mirror of https://github.com/hak5/openwrt.git
169 lines
4.5 KiB
C
169 lines
4.5 KiB
C
/*
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* NVRAM variable manipulation
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*
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* Copyright 2007, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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* $Id$
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*/
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#ifndef _bcmnvram_h_
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#define _bcmnvram_h_
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#ifndef _LANGUAGE_ASSEMBLY
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#include <typedefs.h>
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#include <bcmdefs.h>
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struct nvram_header {
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uint32 magic;
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uint32 len;
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uint32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
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uint32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
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uint32 config_ncdl; /* ncdl values for memc */
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};
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struct nvram_tuple {
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char *name;
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char *value;
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struct nvram_tuple *next;
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};
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/*
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* Get default value for an NVRAM variable
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*/
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extern char *nvram_default_get(const char *name);
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/*
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* Append a chunk of nvram variables to the global list
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*/
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extern int nvram_append(void *sb, char *vars, uint varsz);
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/*
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* Check for reset button press for restoring factory defaults.
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*/
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extern bool nvram_reset(void *sbh);
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/*
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* Disable NVRAM access. May be unnecessary or undefined on certain
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* platforms.
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*/
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extern void nvram_exit(void *sbh);
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/*
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* Get the value of an NVRAM variable. The pointer returned may be
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* invalid after a set.
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* @param name name of variable to get
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* @return value of variable or NULL if undefined
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*/
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extern char * nvram_get(const char *name);
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/*
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* Read the reset GPIO value from the nvram and set the GPIO
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* as input
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*/
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extern int BCMINITFN(nvram_resetgpio_init)(void *sbh);
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/*
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* Get the value of an NVRAM variable.
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* @param name name of variable to get
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* @return value of variable or NUL if undefined
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*/
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#define nvram_safe_get(name) (nvram_get(name) ? : "")
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/*
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* Match an NVRAM variable.
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* @param name name of variable to match
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* @param match value to compare against value of variable
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* @return TRUE if variable is defined and its value is string equal
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* to match or FALSE otherwise
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*/
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static INLINE int
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nvram_match(char *name, char *match) {
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const char *value = nvram_get(name);
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return (value && !strcmp(value, match));
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}
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/*
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* Inversely match an NVRAM variable.
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* @param name name of variable to match
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* @param match value to compare against value of variable
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* @return TRUE if variable is defined and its value is not string
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* equal to invmatch or FALSE otherwise
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*/
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static INLINE int
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nvram_invmatch(char *name, char *invmatch) {
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const char *value = nvram_get(name);
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return (value && strcmp(value, invmatch));
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}
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/*
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* Set the value of an NVRAM variable. The name and value strings are
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* copied into private storage. Pointers to previously set values
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* may become invalid. The new value may be immediately
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* retrieved but will not be permanently stored until a commit.
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* @param name name of variable to set
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* @param value value of variable
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* @return 0 on success and errno on failure
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*/
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extern int nvram_set(const char *name, const char *value);
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/*
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* Unset an NVRAM variable. Pointers to previously set values
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* remain valid until a set.
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* @param name name of variable to unset
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* @return 0 on success and errno on failure
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* NOTE: use nvram_commit to commit this change to flash.
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*/
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extern int nvram_unset(const char *name);
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/*
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* Commit NVRAM variables to permanent storage. All pointers to values
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* may be invalid after a commit.
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* NVRAM values are undefined after a commit.
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* @return 0 on success and errno on failure
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*/
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extern int nvram_commit(void);
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/*
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* Get all NVRAM variables (format name=value\0 ... \0\0).
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* @param buf buffer to store variables
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* @param count size of buffer in bytes
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* @return 0 on success and errno on failure
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*/
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extern int nvram_getall(char *nvram_buf, int count);
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/*
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* returns the crc value of the nvram
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* @param nvh nvram header pointer
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*/
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extern uint8 nvram_calc_crc(struct nvram_header * nvh);
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extern char* getvar(char *vars, const char *name);
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extern int getintvar(char *vars, const char *name);
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#endif /* _LANGUAGE_ASSEMBLY */
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/* The NVRAM version number stored as an NVRAM variable */
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#define NVRAM_SOFTWARE_VERSION "1"
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#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
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#define NVRAM_CLEAR_MAGIC 0x0
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#define NVRAM_INVALID_MAGIC 0xFFFFFFFF
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#define NVRAM_VERSION 1
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#define NVRAM_HEADER_SIZE 20
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#define NVRAM_SPACE 0x8000
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#define NVRAM_MAX_VALUE_LEN 255
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#define NVRAM_MAX_PARAM_LEN 64
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#define NVRAM_CRC_START_POSITION 9 /* magic, len, crc8 to be skipped */
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#define NVRAM_CRC_VER_MASK 0xffffff00 /* for crc_ver_init */
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#endif /* _bcmnvram_h_ */
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