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/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 static char *ignored[] = {
  21         "ConsoleIn=",
  22         "ConsoleOut=",
  23         "SystemPartition=",
  24         "OSLoader=",
  25         "OSLoadPartition=",
  26         "OSLoadFilename=",
  27         "OSLoadOptions="
  28 };
  29
  30 static char *used_arc[][2] = {
  31         { "OSLoadPartition=", "root=" },
  32         { "OSLoadOptions=", "" }
  33 };
  34
  35 static 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
  67 void __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 }