)
  71      __attribute__ ((const));
  72
  73 #ifndef NOT_IN_libc
  74 # define __get_cpu_features()   (&__cpu_features)
  75 #endif
  76
  77 #define HAS_CPU_FEATURE(idx, reg, bit) \
  78   ((__get_cpu_features ()->cpuid[idx].reg & (1 << (bit))) != 0)
  79
  80 /* Following are the feature tests used throughout libc.  */
  81
  82 #define HAS_SSE2        HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, 26)
  83 #define HAS_POPCOUNT    HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 23)
  84 #define HAS_SSE4_2      HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 20)
  85 #define HAS_FMA         HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 12)
  86
  87 #endif  /* __ASSEMBLER__ */