LXR linux/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 (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
  19char * __init prom_getcmdline(void)
  20{
  21        return arcs_cmdline;
  22}
  23
  24static char *ignored[] = {
  25        "ConsoleIn=",
  26        "ConsoleOut=",
  27        "SystemPartition=",
  28        "OSLoader=",
  29        "OSLoadPartition=",
  30        "OSLoadFilename=",
  31        "OSLoadOptions="
  32};
  33
  34static char *used_arc[][2] = {
  35        { "OSLoadPartition=", "root=" },
  36        { "OSLoadOptions=", "" }
  37};
  38
  39static 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 = strchr(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
  71void __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}
 109