diff options
author | caiyinyu <caiyinyu@loongson.cn> | 2023-09-15 17:35:19 +0800 |
---|---|---|
committer | caiyinyu <caiyinyu@loongson.cn> | 2024-04-24 18:22:38 +0800 |
commit | 095067efdf68c8061d6f99a21a0300841bede999 (patch) | |
tree | 6632c0cb08991fbd2c08809f24320493687c81a6 /sysdeps/unix/sysv/linux/loongarch/cpu-features.c | |
parent | f4724843ada64a51d66f65d3199fe431f9d4c254 (diff) | |
download | glibc-095067efdf68c8061d6f99a21a0300841bede999.tar.gz glibc-095067efdf68c8061d6f99a21a0300841bede999.tar.xz glibc-095067efdf68c8061d6f99a21a0300841bede999.zip |
LoongArch: Add glibc.cpu.hwcap support.
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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/loongarch/cpu-features.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/loongarch/cpu-features.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/loongarch/cpu-features.c b/sysdeps/unix/sysv/linux/loongarch/cpu-features.c new file mode 100644 index 0000000000..ba6201ad0c --- /dev/null +++ b/sysdeps/unix/sysv/linux/loongarch/cpu-features.c @@ -0,0 +1,30 @@ +/* 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)); +} |