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Diffstat (limited to 'package/utils/nvram/src/nvram.h')
| -rw-r--r-- | package/utils/nvram/src/nvram.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/package/utils/nvram/src/nvram.h b/package/utils/nvram/src/nvram.h new file mode 100644 index 0000000..724f33b --- /dev/null +++ b/package/utils/nvram/src/nvram.h @@ -0,0 +1,123 @@ +/* + * 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_ */ |