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 }