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