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byte_swap.h revision 1.3 
      1 /*	$NetBSD: byte_swap.h,v 1.3 2001/11/29 22:32:45 thorpej 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by the University of
     18  *      California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *      @(#)endian.h    7.8 (Berkeley) 4/3/91
     36  */
     37 
     38 #ifndef _VAX_BYTE_SWAP_H_
     39 #define _VAX_BYTE_SWAP_H_
     40 
     41 static __inline uint32_t __attribute__((__unused__))
     42 __byte_swap_long_variable(uint32_t x)
     43 {
     44 	uint32_t y;
     45 
     46 	__asm __volatile(
     47 		"rotl	$-8, %1, %0	\n"
     48 		"insv	%0, $16, $8, %0	\n"
     49 		"rotl	$8, %1, r1	\n"
     50 		"movb	r1, %0"
     51 		: "=&r" (y)
     52 		: "r" (x)
     53 		: "r1", "cc");
     54 
     55 	return (y);
     56 }
     57 
     58 static __inline uint16_t __attribute__((__unused__))
     59 __byte_swap_word_variable(uint16_t x)
     60 {
     61 
     62 	return (x << 8 | x >> 8);
     63 }
     64 
     65 #define __byte_swap_long(x)     __byte_swap_long_variable(x)
     66 #define __byte_swap_word(x)     __byte_swap_word_variable(x)
     67 
     68 #endif /* _VAX_BYTE_SWAP_H_ */
     69