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://www.fayfayspace.org/license/LICENSE.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-02-26     Bernard      first implementation
 * 2006-05-05     Bernard      add two test thread
 */

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

#include <s3c4510.h>

char _irq_stack_start[128];
char _fiq_stack_start[128];
char _undefined_stack_start[64];
char _abort_stack_start[64];

extern void rt_hw_interrupt_init(void);
extern void rt_hw_board_init(void);
extern void rt_serial_init(void);
extern void rt_system_timer_init(void);
extern void rt_system_scheduler_init(void);
extern void rt_thread_idle_init(void);
extern void rt_hw_cpu_icache_enable(void);

/**
 * @addtogroup lumit4510
 */
/*@{*/

#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

/* clear .bss */
void rt_hw_clear_bss()
{
	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
}

void led_set(unsigned int led)
{
	IOPDATA = led;
}

/* led loop */
void led_flash()
{
	int i;

	led_set(1 << 4);
	for ( i = 0; i < 2000000; i++);
	
	led_set(1 << 5);
	for ( i = 0; i < 2000000; i++);
	
	led_set(1 << 6);
	for ( i = 0; i < 2000000; i++);

	led_set(1 << 17);
	for ( i = 0; i < 2000000; i++);
}

extern void finsh_system_init(void);
extern int  rt_application_init(void);

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

	/* enable cpu cache */
	rt_hw_cpu_icache_enable();
	rt_hw_cpu_dcache_enable();

	/* init hardware interrupt */
	rt_hw_interrupt_init();

	/* init board */
	rt_hw_board_init();

	/* init hardware serial */
	rt_serial_init();

	rt_kprintf("\nRT-Thread\n");

	/* init tick */
	rt_system_tick_init();

	/* init kernel object */
	rt_system_object_init();

	/* init timer system */
	rt_system_timer_init();

	/* init memory system */
	// rt_system_page_init();

	/* init scheduler system */
	rt_system_scheduler_init();

	/* set idle thread hook */
	rt_thread_idle_sethook(led_flash);

	/* init application */
	rt_application_init();

	/* init finsh */
	finsh_system_init();

	/* unmask interrupt */
	rt_hw_interrupt_umask(INTGLOBAL);

	/* init threads and start scheduler */
	rt_system_thread_init();

	/* never reach here */
	return ;
}

/*@}*/