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