| /* CPU strand yielding for busy loops. Linux/sparc64 version. |
| Copyright (C) 2017-2018 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) |
