sysdeps/x86/get-cpuid-feature-leaf.c

   1 /* Get CPUID feature leaf.
   2    Copyright (C) 2021-2023 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18
  19 #include <ldsodefs.h>
  20
  21 const struct cpuid_feature *
  22 __x86_get_cpuid_feature_leaf (unsigned int leaf)
  23 {
  24   static const struct cpuid_feature feature = {};
  25   if (leaf < CPUID_INDEX_MAX)
  26     return ((const struct cpuid_feature *)
  27               &GLRO(dl_x86_cpu_features).features[leaf]);
  28   else
  29     return &feature;
  30 }