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      1 /*	$NetBSD: ufs_bswap.h,v 1.23 2018/04/19 21:50:10 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(NO_FFS_EI)) || 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