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https://source.denx.de/u-boot/u-boot.git
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267541f776
Add support for read-only, write-once, and change-default. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
199 lines
6.1 KiB
C
199 lines
6.1 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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _ENVIRONMENT_H_
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#define _ENVIRONMENT_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 preceeded by a 32 bit CRC over the data part.
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*
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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_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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/* 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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#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
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extern char *env_name_spec;
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#endif
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#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
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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 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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extern void env_relocate_spec(void);
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extern unsigned char env_get_char_spec(int);
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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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#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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extern struct hsearch_data env_htab;
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/* Function that returns a character from the environment */
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unsigned char env_get_char(int);
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/* Function that returns a pointer to a value from the environment */
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const unsigned char *env_get_addr(int);
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unsigned char env_get_char_memory(int index);
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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 *getenv_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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#endif /* DO_DEPS_ONLY */
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#endif /* _ENVIRONMENT_H_ */
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