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/*

 * 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

#ifdef XFS_NATIVE_HOST

#define cpu_to_be16(val)        ((__be16)(val))

#define cpu_to_be32(val)        ((__be32)(val))

#define cpu_to_be64(val)        ((__be64)(val))

#define be16_to_cpu(val)        ((__uint16_t)(val))

#define be32_to_cpu(val)        ((__uint32_t)(val))

#define be64_to_cpu(val)        ((__uint64_t)(val))

#else

#define cpu_to_be16(val)        (__swab16((__uint16_t)(val)))

#define cpu_to_be32(val)        (__swab32((__uint32_t)(val)))

#define cpu_to_be64(val)        (__swab64((__uint64_t)(val)))

#define be16_to_cpu(val)        (__swab16((__be16)(val)))

#define be32_to_cpu(val)        (__swab32((__be32)(val)))

#define be64_to_cpu(val)        (__swab64((__be64)(val)))

#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); \

    } \

}

static inline void be16_add(__be16 *a, __s16 b)

{

        *a = cpu_to_be16(be16_to_cpu(*a) + b);

}

static inline void be32_add(__be32 *a, __s32 b)

{

        *a = cpu_to_be32(be32_to_cpu(*a) + b);

}

static inline void be64_add(__be64 *a, __s64 b)

{

        *a = cpu_to_be64(be64_to_cpu(*a) + b);

}

/*

 * 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__ */