sysdeps/unix/sysv/linux/sparc/getshmlba.c

   1 /* Copyright (C) 2012-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <sys/shm.h>
  20 #include <ldsodefs.h>
  21
  22 int
  23 __getshmlba (void)
  24 {
  25   uint64_t hwcap = GLRO(dl_hwcap);
  26   int pgsz = GLRO(dl_pagesize);
  27
  28   if (hwcap & HWCAP_SPARC_V9)
  29     {
  30       if (pgsz < (16 * 1024))
  31         return 16 * 1024;
  32       else
  33         return pgsz;
  34     }
  35   else if (!(hwcap & HWCAP_SPARC_FLUSH))
  36     return 64 * 1024;
  37   else
  38     return 256 * 1024;
  39 }