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/*
* NVRAM variable manipulation
*
* Copyright 2004, 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>
struct nvram_header {
uint32 magic;
uint32 len;
uint32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:27 init, mem. test 28, 29-31 reserved */
uint32 config_refresh; /* 0:15 config, 16:31 refresh */
uint32 config_ncdl; /* ncdl values for memc */
};
struct nvram_tuple {
char *name;
char *value;
struct nvram_tuple *next;
};
/*
* Initialize NVRAM access. May be unnecessary or undefined on certain
* platforms.
*/
extern int nvram_init(void *sbh);
/*
* Disable NVRAM access. May be unnecessary or undefined on certain
* platforms.
*/
extern void nvram_exit(void);
/*
* 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);
/*
* 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) ? : "")
#define nvram_safe_unset(name) ({ \
if(nvram_get(name)) \
nvram_unset(name); \
})
#define nvram_safe_set(name, value) ({ \
if(!nvram_get(name) || strcmp(nvram_get(name), value)) \
nvram_set(name, value); \
})
/*
* 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 *buf, int count);
#endif /* _LANGUAGE_ASSEMBLY */
#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
#define NVRAM_VERSION 1
#define NVRAM_HEADER_SIZE 20
#define NVRAM_SPACE 0x8000
#define FLASH_BASE 0xbfc00000 /* Extif core */
#define FLASH_MIN 0x00100000 /* Minimum flash size */
#define FLASH_MAX 0x00400000 /* Maximum flash size with extif */
#endif /* _bcmnvram_h_ */
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