1/*	$NetBSD: ufs_bswap.h,v 1.13 2003/10/05 17:48:50 bouyer Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 1998 Manuel Bouyer.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef _UFS_UFS_BSWAP_H_
30#define _UFS_UFS_BSWAP_H_
31
32#if defined(_KERNEL_OPT)
33#include "opt_ffs.h"
34#endif
35
36#include <sys/endian.h>
37
38#include "makefs.h"
39
40/* Macros to access UFS flags */
41#ifdef FFS_EI
42#define	UFS_MPNEEDSWAP(mp)	(VFSTOUFS(mp)->um_flags & UFS_NEEDSWAP)
43#define UFS_FSNEEDSWAP(fs)	((fs)->fs_flags & FS_SWAPPED)
44#define	UFS_IPNEEDSWAP(ip)	UFS_MPNEEDSWAP(ITOV(ip)->v_mount)
45#else
46#define	UFS_MPNEEDSWAP(mp) (0)
47#define UFS_FSNEEDSWAP(fs) (0)
48#define	UFS_IPNEEDSWAP(ip) (0)
49#endif
50
51#if !defined(_KERNEL) || defined(FFS_EI)
52/* inlines for access to swapped data */
53static __inline u_int16_t
54ufs_rw16(u_int16_t a, int ns)
55{
56	return ((ns) ?  bswap16(a) : (a));
57}
58static __inline u_int32_t
59ufs_rw32(u_int32_t a, int ns)
60{
61	return ((ns) ?  bswap32(a) : (a));
62}
63static __inline u_int64_t
64ufs_rw64(u_int64_t a, int ns)
65{
66	return ((ns) ?  bswap64(a) : (a));
67}
68#else
69#define ufs_rw16(a, ns) ((uint16_t)(a))
70#define ufs_rw32(a, ns) ((uint32_t)(a))
71#define ufs_rw64(a, ns) ((uint64_t)(a))
72#endif
73
74#define ufs_add16(a, b, ns) \
75	(a) = ufs_rw16(ufs_rw16((a), (ns)) + (b), (ns))
76#define ufs_add32(a, b, ns) \
77	(a) = ufs_rw32(ufs_rw32((a), (ns)) + (b), (ns))
78#define ufs_add64(a, b, ns) \
79	(a) = ufs_rw64(ufs_rw64((a), (ns)) + (b), (ns))
80
81#endif /* !_UFS_UFS_BSWAP_H_ */
82