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- /*
- * 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 int length;
- unsigned int offset;
- 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_MIN_SPACE 0x8000
- #define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
- #define NVRAM_VERSION 1
- #define NVRAM_CRC_START_POSITION 9 /* magic, len, crc8 to be skipped */
- #endif /* _nvram_h_ */
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