800 Star 2.4K Fork 1.2K

GVPHuawei LiteOS / LiteOS

加入 Gitee
与超过 1200万 开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)
免费加入
克隆/下载
spinlock.S 2.13 KB
一键复制 编辑 Web IDE 原始数据 按行查看 历史
kenneth 提交于 2020-12-01 10:20 . feat:sync arch arm64 dir with v2r5
/*----------------------------------------------------------------------------
* Copyright (c) Huawei Technologies Co., Ltd. 2018-2020. All rights reserved.
* Description: Spinlock Assembly
* Author: Huawei LiteOS Team
* Create: 2018-07-11
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*---------------------------------------------------------------------------*/
#include "arch/asm.h"
FUNCTION(ArchSpinLock)
mov w2, #1
sevl
1:
wfe
ldaxr w1, [x0]
cbnz w1, 1b
stxr w1, w2, [x0]
cbnz w1, 1b
ret
FUNCTION(ArchSpinTrylock)
mov w2, #1
ldaxr w1, [x0]
cbnz w1, 1f
stxr w1, w2, [x0]
1:
mov w0, w1
ret
FUNCTION(ArchSpinUnlock)
stlr xzr, [x0]
ret
C
1
https://gitee.com/LiteOS/LiteOS.git
git@gitee.com:LiteOS/LiteOS.git
LiteOS
LiteOS
LiteOS
master

搜索帮助