byte_swap.h revision 1.5 
1/*	$NetBSD: byte_swap.h,v 1.5 2002/02/24 01:04:26 matt 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#include <sys/types.h>
42
43static __inline uint32_t __attribute__((__unused__))
44__byte_swap_long_variable(uint32_t x)
45{
46	uint32_t y;
47
48	__asm __volatile(
49		"rotl	$-8, %1, %0	\n"
50		"insv	%0, $16, $8, %0	\n"
51		"rotl	$8, %1, %%r1	\n"
52		"movb	%%r1, %0"
53		: "=&r" (y)
54		: "r" (x)
55		: "r1", "cc");
56
57	return (y);
58}
59
60static __inline uint16_t __attribute__((__unused__))
61__byte_swap_word_variable(uint16_t x)
62{
63
64	return (x << 8 | x >> 8);
65}
66
67#define __byte_swap_long(x)     __byte_swap_long_variable(x)
68#define __byte_swap_word(x)     __byte_swap_word_variable(x)
69
70#endif /* _VAX_BYTE_SWAP_H_ */
71