sys/arch/hppa/include/byte_swap.h

   1 /*      $NetBSD: byte_swap.h,v 1.7.82.1 2008/10/27 08:02:41 skrll Exp $ */
   2
   3 /*      $OpenBSD: endian.h,v 1.8 2004/04/07 18:24:19 mickey Exp $       */
   4
   5 /*
   6  * Copyright (c) 1998-2004 Michael Shalayeff
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef _HPPA_BYTE_SWAP_H_
  32 #define _HPPA_BYTE_SWAP_H_
  33
  34 #ifdef __GNUC__
  35 #include <sys/types.h>
  36 __BEGIN_DECLS
  37
  38
  39 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
  40 static __inline uint32_t __byte_swap_u32_variable(uint32_t);
  41 static __inline uint32_t
  42 __byte_swap_u32_variable(uint32_t x)
  43 {
  44         register uint32_t __swap32md_x; \
  45                                                 \
  46         __asm  ("extru  %1, 7,8,%%r22\n\t"      \
  47                 "shd    %1,%1,8,%0\n\t"         \
  48                 "dep    %0,15,8,%0\n\t"         \
  49                 "dep    %%r22,31,8,%0"          \
  50                 : "=&r" (__swap32md_x)          \
  51                 : "r" (x) : "r22");             \
  52         return(__swap32md_x);
  53 }
  54
  55 #if 0
  56 /*
  57  * Use generic C version because w/ asm __inline below
  58  * gcc inserts extra "extru r,31,16,r" to convert
  59  * to 16 bit entity, which produces overhead we don't need.
  60  * Besides, gcc does swap16 same way by itself.
  61  */
  62 #define __swap16md(x)   __swap16gen(x)
  63 #else
  64 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
  65 static __inline uint16_t __byte_swap_u16_variable(uint16_t);
  66 static __inline uint16_t
  67 __byte_swap_u16_variable(uint16_t x)
  68 {
  69         register uint16_t __swap16md_x;                         \
  70                                                                         \
  71         __asm  ("extru  %1,23,8,%0\n\t"                                 \
  72                 "dep    %1,23,8,%0"                                     \
  73                : "=&r" (__swap16md_x) : "r" (x));                       \
  74         return(__swap16md_x);
  75 }
  76 #endif
  77
  78 __END_DECLS
  79 #endif
  80
  81 #endif /* !_HPPA_BYTE_SWAP_H_ */