System Initialization

函数
void	rt_system_timer_init (void)
void	rt_system_timer_thread_init (void)
void	rt_application_init ()
void	rt_system_heap_init (void *begin_addr, void *end_addr)

详细描述

System initialization procedure.

When RT-Thread operating system starts up, the basic operating system facility initialization routines must be invoked.

The suggested initialization sequence is:

• initialize device hardware rt_hw_board_init();

User can put the low level hardware initialization in this function, such as DDR memory setting, pinmux setting, console device setting etc.

• show version rt_show_version();
• initialize timer system rt_system_timer_init();
• initialize system heap memory rt_system_heap_init(__bss_end, __end_of_memory);
• initialize module system rt_system_module_init();
• initialize scheduler system rt_system_scheduler_init();
• initialize application rt_application_init();
• initialize system timer thread rt_system_timer_thread_init();
• initialize idle thread rt_thread_idle_init();
• start scheduler rt_system_scheduler_start();

函数说明

rt_system_timer_init()

void rt_system_timer_init

(

void

)

This function will initialize system timer

在文件 timer.c 第 823 行定义.

{
#ifndef RT_USING_TIMER_ALL_SOFT
    rt_size_t i;
 
    for (i = 0; i < sizeof(_timer_list) / sizeof(_timer_list[0]); i++)
    {
        rt_list_init(_timer_list + i);
    }
 
    rt_spin_lock_init(&_htimer_lock);
#endif
}

引用了 rt_list_init() , 以及 rt_spin_lock_init().

函数调用图:

rt_system_timer_thread_init()

void rt_system_timer_thread_init

(

void

)

This function will initialize system timer thread

在文件 timer.c 第 842 行定义.

{
#ifdef RT_USING_TIMER_SOFT
    int i;
 
    for (i = 0;
         i < sizeof(_soft_timer_list) / sizeof(_soft_timer_list[0]);
         i++)
    {
        rt_list_init(_soft_timer_list + i);
    }
    rt_spin_lock_init(&_stimer_lock);
    rt_sem_init(&_soft_timer_sem, "stimer", 0, RT_IPC_FLAG_PRIO);
    rt_sem_control(&_soft_timer_sem, RT_IPC_CMD_SET_VLIMIT, (void*)1);
    /* start software timer thread */
    rt_thread_init(&_timer_thread,
                   "timer",
                   _timer_thread_entry,
                   RT_NULL,
                   &_timer_thread_stack[0],
                   sizeof(_timer_thread_stack),
                   RT_TIMER_THREAD_PRIO,
                   10);
 
    /* startup */
    rt_thread_startup(&_timer_thread);
#endif /* RT_USING_TIMER_SOFT */
}

引用了 RT_IPC_CMD_SET_VLIMIT, RT_IPC_FLAG_PRIO, rt_list_init(), RT_NULL, rt_sem_control(), rt_sem_init(), rt_spin_lock_init(), rt_thread_init() , 以及 rt_thread_startup().

函数调用图:

rt_application_init()

void rt_application_init

(

)

This function will initialize user application.

This function will be invoked when system initialization and system scheduler has not started. User can allocate memory, create thread, semaphore etc. However, user shall not suspend 'current' thread.

rt_system_heap_init()

void rt_system_heap_init	(	void *	begin_addr,
		void *	end_addr )

This function will init system heap. User can override this API to complete other works, like heap sanitizer initialization.

参数

begin_addr	the beginning address of system page.
end_addr	the end address of system page.

在文件 kservice.c 第 795 行定义.

{
    rt_system_heap_init_generic(begin_addr, end_addr);
}

引用了 rt_system_heap_init_generic().

函数调用图: