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/*
* (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_ 1
/**************************************************************************
*
* 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(CFG_ENV_IS_IN_FLASH)
# ifndef CFG_ENV_ADDR
# define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
# endif
# ifndef CFG_ENV_OFFSET
# define CFG_ENV_OFFSET (CFG_ENV_ADDR - CFG_FLASH_BASE)
# endif
# if !defined(CFG_ENV_ADDR_REDUND) && defined(CFG_ENV_OFFSET_REDUND)
# define CFG_ENV_ADDR_REDUND (CFG_FLASH_BASE + CFG_ENV_OFFSET_REDUND)
# endif
# if defined(CFG_ENV_SECT_SIZE) || defined(CFG_ENV_SIZE)
# ifndef CFG_ENV_SECT_SIZE
# define CFG_ENV_SECT_SIZE CFG_ENV_SIZE
# endif
# ifndef CFG_ENV_SIZE
# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
# endif
# else
# error "Both CFG_ENV_SECT_SIZE and CFG_ENV_SIZE undefined"
# endif
# if defined(CFG_ENV_ADDR_REDUND) && !defined(CFG_ENV_SIZE_REDUND)
# define CFG_ENV_SIZE_REDUND CFG_ENV_SIZE
# endif
# if (CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \
(CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)
# define ENV_IS_EMBEDDED 1
# endif
# if defined(CFG_ENV_ADDR_REDUND) || defined(CFG_ENV_OFFSET_REDUND)
# define CFG_REDUNDAND_ENVIRONMENT 1
# endif
#endif /* CFG_ENV_IS_IN_FLASH */
#if defined(CONFIG_ENV_IS_IN_NAND)
# ifndef CFG_ENV_OFFSET
# error "Need to define CFG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
# endif
# ifndef CFG_ENV_SIZE
# error "Need to define CFG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
# endif
# ifdef CFG_ENV_OFFSET_REDUND
# define CFG_REDUNDAND_ENVIRONMENT
# endif
# ifdef CFG_ENV_IS_EMBEDDED
# define ENV_IS_EMBEDDED 1
# endif
#endif /* CONFIG_ENV_IS_IN_NAND */
#ifdef USE_HOSTCC
# include <stdint.h>
#else
# include <linux/types.h>
#endif
#ifdef CFG_REDUNDAND_ENVIRONMENT
# define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
#else
# define ENV_HEADER_SIZE (sizeof(uint32_t))
#endif
#define ENV_SIZE (CFG_ENV_SIZE - ENV_HEADER_SIZE)
typedef struct environment_s {
uint32_t crc; /* CRC32 over data bytes */
#ifdef CFG_REDUNDAND_ENVIRONMENT
unsigned char flags; /* active/obsolete flags */
#endif
unsigned char data[ENV_SIZE]; /* Environment data */
} env_t;
/* 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 */
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(void);
#endif /* _ENVIRONMENT_H_ */
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