124 lines
3.8 KiB
C
124 lines
3.8 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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* 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_ 1
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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(CFG_ENV_IS_IN_FLASH)
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# ifndef CFG_ENV_ADDR
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# define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
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# endif
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# ifndef CFG_ENV_OFFSET
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# define CFG_ENV_OFFSET (CFG_ENV_ADDR - CFG_FLASH_BASE)
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# endif
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# if !defined(CFG_ENV_ADDR_REDUND) && defined(CFG_ENV_OFFSET_REDUND)
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# define CFG_ENV_ADDR_REDUND (CFG_FLASH_BASE + CFG_ENV_OFFSET_REDUND)
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# endif
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# if defined(CFG_ENV_SECT_SIZE) || defined(CFG_ENV_SIZE)
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# ifndef CFG_ENV_SECT_SIZE
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# define CFG_ENV_SECT_SIZE CFG_ENV_SIZE
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# endif
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# ifndef CFG_ENV_SIZE
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# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
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# endif
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# else
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# error "Both CFG_ENV_SECT_SIZE and CFG_ENV_SIZE undefined"
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# endif
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# if defined(CFG_ENV_ADDR_REDUND) && !defined(CFG_ENV_SIZE_REDUND)
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# define CFG_ENV_SIZE_REDUND CFG_ENV_SIZE
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# endif
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# if (CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \
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(CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)
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# define ENV_IS_EMBEDDED 1
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# endif
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# if defined(CFG_ENV_ADDR_REDUND) || defined(CFG_ENV_OFFSET_REDUND)
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# define CFG_REDUNDAND_ENVIRONMENT 1
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# endif
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#endif /* CFG_ENV_IS_IN_FLASH */
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#if defined(CFG_ENV_IS_IN_NAND)
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# ifndef CFG_ENV_OFFSET
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# error "Need to define CFG_ENV_OFFSET when using CFG_ENV_IS_IN_NAND"
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# endif
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# ifndef CFG_ENV_SIZE
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# error "Need to define CFG_ENV_SIZE when using CFG_ENV_IS_IN_NAND"
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# endif
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# ifdef CFG_ENV_OFFSET_REDUND
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# define CFG_REDUNDAND_ENVIRONMENT
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# endif
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# ifdef CFG_ENV_IS_EMBEDDED
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# define ENV_IS_EMBEDDED 1
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# endif
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#endif /* CFG_ENV_IS_IN_NAND */
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#ifdef USE_HOSTCC
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# include <stdint.h>
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#else
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# include <linux/types.h>
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#endif
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#ifdef CFG_REDUNDAND_ENVIRONMENT
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# define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
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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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#define ENV_SIZE (CFG_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 CFG_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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/* 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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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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/* [re]set to the default environment */
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void set_default_env(void);
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#endif /* _ENVIRONMENT_H_ */
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