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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_ARCH_H__
19#define __XFS_ARCH_H__
20
21#ifndef XFS_BIG_INUMS
22# error XFS_BIG_INUMS must be defined true or false
23#endif
24
25#ifdef __KERNEL__
26
27#include <asm/byteorder.h>
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#ifdef __BIG_ENDIAN
Nathan Scottf016bad2005-09-08 15:30:05 +100030#define XFS_NATIVE_HOST 1
31#else
32#undef XFS_NATIVE_HOST
33#endif
34
35#else /* __KERNEL__ */
36
37#if __BYTE_ORDER == __BIG_ENDIAN
38#define XFS_NATIVE_HOST 1
39#else
40#undef XFS_NATIVE_HOST
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#endif
42
Christoph Hellwigd3a9b1f2006-01-11 15:23:43 +110043#ifdef XFS_NATIVE_HOST
44#define cpu_to_be16(val) ((__be16)(val))
45#define cpu_to_be32(val) ((__be32)(val))
46#define cpu_to_be64(val) ((__be64)(val))
Nathan Scott3762ec62006-01-12 10:29:53 +110047#define be16_to_cpu(val) ((__uint16_t)(val))
Christoph Hellwigd3a9b1f2006-01-11 15:23:43 +110048#define be32_to_cpu(val) ((__uint32_t)(val))
49#define be64_to_cpu(val) ((__uint64_t)(val))
50#else
51#define cpu_to_be16(val) (__swab16((__uint16_t)(val)))
52#define cpu_to_be32(val) (__swab32((__uint32_t)(val)))
53#define cpu_to_be64(val) (__swab64((__uint64_t)(val)))
54#define be16_to_cpu(val) (__swab16((__be16)(val)))
55#define be32_to_cpu(val) (__swab32((__be32)(val)))
56#define be64_to_cpu(val) (__swab64((__be64)(val)))
57#endif
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#endif /* __KERNEL__ */
60
61/* do we need conversion? */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#define ARCH_NOCONVERT 1
Nathan Scottf016bad2005-09-08 15:30:05 +100063#ifdef XFS_NATIVE_HOST
Linus Torvalds1da177e2005-04-16 15:20:36 -070064# define ARCH_CONVERT ARCH_NOCONVERT
Nathan Scottf016bad2005-09-08 15:30:05 +100065#else
66# define ARCH_CONVERT 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#endif
68
69/* generic swapping macros */
70
71#ifndef HAVE_SWABMACROS
72#define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
73#define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
74#define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
75#endif
76
77#define INT_SWAP(type, var) \
78 ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
79 ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
80 ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
81 (var))))
82
83/*
84 * get and set integers from potentially unaligned locations
85 */
86
87#define INT_GET_UNALIGNED_16_BE(pointer) \
88 ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
89#define INT_SET_UNALIGNED_16_BE(pointer,value) \
90 { \
91 ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
92 ((__u8*)(pointer))[1] = (((value) ) & 0xff); \
93 }
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095/* does not return a value */
96#define INT_SET(reference,arch,valueref) \
97 (__builtin_constant_p(valueref) ? \
98 (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
99 (void)( \
100 ((reference) = (valueref)), \
101 ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
102 ) \
103 )
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105/*
106 * In directories inode numbers are stored as unaligned arrays of unsigned
107 * 8bit integers on disk.
108 *
109 * For v1 directories or v2 directories that contain inode numbers that
110 * do not fit into 32bit the array has eight members, but the first member
111 * is always zero:
112 *
113 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
114 *
115 * For v2 directories that only contain entries with inode numbers that fit
116 * into 32bits a four-member array is used:
117 *
118 * |24-31|16-23| 8-15| 0- 7|
119 */
120
121#define XFS_GET_DIR_INO4(di) \
Nathan Scott3ddb8fa2006-01-11 15:33:02 +1100122 (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124#define XFS_PUT_DIR_INO4(from, di) \
125do { \
126 (di).i[0] = (((from) & 0xff000000ULL) >> 24); \
127 (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
128 (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
129 (di).i[3] = ((from) & 0x000000ffULL); \
130} while (0)
131
132#define XFS_DI_HI(di) \
Nathan Scott3ddb8fa2006-01-11 15:33:02 +1100133 (((__u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134#define XFS_DI_LO(di) \
Nathan Scott3ddb8fa2006-01-11 15:33:02 +1100135 (((__u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137#define XFS_GET_DIR_INO8(di) \
138 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
139 ((xfs_ino_t)XFS_DI_HI(di) << 32))
140
141#define XFS_PUT_DIR_INO8(from, di) \
142do { \
143 (di).i[0] = 0; \
144 (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
145 (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
146 (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
147 (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
148 (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
149 (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
150 (di).i[7] = ((from) & 0x00000000000000ffULL); \
151} while (0)
152
153#endif /* __XFS_ARCH_H__ */