[MIPS] IP32: Enable PCI bridges
[linux-2.6.git] / arch / mips / arc / cmdline.c
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 (dm@engr.sgi.com)
9  */
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13
14 #include <asm/sgialib.h>
15 #include <asm/bootinfo.h>
16
17 #undef DEBUG_CMDLINE
18
19 char * __init prom_getcmdline(void)
20 {
21         return arcs_cmdline;
22 }
23
24 static char *ignored[] = {
25         "ConsoleIn=",
26         "ConsoleOut=",
27         "SystemPartition=",
28         "OSLoader=",
29         "OSLoadPartition=",
30         "OSLoadFilename=",
31         "OSLoadOptions="
32 };
33
34 static char *used_arc[][2] = {
35         { "OSLoadPartition=", "root=" },
36         { "OSLoadOptions=", "" }
37 };
38
39 static char * __init move_firmware_args(char* cp)
40 {
41         char *s;
42         int actr, i;
43
44         actr = 1; /* Always ignore argv[0] */
45
46         while (actr < prom_argc) {
47                 for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
48                         int len = strlen(used_arc[i][0]);
49
50                         if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
51                         /* Ok, we want it. First append the replacement... */
52                                 strcat(cp, used_arc[i][1]);
53                                 cp += strlen(used_arc[i][1]);
54                                 /* ... and now the argument */
55                                 s = strstr(prom_argv(actr), "=");
56                                 if (s) {
57                                         s++;
58                                         strcpy(cp, s);
59                                         cp += strlen(s);
60                                 }
61                                 *cp++ = ' ';
62                                 break;
63                         }
64                 }
65                 actr++;
66         }
67
68         return cp;
69 }
70
71 void __init prom_init_cmdline(void)
72 {
73         char *cp;
74         int actr, i;
75
76         actr = 1; /* Always ignore argv[0] */
77
78         cp = arcs_cmdline;
79         /*
80          * Move ARC variables to the beginning to make sure they can be
81          * overridden by later arguments.
82          */
83         cp = move_firmware_args(cp);
84
85         while (actr < prom_argc) {
86                 for (i = 0; i < ARRAY_SIZE(ignored); i++) {
87                         int len = strlen(ignored[i]);
88
89                         if (!strncmp(prom_argv(actr), ignored[i], len))
90                                 goto pic_cont;
91                 }
92                 /* Ok, we want it. */
93                 strcpy(cp, prom_argv(actr));
94                 cp += strlen(prom_argv(actr));
95                 *cp++ = ' ';
96
97         pic_cont:
98                 actr++;
99         }
100
101         if (cp != arcs_cmdline)         /* get rid of trailing space */
102                 --cp;
103         *cp = '\0';
104
105 #ifdef DEBUG_CMDLINE
106         printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
107 #endif
108 }