byte_swap.h revision 1.6 
1/*	$NetBSD: byte_swap.h,v 1.6 2003/08/07 16:30:08 agc 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
39static __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
56static __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