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) ((__force __be16)(__u16)(val))
45 #define cpu_to_be32(val) ((__force __be32)(__u32)(val))
46 #define cpu_to_be64(val) ((__force __be64)(__u64)(val))
47 #define be16_to_cpu(val) ((__force __u16)(__be16)(val))
48 #define be32_to_cpu(val) ((__force __u32)(__be32)(val))
49 #define be64_to_cpu(val) ((__force __u64)(__be64)(val))
50 #else
51 #define cpu_to_be16(val) ((__force __be16)__swab16((__u16)(val)))
52 #define cpu_to_be32(val) ((__force __be32)__swab32((__u32)(val)))
53 #define cpu_to_be64(val) ((__force __be64)__swab64((__u64)(val)))
54 #define be16_to_cpu(val) (__swab16((__force __u16)(__be16)(val)))
55 #define be32_to_cpu(val) (__swab32((__force __u32)(__be32)(val)))
56 #define be64_to_cpu(val) (__swab64((__force __u64)(__be64)(val)))
57 #endif
58
be16_add_cpu(__be16 * a,__s16 b)59 static inline void be16_add_cpu(__be16 *a, __s16 b)
60 {
61 *a = cpu_to_be16(be16_to_cpu(*a) + b);
62 }
63
be32_add_cpu(__be32 * a,__s32 b)64 static inline void be32_add_cpu(__be32 *a, __s32 b)
65 {
66 *a = cpu_to_be32(be32_to_cpu(*a) + b);
67 }
68
be64_add_cpu(__be64 * a,__s64 b)69 static inline void be64_add_cpu(__be64 *a, __s64 b)
70 {
71 *a = cpu_to_be64(be64_to_cpu(*a) + b);
72 }
73
74 #endif /* __KERNEL__ */
75
76 /* do we need conversion? */
77 #define ARCH_NOCONVERT 1
78 #ifdef XFS_NATIVE_HOST
79 # define ARCH_CONVERT ARCH_NOCONVERT
80 #else
81 # define ARCH_CONVERT 0
82 #endif
83
84 /* generic swapping macros */
85
86 #ifndef HAVE_SWABMACROS
87 #define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
88 #define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
89 #define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
90 #endif
91
92 #define INT_SWAP(type, var) \
93 ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
94 ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
95 ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
96 (var))))
97
98 /*
99 * get and set integers from potentially unaligned locations
100 */
101
102 #define INT_GET_UNALIGNED_16_BE(pointer) \
103 ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
104 #define INT_SET_UNALIGNED_16_BE(pointer,value) \
105 { \
106 ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
107 ((__u8*)(pointer))[1] = (((value) ) & 0xff); \
108 }
109
110 /* does not return a value */
111 #define INT_SET(reference,arch,valueref) \
112 (__builtin_constant_p(valueref) ? \
113 (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
114 (void)( \
115 ((reference) = (valueref)), \
116 ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
117 ) \
118 )
119
120 /*
121 * In directories inode numbers are stored as unaligned arrays of unsigned
122 * 8bit integers on disk.
123 *
124 * For v1 directories or v2 directories that contain inode numbers that
125 * do not fit into 32bit the array has eight members, but the first member
126 * is always zero:
127 *
128 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
129 *
130 * For v2 directories that only contain entries with inode numbers that fit
131 * into 32bits a four-member array is used:
132 *
133 * |24-31|16-23| 8-15| 0- 7|
134 */
135
136 #define XFS_GET_DIR_INO4(di) \
137 (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
138
139 #define XFS_PUT_DIR_INO4(from, di) \
140 do { \
141 (di).i[0] = (((from) & 0xff000000ULL) >> 24); \
142 (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
143 (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
144 (di).i[3] = ((from) & 0x000000ffULL); \
145 } while (0)
146
147 #define XFS_DI_HI(di) \
148 (((__u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
149 #define XFS_DI_LO(di) \
150 (((__u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
151
152 #define XFS_GET_DIR_INO8(di) \
153 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
154 ((xfs_ino_t)XFS_DI_HI(di) << 32))
155
156 #define XFS_PUT_DIR_INO8(from, di) \
157 do { \
158 (di).i[0] = 0; \
159 (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
160 (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
161 (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
162 (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
163 (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
164 (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
165 (di).i[7] = ((from) & 0x00000000000000ffULL); \
166 } while (0)
167
168 #endif /* __XFS_ARCH_H__ */
169