| 1 | /* Get system-specific information at run-time. Linux/powerpc version. |
|---|---|
| 2 | Copyright (C) 2017-2022 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" |
| 76 |