arch/mips/fw/lib/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  * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
   7  */
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11
  12 #include <asm/addrspace.h>
  13 #include <asm/fw/fw.h>
  14
  15 int fw_argc;
  16 int *_fw_argv;
  17 int *_fw_envp;
  18
  19 void __init fw_init_cmdline(void)
  20 {
  21         int i;
  22
  23         /* Validate command line parameters. */
  24         if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) {
  25                 fw_argc = 0;
  26                 _fw_argv = NULL;
  27         } else {
  28                 fw_argc = (fw_arg0 & 0x0000ffff);
  29                 _fw_argv = (int *)fw_arg1;
  30         }
  31
  32         /* Validate environment pointer. */
  33         if (fw_arg2 < CKSEG0)
  34                 _fw_envp = NULL;
  35         else
  36                 _fw_envp = (int *)fw_arg2;
  37
  38         for (i = 1; i < fw_argc; i++) {
  39                 strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
  40                 if (i < (fw_argc - 1))
  41                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
  42         }
  43 }
  44
  45 char * __init fw_getcmdline(void)
  46 {
  47         return &(arcs_cmdline[0]);
  48 }
  49
  50 char *fw_getenv(char *envname)
  51 {
  52         char *result = NULL;
  53
  54         if (_fw_envp != NULL) {
  55                 /*
  56                  * Return a pointer to the given environment variable.
  57                  * YAMON uses "name", "value" pairs, while U-Boot uses
  58                  * "name=value".
  59                  */
  60                 int i, yamon, index = 0;
  61
  62                 yamon = (strchr(fw_envp(index), '=') == NULL);
  63                 i = strlen(envname);
  64
  65                 while (fw_envp(index)) {
  66                         if (strncmp(envname, fw_envp(index), i) == 0) {
  67                                 if (yamon) {
  68                                         result = fw_envp(index + 1);
  69                                         break;
  70                                 } else if (fw_envp(index)[i] == '=') {
  71                                         result = fw_envp(index) + i + 1;
  72                                         break;
  73                                 }
  74                         }
  75
  76                         /* Increment array index. */
  77                         if (yamon)
  78                                 index += 2;
  79                         else
  80                                 index += 1;
  81                 }
  82         }
  83
  84         return result;
  85 }
  86
  87 unsigned long fw_getenvl(char *envname)
  88 {
  89         unsigned long envl = 0UL;
  90         char *str;
  91         int tmp;
  92
  93         str = fw_getenv(envname);
  94         if (str) {
  95                 tmp = kstrtoul(str, 0, &envl);
  96                 if (tmp)
  97                         envl = 0;
  98         }
  99
 100         return envl;
 101 }