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u-boot/include/environment.h
Simon Glass c595199194 env: Adjust the load() method to return an error 
The load() methods have inconsistent behaviour on error. Some of them load
an empty default environment. Some load an environment containing an error
message. Others do nothing.

As a step in the right direction, have the method return an error code.
Then the caller could handle this itself in a consistent way.

Signed-off-by: Simon Glass <sjg@chromium.org>
2017-08-16 08:31:24 -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
#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;
#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>
/* Value for environment validity */
enum env_valid {
ENV_INVALID, /* No valid environment */
ENV_VALID, /* First or only environment is valid */
ENV_REDUND, /* Redundant environment is valid */
};
enum env_location {
ENVL_DATAFLASH,
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,
ENVL_UNKNOWN,
};
struct env_driver {
const char *name;
enum env_location location;
/**
* get_char() - Read a character from the environment
*
* This method is optional. If not provided, a default implementation
* will read from gd->env_addr.
*
* @index: Index of character to read (0=first)
* @return character read, or -ve on error
*/
int (*get_char)(int index);
/**
* 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);
/**
* 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;
/* Function that updates CRC of the enironment */
void env_crc_update(void);
/* Look up the variable from the default environment */
char *env_get_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
/**
* env_driver_lookup_default() - Look up the default environment driver
*
* @return pointer to driver, or NULL if none (which should not happen)
*/
struct env_driver *env_driver_lookup_default(void);
/**
* env_get_char() - Get a character from the early environment
*
* This reads from the pre-relocation environemnt
*
* @index: Index of character to read (0 = first)
* @return character read, or -ve on error
*/
int env_get_char(int index);
/**
* env_load() - Load the environment from storage
*
* @return 0 if OK, -ve on error
*/
int env_load(void);
/**
* env_save() - Save the environment to storage
*
* @return 0 if OK, -ve on error
*/
int env_save(void);
#endif /* DO_DEPS_ONLY */
#endif /* _ENVIRONMENT_H_ */
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