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 #ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE
  20 void __init fw_init_cmdline(void)
  21 {
  22         int i;
  23
  24         /* Validate command line parameters. */
  25         if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) {
  26                 fw_argc = 0;
  27                 _fw_argv = NULL;
  28         } else {
  29                 fw_argc = (fw_arg0 & 0x0000ffff);
  30                 _fw_argv = (int *)fw_arg1;
  31         }
  32
  33         /* Validate environment pointer. */
  34         if (fw_arg2 < CKSEG0)
  35                 _fw_envp = NULL;
  36         else
  37                 _fw_envp = (int *)fw_arg2;
  38
  39         for (i = 1; i < fw_argc; i++) {
  40                 strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
  41                 if (i < (fw_argc - 1))
  42                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
  43         }
  44 }
  45 #endif
  46
  47 char * __init fw_getcmdline(void)
  48 {
  49         return &(arcs_cmdline[0]);
  50 }
  51
  52 char *fw_getenv(char *envname)
  53 {
  54         char *result = NULL;
  55
  56         if (_fw_envp != NULL && fw_envp(0) != NULL) {
  57                 /*
  58                  * Return a pointer to the given environment variable.
  59                  * YAMON uses "name", "value" pairs, while U-Boot uses
  60                  * "name=value".
  61                  */
  62                 int i, yamon, index = 0;
  63
  64                 yamon = (strchr(fw_envp(index), '=') == NULL);
  65                 i = strlen(envname);
  66
  67                 while (fw_envp(index)) {
  68                         if (strncmp(envname, fw_envp(index), i) == 0) {
  69                                 if (yamon) {
  70                                         result = fw_envp(index + 1);
  71                                         break;
  72                                 } else if (fw_envp(index)[i] == '=') {
  73                                         result = fw_envp(index) + i + 1;
  74                                         break;
  75                                 }
  76                         }
  77
  78                         /* Increment array index. */
  79                         if (yamon)
  80                                 index += 2;
  81                         else
  82                                 index += 1;
  83                 }
  84         }
  85
  86         return result;
  87 }
  88
  89 unsigned long fw_getenvl(char *envname)
  90 {
  91         unsigned long envl = 0UL;
  92         char *str;
  93         int tmp;
  94
  95         str = fw_getenv(envname);
  96         if (str) {
  97                 tmp = kstrtoul(str, 0, &envl);
  98                 if (tmp)
  99                         envl = 0;
 100         }
 101
 102         return envl;
 103 }