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/*

 * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of version 2 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.

 *

 * Further, this software is distributed without any warranty that it is

 * free of the rightful claim of any third person regarding infringement

 * or the like.  Any license provided herein, whether implied or

 * otherwise, applies only to this software file.  Patent licenses, if

 * any, provided herein do not apply to combinations of this program with

 * other software, or any other product whatsoever.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write the Free Software Foundation, Inc., 59

 * Temple Place - Suite 330, Boston MA 02111-1307, USA.

 *

 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,

 * Mountain View, CA  94043, or:

 *

 * http://www.sgi.com

 *

 * For further information regarding this notice, see:

 *

 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/

 */

#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 __LITTLE_ENDIAN

# define __BYTE_ORDER   __LITTLE_ENDIAN

#endif

#ifdef __BIG_ENDIAN

# define __BYTE_ORDER   __BIG_ENDIAN

#endif

#endif  /* __KERNEL__ */

/* do we need conversion? */

#define ARCH_NOCONVERT 1

#if __BYTE_ORDER == __LITTLE_ENDIAN

# define ARCH_CONVERT   0

#else

# define ARCH_CONVERT   ARCH_NOCONVERT

#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))))

#define INT_SWAP_UNALIGNED_32(from,to) \

    { \

        ((__u8*)(to))[0] = ((__u8*)(from))[3]; \

        ((__u8*)(to))[1] = ((__u8*)(from))[2]; \

        ((__u8*)(to))[2] = ((__u8*)(from))[1]; \

        ((__u8*)(to))[3] = ((__u8*)(from))[0]; \

    }

#define INT_SWAP_UNALIGNED_64(from,to) \

    { \

        INT_SWAP_UNALIGNED_32( ((__u8*)(from)) + 4, ((__u8*)(to))); \

        INT_SWAP_UNALIGNED_32( ((__u8*)(from)), ((__u8*)(to)) + 4); \

    }

/*

 * get and set integers from potentially unaligned locations

 */

#define INT_GET_UNALIGNED_16_LE(pointer) \

   ((__u16)((((__u8*)(pointer))[0]       ) | (((__u8*)(pointer))[1] << 8 )))

#define INT_GET_UNALIGNED_16_BE(pointer) \

   ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))

#define INT_SET_UNALIGNED_16_LE(pointer,value) \

    { \

        ((__u8*)(pointer))[0] = (((value)     ) & 0xff); \

        ((__u8*)(pointer))[1] = (((value) >> 8) & 0xff); \

    }

#define INT_SET_UNALIGNED_16_BE(pointer,value) \

    { \

        ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \

        ((__u8*)(pointer))[1] = (((value)     ) & 0xff); \

    }

#define INT_GET_UNALIGNED_32_LE(pointer) \

   ((__u32)((((__u8*)(pointer))[0]       ) | (((__u8*)(pointer))[1] << 8 ) \

           |(((__u8*)(pointer))[2] << 16) | (((__u8*)(pointer))[3] << 24)))

#define INT_GET_UNALIGNED_32_BE(pointer) \

   ((__u32)((((__u8*)(pointer))[0] << 24) | (((__u8*)(pointer))[1] << 16) \

           |(((__u8*)(pointer))[2] << 8)  | (((__u8*)(pointer))[3]      )))

#define INT_GET_UNALIGNED_64_LE(pointer) \

   (((__u64)(INT_GET_UNALIGNED_32_LE(((__u8*)(pointer))+4)) << 32 ) \

   |((__u64)(INT_GET_UNALIGNED_32_LE(((__u8*)(pointer))  ))       ))

#define INT_GET_UNALIGNED_64_BE(pointer) \

   (((__u64)(INT_GET_UNALIGNED_32_BE(((__u8*)(pointer))  )) << 32  ) \

   |((__u64)(INT_GET_UNALIGNED_32_BE(((__u8*)(pointer))+4))        ))

/*

 * now pick the right ones for our MACHINE ARCHITECTURE

 */

#if __BYTE_ORDER == __LITTLE_ENDIAN

#define INT_GET_UNALIGNED_16(pointer)       INT_GET_UNALIGNED_16_LE(pointer)

#define INT_SET_UNALIGNED_16(pointer,value) INT_SET_UNALIGNED_16_LE(pointer,value)

#define INT_GET_UNALIGNED_32(pointer)       INT_GET_UNALIGNED_32_LE(pointer)

#define INT_GET_UNALIGNED_64(pointer)       INT_GET_UNALIGNED_64_LE(pointer)

#else

#define INT_GET_UNALIGNED_16(pointer)       INT_GET_UNALIGNED_16_BE(pointer)

#define INT_SET_UNALIGNED_16(pointer,value) INT_SET_UNALIGNED_16_BE(pointer,value)

#define INT_GET_UNALIGNED_32(pointer)       INT_GET_UNALIGNED_32_BE(pointer)

#define INT_GET_UNALIGNED_64(pointer)       INT_GET_UNALIGNED_64_BE(pointer)

#endif

/* 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) \

    (void)(((arch) == ARCH_NOCONVERT) \

        ? \

            ((reference) code) \

        : \

            ( \

                (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) \

    (void)( \

        ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \

            ? \

                ((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); \

    } \

}

#define INT_ISZERO(reference,arch) \

    ((reference) == 0)

#define INT_ZERO(reference,arch) \

    ((reference) = 0)

#define INT_GET_UNALIGNED_16_ARCH(pointer,arch) \

    ( ((arch) == ARCH_NOCONVERT) \

        ? \

            (INT_GET_UNALIGNED_16(pointer)) \

        : \

            (INT_GET_UNALIGNED_16_BE(pointer)) \

    )

#define INT_SET_UNALIGNED_16_ARCH(pointer,value,arch) \

    if ((arch) == ARCH_NOCONVERT) { \

        INT_SET_UNALIGNED_16(pointer,value); \

    } else { \

        INT_SET_UNALIGNED_16_BE(pointer,value); \

    }

#define DIRINO4_GET_ARCH(pointer,arch) \

    ( ((arch) == ARCH_NOCONVERT) \

        ? \

            (INT_GET_UNALIGNED_32(pointer)) \

        : \

            (INT_GET_UNALIGNED_32_BE(pointer)) \

    )

#if XFS_BIG_INUMS

#define DIRINO_GET_ARCH(pointer,arch) \

    ( ((arch) == ARCH_NOCONVERT) \

        ? \

            (INT_GET_UNALIGNED_64(pointer)) \

        : \

            (INT_GET_UNALIGNED_64_BE(pointer)) \

    )

#else

/* MACHINE ARCHITECTURE dependent */

#if __BYTE_ORDER == __LITTLE_ENDIAN

#define DIRINO_GET_ARCH(pointer,arch) \

    DIRINO4_GET_ARCH((((__u8*)pointer)+4),arch)

#else

#define DIRINO_GET_ARCH(pointer,arch) \

    DIRINO4_GET_ARCH(pointer,arch)

#endif

#endif

#define DIRINO_COPY_ARCH(from,to,arch) \

    if ((arch) == ARCH_NOCONVERT) { \

        memcpy(to,from,sizeof(xfs_ino_t)); \

    } else { \

        INT_SWAP_UNALIGNED_64(from,to); \

    }

#define DIRINO4_COPY_ARCH(from,to,arch) \

    if ((arch) == ARCH_NOCONVERT) { \

        memcpy(to,(((__u8*)from+4)),sizeof(xfs_dir2_ino4_t)); \

    } else { \

        INT_SWAP_UNALIGNED_32(from,to); \

    }

#endif  /* __XFS_ARCH_H__ */