sys/arch/vax/include/byte_swap.h

   1 /*      $NetBSD: byte_swap.h,v 1.10 2006/01/30 22:46:36 dsl Exp $       */
   2
   3 /*
   4  * Copyright (c) 1987, 1991 Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)endian.h    7.8 (Berkeley) 4/3/91
  32  */
  33
  34 #ifndef _VAX_BYTE_SWAP_H_
  35 #define _VAX_BYTE_SWAP_H_
  36
  37 #ifdef __GNUC__
  38 #include <sys/types.h>
  39 __BEGIN_DECLS
  40
  41 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
  42 static __inline uint32_t __attribute__((__unused__))
  43 __byte_swap_u32_variable(uint32_t x)
  44 {
  45         uint32_t y;
  46
  47         __asm volatile(
  48                 "rotl   $-8, %1, %0     \n"
  49                 "insv   %0, $16, $8, %0 \n"
  50                 "rotl   $8, %1, %%r1    \n"
  51                 "movb   %%r1, %0"
  52                 : "=&r" (y)
  53                 : "r" (x)
  54                 : "r1", "cc");
  55
  56         return (y);
  57 }
  58
  59 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
  60 static __inline uint16_t __attribute__((__unused__))
  61 __byte_swap_u16_variable(uint16_t x)
  62 {
  63
  64         return (x << 8 | x >> 8);
  65 }
  66
  67 __END_DECLS
  68 #endif
  69 #endif /* _VAX_BYTE_SWAP_H_ */