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/* x86 cache info.
Copyright (C) 2003-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#if IS_IN (libc)
#include <unistd.h>
#include <ldsodefs.h>
/* Get the value of the system variable NAME. */
long int
attribute_hidden
__cache_sysconf (int name)
{
const struct cpu_features *cpu_features = __get_cpu_features ();
switch (name)
{
case _SC_LEVEL1_ICACHE_SIZE:
return cpu_features->level1_icache_size;
case _SC_LEVEL1_DCACHE_SIZE:
return cpu_features->level1_dcache_size;
case _SC_LEVEL1_DCACHE_ASSOC:
return cpu_features->level1_dcache_assoc;
case _SC_LEVEL1_DCACHE_LINESIZE:
return cpu_features->level1_dcache_linesize;
case _SC_LEVEL2_CACHE_SIZE:
return cpu_features->level2_cache_size;
case _SC_LEVEL2_CACHE_ASSOC:
return cpu_features->level2_cache_assoc;
case _SC_LEVEL2_CACHE_LINESIZE:
return cpu_features->level2_cache_linesize;
case _SC_LEVEL3_CACHE_SIZE:
return cpu_features->level3_cache_size;
case _SC_LEVEL3_CACHE_ASSOC:
return cpu_features->level3_cache_assoc;
case _SC_LEVEL3_CACHE_LINESIZE:
return cpu_features->level3_cache_linesize;
case _SC_LEVEL4_CACHE_SIZE:
return cpu_features->level4_cache_size;
default:
break;
}
return -1;
}
# ifdef SHARED
/* NB: In libc.a, cacheinfo.h is included in libc-start.c. In libc.so,
cacheinfo.h is included here and call init_cacheinfo by initializing
a dummy function pointer via IFUNC relocation after CPU features in
ld.so have been initialized by DL_PLATFORM_INIT or IFUNC relocation. */
# include <cacheinfo.h>
# include <ifunc-init.h>
extern void __x86_cacheinfo (void) attribute_hidden;
void (*const __x86_cacheinfo_p) (void) attribute_hidden
= __x86_cacheinfo;
__ifunc (__x86_cacheinfo, __x86_cacheinfo, NULL, void, init_cacheinfo);
# endif
#endif
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