1  /* Get system-specific information at run-time.  Linux/powerpc version.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <unistd.h>
      21  #include <sys/auxv.h>
      22  
      23  static long linux_sysconf (int name);
      24  
      25  static inline long
      26  auxv2sysconf_cache_associativity (unsigned long type)
      27  {
      28    return (__getauxval (type) & 0xffff0000) >> 16;
      29  }
      30  
      31  static inline long
      32  auxv2sysconf_cache_linesize (unsigned long type)
      33  {
      34    return __getauxval (type) & 0xffff;
      35  }
      36  
      37  /* Get the value of the system variable NAME.  */
      38  long int
      39  __sysconf (int name)
      40  {
      41    switch (name)
      42      {
      43        case _SC_LEVEL1_ICACHE_SIZE:
      44  	return __getauxval (AT_L1I_CACHESIZE);
      45        case _SC_LEVEL1_ICACHE_ASSOC:
      46  	return auxv2sysconf_cache_associativity (AT_L1I_CACHEGEOMETRY);
      47        case _SC_LEVEL1_ICACHE_LINESIZE:
      48  	return auxv2sysconf_cache_linesize (AT_L1I_CACHEGEOMETRY);
      49        case _SC_LEVEL1_DCACHE_SIZE:
      50  	return __getauxval (AT_L1D_CACHESIZE);
      51        case _SC_LEVEL1_DCACHE_ASSOC:
      52  	return auxv2sysconf_cache_associativity (AT_L1D_CACHEGEOMETRY);
      53        case _SC_LEVEL1_DCACHE_LINESIZE:
      54  	return auxv2sysconf_cache_linesize (AT_L1D_CACHEGEOMETRY);
      55        case _SC_LEVEL2_CACHE_SIZE:
      56  	return __getauxval (AT_L2_CACHESIZE);
      57        case _SC_LEVEL2_CACHE_ASSOC:
      58  	return auxv2sysconf_cache_associativity (AT_L2_CACHEGEOMETRY);
      59        case _SC_LEVEL2_CACHE_LINESIZE:
      60  	return auxv2sysconf_cache_linesize (AT_L2_CACHEGEOMETRY);
      61        case _SC_LEVEL3_CACHE_SIZE:
      62  	return __getauxval (AT_L3_CACHESIZE);
      63        case _SC_LEVEL3_CACHE_ASSOC:
      64  	return auxv2sysconf_cache_associativity (AT_L3_CACHEGEOMETRY);
      65        case _SC_LEVEL3_CACHE_LINESIZE:
      66  	return auxv2sysconf_cache_linesize (AT_L3_CACHEGEOMETRY);
      67        default:
      68  	return linux_sysconf (name);
      69      }
      70  }
      71  
      72  /* Now the generic Linux version.  */
      73  #undef __sysconf
      74  #define __sysconf static linux_sysconf
      75  #include "../sysconf.c"