startup.c

来自「I wrote this code early this year using 」· C语言 代码 · 共 58 行

/*
 * File:	startup.c
 * Purpose: Generic application startup code
 *
 * Notes:	
 */

#include "common.h"

/********************************************************************/
void
startup(void)
{
	extern char __DATA_ROM[];
	extern char __DATA_RAM[];
	extern char __DATA_END[];
	extern char __BSS_START[];
	extern char __BSS_END[];
	extern uint32 VECTOR_TABLE[];
	extern uint32 __VECTOR_RAM[];
	register uint32 n;
	register uint8 *dp, *sp;

	/* 
     * Copy the vector table to RAM 
     */
	if (__VECTOR_RAM != VECTOR_TABLE)
	{
		for (n = 0; n < 256; n++)
			__VECTOR_RAM[n] = VECTOR_TABLE[n];
	}
	mcf5xxx_wr_vbr((uint32)__VECTOR_RAM);

	/* 
	 * Move initialized data from ROM to RAM. 
	 */
	if (__DATA_ROM != __DATA_RAM)
	{
		dp = (uint8 *)__DATA_RAM;
		sp = (uint8 *)__DATA_ROM;
		n = __DATA_END - __DATA_RAM;
		while (n--)
			*dp++ = *sp++;
	}
 
	/* 
	 * Zero uninitialized data 
	 */
	if (__BSS_START != __BSS_END)
	{
		sp = (uint8 *)__BSS_START;
		n = __BSS_END - __BSS_START;
		while (n--)
			*sp++ = 0;
	}
}
/********************************************************************/