/*
 * 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,
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 * 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();
}