include/xfs_arch.h

   1 /*
   2  * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_ARCH_H__
  33 #define __XFS_ARCH_H__
  34
  35 #ifndef XFS_BIG_FILESYSTEMS
  36 #error XFS_BIG_FILESYSTEMS must be defined true or false
  37 #endif
  38
  39 #ifdef __KERNEL__
  40
  41 #include <asm/byteorder.h>
  42
  43 #ifdef __LITTLE_ENDIAN
  44 # define __BYTE_ORDER   __LITTLE_ENDIAN
  45 #endif
  46 #ifdef __BIG_ENDIAN
  47 # define __BYTE_ORDER   __BIG_ENDIAN
  48 #endif
  49
  50 #endif  /* __KERNEL__ */
  51
  52 /* do we need conversion? */
  53
  54 #define ARCH_NOCONVERT 1
  55 #if __BYTE_ORDER == __LITTLE_ENDIAN
  56 #define ARCH_CONVERT   0
  57 #else
  58 #define ARCH_CONVERT   ARCH_NOCONVERT
  59 #endif
  60
  61 /* generic swapping macros */
  62
  63 #define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
  64 #define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
  65 #define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
  66
  67 #define INT_SWAP(type, var) \
  68     ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
  69     ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
  70     ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
  71     (var))))
  72
  73 #define INT_SWAP_UNALIGNED_32(from,to) \
  74     { \
  75         ((__u8*)(to))[0] = ((__u8*)(from))[3]; \
  76         ((__u8*)(to))[1] = ((__u8*)(from))[2]; \
  77         ((__u8*)(to))[2] = ((__u8*)(from))[1]; \
  78         ((__u8*)(to))[3] = ((__u8*)(from))[0]; \
  79     }
  80
  81 #define INT_SWAP_UNALIGNED_64(from,to) \
  82     { \
  83         INT_SWAP_UNALIGNED_32( ((__u8*)(from)) + 4, ((__u8*)(to))); \
  84         INT_SWAP_UNALIGNED_32( ((__u8*)(from)), ((__u8*)(to)) + 4); \
  85     }
  86
  87 /*
  88  * get and set integers from potentially unaligned locations
  89  */
  90
  91 #define INT_GET_UNALIGNED_16_LE(pointer) \
  92    ((__u16)((((__u8*)(pointer))[0]      ) | (((__u8*)(pointer))[1] << 8 )))
  93 #define INT_GET_UNALIGNED_16_BE(pointer) \
  94    ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
  95 #define INT_SET_UNALIGNED_16_LE(pointer,value) \
  96     { \
  97         ((__u8*)(pointer))[0] = (((value)     ) & 0xff); \
  98         ((__u8*)(pointer))[1] = (((value) >> 8) & 0xff); \
  99     }
 100 #define INT_SET_UNALIGNED_16_BE(pointer,value) \
 101     { \
 102         ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
 103         ((__u8*)(pointer))[1] = (((value)     ) & 0xff); \
 104     }
 105
 106 #define INT_GET_UNALIGNED_32_LE(pointer) \
 107    ((__u32)((((__u8*)(pointer))[0]      ) | (((__u8*)(pointer))[1] << 8 ) \
 108            |(((__u8*)(pointer))[2] << 16) | (((__u8*)(pointer))[3] << 24)))
 109 #define INT_GET_UNALIGNED_32_BE(pointer) \
 110    ((__u32)((((__u8*)(pointer))[0] << 24) | (((__u8*)(pointer))[1] << 16) \
 111            |(((__u8*)(pointer))[2] << 8)  | (((__u8*)(pointer))[3]      )))
 112
 113 #define INT_GET_UNALIGNED_64_LE(pointer) \
 114    (((__u64)(INT_GET_UNALIGNED_32_LE(((__u8*)(pointer))+4)) << 32 ) \
 115    |((__u64)(INT_GET_UNALIGNED_32_LE(((__u8*)(pointer))  ))       ))
 116 #define INT_GET_UNALIGNED_64_BE(pointer) \
 117    (((__u64)(INT_GET_UNALIGNED_32_BE(((__u8*)(pointer))  )) << 32  ) \
 118    |((__u64)(INT_GET_UNALIGNED_32_BE(((__u8*)(pointer))+4))        ))
 119
 120 /*
 121  * now pick the right ones for our MACHINE ARCHITECTURE
 122  */
 123
 124 #if __BYTE_ORDER == __LITTLE_ENDIAN
 125 #define INT_GET_UNALIGNED_16(pointer)       INT_GET_UNALIGNED_16_LE(pointer)
 126 #define INT_SET_UNALIGNED_16(pointer,value) INT_SET_UNALIGNED_16_LE(pointer,value)
 127 #define INT_GET_UNALIGNED_32(pointer)       INT_GET_UNALIGNED_32_LE(pointer)
 128 #define INT_GET_UNALIGNED_64(pointer)       INT_GET_UNALIGNED_64_LE(pointer)
 129 #else
 130 #define INT_GET_UNALIGNED_16(pointer)       INT_GET_UNALIGNED_16_BE(pointer)
 131 #define INT_SET_UNALIGNED_16(pointer,value) INT_SET_UNALIGNED_16_BE(pointer,value)
 132 #define INT_GET_UNALIGNED_32(pointer)       INT_GET_UNALIGNED_32_BE(pointer)
 133 #define INT_GET_UNALIGNED_64(pointer)       INT_GET_UNALIGNED_64_BE(pointer)
 134 #endif
 135
 136 /* define generic INT_ macros */
 137
 138 #define INT_GET(reference,arch) \
 139     (((arch) == ARCH_NOCONVERT) \
 140         ? \
 141             (reference) \
