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* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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* For further information regarding this notice, see:
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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#ifndef __XFS_SUPPORT_ARCH_H__
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#define __XFS_SUPPORT_ARCH_H__
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#include <asm/byteorder.h>
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#ifdef __LITTLE_ENDIAN
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# define __BYTE_ORDER __LITTLE_ENDIAN
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# define __BYTE_ORDER __BIG_ENDIAN
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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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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define ARCH_CONVERT 0
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#define ARCH_CONVERT ARCH_NOCONVERT
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/* generic swapping macros */
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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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#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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#define INT_SWAP_UNALIGNED_32(from,to) \
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((__u8*)(to))[0] = ((__u8*)(from))[3]; \
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((__u8*)(to))[1] = ((__u8*)(from))[2]; \
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((__u8*)(to))[2] = ((__u8*)(from))[1]; \
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((__u8*)(to))[3] = ((__u8*)(from))[0]; \
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#define INT_SWAP_UNALIGNED_64(from,to) \
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INT_SWAP_UNALIGNED_32( ((__u8*)(from)) + 4, ((__u8*)(to))); \
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INT_SWAP_UNALIGNED_32( ((__u8*)(from)), ((__u8*)(to)) + 4); \
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* get and set integers from potentially unaligned locations
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#define INT_GET_UNALIGNED_16_LE(pointer) \
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((__u16)((((__u8*)(pointer))[0] ) | (((__u8*)(pointer))[1] << 8 )))
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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_LE(pointer,value) \
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((__u8*)(pointer))[0] = (((value) ) & 0xff); \
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((__u8*)(pointer))[1] = (((value) >> 8) & 0xff); \
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#define INT_SET_UNALIGNED_16_BE(pointer,value) \
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((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
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((__u8*)(pointer))[1] = (((value) ) & 0xff); \
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#define INT_GET_UNALIGNED_32_LE(pointer) \
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((__u32)((((__u8*)(pointer))[0] ) | (((__u8*)(pointer))[1] << 8 ) \
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|(((__u8*)(pointer))[2] << 16) | (((__u8*)(pointer))[3] << 24)))
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#define INT_GET_UNALIGNED_32_BE(pointer) \
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((__u32)((((__u8*)(pointer))[0] << 24) | (((__u8*)(pointer))[1] << 16) \
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|(((__u8*)(pointer))[2] << 8) | (((__u8*)(pointer))[3] )))
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#define INT_GET_UNALIGNED_64_LE(pointer) \
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(((__u64)(INT_GET_UNALIGNED_32_LE(((__u8*)(pointer))+4)) << 32 ) \
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|((__u64)(INT_GET_UNALIGNED_32_LE(((__u8*)(pointer)) )) ))
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#define INT_GET_UNALIGNED_64_BE(pointer) \
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(((__u64)(INT_GET_UNALIGNED_32_BE(((__u8*)(pointer)) )) << 32 ) \
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|((__u64)(INT_GET_UNALIGNED_32_BE(((__u8*)(pointer))+4)) ))
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* now pick the right ones for our MACHINE ARCHITECTURE
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define INT_GET_UNALIGNED_16(pointer) INT_GET_UNALIGNED_16_LE(pointer)
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#define INT_SET_UNALIGNED_16(pointer,value) INT_SET_UNALIGNED_16_LE(pointer,value)
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#define INT_GET_UNALIGNED_32(pointer) INT_GET_UNALIGNED_32_LE(pointer)
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#define INT_GET_UNALIGNED_64(pointer) INT_GET_UNALIGNED_64_LE(pointer)
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#define INT_GET_UNALIGNED_16(pointer) INT_GET_UNALIGNED_16_BE(pointer)
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#define INT_SET_UNALIGNED_16(pointer,value) INT_SET_UNALIGNED_16_BE(pointer,value)
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#define INT_GET_UNALIGNED_32(pointer) INT_GET_UNALIGNED_32_BE(pointer)
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#define INT_GET_UNALIGNED_64(pointer) INT_GET_UNALIGNED_64_BE(pointer)
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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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INT_SWAP((reference),(reference)) \
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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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((reference) = (valueref)), \
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( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
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/* does not return a value */
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#define INT_MOD_EXPR(reference,arch,code) \
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(void)(((arch) == ARCH_NOCONVERT) \
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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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/* does not return a value */
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#define INT_MOD(reference,arch,delta) \
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INT_MOD_EXPR(reference,arch,+=(delta)) \
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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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* 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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* otherwise, architecture conversions are done
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/* does not return a value */
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#define INT_COPY(dst,src,arch) \
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((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
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INT_SET(dst, arch, INT_GET(src, arch)) \
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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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* 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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/* does not return a value */
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#define INT_XLATE(buf,mem,dir,arch) {\
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(mem)=INT_GET(buf, arch); \
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INT_SET(buf, arch, mem); \
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#define INT_ISZERO(reference,arch) \
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#define INT_ZERO(reference,arch) \
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#define INT_GET_UNALIGNED_16_ARCH(pointer,arch) \
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( ((arch) == ARCH_NOCONVERT) \
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(INT_GET_UNALIGNED_16(pointer)) \
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(INT_GET_UNALIGNED_16_BE(pointer)) \
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#define INT_SET_UNALIGNED_16_ARCH(pointer,value,arch) \
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if ((arch) == ARCH_NOCONVERT) { \
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INT_SET_UNALIGNED_16(pointer,value); \
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INT_SET_UNALIGNED_16_BE(pointer,value); \
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#endif /* __XFS_SUPPORT_ARCH_H__ */
added
removed
include/arch.h
