bootstr.c

ARM 嵌入式 系统 设计与实例开发 实验教材 二源码

/* $Id: bootstr.c,v 1.6 1999/08/31 06:55:01 davem Exp $
 * bootstr.c:  Boot string/argument acquisition from the PROM.
 *
 * Copyright(C) 1995 David S. Miller ([e-mail])
 * Copyright(C) 1996,1998 Jakub Jelinek ([e-mail])
 */

#include <linux/string.h>
#include <linux/init.h>
#include <asm/oplib.h>

#define BARG_LEN  256
int bootstr_len = BARG_LEN;
static int bootstr_valid = 0;
static char bootstr_buf[BARG_LEN] = { 0 };

char * __init
prom_getbootargs(void)
{
	/* This check saves us from a panic when bootfd patches args. */
	if (bootstr_valid) return bootstr_buf;
	prom_getstring(prom_chosen_node, "bootargs", bootstr_buf, BARG_LEN);
	bootstr_valid = 1;
	return bootstr_buf;
}