xref: /freebsd/sys/contrib/openzfs/include/os/freebsd/spl/sys/byteorder.h (revision be181ee2)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or https://opensource.org/licenses/CDDL-1.0.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 * $FreeBSD$
 */

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#ifndef _OPENSOLARIS_SYS_BYTEORDER_H_
#define	_OPENSOLARIS_SYS_BYTEORDER_H_

#include <sys/endian.h>

#ifdef __COVERITY__
/*
 * Coverity's taint warnings from byteswapping are false positives for us.
 * Suppress them by hiding byteswapping from Coverity.
 */
#define	BSWAP_8(x)	((x) & 0xff)
#define	BSWAP_16(x)	((x) & 0xffff)
#define	BSWAP_32(x)	((x) & 0xffffffff)
#define	BSWAP_64(x)	(x)

#else /* __COVERITY__ */

/*
 * Macros to reverse byte order
 */
#define	BSWAP_8(x)	((x) & 0xff)
#define	BSWAP_16(x)	((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
#define	BSWAP_32(x)	((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
#define	BSWAP_64(x)	((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))

#endif /* __COVERITY__ */

#define	BMASK_8(x)	((x) & 0xff)
#define	BMASK_16(x)	((x) & 0xffff)
#define	BMASK_32(x)	((x) & 0xffffffff)
#define	BMASK_64(x)	(x)

/*
 * Macros to convert from a specific byte order to/from native byte order
 */
#if BYTE_ORDER == _BIG_ENDIAN
#define	BE_8(x)		BMASK_8(x)
#define	BE_16(x)	BMASK_16(x)
#define	BE_32(x)	BMASK_32(x)
#define	BE_64(x)	BMASK_64(x)
#define	LE_8(x)		BSWAP_8(x)
#define	LE_16(x)	BSWAP_16(x)
#define	LE_32(x)	BSWAP_32(x)
#define	LE_64(x)	BSWAP_64(x)
#else
#define	LE_8(x)		BMASK_8(x)
#define	LE_16(x)	BMASK_16(x)
#define	LE_32(x)	BMASK_32(x)
#define	LE_64(x)	BMASK_64(x)
#define	BE_8(x)		BSWAP_8(x)
#define	BE_16(x)	BSWAP_16(x)
#define	BE_32(x)	BSWAP_32(x)
#define	BE_64(x)	BSWAP_64(x)
#endif

#if !defined(_STANDALONE)
#if BYTE_ORDER == _BIG_ENDIAN
#define	htonll(x)	BMASK_64(x)
#define	ntohll(x)	BMASK_64(x)
#else /* BYTE_ORDER == _LITTLE_ENDIAN */
#ifndef __LP64__
static __inline__ uint64_t
htonll(uint64_t n)
{
	return ((((uint64_t)htonl(n)) << 32) + htonl(n >> 32));
}

static __inline__ uint64_t
ntohll(uint64_t n)
{
	return ((((uint64_t)ntohl(n)) << 32) + ntohl(n >> 32));
}
#else	/* !__LP64__ */
#define	htonll(x)	BSWAP_64(x)
#define	ntohll(x)	BSWAP_64(x)
#endif	/* __LP64__ */
#endif	/* BYTE_ORDER */
#endif	/* _STANDALONE */

#define	BE_IN32(xa)	htonl(*((uint32_t *)(void *)(xa)))

#endif /* _OPENSOLARIS_SYS_BYTEORDER_H_ */