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  1. #ifndef _LINUX_BYTEORDER_SWABB_H
  2. #define _LINUX_BYTEORDER_SWABB_H
  3.  
  4. /*
  5.  * linux/byteorder/swabb.h
  6.  * SWAp Bytes Bizarrely
  7.  *      swaHHXX[ps]?(foo)
  8.  *
  9.  * Support for obNUXIous pdp-endian and other bizarre architectures.
  10.  * Will Linux ever run on such ancient beasts? if not, this file
  11.  * will be but a programming pearl. Still, it's a reminder that we
  12.  * shouldn't be making too many assumptions when trying to be portable.
  13.  *
  14.  */
  15.  
  16. /*
  17.  * Meaning of the names I chose (vaxlinux people feel free to correct them):
  18.  * swahw32      swap 16-bit half-words in a 32-bit word
  19.  * swahb32      swap 8-bit halves of each 16-bit half-word in a 32-bit word
  20.  *
  21.  * No 64-bit support yet. I don't know NUXI conventions for long longs.
  22.  * I guarantee it will be a mess when it's there, though :->
  23.  * It will be even worse if there are conflicting 64-bit conventions.
  24.  * Hopefully, no one ever used 64-bit objects on NUXI machines.
  25.  *
  26.  */
  27.  
  28. #define ___swahw32(x) \
  29. ({ \
  30.         __u32 __x = (x); \
  31.         ((__u32)( \
  32.                 (((__u32)(__x) & (__u32)0x0000ffffUL) << 16) | \
  33.                 (((__u32)(__x) & (__u32)0xffff0000UL) >> 16) )); \
  34. })
  35. #define ___swahb32(x) \
  36. ({ \
  37.         __u32 __x = (x); \
  38.         ((__u32)( \
  39.                 (((__u32)(__x) & (__u32)0x00ff00ffUL) << 8) | \
  40.                 (((__u32)(__x) & (__u32)0xff00ff00UL) >> 8) )); \
  41. })
  42.  
  43. #define ___constant_swahw32(x) \
  44.         ((__u32)( \
  45.                 (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \
  46.                 (((__u32)(x) & (__u32)0xffff0000UL) >> 16) ))
  47. #define ___constant_swahb32(x) \
  48.         ((__u32)( \
  49.                 (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \
  50.                 (((__u32)(x) & (__u32)0xff00ff00UL) >> 8) ))
  51.  
  52. /*
  53.  * provide defaults when no architecture-specific optimization is detected
  54.  */
  55. #ifndef __arch__swahw32
  56. #  define __arch__swahw32(x) ___swahw32(x)
  57. #endif
  58. #ifndef __arch__swahb32
  59. #  define __arch__swahb32(x) ___swahb32(x)
  60. #endif
  61.  
  62. #ifndef __arch__swahw32p
  63. #  define __arch__swahw32p(x) __swahw32(*(x))
  64. #endif
  65. #ifndef __arch__swahb32p
  66. #  define __arch__swahb32p(x) __swahb32(*(x))
  67. #endif
  68.  
  69. #ifndef __arch__swahw32s
  70. #  define __arch__swahw32s(x) do { *(x) = __swahw32p((x)); } while (0)
  71. #endif
  72. #ifndef __arch__swahb32s
  73. #  define __arch__swahb32s(x) do { *(x) = __swahb32p((x)); } while (0)
  74. #endif
  75.  
  76.  
  77. /*
  78.  * Allow constant folding
  79.  */
  80. #if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
  81. #  define __swahw32(x) \
  82. (__builtin_constant_p((__u32)(x)) ? \
  83.  ___swahw32((x)) : \
  84.  __fswahw32((x)))
  85. #  define __swahb32(x) \
  86. (__builtin_constant_p((__u32)(x)) ? \
  87.  ___swahb32((x)) : \
  88.  __fswahb32((x)))
  89. #else
  90. #  define __swahw32(x) __fswahw32(x)
  91. #  define __swahb32(x) __fswahb32(x)
  92. #endif /* OPTIMIZE */
  93.  
  94.  
  95. static __inline__ __const__ __u32 __fswahw32(__u32 x)
  96. {
  97.         return __arch__swahw32(x);
  98. }
  99. static __inline__ __u32 __swahw32p(__u32 *x)
  100. {
  101.         return __arch__swahw32p(x);
  102. }
  103. static __inline__ void __swahw32s(__u32 *addr)
  104. {
  105.         __arch__swahw32s(addr);
  106. }
  107.  
  108.  
  109. static __inline__ __const__ __u32 __fswahb32(__u32 x)
  110. {
  111.         return __arch__swahb32(x);
  112. }
  113. static __inline__ __u32 __swahb32p(__u32 *x)
  114. {
  115.         return __arch__swahb32p(x);
  116. }
  117. static __inline__ void __swahb32s(__u32 *addr)
  118. {
  119.         __arch__swahb32s(addr);
  120. }
  121.  
  122. #ifdef __BYTEORDER_HAS_U64__
  123. /*
  124.  * Not supported yet
  125.  */
  126. #endif /* __BYTEORDER_HAS_U64__ */
  127.  
  128. #if defined(__KERNEL__)
  129. #define swahw32 __swahw32
  130. #define swahb32 __swahb32
  131. #define swahw32p __swahw32p
  132. #define swahb32p __swahb32p
  133. #define swahw32s __swahw32s
  134. #define swahb32s __swahb32s
  135. #endif
  136.  
  137. #endif /* _LINUX_BYTEORDER_SWABB_H */
  138.