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/*
* Copyright (c) 2000 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_SUPPORT_ARCH_H__
#define __XFS_SUPPORT_ARCH_H__
#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 */
#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))))
#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); \
}
#endif /* __XFS_SUPPORT_ARCH_H__ */
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