target/linux/adm5120/files-3.18/arch/mips/adm5120/prom/generic.c

   1 /*
   2  *  Generic PROM routines
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/bootinfo.h>
  17
  18 #include <prom/generic.h>
  19
  20 static int *_prom_argc;
  21 static char **_prom_argv;
  22 static char **_prom_envp;
  23
  24 char *generic_prom_getenv(char *envname)
  25 {
  26         char **env;
  27         char *ret;
  28
  29         ret = NULL;
  30         for (env = _prom_envp; *env != NULL; env++) {
  31                 if (strcmp(envname, *env++) == 0) {
  32                         ret = *env;
  33                         break;
  34                 }
  35         }
  36
  37         return ret;
  38 }
  39
  40 int generic_prom_present(void)
  41 {
  42         _prom_argc = (int *)fw_arg0;
  43         _prom_argv = (char **)fw_arg1;
  44         _prom_envp = (char **)fw_arg2;
  45
  46         return 1;
  47 }