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108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/* Copyright (C) 2020-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/auxv.h>
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#include <stdbool.h>
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static long int linux_sysconf (int name);
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static inline bool
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getauxval2_einval (unsigned long int type, unsigned long int *result)
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{
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if (__getauxval2 (type, result))
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return true;
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__set_errno (EINVAL);
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return false;
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}
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static inline long int
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sysconf_get_cache_associativity (unsigned long type)
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{
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unsigned long int result;
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if (getauxval2_einval (type, &result))
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return (result & 0xffff0000) >> 16;
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return -1;
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}
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static inline long int
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sysconf_get_cache_linesize (unsigned long type)
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{
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unsigned long int result;
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if (getauxval2_einval (type, &result))
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return result & 0xffff;
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return -1;
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}
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static inline long int
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sysconf_get_cache_size (unsigned long type)
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{
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unsigned long int result;
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if (getauxval2_einval (type, &result))
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return result;
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return -1;
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}
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/* Get the value of the system variable NAME. */
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long int
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__sysconf (int name)
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{
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switch (name)
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{
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case _SC_LEVEL1_ICACHE_SIZE:
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return sysconf_get_cache_size (AT_L1I_CACHESIZE);
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case _SC_LEVEL1_ICACHE_ASSOC:
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return sysconf_get_cache_associativity (AT_L1I_CACHEGEOMETRY);
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case _SC_LEVEL1_ICACHE_LINESIZE:
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return sysconf_get_cache_linesize (AT_L1I_CACHEGEOMETRY);
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case _SC_LEVEL1_DCACHE_SIZE:
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return sysconf_get_cache_size (AT_L1D_CACHESIZE);
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case _SC_LEVEL1_DCACHE_ASSOC:
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return sysconf_get_cache_associativity (AT_L1D_CACHEGEOMETRY);
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case _SC_LEVEL1_DCACHE_LINESIZE:
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return sysconf_get_cache_linesize (AT_L1D_CACHEGEOMETRY);
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case _SC_LEVEL2_CACHE_SIZE:
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return sysconf_get_cache_size (AT_L2_CACHESIZE);
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case _SC_LEVEL2_CACHE_ASSOC:
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return sysconf_get_cache_associativity (AT_L2_CACHEGEOMETRY);
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case _SC_LEVEL2_CACHE_LINESIZE:
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return sysconf_get_cache_linesize (AT_L2_CACHEGEOMETRY);
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case _SC_LEVEL3_CACHE_SIZE:
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return sysconf_get_cache_size (AT_L3_CACHESIZE);
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case _SC_LEVEL3_CACHE_ASSOC:
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return sysconf_get_cache_associativity (AT_L3_CACHEGEOMETRY);
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case _SC_LEVEL3_CACHE_LINESIZE:
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return sysconf_get_cache_linesize (AT_L3_CACHEGEOMETRY);
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default:
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return linux_sysconf (name);
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}
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}
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/* Now the generic Linux version. */
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#undef __sysconf
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#define __sysconf static linux_sysconf
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#include <sysdeps/unix/sysv/linux/sysconf.c>
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