LXR linux/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
  15int fw_argc;
  16int *_fw_argv;
  17int *_fw_envp;
  18
  19void __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
  45char * __init fw_getcmdline(void)
  46{
  47        return &(arcs_cmdline[0]);
  48}
  49
  50char *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
  87unsigned 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}
 102