11849Swollman/*	$NetBSD: byte_swap.h,v 1.9.58.1 2013/07/23 21:07:34 riastradh Exp $	*/
21849Swollman
31849Swollman/*-
41849Swollman * Copyright (c) 1998 The NetBSD Foundation, Inc.
51849Swollman * All rights reserved.
61849Swollman *
71849Swollman * This code is derived from software contributed to The NetBSD Foundation
81849Swollman * by Leo Weppelman.
91849Swollman *
101849Swollman * Redistribution and use in source and binary forms, with or without
111849Swollman * modification, are permitted provided that the following conditions
121849Swollman * are met:
131849Swollman * 1. Redistributions of source code must retain the above copyright
141849Swollman *    notice, this list of conditions and the following disclaimer.
151849Swollman * 2. Redistributions in binary form must reproduce the above copyright
161849Swollman *    notice, this list of conditions and the following disclaimer in the
171849Swollman *    documentation and/or other materials provided with the distribution.
181849Swollman *
191849Swollman * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
201849Swollman * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
211849Swollman * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
221849Swollman * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
231849Swollman * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
241849Swollman * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
251849Swollman * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
261849Swollman * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
271849Swollman * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
281849Swollman * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
291849Swollman * POSSIBILITY OF SUCH DAMAGE.
301849Swollman */
311849Swollman
321849Swollman#ifndef	M68K_BYTE_SWAP_H_
3392999Sobrien#define	M68K_BYTE_SWAP_H_
3492999Sobrien
3592999Sobrien#ifdef __GNUC__
3692999Sobrien#include <sys/types.h>
3792999Sobrien__BEGIN_DECLS
381849Swollman
391849Swollman
401849Swollman#define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
411849Swollmanstatic __inline uint16_t __byte_swap_u16_variable(uint16_t);
421849Swollmanstatic __inline uint16_t
431849Swollman__byte_swap_u16_variable(uint16_t var)
441849Swollman{
4515634Speter#if defined(__mcfisac__)
461849Swollman	__asm volatile ("swap %0; byterev %0" : "=d"(var) : "0" (var));
471849Swollman#elif defined(__mcoldfire__)
481849Swollman	return (var >> 8) || (var << 8);
491849Swollman#else
501849Swollman	__asm volatile ("rorw #8, %0" : "=d" (var) : "0" (var));
5115634Speter	return (var);
5215634Speter#endif
53184548Speter}
54217106Skib
55217106Skib#define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
56static __inline uint32_t __byte_swap_u32_variable(uint32_t);
57static __inline uint32_t
58__byte_swap_u32_variable(uint32_t var)
59{
60#if defined(__mcfisac__)
61	__asm volatile ("byterev %0" : "=d"(var) : "0" (var));
62#elif defined(__mcoldfire__)
63	return (var >> 24) | (var << 24) | ((var & 0x00ff0000) >> 8)
64	    | ((var << 8) & 0x00ff0000);
65#else
66	__asm volatile (
67		"rorw #8, %0; swap %0; rorw #8, %0" : "=d" (var) : "0" (var));
68#endif
69	return (var);
70}
71
72__END_DECLS
73#endif
74
75#endif /* !M68K_BYTE_SWAP_H_ */
76