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u-boot/include/env_internal.h
Marek Vasut de70e8879b env: Implement lower priority arch_env_get_location() 
Currently there is only one way to override desired environment location,
by implementing env_get_location(). This is increasingly being conflated
both on board level and architecture level, which leads to a problem on
boards where this function is already implemented on architecture level,
since those boards have no way to override this environment location on
board level anymore.

Implement arch_env_get_location() function which is architecture specific
and should only ever be implemented in architecture code. This function
has lower priority than env_get_location(), which should only ever be
implemented in board code, and which overrides the arch_env_get_location()
architecture environment selection.

This way, architecture can define its default environment chooser, while
board can now override it as needed at all times.

There is no functional change, since env_get_location() simply returns
arch_env_get_location(), and arch_env_get_location() implements the
current env_get_location() default content.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Adam Ford <aford173@gmail.com>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Marek Behún <marek.behun@nic.cz>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Tommaso Merciai <tomm.merciai@gmail.com>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
2022-04-21 09:08:40 -04:00

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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;
# 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 */
#ifdef DEFAULT_ENV_IS_RW
extern char default_environment[];
#else
extern const char default_environment[];
#endif
#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 required for loading environment
*
* @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
#define ENV_SAVE_PTR(x) (CONFIG_IS_ENABLED(SAVEENV) ? (x) : NULL)
#define ENV_ERASE_PTR(x) (CONFIG_IS_ENABLED(CMD_ERASEENV) ? (x) : NULL)
extern struct hsearch_data env_htab;
/**
* env_ext4_get_intf() - Provide the interface for env in EXT4
*
* It is a weak function allowing board to overidde the default interface for
* U-Boot env in EXT4: CONFIG_ENV_EXT4_INTERFACE
*
* Return: string of interface, empty if not supported
*/
const char *env_ext4_get_intf(void);
/**
* env_ext4_get_dev_part() - Provide the device and partition for env in EXT4
*
* It is a weak function allowing board to overidde the default device and
* partition used for U-Boot env in EXT4: CONFIG_ENV_EXT4_DEVICE_AND_PART
*
* Return: string of device and partition
*/
const char *env_ext4_get_dev_part(void);
/**
* arch_env_get_location()- Provide the best location for the U-Boot environment
*
* It is a weak function allowing board to overidde the environment location
* on architecture level. This has lower priority than env_get_location(),
* which can be defined on board level.
*
* @op: operations performed on the environment
* @prio: priority between the multiple environments, 0 being the
* highest priority
* Return: an enum env_location value on success, or -ve error code.
*/
enum env_location arch_env_get_location(enum env_operation op, int prio);
/**
* env_get_location()- Provide the best location for the U-Boot environment
*
* It is a weak function allowing board to overidde the environment location
* on board level. This has higher priority than arch_env_get_location(),
* which can be defined on architecture level.
*
* @op: operations performed on the environment
* @prio: priority between the multiple environments, 0 being the
* highest priority
* Return: an enum env_location value on success, or -ve error code.
*/
enum env_location env_get_location(enum env_operation op, int prio);
/**
* env_fat_get_intf() - Provide the interface for env in FAT
*
* It is a weak function allowing board to overidde the default interface for
* U-Boot env in FAT: CONFIG_ENV_FAT_INTERFACE
*
* Return: string of interface, empty if not supported
*/
const char *env_fat_get_intf(void);
/**
* env_fat_get_dev_part() - Provide the device and partition for env in FAT
*
* It is a weak function allowing board to overidde the default device and
* partition used for U-Boot env in FAT: CONFIG_ENV_FAT_DEVICE_AND_PART
*
* Return: string of device and partition
*/
char *env_fat_get_dev_part(void);
#endif /* DO_DEPS_ONLY */
#endif /* _ENV_INTERNAL_H_ */
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