startup.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : startup.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Develop Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-02-26     Bernard      first implementation
 * 2006-05-05     Bernard      add two test thread
 * 2006-08-10     Bernard      use rt_show_version to display version information
 * 2006-09-09     Vai          Modified in NDS version	
 */

#include <rtthread.h>
#include <rthw.h>

#include "nds.h"

extern void rt_hw_interrupt_init(void);
extern void rt_hw_board_init(void);
extern void rt_video_init(void);
extern void rt_thread_idle_init(void);
extern void rt_system_timer_init(void);
extern void rt_system_scheduler_init(void);
extern void rt_system_heap_init(void* begin_addr, void* end_addr);
extern void rt_show_version(void);

#ifdef __CC_ARM

extern unsigned char* __bss_start;

extern unsigned char* __bss_end;
#else
extern unsigned char __bss_start;
extern unsigned char __bss_end;
#endif

/**
 * @addtogroup NDS
 */
/*@{*/

/* clear .bss */
void rt_hw_clear_bss(void)
{
	unsigned char *dst;

#ifdef __CC_ARM
	dst = (unsigned char*)__bss_start; 
	while (dst < (unsigned char*)__bss_end) *dst++ = 0;
#else
	dst = &__bss_start; 
	while (dst < &__bss_end) *dst++ = 0;
#endif
}

extern int  rt_application_init(void);
extern void rt_show_version();
extern void rt_system_heap_init(void* begin_addr, void* end_addr);

 /**
 * This function will startup RT-Thread RTOS.
 */
void rtthread_startup(void)
{
    /* clear .bss */
    rt_hw_clear_bss();

    /* init hardware interrupt */
    rt_hw_interrupt_init();

    /* init board */
    rt_hw_board_init();

    /* init video console */
    rt_video_init();

    rt_show_version();

    /* init tick */
    rt_system_tick_init();

    /* init kernel object */
    rt_system_object_init();

    /* init timer system */
    rt_system_timer_init();

    /* init memory system */
#ifdef RT_USING_HEAP
#ifdef __CC_ARM
	rt_system_heap_init((void*)__bss_end, 0x02400000);
#else
	rt_system_heap_init((void*)&__bss_end, (void*)0x02400000);
#endif
#endif

    /* init scheduler system */
    rt_system_scheduler_init();

    /* init application */
    rt_application_init();

    /* unmask interrupt */
    rt_hw_interrupt_umask(INTGLOBAL);

	/* init idle thread */
	rt_thread_idle_init();

    /* start scheduler */
    rt_system_scheduler_start();

    /* never reach here */
    return ;
}

/*@}*/