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/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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函数意义
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g_sysClock：系统时钟频率，用于记录系统的时钟频率。
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g_tickPerSecond：每秒节拍数，用于记录每秒钟发生的节拍数。
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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。
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g_tickSpin：任务模块的自旋锁，用于保护对任务模块的访问。
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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。
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*/
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#include "los_tick_pri.h"
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#include "los_swtmr_pri.h"
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#include "los_sched_pri.h"
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#ifdef LOSCFG_KERNEL_VDSO
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#include "los_vdso.h"
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#endif
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// 系统时钟频率
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LITE_OS_SEC_DATA_INIT UINT32 g_sysClock;
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// 每秒节拍数
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LITE_OS_SEC_DATA_INIT UINT32 g_tickPerSecond;
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// 循环周期到纳秒的缩放比例
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LITE_OS_SEC_BSS DOUBLE g_cycle2NsScale;
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// 任务模块的自旋锁
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LITE_OS_SEC_BSS SPIN_LOCK_INIT(g_tickSpin);
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/*
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* Description : Tick interruption handler
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*/
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// 节拍中断处理函数
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LITE_OS_SEC_TEXT VOID OsTickHandler(VOID)
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{
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#ifdef LOSCFG_SCHED_TICK_DEBUG
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OsSchedDebugRecordData();
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#endif
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#ifdef LOSCFG_KERNEL_VDSO
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OsVdsoTimevalUpdate();
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#endif
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#ifdef LOSCFG_BASE_CORE_TICK_HW_TIME
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HalClockIrqClear(); /* diff from every platform */
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#endif
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// 调度器的节拍处理函数
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OsSchedTick();
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}
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