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