1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * cmdline.c: Kernel command line creation using ARCS argc/argv.
7 *
8 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
9 */
10#include <linux/bug.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/string.h>
14
15#include <asm/sgialib.h>
16#include <asm/bootinfo.h>
17
18#undef DEBUG_CMDLINE
19
20static char *ignored[] = {
21	"ConsoleIn=",
22	"ConsoleOut=",
23	"SystemPartition=",
24	"OSLoader=",
25	"OSLoadPartition=",
26	"OSLoadFilename=",
27	"OSLoadOptions="
28};
29
30static char *used_arc[][2] = {
31	{ "OSLoadPartition=", "root=" },
32	{ "OSLoadOptions=", "" }
33};
34
35static char * __init move_firmware_args(char* cp)
36{
37	char *s;
38	int actr, i;
39
40	actr = 1; /* Always ignore argv[0] */
41
42	while (actr < prom_argc) {
43		for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
44			int len = strlen(used_arc[i][0]);
45
46			if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
47			/* Ok, we want it. First append the replacement... */
48				strcat(cp, used_arc[i][1]);
49				cp += strlen(used_arc[i][1]);
50				/* ... and now the argument */
51				s = strchr(prom_argv(actr), '=');
52				if (s) {
53					s++;
54					strcpy(cp, s);
55					cp += strlen(s);
56				}
57				*cp++ = ' ';
58				break;
59			}
60		}
61		actr++;
62	}
63
64	return cp;
65}
66
67void __init prom_init_cmdline(void)
68{
69	char *cp;
70	int actr, i;
71
72	actr = 1; /* Always ignore argv[0] */
73
74	cp = arcs_cmdline;
75	/*
76	 * Move ARC variables to the beginning to make sure they can be
77	 * overridden by later arguments.
78	 */
79	cp = move_firmware_args(cp);
80
81	while (actr < prom_argc) {
82		for (i = 0; i < ARRAY_SIZE(ignored); i++) {
83			int len = strlen(ignored[i]);
84
85			if (!strncmp(prom_argv(actr), ignored[i], len))
86				goto pic_cont;
87		}
88		/* Ok, we want it. */
89		strcpy(cp, prom_argv(actr));
90		cp += strlen(prom_argv(actr));
91		*cp++ = ' ';
92
93	pic_cont:
94		actr++;
95	}
96
97	if (cp != arcs_cmdline)		/* get rid of trailing space */
98		--cp;
99	*cp = '\0';
100
101#ifdef DEBUG_CMDLINE
102	printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
103#endif
104}
105