release/src-rt-6.x.4708/linux/linux-2.6.36/arch/tile/include/asm/swab.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_SWAB_H
  16 #define _ASM_TILE_SWAB_H
  17
  18 /* Tile gcc is always >= 4.3.0, so we use __builtin_bswap. */
  19 #define __arch_swab32(x) __builtin_bswap32(x)
  20 #define __arch_swab64(x) __builtin_bswap64(x)
  21
  22 /* Use the variant that is natural for the wordsize. */
  23 #ifdef CONFIG_64BIT
  24 #define __arch_swab16(x) (__builtin_bswap64(x) >> 48)
  25 #else
  26 #define __arch_swab16(x) (__builtin_bswap32(x) >> 16)
  27 #endif
  28
  29 #endif /* _ASM_TILE_SWAB_H */