| 1 | /* $NetBSD: ulfs_bswap.h,v 1.8 2016/06/20 03:29:52 dholland Exp $ */ |
| 2 | /* from NetBSD: ufs_bswap.h,v 1.21 2016/04/29 03:05:04 christos Exp */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1998 Manuel Bouyer. |
| 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 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #ifndef _UFS_LFS_ULFS_BSWAP_H_ |
| 30 | #define _UFS_LFS_ULFS_BSWAP_H_ |
| 31 | |
| 32 | #if defined(_KERNEL_OPT) |
| 33 | #include "opt_lfs.h" |
| 34 | #endif |
| 35 | |
| 36 | #include <sys/bswap.h> |
| 37 | |
| 38 | /* Macros to access ULFS flags */ |
| 39 | #ifdef LFS_EI |
| 40 | #define ULFS_MPNEEDSWAP(lfs) ((lfs)->um_flags & ULFS_NEEDSWAP) |
| 41 | #define ULFS_FSNEEDSWAP(fs) ((fs)->fs_flags & FS_SWAPPED) |
| 42 | #define ULFS_IPNEEDSWAP(ip) ULFS_MPNEEDSWAP((ip)->i_lfs) |
| 43 | #else |
| 44 | #define ULFS_MPNEEDSWAP(ump) (__USE(ump), 0) |
| 45 | #define ULFS_FSNEEDSWAP(fs) (__USE(fs), 0) |
| 46 | #define ULFS_IPNEEDSWAP(ip) (__USE(ip), 0) |
| 47 | #endif |
| 48 | |
| 49 | #if !defined(_KERNEL) || defined(LFS_EI) |
| 50 | /* inlines for access to swapped data */ |
| 51 | static inline uint16_t |
| 52 | ulfs_rw16(uint16_t a, int ns) |
| 53 | { |
| 54 | return ((ns) ? bswap16(a) : (a)); |
| 55 | } |
| 56 | |
| 57 | static inline uint32_t |
| 58 | ulfs_rw32(uint32_t a, int ns) |
| 59 | { |
| 60 | return ((ns) ? bswap32(a) : (a)); |
| 61 | } |
| 62 | |
| 63 | static inline uint64_t |
| 64 | ulfs_rw64(uint64_t a, int ns) |
| 65 | { |
| 66 | return ((ns) ? bswap64(a) : (a)); |
| 67 | } |
| 68 | #else |
| 69 | #define ulfs_rw16(a, ns) (__USE(ns), (uint16_t)(a)) |
| 70 | #define ulfs_rw32(a, ns) (__USE(ns), (uint32_t)(a)) |
| 71 | #define ulfs_rw64(a, ns) (__USE(ns), (uint64_t)(a)) |
| 72 | #endif |
| 73 | |
| 74 | #define ulfs_add16(a, b, ns) \ |
| 75 | (a) = ulfs_rw16(ulfs_rw16((a), (ns)) + (b), (ns)) |
| 76 | #define ulfs_add32(a, b, ns) \ |
| 77 | (a) = ulfs_rw32(ulfs_rw32((a), (ns)) + (b), (ns)) |
| 78 | #define ulfs_add64(a, b, ns) \ |
| 79 | (a) = ulfs_rw64(ulfs_rw64((a), (ns)) + (b), (ns)) |
| 80 | |
| 81 | #endif /* !_UFS_LFS_ULFS_BSWAP_H_ */ |
| 82 | |