1  /* Handle AT_HWCAP2.  Linux/x86 version.
       2     Copyright (C) 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  /* The following must match the kernel's <asm/hwcap2.h>.  */
      19  #define HWCAP2_RING3MWAIT	(1 << 0)
      20  #define HWCAP2_FSGSBASE		(1 << 1)
      21  
      22  static inline void
      23  dl_check_hwcap2 (struct cpu_features *cpu_features)
      24  {
      25    if ((GLRO(dl_hwcap2) & HWCAP2_FSGSBASE) != 0)
      26      CPU_FEATURE_SET_ACTIVE (cpu_features, FSGSBASE);
      27  }