89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
|
/* x86 cache info.
|
||
|
|
Copyright (C) 2003-2022 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_ICACHE_LINESIZE:
|
||
|
|
return cpu_features->level1_icache_linesize;
|
||
|
|
|
||
|
|
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
|