env_internal.h
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Internal environment header file. This includes direct access to environment
* information such as its size and offset, direct access to the default
* environment and embedded environment (if used). It also provides environment
* drivers with various declarations.
*
* It should not be included by board files, drivers and code other than that
* related to the environment implementation.
*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#ifndef _ENV_INTERNAL_H_
#define _ENV_INTERNAL_H_
#include <linux/kconfig.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 preceded by a 32 bit CRC over the data part.
*
*************************************************************************/
#if defined(CONFIG_ENV_IS_IN_FLASH)
# if defined(CONFIG_ENV_ADDR_REDUND) && \
((CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
(CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SIZE) <= \
(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
# define ENV_IS_EMBEDDED
# 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
# 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
# endif /* CONFIG_ENV_OFFSET_OOB */
#endif /* CONFIG_ENV_IS_IN_NAND */
/*
* 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)
#else
# define ENV_HEADER_SIZE (sizeof(uint32_t))
#endif
#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
/*
* If the environment is in RAM, allocate extra space for it in the malloc
* region.
*/
#if defined(CONFIG_ENV_IS_EMBEDDED)
#define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
#elif (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE < CONFIG_SYS_MONITOR_BASE) || \
(CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN) || \
defined(CONFIG_ENV_IS_IN_NVRAM)
#define TOTAL_MALLOC_LEN (CONFIG_SYS_MALLOC_LEN + CONFIG_ENV_SIZE)
#else
#define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
#endif
typedef struct environment_s {
uint32_t crc; /* CRC32 over data bytes */
#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
unsigned char flags; /* active/obsolete flags ENVF_REDUND_ */
#endif
unsigned char data[ENV_SIZE]; /* Environment data */
} env_t;
#ifdef ENV_IS_EMBEDDED
extern env_t embedded_environment;
#endif /* ENV_IS_EMBEDDED */
extern const unsigned char default_environment[];
#ifndef DO_DEPS_ONLY
#include <env_attr.h>
#include <env_callback.h>
#include <env_flags.h>
#include <search.h>
enum env_location {
ENVL_UNKNOWN,
ENVL_EEPROM,
ENVL_EXT4,
ENVL_FAT,
ENVL_FLASH,
ENVL_MMC,
ENVL_NAND,
ENVL_NVRAM,
ENVL_ONENAND,
ENVL_REMOTE,
ENVL_SPI_FLASH,
ENVL_UBI,
ENVL_NOWHERE,
ENVL_COUNT,
};
/* value for the various operations we want to perform on the env */
enum env_operation {
ENVOP_GET_CHAR, /* we want to call the get_char function */
ENVOP_INIT, /* we want to call the init function */
ENVOP_LOAD, /* we want to call the load function */
ENVOP_SAVE, /* we want to call the save function */
ENVOP_ERASE, /* we want to call the erase function */
};
struct env_driver {
const char *name;
enum env_location location;
/**
* load() - Load the environment from storage
*
* This method is optional. If not provided, no environment will be
* loaded.
*
* @return 0 if OK, -ve on error
*/
int (*load)(void);
/**
* save() - Save the environment to storage
*
* This method is required for 'saveenv' to work.
*
* @return 0 if OK, -ve on error
*/
int (*save)(void);
/**
* erase() - Erase the environment on storage
*
* This method is optional and required for 'eraseenv' to work.
*
* @return 0 if OK, -ve on error
*/
int (*erase)(void);
/**
* init() - Set up the initial pre-relocation environment
*
* This method is optional.
*
* @return 0 if OK, -ENOENT if no initial environment could be found,
* other -ve on error
*/
int (*init)(void);
};
/* Declare a new environment location driver */
#define U_BOOT_ENV_LOCATION(__name) \
ll_entry_declare(struct env_driver, __name, env_driver)
/* Declare the name of a location */
#ifdef CONFIG_CMD_SAVEENV
#define ENV_NAME(_name) .name = _name,
#else
#define ENV_NAME(_name)
#endif
#ifdef CONFIG_CMD_SAVEENV
#define env_save_ptr(x) x
#else
#define env_save_ptr(x) NULL
#endif
extern struct hsearch_data env_htab;
#endif /* DO_DEPS_ONLY */
#endif /* _ENV_INTERNAL_H_ */