 142         : \
 143             INT_SWAP((reference),(reference)) \
 144     )
 145
 146 /* does not return a value */
 147 #define INT_SET(reference,arch,valueref) \
 148     (__builtin_constant_p(valueref) ? \
 149         (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
 150         (void)( \
 151             ((reference) = (valueref)), \
 152             ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
 153         ) \
 154     )
 155
 156 /* does not return a value */
 157 #define INT_MOD_EXPR(reference,arch,code) \
 158     (void)(((arch) == ARCH_NOCONVERT) \
 159         ? \
 160             ((reference) code) \
 161         : \
 162             ( \
 163                 (reference) = INT_GET((reference),arch) , \
 164                 ((reference) code), \
 165                 INT_SET(reference, arch, reference) \
 166             ) \
 167     )
 168
 169 /* does not return a value */
 170 #define INT_MOD(reference,arch,delta) \
 171     (void)( \
 172         INT_MOD_EXPR(reference,arch,+=(delta)) \
 173     )
 174
 175 /*
 176  * INT_COPY - copy a value between two locations with the
 177  *            _same architecture_ but _potentially different sizes_
 178  *
 179  *          if the types of the two parameters are equal or they are
 180  *              in native architecture, a simple copy is done
 181  *
 182  *          otherwise, architecture conversions are done
 183  *
 184  */
 185
 186 /* does not return a value */
 187 #define INT_COPY(dst,src,arch) \
 188     (void)( \
 189         ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
 190             ? \
 191                 ((dst) = (src)) \
 192             : \
 193                 INT_SET(dst, arch, INT_GET(src, arch)) \
 194     )
 195
 196 /*
 197  * INT_XLATE - copy a value in either direction between two locations
 198  *             with different architectures
 199  *
 200  *                  dir < 0     - copy from memory to buffer (native to arch)
 201  *                  dir > 0     - copy from buffer to memory (arch to native)
 202  */
 203
 204 /* does not return a value */
 205 #define INT_XLATE(buf,mem,dir,arch) {\
 206     ASSERT(dir); \
 207     if (dir>0) { \
 208         (mem)=INT_GET(buf, arch); \
 209     } else { \
 210         INT_SET(buf, arch, mem); \
 211     } \
 212 }
 213
 214 #define INT_ISZERO(reference,arch) \
 215     ((reference) == 0)
 216
 217 #define INT_ZERO(reference,arch) \
 218     ((reference) = 0)
 219
 220 #define INT_GET_UNALIGNED_16_ARCH(pointer,arch) \
 221     ( ((arch) == ARCH_NOCONVERT) \
 222         ? \
 223             (INT_GET_UNALIGNED_16(pointer)) \
 224         : \
 225             (INT_GET_UNALIGNED_16_BE(pointer)) \
 226     )
 227 #define INT_SET_UNALIGNED_16_ARCH(pointer,value,arch) \
 228     if ((arch) == ARCH_NOCONVERT) { \
 229         INT_SET_UNALIGNED_16(pointer,value); \
 230     } else { \
 231         INT_SET_UNALIGNED_16_BE(pointer,value); \
 232     }
 233
 234 #define DIRINO4_GET_ARCH(pointer,arch) \
 235     ( ((arch) == ARCH_NOCONVERT) \
 236         ? \
 237             (INT_GET_UNALIGNED_32(pointer)) \
 238         : \
 239             (INT_GET_UNALIGNED_32_BE(pointer)) \
 240     )
 241
 242 #if XFS_BIG_FILESYSTEMS
 243 #define DIRINO_GET_ARCH(pointer,arch) \
 244     ( ((arch) == ARCH_NOCONVERT) \
 245         ? \
 246             (INT_GET_UNALIGNED_64(pointer)) \
 247         : \
 248             (INT_GET_UNALIGNED_64_BE(pointer)) \
 249     )
 250 #else
 251 /* MACHINE ARCHITECTURE dependent */
 252 #if __BYTE_ORDER == __LITTLE_ENDIAN
 253 #define DIRINO_GET_ARCH(pointer,arch) \
 254     DIRINO4_GET_ARCH((((__u8*)pointer)+4),arch)
 255 #else
 256 #define DIRINO_GET_ARCH(pointer,arch) \
 257     DIRINO4_GET_ARCH(pointer,arch)
 258 #endif
 259 #endif
 260
 261 #define DIRINO_COPY_ARCH(from,to,arch) \
 262     if ((arch) == ARCH_NOCONVERT) { \
 263         bcopy(from,to,sizeof(xfs_ino_t)); \
 264     } else { \
 265         INT_SWAP_UNALIGNED_64(from,to); \
 266     }
 267 #define DIRINO4_COPY_ARCH(from,to,arch) \
 268     if ((arch) == ARCH_NOCONVERT) { \
 269         bcopy((((__u8*)from+4)),to,sizeof(xfs_dir2_ino4_t)); \
 270     } else { \
 271         INT_SWAP_UNALIGNED_32(from,to); \
 272     }
 273
 274 #endif  /* __XFS_ARCH_H__ */