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/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-04-19 Shell Fixup UP irq spinlock
* 2024-05-22 Shell Add UP cpu object and
* maintain the rt_current_thread inside it
*/
#include <rthw.h>
#include <rtthread.h>
static struct rt_cpu _cpu;
/**
* @brief Initialize a static spinlock object.
*
* @param lock is a pointer to the spinlock to initialize.
*/
void rt_spin_lock_init(struct rt_spinlock *lock)
{
RT_UNUSED(lock);
}
/**
* @brief This function will lock the spinlock, will lock the thread scheduler.
*
* @note If the spinlock is locked, the current CPU will keep polling the spinlock state
* until the spinlock is unlocked.
*
* @param lock is a pointer to the spinlock.
*/
void rt_spin_lock(struct rt_spinlock *lock)
{
rt_enter_critical();
RT_SPIN_LOCK_DEBUG(lock);
}
/**
* @brief This function will unlock the spinlock, will unlock the thread scheduler.
*
* @param lock is a pointer to the spinlock.
*/
void rt_spin_unlock(struct rt_spinlock *lock)
{
rt_base_t critical_level;
RT_SPIN_UNLOCK_DEBUG(lock, critical_level);
rt_exit_critical_safe(critical_level);
}
/**
* @brief This function will disable the local interrupt and then lock the spinlock, will lock the thread scheduler.
*
* @note If the spinlock is locked, the current CPU will keep polling the spinlock state
* until the spinlock is unlocked.
*
* @param lock is a pointer to the spinlock.
*
* @return Return current cpu interrupt status.
*/
rt_base_t rt_spin_lock_irqsave(struct rt_spinlock *lock)
{
rt_base_t level;
RT_UNUSED(lock);
level = rt_hw_interrupt_disable();
rt_enter_critical();
RT_SPIN_LOCK_DEBUG(lock);
return level;
}
/**
* @brief This function will unlock the spinlock and then restore current cpu interrupt status, will unlock the thread scheduler.
*
* @param lock is a pointer to the spinlock.
*
* @param level is interrupt status returned by rt_spin_lock_irqsave().
*/
void rt_spin_unlock_irqrestore(struct rt_spinlock *lock, rt_base_t level)
{
rt_base_t critical_level;
RT_SPIN_UNLOCK_DEBUG(lock, critical_level);
rt_exit_critical_safe(critical_level);
rt_hw_interrupt_enable(level);
}
/**
* @brief This fucntion will return current cpu object.
*
* @return Return a pointer to the current cpu object.
*/
struct rt_cpu *rt_cpu_self(void)
{
return &_cpu;
}
/**
* @brief This fucntion will return the cpu object corresponding to index.
*
* @param index is the index of target cpu object.
*
* @return Return a pointer to the cpu object corresponding to index.
*/
struct rt_cpu *rt_cpu_index(int index)
{
return index == 0 ? &_cpu : RT_NULL;
}
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