1 /*
2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
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
29 #ifdef __BIG_ENDIAN
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
41 #endif
42
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))
47 #define be16_to_cpu(val) ((__uint16_t)(val))
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
59 #endif /* __KERNEL__ */
60
61 /* do we need conversion? */
62 #define ARCH_NOCONVERT 1
63 #ifdef XFS_NATIVE_HOST
64 # define ARCH_CONVERT ARCH_NOCONVERT
65 #else
66 # define ARCH_CONVERT 0
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
95 /* define generic INT_ macros */
96
97 #define INT_GET(reference,arch) \
98 (((arch) == ARCH_NOCONVERT) \
99 ? \
100 (reference) \
101 : \
102 INT_SWAP((reference),(reference)) \
103 )
104
105 /* does not return a value */
106 #define INT_SET(reference,arch,valueref) \
107 (__builtin_constant_p(valueref) ? \
108 (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
109 (void)( \
110 ((reference) = (valueref)), \
111 ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
112 ) \
113 )
114
115 /* does not return a value */
116 #define INT_MOD_EXPR(reference,arch,code) \
117 (((arch) == ARCH_NOCONVERT) \
118 ? \
119 (void)((reference) code) \
120 : \
121 (void)( \
122 (reference) = INT_GET((reference),arch) , \
123 ((reference) code), \
124 INT_SET(reference, arch, reference) \
125 ) \
126 )
127
128 /* does not return a value */
129 #define INT_MOD(reference,arch,delta) \
130 (void)( \
131 INT_MOD_EXPR(reference,arch,+=(delta)) \
132 )
133
134 /*
135 * INT_COPY - copy a value between two locations with the
136 * _same architecture_ but _potentially different sizes_
137 *
138 * if the types of the two parameters are equal or they are
139 * in native architecture, a simple copy is done
140 *
141 * otherwise, architecture conversions are done
142 *
143 */
144
145 /* does not return a value */
146 #define INT_COPY(dst,src,arch) \
147 ( \
148 ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
149 ? \
150 (void)((dst) = (src)) \
151 : \
152 INT_SET(dst, arch, INT_GET(src, arch)) \
153 )
154
155 /*
156 * INT_XLATE - copy a value in either direction between two locations
157 * with different architectures
158 *
159 * dir < 0 - copy from memory to buffer (native to arch)
160 * dir > 0 - copy from buffer to memory (arch to native)
161 */
162
163 /* does not return a value */
164 #define INT_XLATE(buf,mem,dir,arch) {\
165 ASSERT(dir); \
166 if (dir>0) { \
167 (mem)=INT_GET(buf, arch); \
168 } else { \
169 INT_SET(buf, arch, mem); \
170 } \
171 }
172
173 /*
174 * In directories inode numbers are stored as unaligned arrays of unsigned
175 * 8bit integers on disk.
176 *
177 * For v1 directories or v2 directories that contain inode numbers that
178 * do not fit into 32bit the array has eight members, but the first member
179 * is always zero:
180 *
181 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
182 *
183 * For v2 directories that only contain entries with inode numbers that fit
184 * into 32bits a four-member array is used:
185 *
186 * |24-31|16-23| 8-15| 0- 7|
187 */
188
189 #define XFS_GET_DIR_INO4(di) \
190 (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
191
192 #define XFS_PUT_DIR_INO4(from, di) \
193 do { \
194 (di).i[0] = (((from) & 0xff000000ULL) >> 24); \
195 (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
196 (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
197 (di).i[3] = ((from) & 0x000000ffULL); \
198 } while (0)
199
200 #define XFS_DI_HI(di) \
201 (((__u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
202 #define XFS_DI_LO(di) \
203 (((__u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
204
205 #define XFS_GET_DIR_INO8(di) \
206 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
207 ((xfs_ino_t)XFS_DI_HI(di) << 32))
208
209 #define XFS_PUT_DIR_INO8(from, di) \
210 do { \
211 (di).i[0] = 0; \
212 (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
213 (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
214 (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
215 (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
216 (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
217 (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
218 (di).i[7] = ((from) & 0x00000000000000ffULL); \
219 } while (0)
220
221 #endif /* __XFS_ARCH_H__ */
222
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