/* * 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 #include #include #include #include #include #include #include #include #include #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_ */ plain) 
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