sysdeps/unix/sysv/linux/arm/dl-procinfo.h

   1 /* Linux/ARM version of processor capability information handling macros.
   2    Copyright (C) 2001-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Philip Blundell <philb@gnu.org>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _DL_PROCINFO_H
  21 #define _DL_PROCINFO_H  1
  22
  23 #include <ldsodefs.h>
  24 #include <sysdep.h>
  25
  26 #define _DL_HWCAP_COUNT 27
  27
  28 /* Low 22 bits are allocated in HWCAP.  */
  29 #define _DL_HWCAP_LAST          21
  30
  31 /* Low 5 bits are allocated in HWCAP2.  */
  32 #define _DL_HWCAP2_LAST         4
  33
  34 /* The kernel provides platform data but it is not interesting.  */
  35 #define _DL_HWCAP_PLATFORM      0
  36
  37
  38 static inline const char *
  39 __attribute__ ((unused))
  40 _dl_hwcap_string (int idx)
  41 {
  42   return GLRO(dl_arm_cap_flags)[idx];
  43 };
  44
  45 static inline int
  46 __attribute__ ((unused))
  47 _dl_procinfo (unsigned int type, unsigned long int word)
  48 {
  49   switch(type)
  50     {
  51     case AT_HWCAP:
  52       _dl_printf ("AT_HWCAP:       ");
  53
  54       for (int i = 0; i <= _DL_HWCAP_LAST; ++i)
  55         if (word & (1 << i))
  56           _dl_printf (" %s", _dl_hwcap_string (i));
  57       break;
  58     case AT_HWCAP2:
  59       {
  60         unsigned int offset = _DL_HWCAP_LAST + 1;
  61
  62         _dl_printf ("AT_HWCAP2:      ");
  63
  64         for (int i = 0; i <= _DL_HWCAP2_LAST; ++i)
  65           if (word & (1 << i))
  66             _dl_printf (" %s", _dl_hwcap_string (offset + i));
  67         break;
  68       }
  69     default:
  70       /* Fallback to generic output mechanism.  */
  71       return -1;
  72     }
  73   _dl_printf ("\n");
  74   return 0;
  75 }
  76
  77 #define HWCAP_IMPORTANT         (HWCAP_ARM_VFP | HWCAP_ARM_NEON)
  78
  79 static inline int
  80 __attribute__ ((unused))
  81 _dl_string_hwcap (const char *str)
  82 {
  83   for (int i = 0; i < _DL_HWCAP_COUNT; i++)
  84     {
  85       if (strcmp (str, _dl_hwcap_string (i)) == 0)
  86         return i;
  87     }
  88   return -1;
  89 };
  90
  91 #define _dl_string_platform(str) (-1)
  92
  93 #endif /* dl-procinfo.h */