package/nvram/src/include/bcmnvram.h

   1 /*
   2  * NVRAM variable manipulation
   3  *
   4  * Copyright 2004, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  */
  13
  14 #ifndef _bcmnvram_h_
  15 #define _bcmnvram_h_
  16
  17 #ifndef _LANGUAGE_ASSEMBLY
  18
  19 #include <typedefs.h>
  20
  21 struct nvram_header {
  22         uint32 magic;
  23         uint32 len;
  24         uint32 crc_ver_init;    /* 0:7 crc, 8:15 ver, 16:27 init, mem. test 28, 29-31 reserved */
  25         uint32 config_refresh;  /* 0:15 config, 16:31 refresh */
  26         uint32 config_ncdl;     /* ncdl values for memc */
  27 };
  28
  29 struct nvram_tuple {
  30         char *name;
  31         char *value;
  32         struct nvram_tuple *next;
  33 };
  34
  35 /*
  36  * Initialize NVRAM access. May be unnecessary or undefined on certain
  37  * platforms.
  38  */
  39 extern int nvram_init(void *sbh);
  40
  41 /*
  42  * Disable NVRAM access. May be unnecessary or undefined on certain
  43  * platforms.
  44  */
  45 extern void nvram_exit(void);
  46
  47 /*
  48  * Get the value of an NVRAM variable. The pointer returned may be
  49  * invalid after a set.
  50  * @param       name    name of variable to get
  51  * @return      value of variable or NULL if undefined
  52  */
  53 extern char * nvram_get(const char *name);
  54
  55 /*
  56  * Get the value of an NVRAM variable.
  57  * @param       name    name of variable to get
  58  * @return      value of variable or NUL if undefined
  59  */
  60 #define nvram_safe_get(name) (nvram_get(name) ? : "")
  61
  62 #define nvram_safe_unset(name) ({ \
  63         if(nvram_get(name)) \
  64                 nvram_unset(name); \
  65 })
  66
  67 #define nvram_safe_set(name, value) ({ \
  68         if(!nvram_get(name) || strcmp(nvram_get(name), value)) \
  69                 nvram_set(name, value); \
  70 })
  71
  72 /*
  73  * Match an NVRAM variable.
  74  * @param       name    name of variable to match
  75  * @param       match   value to compare against value of variable
  76  * @return      TRUE if variable is defined and its value is string equal
  77  *              to match or FALSE otherwise
  78  */
  79 static INLINE int
  80 nvram_match(char *name, char *match) {
  81         const char *value = nvram_get(name);
  82         return (value && !strcmp(value, match));
  83 }
  84
  85 /*
  86  * Inversely match an NVRAM variable.
  87  * @param       name    name of variable to match
  88  * @param       match   value to compare against value of variable
  89  * @return      TRUE if variable is defined and its value is not string
  90  *              equal to invmatch or FALSE otherwise
  91  */
  92 static INLINE int
  93 nvram_invmatch(char *name, char *invmatch) {
  94         const char *value = nvram_get(name);
  95         return (value && strcmp(value, invmatch));
  96 }
  97
  98 /*
  99  * Set the value of an NVRAM variable. The name and value strings are
 100  * copied into private storage. Pointers to previously set values
 101  * may become invalid. The new value may be immediately
 102  * retrieved but will not be permanently stored until a commit.
 103  * @param       name    name of variable to set
 104  * @param       value   value of variable
 105  * @return      0 on success and errno on failure
 106  */
 107 extern int nvram_set(const char *name, const char *value);
 108
 109 /*
 110  * Unset an NVRAM variable. Pointers to previously set values
 111  * remain valid until a set.
 112  * @param       name    name of variable to unset
 113  * @return      0 on success and errno on failure
 114  * NOTE: use nvram_commit to commit this change to flash.
 115  */
 116 extern int nvram_unset(const char *name);
 117
 118 /*
 119  * Commit NVRAM variables to permanent storage. All pointers to values
 120  * may be invalid after a commit.
 121  * NVRAM values are undefined after a commit.
 122  * @return      0 on success and errno on failure
 123  */
 124 extern int nvram_commit(void);
 125
 126 /*
 127  * Get all NVRAM variables (format name=value\0 ... \0\0).
 128  * @param       buf     buffer to store variables
 129  * @param       count   size of buffer in bytes
 130  * @return      0 on success and errno on failure
 131  */
 132 extern int nvram_getall(char *buf, int count);
 133
 134 #endif /* _LANGUAGE_ASSEMBLY */
 135
 136 #define NVRAM_MAGIC             0x48534C46      /* 'FLSH' */
 137 #define NVRAM_VERSION           1
 138 #define NVRAM_HEADER_SIZE       20
 139 #define NVRAM_SPACE             0x8000
 140 #define FLASH_BASE              0xbfc00000      /* Extif core */
 141 #define FLASH_MIN               0x00100000      /* Minimum flash size */
 142 #define FLASH_MAX               0x00400000      /* Maximum flash size with extif */
 143
 144 #endif /* _bcmnvram_h_ */