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/*
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
*
* 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.
*/
/*
函数意义
g_sysClock系统时钟频率用于记录系统的时钟频率。
g_tickPerSecond每秒节拍数用于记录每秒钟发生的节拍数。
g_cycle2NsScale循环周期到纳秒的缩放比例用于将节拍周期转换为纳秒。
g_tickSpin任务模块的自旋锁用于保护对任务模块的访问。
OsTickHandler()节拍中断处理函数处理与节拍相关的操作。在函数内部可能会进行一些特定平台的操作如调试记录数据、更新虚拟动态共享对象VDSO的时间值等。然后调用OsSchedTick()函数,处理调度器的节拍操作。
*/
#include "los_tick_pri.h"
#include "los_swtmr_pri.h"
#include "los_sched_pri.h"
#ifdef LOSCFG_KERNEL_VDSO
#include "los_vdso.h"
#endif
// 系统时钟频率
LITE_OS_SEC_DATA_INIT UINT32 g_sysClock;
// 每秒节拍数
LITE_OS_SEC_DATA_INIT UINT32 g_tickPerSecond;
// 循环周期到纳秒的缩放比例
LITE_OS_SEC_BSS DOUBLE g_cycle2NsScale;
// 任务模块的自旋锁
LITE_OS_SEC_BSS SPIN_LOCK_INIT(g_tickSpin);
/*
* Description : Tick interruption handler
*/
// 节拍中断处理函数
LITE_OS_SEC_TEXT VOID OsTickHandler(VOID)
{
#ifdef LOSCFG_SCHED_TICK_DEBUG
OsSchedDebugRecordData();
#endif
#ifdef LOSCFG_KERNEL_VDSO
OsVdsoTimevalUpdate();
#endif
#ifdef LOSCFG_BASE_CORE_TICK_HW_TIME
HalClockIrqClear(); /* diff from every platform */
#endif
// 调度器的节拍处理函数
OsSchedTick();
}