projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 2a14526b | 1 | /* CPU strand yielding for busy loops. Linux/sparc64 version. |
| 04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
| 2a14526b AZ |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library; if not, see | |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 18 | ||
| 19 | #include <sparc-ifunc.h> | |
| 20 | ||
| 21 | static void | |
| 22 | __cpu_relax_generic (void) | |
| 23 | { | |
| 24 | asm volatile ("rd %ccr, %g0;" | |
| 25 | "rd %ccr, %g0;" | |
| 26 | "rd %ccr, %g0"); | |
| 27 | } | |
| 28 | ||
| 29 | static void | |
| 30 | __cpu_relax_pause (void) | |
| 31 | { | |
| 32 | asm volatile ("wr %g0, 128, %asr27"); | |
| 33 | } | |
| 34 | ||
| 35 | sparc_libc_ifunc (__cpu_relax, | |
| 36 | hwcap & HWCAP_SPARC_PAUSE | |
| 37 | ? __cpu_relax_pause | |
| 38 | : __cpu_relax_generic) |