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 (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/*
  21 * A 32-bit ARC PROM pass arguments and environment as 32-bit pointer.
  22 * These macro take care of sign extension.
  23 */
  24#define prom_argv(index) ((char *) (long)argv[(index)])
  25
  26static char *ignored[] = {
  27        "ConsoleIn=",
  28        "ConsoleOut=",
  29        "SystemPartition=",
  30        "OSLoader=",
  31        "OSLoadPartition=",
  32        "OSLoadFilename=",
  33        "OSLoadOptions="
  34};
  35
  36static char *used_arc[][2] = {
  37        { "OSLoadPartition=", "root=" },
  38        { "OSLoadOptions=", "" }
  39};
  40
  41static char __init *move_firmware_args(int argc, LONG *argv, char *cp)
  42{
  43        char *s;
  44        int actr, i;
  45
  46        actr = 1; /* Always ignore argv[0] */
  47
  48        while (actr < argc) {
  49                for(i = 0; i < ARRAY_SIZE(used_arc); i++) {
  50                        int len = strlen(used_arc[i][0]);
  51
  52                        if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
  53                        /* Ok, we want it. First append the replacement... */
  54                                strcat(cp, used_arc[i][1]);
  55                                cp += strlen(used_arc[i][1]);
  56                                /* ... and now the argument */
  57                                s = strchr(prom_argv(actr), '=');
  58                                if (s) {
  59                                        s++;
  60                                        strcpy(cp, s);
  61                                        cp += strlen(s);
  62                                }
  63                                *cp++ = ' ';
  64                                break;
  65                        }
  66                }
  67                actr++;
  68        }
  69
  70        return cp;
  71}
  72
  73void __init prom_init_cmdline(int argc, LONG *argv)
  74{
  75        char *cp;
  76        int actr, i;
  77
  78        actr = 1; /* Always ignore argv[0] */
  79
  80        cp = arcs_cmdline;
  81        /*
  82         * Move ARC variables to the beginning to make sure they can be
  83         * overridden by later arguments.
  84         */
  85        cp = move_firmware_args(argc, argv, cp);
  86
  87        while (actr < argc) {
  88                for (i = 0; i < ARRAY_SIZE(ignored); i++) {
  89                        int len = strlen(ignored[i]);
  90
  91                        if (!strncmp(prom_argv(actr), ignored[i], len))
  92                                goto pic_cont;
  93                }
  94                /* Ok, we want it. */
  95                strcpy(cp, prom_argv(actr));
  96                cp += strlen(prom_argv(actr));
  97                *cp++ = ' ';
  98
  99        pic_cont:
 100                actr++;
 101        }
 102
 103        if (cp != arcs_cmdline)         /* get rid of trailing space */
 104                --cp;
 105        *cp = '\0';
 106
 107#ifdef DEBUG_CMDLINE
 108        printk(KERN_DEBUG "prom cmdline: %s\n", arcs_cmdline);
 109#endif
 110}
 111