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