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byte_swap.h revision 1.8 
      1 /*	$NetBSD: byte_swap.h,v 1.8 2005/12/24 20:07:41 perry 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 #include <sys/types.h>
     38 
     39 static inline uint32_t __attribute__((__unused__))
     40 __byte_swap_long_variable(uint32_t x)
     41 {
     42 	uint32_t y;
     43 
     44 	__asm volatile(
     45 		"rotl	$-8, %1, %0	\n"
     46 		"insv	%0, $16, $8, %0	\n"
     47 		"rotl	$8, %1, %%r1	\n"
     48 		"movb	%%r1, %0"
     49 		: "=&r" (y)
     50 		: "r" (x)
     51 		: "r1", "cc");
     52 
     53 	return (y);
     54 }
     55 
     56 static inline uint16_t __attribute__((__unused__))
     57 __byte_swap_word_variable(uint16_t x)
     58 {
     59 
     60 	return (x << 8 | x >> 8);
     61 }
     62 
     63 #define __byte_swap_long(x)     __byte_swap_long_variable(x)
     64 #define __byte_swap_word(x)     __byte_swap_word_variable(x)
     65 
     66 #endif /* _VAX_BYTE_SWAP_H_ */
     67