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
20 /*
21 * A 32-bit ARC PROM pass arguments and environment as 32-bit pointer.
22 * These macro take care of sign extension.
23 */
24 #define prom_argv(index) ((char *) (long)argv[(index)])
25
26 static char *ignored[] = {
27 "ConsoleIn=",
28 "ConsoleOut=",
29 "SystemPartition=",
30 "OSLoader=",
31 "OSLoadPartition=",
32 "OSLoadFilename=",
33 "OSLoadOptions="
34 };
35
36 static char *used_arc[][2] = {
37 { "OSLoadPartition=", "root=" },
38 { "OSLoadOptions=", "" }
39 };
40
move_firmware_args(int argc,LONG * argv,char * cp)41 static char __init *move_firmware_args(int argc, LONG *argv, char *cp)
42 {
43 char *s;
44 int actr, i;
45
46 actr = 1; /* Always ignore argv[0] */
47
48 while (actr < argc) {
49 for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
50 int len = strlen(used_arc[i][0]);
51
52 if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
53 /* Ok, we want it. First append the replacement... */
54 strcat(cp, used_arc[i][1]);
55 cp += strlen(used_arc[i][1]);
56 /* ... and now the argument */
57 s = strchr(prom_argv(actr), '=');
58 if (s) {
59 s++;
60 strcpy(cp, s);
61 cp += strlen(s);
62 }
63 *cp++ = ' ';
64 break;
65 }
66 }
67 actr++;
68 }
69
70 return cp;
71 }
72
prom_init_cmdline(int argc,LONG * argv)73 void __init prom_init_cmdline(int argc, LONG *argv)
74 {
75 char *cp;
76 int actr, i;
77
78 actr = 1; /* Always ignore argv[0] */
79
80 cp = arcs_cmdline;
81 /*
82 * Move ARC variables to the beginning to make sure they can be
83 * overridden by later arguments.
84 */
85 cp = move_firmware_args(argc, argv, cp);
86
87 while (actr < argc) {
88 for (i = 0; i < ARRAY_SIZE(ignored); i++) {
89 int len = strlen(ignored[i]);
90
91 if (!strncmp(prom_argv(actr), ignored[i], len))
92 goto pic_cont;
93 }
94 /* Ok, we want it. */
95 strcpy(cp, prom_argv(actr));
96 cp += strlen(prom_argv(actr));
97 *cp++ = ' ';
98
99 pic_cont:
100 actr++;
101 }
102
103 if (cp != arcs_cmdline) /* get rid of trailing space */
104 --cp;
105 *cp = '\0';
106
107 #ifdef DEBUG_CMDLINE
108 printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
109 #endif
110 }
111