gpxe/src/include/byteswap.h

   1 #ifndef ETHERBOOT_BYTESWAP_H
   2 #define ETHERBOOT_BYTESWAP_H
   3
   4 FILE_LICENCE ( GPL2_OR_LATER );
   5
   6 #include "endian.h"
   7 #include "bits/byteswap.h"
   8
   9 #define __bswap_constant_16(x) \
  10         ((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
  11                     (((uint16_t)(x) & 0xff00) >> 8)))
  12
  13 #define __bswap_constant_32(x) \
  14         ((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
  15                     (((uint32_t)(x) & 0x0000ff00U) <<  8) | \
  16                     (((uint32_t)(x) & 0x00ff0000U) >>  8) | \
  17                     (((uint32_t)(x) & 0xff000000U) >> 24)))
  18
  19 #define __bswap_constant_64(x) \
  20         ((uint64_t)((((uint64_t)(x) & 0x00000000000000ffULL) << 56) | \
  21                     (((uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
  22                     (((uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
  23                     (((uint64_t)(x) & 0x00000000ff000000ULL) <<  8) | \
  24                     (((uint64_t)(x) & 0x000000ff00000000ULL) >>  8) | \
  25                     (((uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
  26                     (((uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
  27                     (((uint64_t)(x) & 0xff00000000000000ULL) >> 56)))
  28
  29 #define __bswap_16(x) \
  30         ((uint16_t)(__builtin_constant_p(x) ? \
  31         __bswap_constant_16(x) : \
  32         __bswap_variable_16(x)))
  33
  34 #define __bswap_32(x) \
  35         ((uint32_t)(__builtin_constant_p(x) ? \
  36         __bswap_constant_32(x) : \
  37         __bswap_variable_32(x)))
  38
  39 #define __bswap_64(x) \
  40         ((uint64_t)(__builtin_constant_p(x) ? \
  41         __bswap_constant_64(x) : \
  42         __bswap_variable_64(x)))
  43
  44 #if __BYTE_ORDER == __LITTLE_ENDIAN
  45 #include "little_bswap.h"
  46 #endif
  47 #if __BYTE_ORDER == __BIG_ENDIAN
  48 #include "big_bswap.h"
  49 #endif
  50
  51 /* Make routines available to all */
  52 #define swap64(x)       __bswap_64(x)
  53 #define swap32(x)       __bswap_32(x)
  54 #define swap16(x)       __bswap_16(x)
  55 #define bswap_64(x)     __bswap_64(x)
  56 #define bswap_32(x)     __bswap_32(x)
  57 #define bswap_16(x)     __bswap_16(x)
  58
  59 #endif /* ETHERBOOT_BYTESWAP_H */