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Diffstat (limited to 'include/environment.h')
| -rw-r--r-- | include/environment.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/include/environment.h b/include/environment.h new file mode 100644 index 00000000000..fe8465b9606 --- /dev/null +++ b/include/environment.h @@ -0,0 +1,83 @@ +/* + * (C) Copyright 2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _ENVIRONMENT_H_ +#define _ENVIRONMENT_H_ 1 + +/************************************************************************** + * + * 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 preceeded by a 32 bit CRC over the data part. + * + ************************************************************************** + */ + +#if defined(CFG_ENV_IS_IN_FLASH) +# ifndef CFG_ENV_ADDR +# define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET) +# endif +# ifndef CFG_ENV_OFFSET +# define CFG_ENV_OFFSET (CFG_ENV_ADDR - CFG_FLASH_BASE) +# endif +# if !defined(CFG_ENV_ADDR_REDUND) && defined(CFG_ENV_OFFSET_REDUND) +# define CFG_ENV_ADDR_REDUND (CFG_FLASH_BASE + CFG_ENV_OFFSET_REDUND) +# endif +# ifndef CFG_ENV_SIZE +# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE +# endif +# if defined(CFG_ENV_ADDR_REDUND) && !defined(CFG_ENV_SIZE_REDUND) +# define CFG_ENV_SIZE_REDUND CFG_ENV_SIZE +# endif +# if (CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \ + (CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN) +# define ENV_IS_EMBEDDED 1 +# endif +# if defined(CFG_ENV_ADDR_REDUND) || defined(CFG_ENV_OFFSET_REDUND) +# define CFG_REDUNDAND_ENVIRONMENT 1 +# endif +#endif /* CFG_ENV_IS_IN_FLASH */ + + +#ifdef CFG_REDUNDAND_ENVIRONMENT +# define ENV_HEADER_SIZE (sizeof(unsigned long) + 1) +#else +# define ENV_HEADER_SIZE (sizeof(unsigned long)) +#endif + + +#define ENV_SIZE (CFG_ENV_SIZE - ENV_HEADER_SIZE) + +typedef struct environment_s { + unsigned long crc; /* CRC32 over data bytes */ +#ifdef CFG_REDUNDAND_ENVIRONMENT + unsigned char flags; /* active/obsolete flags */ +#endif + unsigned char data[ENV_SIZE]; /* Environment data */ +} env_t; + +#endif /* _ENVIRONMENT_H_ */ |