/* Initialize CPU feature data via IFUNC relocation.

   Copyright (C) 2015-2020 Free Software Foundation, Inc.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <ldsodefs.h>

#ifdef SHARED

# include <cpu-features.c>

/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize

   CPU features in dynamic executable.  But when loading ld.so inside of

   static executable, DL_PLATFORM_INIT isn't called and IFUNC relocation

   is used to call init_cpu_features.  In static executable, it is called

   once by IFUNC relocation.  In dynamic executable, it is called twice

   by DL_PLATFORM_INIT and by IFUNC relocation.  */

extern void __x86_cpu_features (void) attribute_hidden;

const void (*__x86_cpu_features_p) (void) attribute_hidden

  = __x86_cpu_features;

void

_dl_x86_init_cpu_features (void)

{

  struct cpu_features *cpu_features = __get_cpu_features ();

  if (cpu_features->basic.kind == arch_kind_unknown)

    init_cpu_features (cpu_features);

}

__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void,

	 _dl_x86_init_cpu_features);

#endif

#undef __x86_get_cpu_features

const struct cpu_features *

__x86_get_cpu_features (unsigned int max)

{

  if (max > COMMON_CPUID_INDEX_MAX)

    return NULL;

  return &GLRO(dl_x86_cpu_features);

}