| /* CPU strand yielding for busy loops. |
| Copyright (C) 2012-2014 Free Software Foundation, Inc. |
| Contributed by David S. Miller (davem@davemloft.net) |
| 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 <sysdep.h> |
| |
| .text |
| __cpu_relax_generic: |
| rd %ccr, %g0 |
| rd %ccr, %g0 |
| rd %ccr, %g0 |
| retl |
| nop |
| .size __cpu_relax_generic,.-__cpu_relax_generic |
| |
| __cpu_relax_pause: |
| wr %g0, 128, %asr27 |
| retl |
| nop |
| .size __cpu_relax_pause,.-__cpu_relax_pause |
| |
| ENTRY(__cpu_relax) |
| .type __cpu_relax, @gnu_indirect_function |
| # ifdef SHARED |
| SETUP_PIC_REG_LEAF(o3, o5) |
| # endif |
| set HWCAP_SPARC_PAUSE, %o1 |
| andcc %o0, %o1, %g0 |
| be 1f |
| nop |
| # ifdef SHARED |
| sethi %gdop_hix22(__cpu_relax_pause), %o1 |
| xor %o1, %gdop_lox10(__cpu_relax_pause), %o1 |
| # else |
| set __cpu_relax_pause, %o1 |
| # endif |
| ba 10f |
| nop |
| 1: |
| # ifdef SHARED |
| sethi %gdop_hix22(__cpu_relax_generic), %o1 |
| xor %o1, %gdop_lox10(__cpu_relax_generic), %o1 |
| # else |
| set __cpu_relax_generic, %o1 |
| # endif |
| 10: |
| # ifdef SHARED |
| add %o3, %o1, %o1 |
| # endif |
| retl |
| mov %o1, %o0 |
| END(__cpu_relax) |
