1 | /* $NetBSD: ufs_bswap.h,v 1.21 2016/04/29 03:05:04 christos Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1998 Manuel Bouyer. |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
9 | * 1. Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * 2. Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
14 | * |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
25 | * |
26 | */ |
27 | |
28 | #ifndef _UFS_UFS_BSWAP_H_ |
29 | #define _UFS_UFS_BSWAP_H_ |
30 | |
31 | #if defined(_KERNEL_OPT) |
32 | #include "opt_ffs.h" |
33 | #endif |
34 | |
35 | #include <sys/bswap.h> |
36 | |
37 | /* Macros to access UFS flags */ |
38 | #ifdef FFS_EI |
39 | #define UFS_MPNEEDSWAP(ump) ((ump)->um_flags & UFS_NEEDSWAP) |
40 | #define UFS_FSNEEDSWAP(fs) ((fs)->fs_flags & FS_SWAPPED) |
41 | #define UFS_IPNEEDSWAP(ip) UFS_MPNEEDSWAP((ip)->i_ump) |
42 | #else |
43 | #define UFS_MPNEEDSWAP(ump) ((void)(ump), 0) |
44 | #define UFS_FSNEEDSWAP(fs) ((void)(fs), 0) |
45 | #define UFS_IPNEEDSWAP(ip) ((void)(ip), 0) |
46 | #endif |
47 | |
48 | #if !defined(_KERNEL) || defined(FFS_EI) |
49 | /* inlines for access to swapped data */ |
50 | static inline u_int16_t |
51 | ufs_rw16(uint16_t a, int ns) |
52 | { |
53 | return ((ns) ? bswap16(a) : (a)); |
54 | } |
55 | |
56 | static inline u_int32_t |
57 | ufs_rw32(uint32_t a, int ns) |
58 | { |
59 | return ((ns) ? bswap32(a) : (a)); |
60 | } |
61 | |
62 | static inline u_int64_t |
63 | ufs_rw64(uint64_t a, int ns) |
64 | { |
65 | return ((ns) ? bswap64(a) : (a)); |
66 | } |
67 | #else |
68 | static inline u_int16_t |
69 | ufs_rw16(uint16_t a, int ns) |
70 | { |
71 | return a; |
72 | } |
73 | |
74 | static inline u_int32_t |
75 | ufs_rw32(uint32_t a, int ns) |
76 | { |
77 | return a; |
78 | } |
79 | |
80 | static inline u_int64_t |
81 | ufs_rw64(uint64_t a, int ns) |
82 | { |
83 | return a; |
84 | } |
85 | #endif |
86 | |
87 | #define ufs_add16(a, b, ns) \ |
88 | (a) = ufs_rw16(ufs_rw16((a), (ns)) + (b), (ns)) |
89 | #define ufs_add32(a, b, ns) \ |
90 | (a) = ufs_rw32(ufs_rw32((a), (ns)) + (b), (ns)) |
91 | #define ufs_add64(a, b, ns) \ |
92 | (a) = ufs_rw64(ufs_rw64((a), (ns)) + (b), (ns)) |
93 | |
94 | #endif /* !_UFS_UFS_BSWAP_H_ */ |
95 | |