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#include <sys/endian.h> 26 27#define __LITTLE_ENDIAN _LITTLE_ENDIAN 28#define __BIG_ENDIAN _BIG_ENDIAN 29#define __BYTE_ORDER _BYTE_ORDER 30#define __user 31/* Compatibiliy defines */ 32#define __swab16 __bswap16 33#define __swab32 __bswap32 34#define __swab64 __bswap64 35 36#define ARCH_NOCONVERT 1 37#if _BYTE_ORDER != _LITTLE_ENDIAN 38#define XFS_NATIVE_HOST 1 39# define ARCH_CONVERT ARCH_NOCONVERT 40#else 41#undef XFS_NATIVE_HOST 42#define ARCH_CONVERT 0 43#endif 44 45 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)) 53#else 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))) 60#endif 61 62//#endif /* __KERNEL__ */ 63 64/* do we need conversion? */ 65//#define ARCH_NOCONVERT 1 66//#ifdef XFS_NATIVE_HOST 67//# define ARCH_CONVERT ARCH_NOCONVERT 68//#else 69//# define ARCH_CONVERT 0 70//#endif 71 72/* generic swapping macros */ 73 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)))) 78#endif 79 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) : \ 84 (var)))) 85 86/* 87 * get and set integers from potentially unaligned locations 88 */ 89 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) \ 93 { \ 94 ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \ 95 ((__u8*)(pointer))[1] = (((value) ) & 0xff); \ 96 } 97 98/* define generic INT_ macros */ 99 100#define INT_GET(reference,arch) \ 101 (((arch) == ARCH_NOCONVERT) \ 102 ? \ 103 (reference) \ 104 : \ 105 INT_SWAP((reference),(reference)) \ 106 ) 107 108/* 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)) ) : \ 112 (void)( \ 113 ((reference) = (valueref)), \ 114 ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \ 115 ) \ 116 ) 117 118/* does not return a value */ 119#define INT_MOD_EXPR(reference,arch,code) \ 120 (((arch) == ARCH_NOCONVERT) \ 121 ? \ 122 (void)((reference) code) \ 123 : \ 124 (void)( \ 125 (reference) = INT_GET((reference),arch) , \ 126 ((reference) code), \ 127 INT_SET(reference, arch, reference) \ 128 ) \ 129 ) 130 131/* does not return a value */ 132#define INT_MOD(reference,arch,delta) \ 133 (void)( \ 134 INT_MOD_EXPR(reference,arch,+=(delta)) \ 135 ) 136 137/* 138 * INT_COPY - copy a value between two locations with the 139 * _same architecture_ but _potentially different sizes_ 140 * 141 * if the types of the two parameters are equal or they are 142 * in native architecture, a simple copy is done 143 * 144 * otherwise, architecture conversions are done 145 * 146 */ 147 148/* does not return a value */ 149#define INT_COPY(dst,src,arch) \ 150 ( \ 151 ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \ 152 ? \ 153 (void)((dst) = (src)) \ 154 : \ 155 INT_SET(dst, arch, INT_GET(src, arch)) \ 156 ) 157 158/* 159 * INT_XLATE - copy a value in either direction between two locations 160 * with different architectures 161 * 162 * dir < 0 - copy from memory to buffer (native to arch) 163 * dir > 0 - copy from buffer to memory (arch to native) 164 */ 165 166/* does not return a value */ 167#define INT_XLATE(buf,mem,dir,arch) {\ 168 ASSERT(dir); \ 169 if (dir>0) { \ 170 (mem)=INT_GET(buf, arch); \ 171 } else { \ 172 INT_SET(buf, arch, mem); \ 173 } \ 174} 175 176static inline void be16_add(__be16 *a, __s16 b) 177{ 178 *a = cpu_to_be16(be16_to_cpu(*a) + b); 179} 180 181static inline void be32_add(__be32 *a, __s32 b) 182{ 183 *a = cpu_to_be32(be32_to_cpu(*a) + b); 184} 185 186static inline void be64_add(__be64 *a, __s64 b) 187{ 188 *a = cpu_to_be64(be64_to_cpu(*a) + b); 189} 190 191/* 192 * In directories inode numbers are stored as unaligned arrays of unsigned 193 * 8bit integers on disk. 194 * 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 197 * is always zero: 198 * 199 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7| 200 * 201 * For v2 directories that only contain entries with inode numbers that fit 202 * into 32bits a four-member array is used: 203 * 204 * |24-31|16-23| 8-15| 0- 7| 205 */ 206 207#define XFS_GET_DIR_INO4(di) \ 208 (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3])) 209 210#define XFS_PUT_DIR_INO4(from, di) \ 211do { \ 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); \ 216} while (0) 217 218#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])) 222 223#define XFS_GET_DIR_INO8(di) \ 224 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \ 225 ((xfs_ino_t)XFS_DI_HI(di) << 32)) 226 227#define XFS_PUT_DIR_INO8(from, di) \ 228do { \ 229 (di).i[0] = 0; \ 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); \ 237} while (0) 238 239#endif /* __XFS_ARCH_H__ */ 240