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u-boot/include/environment.h
Fiach Antaw 76768f5f08 env: Add generic redundant environment implementation 
All current environments that implement redundancy use almost
identical implementations. This patch implements the env_nand
implementation as a function in env_common, and updates the
env_export function to export an env_nand-style 'flags' field by
default.

Signed-off-by: Fiach Antaw <fiach.antaw@uqconnect.edu.au>
Reviewed-by: Tom Rini <trini@konsulko.com>
2017-07-22 15:36:17 -04:00

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/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _ENVIRONMENT_H_
#define _ENVIRONMENT_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)
# 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_MMC)
# ifdef CONFIG_ENV_OFFSET_REDUND
# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
# endif
#endif
#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 */
#if defined(CONFIG_ENV_IS_IN_UBI)
# ifndef CONFIG_ENV_UBI_PART
# error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
# endif
# ifndef CONFIG_ENV_UBI_VOLUME
# error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
# endif
# if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
# endif
# ifndef CONFIG_ENV_SIZE
# error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
# endif
# ifndef CONFIG_CMD_UBI
# error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
# endif
#endif /* CONFIG_ENV_IS_IN_UBI */
/* 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
#ifdef CONFIG_ENV_AES
/* Make sure the payload is multiple of AES block size */
#define ENV_SIZE ((CONFIG_ENV_SIZE - ENV_HEADER_SIZE) & ~(16 - 1))
#else
#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
#endif
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 CONFIG_ENV_AES
/* Make sure the env is aligned to block size. */
__attribute__((aligned(16)))
#endif
;
#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
#ifdef CONFIG_ENV_IS_IN_MMC
#include <mmc.h>
extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
# ifdef CONFIG_SYS_MMC_ENV_PART
extern uint mmc_get_env_part(struct mmc *mmc);
# endif
#endif
#ifndef DO_DEPS_ONLY
#include <env_attr.h>
#include <env_callback.h>
#include <env_flags.h>
#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);
/* Look up the variable from the default environment */
char *getenv_default(const char *name);
/* [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);
/* Export from hash table into binary representation */
int env_export(env_t *env_out);
#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
/* Select and import one of two redundant environments */
int env_import_redund(const char *buf1, const char *buf2);
#endif
#endif /* DO_DEPS_ONLY */
#endif /* _ENVIRONMENT_H_ */
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