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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* cmdline.c: Kernel command line creation using ARCS argc/argv.
*
* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
*/
#include <linux/bug.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/sgialib.h>
#include <asm/bootinfo.h>
#undef DEBUG_CMDLINE
/*
* A 32-bit ARC PROM pass arguments and environment as 32-bit pointer.
* These macro take care of sign extension.
*/
#define prom_argv(index) ((char *) (long)argv[(index)])
static char *ignored[] = {
"ConsoleIn=",
"ConsoleOut=",
"SystemPartition=",
"OSLoader=",
"OSLoadPartition=",
"OSLoadFilename=",
"OSLoadOptions="
};
static char *used_arc[][2] = {
{ "OSLoadPartition=", "root=" },
{ "OSLoadOptions=", "" }
};
static char __init *move_firmware_args(int argc, LONG *argv, char *cp)
{
char *s;
int actr, i;
actr = 1; /* Always ignore argv[0] */
while (actr < argc) {
for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
int len = strlen(used_arc[i][0]);
if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
/* Ok, we want it. First append the replacement... */
strcat(cp, used_arc[i][1]);
cp += strlen(used_arc[i][1]);
/* ... and now the argument */
s = strchr(prom_argv(actr), '=');
if (s) {
s++;
strcpy(cp, s);
cp += strlen(s);
}
*cp++ = ' ';
break;
}
}
actr++;
}
return cp;
}
void __init prom_init_cmdline(int argc, LONG *argv)
{
char *cp;
int actr, i;
actr = 1; /* Always ignore argv[0] */
cp = arcs_cmdline;
/*
* Move ARC variables to the beginning to make sure they can be
* overridden by later arguments.
*/
cp = move_firmware_args(argc, argv, cp);
while (actr < argc) {
for (i = 0; i < ARRAY_SIZE(ignored); i++) {
int len = strlen(ignored[i]);
if (!strncmp(prom_argv(actr), ignored[i], len))
goto pic_cont;
}
/* Ok, we want it. */
strcpy(cp, prom_argv(actr));
cp += strlen(prom_argv(actr));
*cp++ = ' ';
pic_cont:
actr++;
}
if (cp != arcs_cmdline) /* get rid of trailing space */
--cp;
*cp = '\0';
#ifdef DEBUG_CMDLINE
printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
#endif
}
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