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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * 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. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * 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 | |
1da177e4 LT |
17 | */ |
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 | ||
1da177e4 | 29 | #ifdef __BIG_ENDIAN |
f016bad6 NS |
30 | #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 | |
1da177e4 LT |
41 | #endif |
42 | ||
d3a9b1f9 CH |
43 | #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)) | |
3762ec6b | 47 | #define be16_to_cpu(val) ((__uint16_t)(val)) |
d3a9b1f9 CH |
48 | #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 | ||
1da177e4 LT |
59 | #endif /* __KERNEL__ */ |
60 | ||
61 | /* do we need conversion? */ | |
1da177e4 | 62 | #define ARCH_NOCONVERT 1 |
f016bad6 | 63 | #ifdef XFS_NATIVE_HOST |
1da177e4 | 64 | # define ARCH_CONVERT ARCH_NOCONVERT |
f016bad6 NS |
65 | #else |
66 | # define ARCH_CONVERT 0 | |
1da177e4 LT |
67 | #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 | ||
1da177e4 LT |
95 | /* 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 | ||
1da177e4 LT |
105 | /* |
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) \ | |
3ddb8fa9 | 122 | (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3])) |
1da177e4 LT |
123 | |
124 | #define XFS_PUT_DIR_INO4(from, di) \ | |
125 | do { \ | |
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) \ | |
3ddb8fa9 | 133 | (((__u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3])) |
1da177e4 | 134 | #define XFS_DI_LO(di) \ |
3ddb8fa9 | 135 | (((__u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7])) |
1da177e4 LT |
136 | |
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) \ | |
142 | do { \ | |
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__ */ |