mirror of
git://sourceware.org/git/glibc.git
synced 2025-03-06 20:58:33 +01:00
095067efdf
The current IFUNC selection is always using the most recent features which are available via AT_HWCAP. But in some scenarios it is useful to adjust this selection. The environment variable: GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,zzz,.... can be used to enable HWCAP feature yyy, disable HWCAP feature xxx, where the feature name is case-sensitive and has to match the ones used in sysdeps/loongarch/cpu-tunables.c. Signed-off-by: caiyinyu <caiyinyu@loongson.cn>
30 lines
1.2 KiB
C
30 lines
1.2 KiB
C
/* Initialize CPU feature data. LoongArch64 version.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 2024 Free Software Foundation, Inc.
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <cpu-features.h>
|
|
#include <elf/dl-hwcaps.h>
|
|
#include <elf/dl-tunables.h>
|
|
extern void TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *) attribute_hidden;
|
|
|
|
static inline void
|
|
init_cpu_features (struct cpu_features *cpu_features)
|
|
{
|
|
GLRO(dl_larch_cpu_features).hwcap = GLRO(dl_hwcap);
|
|
TUNABLE_GET (glibc, cpu, hwcaps, tunable_val_t *,
|
|
TUNABLE_CALLBACK (set_hwcaps));
|
|
}
|