StdLib/Include/sys/bswap.h

   1 /*      $NetBSD: bswap.h,v 1.12 2006/05/22 16:28:27 drochner Exp $      */
   2
   3 /* Written by Manuel Bouyer. Public domain */
   4
   5 #ifndef _SYS_BSWAP_H_
   6 #define _SYS_BSWAP_H_
   7
   8 #ifndef _LOCORE
   9 #include  <sys/EfiCdefs.h>
  10 #include  <sys/types.h>
  11
  12 #include  <machine/bswap.h>
  13
  14 __BEGIN_DECLS
  15 /* Always declare the functions in case their address is taken (etc) */
  16 #if !defined(__BSWAP_RENAME)
  17 uint16_t bswap16(uint16_t) __attribute__((__const__));
  18 uint32_t bswap32(uint32_t) __attribute__((__const__));
  19 #else
  20 uint16_t bswap16(uint16_t) __RENAME(__bswap16) __attribute__((__const__));
  21 uint32_t bswap32(uint32_t) __RENAME(__bswap32) __attribute__((__const__));
  22 #endif
  23 uint64_t bswap64(uint64_t) __attribute__((__const__));
  24 __END_DECLS
  25
  26 #if defined(__GNUC__) && defined(__OPTIMIZE__)
  27
  28 /* machine/byte_swap.h might have defined inline versions */
  29 #ifndef __BYTE_SWAP_U64_VARIABLE
  30 #define __BYTE_SWAP_U64_VARIABLE bswap64
  31 #endif
  32
  33 #ifndef __BYTE_SWAP_U32_VARIABLE
  34 #define __BYTE_SWAP_U32_VARIABLE bswap32
  35 #endif
  36
  37 #ifndef __BYTE_SWAP_U16_VARIABLE
  38 #define __BYTE_SWAP_U16_VARIABLE bswap16
  39 #endif
  40
  41 #define __byte_swap_u64_constant(x) \
  42   ((uint64_t) \
  43    ((((x) & 0xff00000000000000ull) >> 56) | \
  44     (((x) & 0x00ff000000000000ull) >> 40) | \
  45     (((x) & 0x0000ff0000000000ull) >> 24) | \
  46     (((x) & 0x000000ff00000000ull) >>  8) | \
  47     (((x) & 0x00000000ff000000ull) <<  8) | \
  48     (((x) & 0x0000000000ff0000ull) << 24) | \
  49     (((x) & 0x000000000000ff00ull) << 40) | \
  50     (((x) & 0x00000000000000ffull) << 56)))
  51
  52 #define __byte_swap_u32_constant(x) \
  53   ((((x) & 0xff000000) >> 24) | \
  54    (((x) & 0x00ff0000) >>  8) | \
  55    (((x) & 0x0000ff00) <<  8) | \
  56    (((x) & 0x000000ff) << 24))
  57
  58 #define __byte_swap_u16_constant(x) \
  59   ((((x) & 0xff00) >> 8) | \
  60    (((x) & 0x00ff) << 8))
  61
  62 #define bswap64(x) \
  63   (__builtin_constant_p((x)) ? \
  64    __byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
  65
  66 #define bswap32(x) \
  67   (__builtin_constant_p((x)) ? \
  68    __byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
  69
  70 #define bswap16(x) \
  71   (__builtin_constant_p((x)) ? \
  72    __byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
  73
  74 #endif /* __GNUC__ && __OPTIMIZE__ */
  75 #endif /* !_LOCORE */
  76
  77 #endif /* !_SYS_BSWAP_H_ */