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https://github.com/brain-hackers/u-boot-brain
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c595199194
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>
340 lines
8.8 KiB
C
340 lines
8.8 KiB
C
/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ENVIRONMENT_H_
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#define _ENVIRONMENT_H_
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#include <linux/kconfig.h>
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/**************************************************************************
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*
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* The "environment" is stored as a list of '\0' terminated
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* "name=value" strings. The end of the list is marked by a double
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* '\0'. New entries are always added at the end. Deleting an entry
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* shifts the remaining entries to the front. Replacing an entry is a
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* combination of deleting the old value and adding the new one.
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*
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* The environment is preceded by a 32 bit CRC over the data part.
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*
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*************************************************************************/
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#if defined(CONFIG_ENV_IS_IN_FLASH)
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# ifndef CONFIG_ENV_ADDR
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# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
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# endif
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# ifndef CONFIG_ENV_OFFSET
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# define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
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# endif
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# if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
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# define CONFIG_ENV_ADDR_REDUND \
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(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
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# endif
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# if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
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# ifndef CONFIG_ENV_SECT_SIZE
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# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
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# endif
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# ifndef CONFIG_ENV_SIZE
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# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
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# endif
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# else
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# error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
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# endif
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# if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
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# define CONFIG_ENV_SIZE_REDUND CONFIG_ENV_SIZE
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# endif
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# if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
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(CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= \
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(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
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# define ENV_IS_EMBEDDED
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# endif
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# if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
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# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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# endif
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# ifdef CONFIG_ENV_IS_EMBEDDED
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# error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
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# error "it is calculated automatically for you"
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# endif
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#endif /* CONFIG_ENV_IS_IN_FLASH */
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#if defined(CONFIG_ENV_IS_IN_MMC)
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# ifdef CONFIG_ENV_OFFSET_REDUND
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# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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# endif
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#endif
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#if defined(CONFIG_ENV_IS_IN_NAND)
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# if defined(CONFIG_ENV_OFFSET_OOB)
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# ifdef CONFIG_ENV_OFFSET_REDUND
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# error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
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# error "is set"
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# endif
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extern unsigned long nand_env_oob_offset;
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# define CONFIG_ENV_OFFSET nand_env_oob_offset
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# else
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# ifndef CONFIG_ENV_OFFSET
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# error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
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# endif
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# ifdef CONFIG_ENV_OFFSET_REDUND
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# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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# endif
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# endif /* CONFIG_ENV_OFFSET_OOB */
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# ifndef CONFIG_ENV_SIZE
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# error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
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# endif
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#endif /* CONFIG_ENV_IS_IN_NAND */
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#if defined(CONFIG_ENV_IS_IN_UBI)
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# ifndef CONFIG_ENV_UBI_PART
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# error "Need to define CONFIG_ENV_UBI_PART when using CONFIG_ENV_IS_IN_UBI"
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# endif
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# ifndef CONFIG_ENV_UBI_VOLUME
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# error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
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# endif
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# if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
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# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
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# endif
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# ifndef CONFIG_ENV_SIZE
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# error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
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# endif
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# ifndef CONFIG_CMD_UBI
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# error "Need to define CONFIG_CMD_UBI when using CONFIG_ENV_IS_IN_UBI"
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# endif
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#endif /* CONFIG_ENV_IS_IN_UBI */
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/* Embedded env is only supported for some flash types */
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#ifdef CONFIG_ENV_IS_EMBEDDED
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# if !defined(CONFIG_ENV_IS_IN_FLASH) && \
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!defined(CONFIG_ENV_IS_IN_NAND) && \
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!defined(CONFIG_ENV_IS_IN_ONENAND) && \
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!defined(CONFIG_ENV_IS_IN_SPI_FLASH)
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# error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
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# endif
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#endif
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/*
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* For the flash types where embedded env is supported, but it cannot be
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* calculated automatically (i.e. NAND), take the board opt-in.
