startup.c.svn-base

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
 */

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

#include <s3c2410.h>

rt_uint8 _irq_stack_start[128];
rt_uint8 _fiq_stack_start[128];
rt_uint8 _undefined_stack_start[64];
rt_uint8 _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);
extern void rt_show_version(void);
extern void rt_system_page_init(void*, void*);

/**
 * @addtogroup s3ceb2410
 */

/*@{*/

#ifdef __CC_ARM
	extern rt_uint8* __bss_start;
	extern rt_uint8* __bss_end;
#else
	extern rt_uint8 __bss_start;
	extern rt_uint8 __bss_end;
#endif

/* clear .bss */
void rt_hw_clear_bss(void)
{
	rt_uint8 *dst;

#ifdef __CC_ARM
	dst = (rt_uint8*)__bss_start; 
	while (dst < (rt_uint8*)__bss_end) *dst++ = 0;
#else
	dst = &__bss_start; 
	while (dst < &__bss_end) *dst++ = 0;
#endif
}

/*
 * 4 LEDs on S3CEB2410 : GPF4~GPF7
 */
void led_set(rt_uint32 led)
{
	GPFDAT = led;
}

/* led loop */
void led_flash(void)
{
	rt_uint32 i;

	/* change the pin mux to enable the LED output */
	GPFCON = 0x5500;

	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++);
}

#ifdef RT_USING_FINSH
extern void finsh_system_init(void);
#endif

extern rt_uint32  rt_application_init(void);

/**
 * This function will startup RT-Thread RTOS.
 */
void rtthread_startup(void)
{
	/* 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_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 __CC_ARM
	rt_system_page_init((void*)__bss_end, (void*)0x1000000);
#else
	rt_system_page_init(&__bss_end, (void*)0x1000000);
#endif

	/* init scheduler system */
	rt_system_scheduler_init();

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

	/* init application */
	rt_application_init();

	/* init finsh */
#ifdef RT_USING_FINSH
	finsh_system_init();
#endif

	/* unmask interrupt */
	rt_hw_interrupt_umask(INTGLOBAL);

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

	/* never reach here */
	return ;
}

/*@}*/