mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-24 07:51:55 +02:00
fad131f967
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15437 3c298f89-4303-0410-b956-a3cf2f4a3e73
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/*
|
|
* NVRAM variable manipulation
|
|
*
|
|
* Copyright 2007, Broadcom Corporation
|
|
* Copyright 2009, OpenWrt.org
|
|
* 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 _nvram_h_
|
|
#define _nvram_h_
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <linux/limits.h>
|
|
|
|
#include "sdinitvals.h"
|
|
|
|
|
|
struct nvram_header {
|
|
uint32_t magic;
|
|
uint32_t len;
|
|
uint32_t crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
|
|
uint32_t config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
|
|
uint32_t config_ncdl; /* ncdl values for memc */
|
|
} __attribute__((__packed__));
|
|
|
|
struct nvram_tuple {
|
|
char *name;
|
|
char *value;
|
|
struct nvram_tuple *next;
|
|
};
|
|
|
|
struct nvram_handle {
|
|
int fd;
|
|
char *mmap;
|
|
unsigned long length;
|
|
struct nvram_tuple *nvram_hash[257];
|
|
struct nvram_tuple *nvram_dead;
|
|
};
|
|
|
|
typedef struct nvram_handle nvram_handle_t;
|
|
typedef struct nvram_header nvram_header_t;
|
|
typedef struct nvram_tuple nvram_tuple_t;
|
|
|
|
|
|
/* Get nvram header. */
|
|
nvram_header_t * nvram_header(nvram_handle_t *h);
|
|
|
|
/* Set the value of an NVRAM variable */
|
|
int nvram_set(nvram_handle_t *h, const char *name, const char *value);
|
|
|
|
/* Get the value of an NVRAM variable. */
|
|
char * nvram_get(nvram_handle_t *h, const char *name);
|
|
|
|
/* Unset the value of an NVRAM variable. */
|
|
int nvram_unset(nvram_handle_t *h, const char *name);
|
|
|
|
/* Get all NVRAM variables. */
|
|
nvram_tuple_t * nvram_getall(nvram_handle_t *h);
|
|
|
|
/* Regenerate NVRAM. */
|
|
int nvram_commit(nvram_handle_t *h);
|
|
|
|
/* Open NVRAM and obtain a handle. */
|
|
nvram_handle_t * nvram_open(const char *file, int rdonly);
|
|
|
|
/* Close NVRAM and free memory. */
|
|
int nvram_close(nvram_handle_t *h);
|
|
|
|
/* Get the value of an NVRAM variable in a safe way, use "" instead of NULL. */
|
|
#define nvram_safe_get(h, name) (nvram_get(h, name) ? : "")
|
|
|
|
/* Computes a crc8 over the input data. */
|
|
uint8_t hndcrc8 (uint8_t * pdata, uint32_t nbytes, uint8_t crc);
|
|
|
|
/* Returns the crc value of the nvram. */
|
|
uint8_t nvram_calc_crc(nvram_header_t * nvh);
|
|
|
|
/* Determine NVRAM device node. */
|
|
char * nvram_find_mtd(void);
|
|
|
|
/* Copy NVRAM contents to staging file. */
|
|
int nvram_to_staging(void);
|
|
|
|
/* Copy staging file to NVRAM device. */
|
|
int staging_to_nvram(void);
|
|
|
|
/* Check NVRAM staging file. */
|
|
char * nvram_find_staging(void);
|
|
|
|
|
|
/* Staging file for NVRAM */
|
|
#define NVRAM_STAGING "/tmp/.nvram"
|
|
#define NVRAM_RO 1
|
|
#define NVRAM_RW 0
|
|
|
|
/* Helper macros */
|
|
#define NVRAM_ARRAYSIZE(a) sizeof(a)/sizeof(a[0])
|
|
#define NVRAM_ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
|
|
|
|
/* NVRAM constants */
|
|
#define NVRAM_SPACE 0x8000
|
|
#define NVRAM_START(x) x - NVRAM_SPACE
|
|
#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
|
|
#define NVRAM_VERSION 1
|
|
|
|
#define NVRAM_CRC_START_POSITION 9 /* magic, len, crc8 to be skipped */
|
|
|
|
|
|
#endif /* _nvram_h_ */
|