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
  19#ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE
  20void __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
  47char * __init fw_getcmdline(void)
  48{
  49        return &(arcs_cmdline[0]);
  50}
  51
  52char *fw_getenv(char *envname)
  53{
  54        char *result = NULL;
  55
  56        if (_fw_envp != 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
  89unsigned 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}
 104