path: root/sysdeps/x86/cpu-features.c

/* Initialize CPU feature data.
   This file is part of the GNU C Library.
   Copyright (C) 2008-2021 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
   <https://www.gnu.org/licenses/>.  */

#include <dl-hwcap.h>
#include <libc-pointer-arith.h>
#include <get-isa-level.h>
#include <cacheinfo.h>
#include <dl-cacheinfo.h>
#include <dl-minsigstacksize.h>

#if HAVE_TUNABLES
extern void TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *)
  attribute_hidden;

# if CET_ENABLED
extern void TUNABLE_CALLBACK (set_x86_ibt) (tunable_val_t *)
  attribute_hidden;
extern void TUNABLE_CALLBACK (set_x86_shstk) (tunable_val_t *)
  attribute_hidden;
# endif
#endif

#if CET_ENABLED
# include <dl-cet.h>
#endif

static void
update_active (struct cpu_features *cpu_features)
{
  /* Copy the cpuid bits to active bits for CPU featuress whose usability
     in user space can be detected without additonal OS support.  */
  CPU_FEATURE_SET_ACTIVE (cpu_features, SSE3);
  CPU_FEATURE_SET_ACTIVE (cpu_features, PCLMULQDQ);
  CPU_FEATURE_SET_ACTIVE (cpu_features, SSSE3);
  CPU_FEATURE_SET_ACTIVE (cpu_features, CMPXCHG16B);
  CPU_FEATURE_SET_ACTIVE (cpu_features, SSE4_1);
  CPU_FEATURE_SET_ACTIVE (cpu_features, SSE4_2);
  CPU_FEATURE_SET_ACTIVE (cpu_features, MOVBE);
  CPU_FEATURE_SET_ACTIVE (cpu_features, POPCNT);
  CPU_FEATURE_SET_ACTIVE (cpu_features, AES);
  CPU_FEATURE_SET_ACTIVE (cpu_features, OSXSAVE);
  CPU_FEATURE_SET_ACTIVE (cpu_features, TSC);
  CPU_FEATURE_SET_ACTIVE (cpu_features, CX8);
  CPU_FEATURE_SET_ACTIVE (cpu_features, CMOV);
  CPU_FEATURE_SET_ACTIVE (cpu_features, CLFSH);
  CPU_FEATURE_SET_ACTIVE (cpu_features, MMX);
  CPU_FEATURE_SET_ACTIVE (cpu_features, FXSR);
  CPU_FEATURE_SET_ACTIVE (cpu_features, SSE