mirror of git://sourceware.org/git/glibc.git
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* 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 <assert.h>
|
|
#include <unistd.h>
|
|
#include <cpuid.h>
|
|
#include <ldsodefs.h>
|
|
#include <dl-cacheinfo.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 ();
|
|
|
|
if (cpu_features->basic.kind == arch_kind_intel)
|
|
return handle_intel (name, cpu_features);
|
|
|
|
if (cpu_features->basic.kind == arch_kind_amd)
|
|
return handle_amd (name);
|
|
|
|
if (cpu_features->basic.kind == arch_kind_zhaoxin)
|
|
return handle_zhaoxin (name);
|
|
|
|
// XXX Fill in more vendors.
|
|
|
|
/* CPU not known, we have no information. */
|
|
return 0;
|
|
}
|
|
|
|
# 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;
|
|
const void (*__x86_cacheinfo_p) (void) attribute_hidden
|
|
= __x86_cacheinfo;
|
|
|
|
__ifunc (__x86_cacheinfo, __x86_cacheinfo, NULL, void, init_cacheinfo);
|
|
# endif
|
|
#endif
|