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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-10-14 09:47:08 -0300 |
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| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-12-01 11:51:10 -0200 |
| commit | 2a14526bfae3ee4fe34fc39efeea6ee93f25be32 (patch) | |
| tree | 49f91aeb2f6e8d62e1c88f79e7e59e19d93b8dbb /sysdeps/sparc/sparc64/cpu_relax.c | |
| parent | 1c051a9b09339c26a9ada5aeff1b184654cafaf2 (diff) | |
| download | glibc-2a14526bfae3ee4fe34fc39efeea6ee93f25be32.tar.gz glibc-2a14526bfae3ee4fe34fc39efeea6ee93f25be32.tar.xz glibc-2a14526bfae3ee4fe34fc39efeea6ee93f25be32.zip | |
sparc: refactor cpu_relax to C
* sysdeps/sparc/sparc64/cpu_relax.c: New file. * sysdeps/sparc/sparc32/sparcv9/cpu_relax.c: Likewise. * sysdeps/sparc/sparc64/cpu_relax.S: Remove file. * sysdeps/sparc/sparc32/sparcv9/cpu_relax.S: Likewise. Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/sparc/sparc64/cpu_relax.c')
| -rw-r--r-- | sysdeps/sparc/sparc64/cpu_relax.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/cpu_relax.c b/sysdeps/sparc/sparc64/cpu_relax.c new file mode 100644 index 0000000000..7e01186c2c --- /dev/null +++ b/sysdeps/sparc/sparc64/cpu_relax.c @@ -0,0 +1,38 @@ +/* CPU strand yielding for busy loops. Linux/sparc64 version. + Copyright (C) 2017 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 + <http://www.gnu.org/licenses/>. */ + +#include <sparc-ifunc.h> + +static void +__cpu_relax_generic (void) +{ + asm volatile ("rd %ccr, %g0;" + "rd %ccr, %g0;" + "rd %ccr, %g0"); +} + +static void +__cpu_relax_pause (void) +{ + asm volatile ("wr %g0, 128, %asr27"); +} + +sparc_libc_ifunc (__cpu_relax, + hwcap & HWCAP_SPARC_PAUSE + ? __cpu_relax_pause + : __cpu_relax_generic) |