release/src-rt-6.x/linux/linux-2.6/arch/mips/mips-boards/generic/cmdline.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you can distribute it and/or modify it
   6  * under the terms of the GNU General Public License (Version 2) as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17  *
  18  * Kernel command line creation using the prom monitor (YAMON) argc/argv.
  19  */
  20 #include <linux/init.h>
  21 #include <linux/string.h>
  22
  23 #include <asm/bootinfo.h>
  24
  25 extern int prom_argc;
  26 extern int *_prom_argv;
  27
  28 /*
  29  * YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
  30  * This macro take care of sign extension.
  31  */
  32 #define prom_argv(index) ((char *)(long)_prom_argv[(index)])
  33
  34 char * __init prom_getcmdline(void)
  35 {
  36         return &(arcs_cmdline[0]);
  37 }
  38
  39
  40 void  __init prom_init_cmdline(void)
  41 {
  42         char *cp;
  43         int actr;
  44
  45         actr = 1; /* Always ignore argv[0] */
  46
  47         cp = &(arcs_cmdline[0]);
  48         while(actr < prom_argc) {
  49                 strcpy(cp, prom_argv(actr));
  50                 cp += strlen(prom_argv(actr));
  51                 *cp++ = ' ';
  52                 actr++;
  53         }
  54         if (cp != &(arcs_cmdline[0])) {
  55                 /* get rid of trailing space */
  56                 --cp;
  57                 *cp = '\0';
  58         }
  59 }