41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* CPU strand yielding for busy loops. Linux/sparc version.
|
|
Copyright (C) 2017-2022 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/>. */
|
|
|
|
#include <sparc-ifunc.h>
|
|
|
|
#ifdef __sparc_v9__
|
|
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)
|
|
#endif
|