/* CPU strand yielding for busy loops. Linux/sparc version. Copyright (C) 2017-2020 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