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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_
/**************************************************************************
*
* 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);
/* [re]set individual variables to their value in the default environment */
int set_default_vars(int nvars, char * const vars[]);
/* Import from binary representation into hash table */
int env_import(const char *buf, int check);
/*
* Check if variable "name" can be changed from oldval to newval,
* and if so, apply the changes (e.g. baudrate).
* When (flag & H_FORCE) is set, it does not print out any error
* message and forces overwriting of write-once variables.
*/
int env_check_apply(const char *name, const char *oldval,
const char *newval, int flag);
#endif /* DO_DEPS_ONLY */
#endif /* _ENVIRONMENT_H_ */
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