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*/
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#if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
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# define ENV_IS_EMBEDDED
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#endif
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/* The build system likes to know if the env is embedded */
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#ifdef DO_DEPS_ONLY
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# ifdef ENV_IS_EMBEDDED
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# ifndef CONFIG_ENV_IS_EMBEDDED
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# define CONFIG_ENV_IS_EMBEDDED
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# endif
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# endif
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#endif
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#include "compiler.h"
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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# define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
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# define ACTIVE_FLAG 1
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# define OBSOLETE_FLAG 0
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#else
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# define ENV_HEADER_SIZE (sizeof(uint32_t))
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#endif
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#ifdef CONFIG_ENV_AES
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/* Make sure the payload is multiple of AES block size */
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#define ENV_SIZE ((CONFIG_ENV_SIZE - ENV_HEADER_SIZE) & ~(16 - 1))
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#else
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#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
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#endif
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typedef struct environment_s {
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uint32_t crc; /* CRC32 over data bytes */
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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unsigned char flags; /* active/obsolete flags */
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#endif
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unsigned char data[ENV_SIZE]; /* Environment data */
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} env_t
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#ifdef CONFIG_ENV_AES
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/* Make sure the env is aligned to block size. */
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__attribute__((aligned(16)))
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#endif
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;
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#ifdef ENV_IS_EMBEDDED
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extern env_t environment;
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#endif /* ENV_IS_EMBEDDED */
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extern const unsigned char default_environment[];
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extern env_t *env_ptr;
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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extern void env_reloc(void);
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#endif
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#ifdef CONFIG_ENV_IS_IN_MMC
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#include <mmc.h>
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extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
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# ifdef CONFIG_SYS_MMC_ENV_PART
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extern uint mmc_get_env_part(struct mmc *mmc);
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# endif
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#endif
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#ifndef DO_DEPS_ONLY
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#include <env_attr.h>
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#include <env_callback.h>
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#include <env_flags.h>
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#include <search.h>
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/* Value for environment validity */
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enum env_valid {
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ENV_INVALID, /* No valid environment */
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ENV_VALID, /* First or only environment is valid */
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ENV_REDUND, /* Redundant environment is valid */
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};
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enum env_location {
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ENVL_DATAFLASH,
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ENVL_EEPROM,
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ENVL_EXT4,
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ENVL_FAT,
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ENVL_FLASH,
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ENVL_MMC,
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ENVL_NAND,
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ENVL_NVRAM,
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ENVL_ONENAND,
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ENVL_REMOTE,
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ENVL_SPI_FLASH,
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ENVL_UBI,
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ENVL_NOWHERE,
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ENVL_COUNT,
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ENVL_UNKNOWN,
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};
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struct env_driver {
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const char *name;
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enum env_location location;
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/**
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* get_char() - Read a character from the environment
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*
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* This method is optional. If not provided, a default implementation
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* will read from gd->env_addr.
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*
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* @index: Index of character to read (0=first)
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* @return character read, or -ve on error
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*/
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int (*get_char)(int index);
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/**
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* load() - Load the environment from storage
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*
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* This method is optional. If not provided, no environment will be
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* loaded.
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*
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* @return 0 if OK, -ve on error
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*/
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int (*load)(void);
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/**
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* save() - Save the environment to storage
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*
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* This method is required for 'saveenv' to work.
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*
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* @return 0 if OK, -ve on error
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*/
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int (*save)(void);
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/**
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* init() - Set up the initial pre-relocation environment
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*
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* This method is optional.
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*
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* @return 0 if OK, -ENOENT if no initial environment could be found,
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* other -ve on error
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*/
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int (*init)(void);
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};
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/* Declare a new environment location driver */
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#define U_BOOT_ENV_LOCATION(__name) \
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ll_entry_declare(struct env_driver, __name, env_driver)
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/* Declare the name of a location */
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#ifdef CONFIG_CMD_SAVEENV
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#define ENV_NAME(_name) .name = _name,
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#else
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#define ENV_NAME(_name)
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#endif
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#ifdef CONFIG_CMD_SAVEENV
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#define env_save_ptr(x) x
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#else
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#define env_save_ptr(x) NULL
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#endif
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extern struct hsearch_data env_htab;
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/* Function that updates CRC of the enironment */
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void env_crc_update(void);
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/* Look up the variable from the default environment */
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char *env_get_default(const char *name);
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/* [re]set to the default environment */
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void set_default_env(const char *s);
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/* [re]set individual variables to their value in the default environment */
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int set_default_vars(int nvars, char * const vars[]);
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/* Import from binary representation into hash table */
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int env_import(const char *buf, int check);
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/* Export from hash table into binary representation */
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int env_export(env_t *env_out);
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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/* Select and import one of two redundant environments */
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int env_import_redund(const char *buf1, const char *buf2);
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#endif
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/**
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* env_driver_lookup_default() - Look up the default environment driver
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*
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* @return pointer to driver, or NULL if none (which should not happen)
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*/
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struct env_driver *env_driver_lookup_default(void);
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/**
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* env_get_char() - Get a character from the early environment
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*
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* This reads from the pre-relocation environemnt
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*
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* @index: Index of character to read (0 = first)
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* @return character read, or -ve on error
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*/
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int env_get_char(int index);
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/**
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* env_load() - Load the environment from storage
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*
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* @return 0 if OK, -ve on error
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*/
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int env_load(void);
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/**
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* env_save() - Save the environment to storage
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*
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* @return 0 if OK, -ve on error
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*/
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int env_save(void);
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#endif /* DO_DEPS_ONLY */
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#endif /* _ENVIRONMENT_H_ */
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