2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_ARCH_H__
19 #define __XFS_ARCH_H__
22 # error XFS_BIG_INUMS must be defined true or false
25 #include <sys/endian.h>
27 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
28 #define __BIG_ENDIAN _BIG_ENDIAN
29 #define __BYTE_ORDER _BYTE_ORDER
31 /* Compatibiliy defines */
32 #define __swab16 __bswap16
33 #define __swab32 __bswap32
34 #define __swab64 __bswap64
36 #define ARCH_NOCONVERT 1
37 #if _BYTE_ORDER != _LITTLE_ENDIAN
38 #define XFS_NATIVE_HOST 1
39 # define ARCH_CONVERT ARCH_NOCONVERT
41 #undef XFS_NATIVE_HOST
42 #define ARCH_CONVERT 0
46 #ifdef XFS_NATIVE_HOST
47 #define cpu_to_be16(val) ((__be16)(val))
48 #define cpu_to_be32(val) ((__be32)(val))
49 #define cpu_to_be64(val) ((__be64)(val))
50 #define be16_to_cpu(val) ((__uint16_t)(val))
51 #define be32_to_cpu(val) ((__uint32_t)(val))
52 #define be64_to_cpu(val) ((__uint64_t)(val))
54 #define cpu_to_be16(val) (__swab16((__uint16_t)(val)))
55 #define cpu_to_be32(val) (__swab32((__uint32_t)(val)))
56 #define cpu_to_be64(val) (__swab64((__uint64_t)(val)))
57 #define be16_to_cpu(val) (__swab16((__be16)(val)))
58 #define be32_to_cpu(val) (__swab32((__be32)(val)))
59 #define be64_to_cpu(val) (__swab64((__be64)(val)))
62 //#endif /* __KERNEL__ */
64 /* do we need conversion? */
65 //#define ARCH_NOCONVERT 1
66 //#ifdef XFS_NATIVE_HOST
67 //# define ARCH_CONVERT ARCH_NOCONVERT
69 //# define ARCH_CONVERT 0
72 /* generic swapping macros */
74 #ifndef HAVE_SWABMACROS
75 #define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
76 #define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
77 #define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
80 #define INT_SWAP(type, var) \
81 ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
82 ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
83 ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
87 * get and set integers from potentially unaligned locations
90 #define INT_GET_UNALIGNED_16_BE(pointer) \
91 ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
92 #define INT_SET_UNALIGNED_16_BE(pointer,value) \
94 ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
95 ((__u8*)(pointer))[1] = (((value) ) & 0xff); \
98 /* define generic INT_ macros */
100 #define INT_GET(reference,arch) \
101 (((arch) == ARCH_NOCONVERT) \
105 INT_SWAP((reference),(reference)) \
108 /* does not return a value */
109 #define INT_SET(reference,arch,valueref) \
110 (__builtin_constant_p(valueref) ? \
111 (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
113 ((reference) = (valueref)), \
114 ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
118 /* does not return a value */
119 #define INT_MOD_EXPR(reference,arch,code) \
120 (((arch) == ARCH_NOCONVERT) \
122 (void)((reference) code) \
125 (reference) = INT_GET((reference),arch) , \
126 ((reference) code), \
127 INT_SET(reference, arch, reference) \
131 /* does not return a value */
132 #define INT_MOD(reference,arch,delta) \
134 INT_MOD_EXPR(reference,arch,+=(delta)) \
138 * INT_COPY - copy a value between two locations with the
139 * _same architecture_ but _potentially different sizes_
141 * if the types of the two parameters are equal or they are
142 * in native architecture, a simple copy is done
144 * otherwise, architecture conversions are done
148 /* does not return a value */
149 #define INT_COPY(dst,src,arch) \
151 ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
153 (void)((dst) = (src)) \
155 INT_SET(dst, arch, INT_GET(src, arch)) \
159 * INT_XLATE - copy a value in either direction between two locations
160 * with different architectures
162 * dir < 0 - copy from memory to buffer (native to arch)
163 * dir > 0 - copy from buffer to memory (arch to native)
166 /* does not return a value */
167 #define INT_XLATE(buf,mem,dir,arch) {\
170 (mem)=INT_GET(buf, arch); \
172 INT_SET(buf, arch, mem); \
176 static inline void be16_add(__be16 *a, __s16 b)
178 *a = cpu_to_be16(be16_to_cpu(*a) + b);
181 static inline void be32_add(__be32 *a, __s32 b)
183 *a = cpu_to_be32(be32_to_cpu(*a) + b);
186 static inline void be64_add(__be64 *a, __s64 b)
188 *a = cpu_to_be64(be64_to_cpu(*a) + b);
192 * In directories inode numbers are stored as unaligned arrays of unsigned
193 * 8bit integers on disk.
195 * For v1 directories or v2 directories that contain inode numbers that
196 * do not fit into 32bit the array has eight members, but the first member
199 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
201 * For v2 directories that only contain entries with inode numbers that fit
202 * into 32bits a four-member array is used:
204 * |24-31|16-23| 8-15| 0- 7|
207 #define XFS_GET_DIR_INO4(di) \
208 (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
210 #define XFS_PUT_DIR_INO4(from, di) \
212 (di).i[0] = (((from) & 0xff000000ULL) >> 24); \
213 (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
214 (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
215 (di).i[3] = ((from) & 0x000000ffULL); \
218 #define XFS_DI_HI(di) \
219 (((__u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
220 #define XFS_DI_LO(di) \
221 (((__u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
223 #define XFS_GET_DIR_INO8(di) \
224 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
225 ((xfs_ino_t)XFS_DI_HI(di) << 32))
227 #define XFS_PUT_DIR_INO8(from, di) \
230 (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
231 (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
232 (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
233 (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
234 (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
235 (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
236 (di).i[7] = ((from) & 0x00000000000000ffULL); \
239 #endif /* __XFS_ARCH_H__ */