/*
   * (C) Copyright 2002
   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *
   * See file CREDITS for list of people who contributed to this
   * project.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation; either version 2 of
   * the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
   * MA 02111-1307 USA
   */
  
  #ifndef _ENVIRONMENT_H_

  #define _ENVIRONMENT_H_

  
  /**************************************************************************
   *
   * The "environment" is stored as a list of '\0' terminated
   * "name=value" strings. The end of the list is marked by a double
   * '\0'. New entries are always added at the end. Deleting an entry
   * shifts the remaining entries to the front. Replacing an entry is a
   * combination of deleting the old value and adding the new one.
   *
   * The environment is preceeded by a 32 bit CRC over the data part.
   *
   **************************************************************************
   */

  #if defined(CONFIG_ENV_IS_IN_FLASH)

  # ifndef	CONFIG_ENV_ADDR
  #  define	CONFIG_ENV_ADDR	(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)

  # endif

  # ifndef	CONFIG_ENV_OFFSET
  #  define	CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)

  # endif

  # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)

  #  define	CONFIG_ENV_ADDR_REDUND	\
  		(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)

  # endif

  # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)

  #  ifndef	CONFIG_ENV_SECT_SIZE
  #   define	CONFIG_ENV_SECT_SIZE	CONFIG_ENV_SIZE

  #  endif

  #  ifndef	CONFIG_ENV_SIZE
  #   define	CONFIG_ENV_SIZE	CONFIG_ENV_SECT_SIZE

  #  endif
  # else

  #  error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"

  # endif

  # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  #  define CONFIG_ENV_SIZE_REDUND	CONFIG_ENV_SIZE

  # endif

  # if	(CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) &&		\
  	(CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <=			\
  	(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)

  #  define ENV_IS_EMBEDDED

  # endif

  # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)

  #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT

  # endif

  # ifdef CONFIG_ENV_IS_EMBEDDED
  #  error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
  #  error "it is calculated automatically for you"
  # endif

  #endif	/* CONFIG_ENV_IS_IN_FLASH */

  #if defined(CONFIG_ENV_IS_IN_NAND)

  # if defined(CONFIG_ENV_OFFSET_OOB)
  #  ifdef CONFIG_ENV_OFFSET_REDUND
  #   error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
  #   error "is set"
  #  endif
  extern unsigned long nand_env_oob_offset;
  #  define CONFIG_ENV_OFFSET nand_env_oob_offset
  # else
  #  ifndef CONFIG_ENV_OFFSET
  #   error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
  #  endif
  #  ifdef CONFIG_ENV_OFFSET_REDUND
  #   define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  #  endif
  # endif /* CONFIG_ENV_OFFSET_OOB */

  # ifndef CONFIG_ENV_SIZE
  #  error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"

  # endif

  #endif /* CONFIG_ENV_IS_IN_NAND */

  /* Embedded env is only supported for some flash types */
  #ifdef CONFIG_ENV_IS_EMBEDDED

  # if	!defined(CONFIG_ENV_IS_IN_FLASH)	&& \
  	!defined(CONFIG_ENV_IS_IN_NAND)		&& \
  	!defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
  	!defined(CONFIG_ENV_IS_IN_SPI_FLASH)

  #  error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
  # endif
  #endif
  
  /*
   * For the flash types where embedded env is supported, but it cannot be
   * calculated automatically (i.e. NAND), take the board opt-in.
   */
  #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)

  # define ENV_IS_EMBEDDED

  #endif
  
  /* The build system likes to know if the env is embedded */
  #ifdef DO_DEPS_ONLY
  # ifdef ENV_IS_EMBEDDED

  #  ifndef CONFIG_ENV_IS_EMBEDDED
  #   define CONFIG_ENV_IS_EMBEDDED
  #  endif

  # endif
  #endif

  #include "compiler.h"

  #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT

  # define ENV_HEADER_SIZE	(sizeof(uint32_t) + 1)

  
  # define ACTIVE_FLAG   1
  # define OBSOLETE_FLAG 0

  #else

  # define ENV_HEADER_SIZE	(sizeof(uint32_t))

  #endif

  #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
  extern char *env_name_spec;
  #endif

  #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)

  typedef struct environment_s {

  	uint32_t	crc;		/* CRC32 over data bytes	*/

  #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT

  	unsigned char	flags;		/* active/obsolete flags	*/
  #endif
  	unsigned char	data[ENV_SIZE]; /* Environment data		*/
  } env_t;

  #ifdef ENV_IS_EMBEDDED
  extern env_t environment;
  #endif /* ENV_IS_EMBEDDED */

  extern const unsigned char default_environment[];

  extern env_t *env_ptr;
  
  extern void env_relocate_spec(void);
  extern unsigned char env_get_char_spec(int);
  
  #if defined(CONFIG_NEEDS_MANUAL_RELOC)
  extern void env_reloc(void);
  #endif

  #ifndef DO_DEPS_ONLY
  
  #include <search.h>
  
  extern struct hsearch_data env_htab;

  /* Function that returns a character from the environment */

  unsigned char env_get_char(int);

  
  /* Function that returns a pointer to a value from the environment */

  const unsigned char *env_get_addr(int);

  unsigned char env_get_char_memory(int index);

  
  /* Function that updates CRC of the enironment */

  void env_crc_update(void);

  /* [re]set to the default environment */

  void set_default_env(const char *s);
  
  /* Import from binary representation into hash table */
  int env_import(const char *buf, int check);

  #endif /* DO_DEPS_ONLY */

  #endif /* _ENVIRONMENT_H_ */