text: /*
   * 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.
   */
  
  #include "los_timer.h"
  #include "los_config.h"
  #include "los_tick.h"
  #include "los_arch_interrupt.h"
  #include "los_context.h"
  #include "los_sched.h"
  #include "los_debug.h"
  
  /* ****************************************************************************
  Function    : HalTickStart
  Description : Configure Tick Interrupt Start
  Input       : none
  output      : none
  return      : LOS_OK - Success , or LOS_ERRNO_TICK_CFG_INVALID - failed
  **************************************************************************** */
  WEAK UINT32 HalTickStart(OS_TICK_HANDLER handler)
  {
      UINT32 ret;
  
      if ((OS_SYS_CLOCK == 0) ||
          (LOSCFG_BASE_CORE_TICK_PER_SECOND == 0) ||
          (LOSCFG_BASE_CORE_TICK_PER_SECOND > OS_SYS_CLOCK)) {
          return LOS_ERRNO_TICK_CFG_INVALID;
      }
  
  #if (LOSCFG_USE_SYSTEM_DEFINED_INTERRUPT == 1)
  #if (OS_HWI_WITH_ARG == 1)
      OsSetVector(SysTick_IRQn, (HWI_PROC_FUNC)handler, NULL);
  #else
      OsSetVector(SysTick_IRQn, (HWI_PROC_FUNC)handler);
  #endif
  #endif
  
      g_sysClock = OS_SYS_CLOCK;
      g_cyclesPerTick = OS_SYS_CLOCK / LOSCFG_BASE_CORE_TICK_PER_SECOND;
  
      ret = SysTick_Config(LOSCFG_BASE_CORE_TICK_RESPONSE_MAX);
      if (ret == 1) {
          return LOS_ERRNO_TICK_PER_SEC_TOO_SMALL;
      }
  
      return LOS_OK;
  }
  
  WEAK VOID HalSysTickReload(UINT64 nextResponseTime)
  {
      SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
      SysTick->LOAD = (UINT32)(nextResponseTime - 1UL); /* set reload register */
      SysTick->VAL = 0UL; /* Load the SysTick Counter Value */
      NVIC_ClearPendingIRQ(SysTick_IRQn);
      SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
  }
  
  WEAK UINT64 HalGetTickCycle(UINT32 *period)
  {
      UINT32 hwCycle = 0;
      UINT32 intSave = LOS_IntLock();
      UINT32 val = SysTick->VAL;
      *period = SysTick->LOAD;
      if (val != 0) {
          hwCycle = *period - val;
      }
      LOS_IntRestore(intSave);
      return (UINT64)hwCycle;
  }
  
  WEAK VOID HalTickLock(VOID)
  {
      SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
  }
  
  WEAK VOID HalTickUnlock(VOID)
  {
      SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
  }
  
  UINT32 HalEnterSleep(VOID)
  {
      __DSB();
      __WFI();
      __ISB();
  
      return LOS_OK;
  }
  