include/envfs.h

   1 #ifndef _ENVFS_H
   2 #define _ENVFS_H
   3
   4 #include <asm/byteorder.h>
   5
   6 #define ENVFS_MAGIC                 0x798fba79  /* some random number */
   7 #define ENVFS_INODE_MAGIC       0x67a8c78d
   8 #define ENVFS_END_MAGIC         0x6a87d6cd
   9 #define ENVFS_SIGNATURE "barebox envfs"
  10
  11 struct envfs_inode {
  12         uint32_t magic; /* ENVFS_INODE_MAGIC */
  13         uint32_t size;  /* data size in bytes  */
  14         uint32_t namelen; /* The length of the filename _including_ a trailing 0 */
  15         char data[0];   /* The filename (zero terminated) + padding to 4 byte boundary
  16                          * followed by the data for this inode.
  17                          * The next inode follows after the data + padding to 4 byte
  18                          * boundary.
  19                          */
  20 };
  21
  22 /*
  23  * Superblock information at the beginning of the FS.
  24  */
  25 struct envfs_super {
  26         uint32_t magic;                 /* ENVFS_MAGIC */
  27         uint32_t priority;
  28         uint32_t crc;                   /* crc for the data */
  29         uint32_t size;                  /* size of data */
  30         uint32_t flags;                 /* feature flags */
  31         uint32_t future;                /* reserved for future use */
  32         uint32_t sb_crc;                /* crc for the superblock */
  33 };
  34
  35 #ifndef __BYTE_ORDER
  36 #error "No byte order defined in __BYTE_ORDER"
  37 #endif
  38
  39 #if __BYTE_ORDER == __LITTLE_ENDIAN
  40 #define ENVFS_16(x)     (x)
  41 #define ENVFS_24(x)     (x)
  42 #define ENVFS_32(x)     (x)
  43 #define ENVFS_GET_NAMELEN(x)    ((x)->namelen)
  44 #define ENVFS_GET_OFFSET(x)     ((x)->offset)
  45 #define ENVFS_SET_OFFSET(x,y)   ((x)->offset = (y))
  46 #define ENVFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
  47 #elif __BYTE_ORDER == __BIG_ENDIAN
  48 #ifdef __KERNEL__
  49 #define ENVFS_16(x)     swab16(x)
  50 #define ENVFS_24(x)     ((swab32(x)) >> 8)
  51 #define ENVFS_32(x)     swab32(x)
  52 #else /* not __KERNEL__ */
  53 #define ENVFS_16(x)     bswap_16(x)
  54 #define ENVFS_24(x)     ((bswap_32(x)) >> 8)
  55 #define ENVFS_32(x)     bswap_32(x)
  56 #endif /* not __KERNEL__ */
  57 #define ENVFS_GET_NAMELEN(x) ENVFS_32(((x)->namelen))
  58 #define ENVFS_GET_OFFSET(x)     ENVFS_32(((x)->offset))
  59 #define ENVFS_SET_NAMELEN(x,y)((x)->offset = ENVFS_32((y)))
  60 #define ENVFS_SET_OFFSET(x,y) ((x)->namelen = ENVFS_32((y)))
  61 #else
  62 #error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
  63 #endif
  64
  65 #endif /* _ENVFS_H */
  66