221 lines
5.8 KiB
C
221 lines
5.8 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_ARCH_H__
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#define __XFS_ARCH_H__
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#ifndef XFS_BIG_INUMS
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# error XFS_BIG_INUMS must be defined true or false
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#endif
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#ifdef __KERNEL__
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#include <asm/byteorder.h>
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#ifdef __BIG_ENDIAN
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#define XFS_NATIVE_HOST 1
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#else
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#undef XFS_NATIVE_HOST
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#endif
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#else /* __KERNEL__ */
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define XFS_NATIVE_HOST 1
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#else
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#undef XFS_NATIVE_HOST
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#endif
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#endif /* __KERNEL__ */
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/* do we need conversion? */
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#define ARCH_NOCONVERT 1
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#ifdef XFS_NATIVE_HOST
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# define ARCH_CONVERT ARCH_NOCONVERT
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#else
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# define ARCH_CONVERT 0
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#endif
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/* generic swapping macros */
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#ifndef HAVE_SWABMACROS
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#define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
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#define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
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#define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
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#endif
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#define INT_SWAP(type, var) \
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((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
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((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
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((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
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(var))))
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/*
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* get and set integers from potentially unaligned locations
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*/
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#define INT_GET_UNALIGNED_16_BE(pointer) \
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((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
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#define INT_SET_UNALIGNED_16_BE(pointer,value) \
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{ \
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((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
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((__u8*)(pointer))[1] = (((value) ) & 0xff); \
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}
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/* define generic INT_ macros */
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#define INT_GET(reference,arch) \
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(((arch) == ARCH_NOCONVERT) \
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? \
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(reference) \
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: \
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INT_SWAP((reference),(reference)) \
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)
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/* does not return a value */
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#define INT_SET(reference,arch,valueref) \
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(__builtin_constant_p(valueref) ? \
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(void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
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(void)( \
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((reference) = (valueref)), \
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( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
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) \
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)
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/* does not return a value */
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#define INT_MOD_EXPR(reference,arch,code) \
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(((arch) == ARCH_NOCONVERT) \
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? \
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(void)((reference) code) \
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: \
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(void)( \
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(reference) = INT_GET((reference),arch) , \
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((reference) code), \
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INT_SET(reference, arch, reference) \
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) \
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)
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/* does not return a value */
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#define INT_MOD(reference,arch,delta) \
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(void)( \
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INT_MOD_EXPR(reference,arch,+=(delta)) \
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)
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/*
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* INT_COPY - copy a value between two locations with the
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* _same architecture_ but _potentially different sizes_
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*
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* if the types of the two parameters are equal or they are
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* in native architecture, a simple copy is done
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*
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* otherwise, architecture conversions are done
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*
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*/
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/* does not return a value */
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#define INT_COPY(dst,src,arch) \
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( \
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((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
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? \
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(void)((dst) = (src)) \
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: \
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INT_SET(dst, arch, INT_GET(src, arch)) \
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)
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/*
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* INT_XLATE - copy a value in either direction between two locations
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* with different architectures
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*
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* dir < 0 - copy from memory to buffer (native to arch)
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* dir > 0 - copy from buffer to memory (arch to native)
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*/
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/* does not return a value */
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#define INT_XLATE(buf,mem,dir,arch) {\
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ASSERT(dir); \
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if (dir>0) { \
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(mem)=INT_GET(buf, arch); \
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} else { \
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INT_SET(buf, arch, mem); \
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} \
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}
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static inline void be16_add(__be16 *a, __s16 b)
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{
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*a = cpu_to_be16(be16_to_cpu(*a) + b);
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}
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static inline void be32_add(__be32 *a, __s32 b)
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{
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*a = cpu_to_be32(be32_to_cpu(*a) + b);
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}
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static inline void be64_add(__be64 *a, __s64 b)
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{
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*a = cpu_to_be64(be64_to_cpu(*a) + b);
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}
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/*
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* In directories inode numbers are stored as unaligned arrays of unsigned
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* 8bit integers on disk.
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*
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* For v1 directories or v2 directories that contain inode numbers that
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* do not fit into 32bit the array has eight members, but the first member
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* is always zero:
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*
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* |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
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*
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* For v2 directories that only contain entries with inode numbers that fit
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* into 32bits a four-member array is used:
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*
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* |24-31|16-23| 8-15| 0- 7|
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*/
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#define XFS_GET_DIR_INO4(di) \
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(((u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
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#define XFS_PUT_DIR_INO4(from, di) \
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do { \
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(di).i[0] = (((from) & 0xff000000ULL) >> 24); \
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(di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
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(di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
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(di).i[3] = ((from) & 0x000000ffULL); \
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} while (0)
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#define XFS_DI_HI(di) \
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(((u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
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#define XFS_DI_LO(di) \
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(((u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
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#define XFS_GET_DIR_INO8(di) \
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(((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
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((xfs_ino_t)XFS_DI_HI(di) << 32))
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#define XFS_PUT_DIR_INO8(from, di) \
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do { \
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(di).i[0] = 0; \
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(di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
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(di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
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(di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
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(di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
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(di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
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(di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
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(di).i[7] = ((from) & 0x00000000000000ffULL); \
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} while (0)
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#endif /* __XFS_ARCH_H__ */
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