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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 | ||
43 | #endif /* __KERNEL__ */ | |
44 | ||
45 | /* do we need conversion? */ | |
1da177e4 | 46 | #define ARCH_NOCONVERT 1 |
f016bad6 | 47 | #ifdef XFS_NATIVE_HOST |
1da177e4 | 48 | # define ARCH_CONVERT ARCH_NOCONVERT |
f016bad6 NS |
49 | #else |
50 | # define ARCH_CONVERT 0 | |
1da177e4 LT |
51 | #endif |
52 | ||
53 | /* generic swapping macros */ | |
54 | ||
55 | #ifndef HAVE_SWABMACROS | |
56 | #define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var)))) | |
57 | #define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var)))) | |
58 | #define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var)))) | |
59 | #endif | |
60 | ||
61 | #define INT_SWAP(type, var) \ | |
62 | ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \ | |
63 | ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \ | |
64 | ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \ | |
65 | (var)))) | |
66 | ||
67 | /* | |
68 | * get and set integers from potentially unaligned locations | |
69 | */ | |
70 | ||
71 | #define INT_GET_UNALIGNED_16_BE(pointer) \ | |
72 | ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1]))) | |
73 | #define INT_SET_UNALIGNED_16_BE(pointer,value) \ | |
74 | { \ | |
75 | ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \ | |
76 | ((__u8*)(pointer))[1] = (((value) ) & 0xff); \ | |
77 | } | |
78 | ||
79 | /* define generic INT_ macros */ | |
80 | ||
81 | #define INT_GET(reference,arch) \ | |
82 | (((arch) == ARCH_NOCONVERT) \ | |
83 | ? \ | |
84 | (reference) \ | |
85 | : \ | |
86 | INT_SWAP((reference),(reference)) \ | |
87 | ) | |
88 | ||
89 | /* does not return a value */ | |
90 | #define INT_SET(reference,arch,valueref) \ | |
91 | (__builtin_constant_p(valueref) ? \ | |
92 | (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \ | |
93 | (void)( \ | |
94 | ((reference) = (valueref)), \ | |
95 | ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \ | |
96 | ) \ | |
97 | ) | |
98 | ||
99 | /* does not return a value */ | |
100 | #define INT_MOD_EXPR(reference,arch,code) \ | |
101 | (((arch) == ARCH_NOCONVERT) \ | |
102 | ? \ | |
103 | (void)((reference) code) \ | |
104 | : \ | |
105 | (void)( \ | |
106 | (reference) = INT_GET((reference),arch) , \ | |
107 | ((reference) code), \ | |
108 | INT_SET(reference, arch, reference) \ | |
109 | ) \ | |
110 | ) | |
111 | ||
112 | /* does not return a value */ | |
113 | #define INT_MOD(reference,arch,delta) \ | |
114 | (void)( \ | |
115 | INT_MOD_EXPR(reference,arch,+=(delta)) \ | |
116 | ) | |
117 | ||
118 | /* | |
119 | * INT_COPY - copy a value between two locations with the | |
120 | * _same architecture_ but _potentially different sizes_ | |
121 | * | |
122 | * if the types of the two parameters are equal or they are | |
123 | * in native architecture, a simple copy is done | |
124 | * | |
125 | * otherwise, architecture conversions are done | |
126 | * | |
127 | */ | |
128 | ||
129 | /* does not return a value */ | |
130 | #define INT_COPY(dst,src,arch) \ | |
131 | ( \ | |
132 | ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \ | |
133 | ? \ | |
134 | (void)((dst) = (src)) \ | |
135 | : \ | |
136 | INT_SET(dst, arch, INT_GET(src, arch)) \ | |
137 | ) | |
138 | ||
139 | /* | |
140 | * INT_XLATE - copy a value in either direction between two locations | |
141 | * with different architectures | |
142 | * | |
143 | * dir < 0 - copy from memory to buffer (native to arch) | |
144 | * dir > 0 - copy from buffer to memory (arch to native) | |
145 | */ | |
146 | ||
147 | /* does not return a value */ | |
148 | #define INT_XLATE(buf,mem,dir,arch) {\ | |
149 | ASSERT(dir); \ | |
150 | if (dir>0) { \ | |
151 | (mem)=INT_GET(buf, arch); \ | |
152 | } else { \ | |
153 | INT_SET(buf, arch, mem); \ | |
154 | } \ | |
155 | } | |
156 | ||
157 | /* | |
158 | * In directories inode numbers are stored as unaligned arrays of unsigned | |
159 | * 8bit integers on disk. | |
160 | * | |
161 | * For v1 directories or v2 directories that contain inode numbers that | |
162 | * do not fit into 32bit the array has eight members, but the first member | |
163 | * is always zero: | |
164 | * | |
165 | * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7| | |
166 | * | |
167 | * For v2 directories that only contain entries with inode numbers that fit | |
168 | * into 32bits a four-member array is used: | |
169 | * | |
170 | * |24-31|16-23| 8-15| 0- 7| | |
171 | */ | |
172 | ||
173 | #define XFS_GET_DIR_INO4(di) \ | |
174 | (((u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3])) | |
175 | ||
176 | #define XFS_PUT_DIR_INO4(from, di) \ | |
177 | do { \ | |
178 | (di).i[0] = (((from) & 0xff000000ULL) >> 24); \ | |
179 | (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \ | |
180 | (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \ | |
181 | (di).i[3] = ((from) & 0x000000ffULL); \ | |
182 | } while (0) | |
183 | ||
184 | #define XFS_DI_HI(di) \ | |
185 | (((u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3])) | |
186 | #define XFS_DI_LO(di) \ | |
187 | (((u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7])) | |
188 | ||
189 | #define XFS_GET_DIR_INO8(di) \ | |
190 | (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \ | |
191 | ((xfs_ino_t)XFS_DI_HI(di) << 32)) | |
192 | ||
193 | #define XFS_PUT_DIR_INO8(from, di) \ | |
194 | do { \ | |
195 | (di).i[0] = 0; \ | |
196 | (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \ | |
197 | (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \ | |
198 | (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \ | |
199 | (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \ | |
200 | (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \ | |
201 | (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \ | |
202 | (di).i[7] = ((from) & 0x00000000000000ffULL); \ | |
203 | } while (0) | |
204 | ||
205 | #endif /* __XFS_ARCH_H__ */ |