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/* $Id: bootstr.c,v 1.20 2000/02/08 20:24:23 davem Exp $
* bootstr.c: Boot string/argument acquisition from the PROM.
*
* Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/string.h>
#include <asm/oplib.h>
#include <asm/sun4prom.h>
#include <linux/init.h>
#define BARG_LEN 256
static char barg_buf[BARG_LEN] = { 0 };
static char fetched __initdata = 0;
extern linux_sun4_romvec *sun4_romvec;
char * __init
prom_getbootargs(void)
{
int iter;
char *cp, *arg;
/* This check saves us from a panic when bootfd patches args. */
if (fetched) {
return barg_buf;
}
switch(prom_vers) {
case PROM_V0:
case PROM_SUN4:
cp = barg_buf;
/* Start from 1 and go over fd(0,0,0)kernel */
for(iter = 1; iter < 8; iter++) {
arg = (*(romvec->pv_v0bootargs))->argv[iter];
if(arg == 0) break;
while(*arg != 0) {
/* Leave place for space and null. */
if(cp >= barg_buf + BARG_LEN-2){
/* We might issue a warning here. */
break;
}
*cp++ = *arg++;
}
*cp++ = ' ';
}
*cp = 0;
break;
case PROM_V2:
case PROM_V3:
/*
* V3 PROM cannot supply as with more than 128 bytes
* of an argument. But a smart bootstrap loader can.
*/
strncpy(barg_buf, *romvec->pv_v2bootargs.bootargs, BARG_LEN-1);
break;
default:
break;
}
fetched = 1;
return barg_buf;
}
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