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146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
/*
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* NVRAM variable manipulation
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*
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* Copyright 2004, 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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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, 16:27 init, mem. test 28, 29-31 reserved */
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uint32 config_refresh; /* 0:15 config, 16:31 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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* Initialize NVRAM access. May be unnecessary or undefined on certain
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* platforms.
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*/
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extern int nvram_init(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);
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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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* 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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#define nvram_safe_unset(name) ({ \
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if(nvram_get(name)) \
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nvram_unset(name); \
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})
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#define nvram_safe_set(name, value) ({ \
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if(!nvram_get(name) || strcmp(nvram_get(name), value)) \
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nvram_set(name, value); \
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})
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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 *buf, int count);
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#endif /* _LANGUAGE_ASSEMBLY */
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#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
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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 FLASH_BASE 0xbfc00000 /* Extif core */
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#define FLASH_MIN 0x00100000 /* Minimum flash size */
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#define FLASH_MAX 0x00400000 /* Maximum flash size with extif */
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#endif /* _bcmnvram_h_ */
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