sysdeps/unix/sysv/linux/tile/sysconf.c

   1 /* Copyright (C) 2014-2015 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/sysinfo.h>
  20 #include <arch/chip.h>
  21
  22 static long int linux_sysconf (int name);
  23
  24 /* Get the value of the system variable NAME.  */
  25 long int
  26 __sysconf (int name)
  27 {
  28   /* Currently we support only tilepro and tilegx, which have
  29      statically-known cache sizes.  */
  30   switch (name)
  31     {
  32     /* Level 1 cache.  */
  33     case _SC_LEVEL1_ICACHE_SIZE:
  34       return CHIP_L1I_CACHE_SIZE();
  35     case _SC_LEVEL1_ICACHE_ASSOC:
  36       return CHIP_L1I_ASSOC();
  37     case _SC_LEVEL1_ICACHE_LINESIZE:
  38       return CHIP_L1I_LINE_SIZE();
  39     case _SC_LEVEL1_DCACHE_SIZE:
  40       return CHIP_L1D_CACHE_SIZE();
  41     case _SC_LEVEL1_DCACHE_ASSOC:
  42       return CHIP_L1D_ASSOC();
  43     case _SC_LEVEL1_DCACHE_LINESIZE:
  44       return CHIP_L1D_LINE_SIZE();
  45
  46     /* Level 2 cache.  */
  47     case _SC_LEVEL2_CACHE_SIZE:
  48       return CHIP_L2_CACHE_SIZE();
  49     case _SC_LEVEL2_CACHE_ASSOC:
  50       return CHIP_L2_ASSOC();
  51     case _SC_LEVEL2_CACHE_LINESIZE:
  52       return CHIP_L2_LINE_SIZE();
  53
  54     /* Level 3 cache is layered on level 2 cache.  */
  55     case _SC_LEVEL3_CACHE_SIZE:
  56       return CHIP_L2_CACHE_SIZE() * __get_nprocs();
  57     case _SC_LEVEL3_CACHE_ASSOC:
  58       return CHIP_L2_ASSOC();
  59     case _SC_LEVEL3_CACHE_LINESIZE:
  60       return CHIP_L2_LINE_SIZE();
  61
  62     /* No level 4 cache.  */
  63     case _SC_LEVEL4_CACHE_SIZE:
  64     case _SC_LEVEL4_CACHE_ASSOC:
  65     case _SC_LEVEL4_CACHE_LINESIZE:
  66       return -1;
  67     }
  68
  69   return linux_sysconf (name);
  70 }
  71
  72 /* Now the generic Linux version.  */
  73 #undef __sysconf
  74 #define __sysconf static linux_sysconf
  75 #include <sysdeps/unix/sysv/linux/sysconf.c>