138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/* $NetBSD: endian.h,v 1.18 1996/05/08 20:00:38 jtc Exp $ */
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/*
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* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
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* Copyright (c) 1987, 1991 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)endian.h 7.8 (Berkeley) 4/3/91
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*/
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#ifndef _I386_ENDIAN_H_
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#define _I386_ENDIAN_H_
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/*
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* Define the order of 32-bit words in 64-bit words.
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*/
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#define _QUAD_HIGHWORD 1
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#define _QUAD_LOWWORD 0
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#ifndef _POSIX_SOURCE
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/*
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* Definitions for byte order, according to byte significance from low
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* address to high.
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*/
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#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
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#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
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#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
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#define BYTE_ORDER LITTLE_ENDIAN
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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unsigned long htonl __P((unsigned long));
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unsigned short htons __P((unsigned short));
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unsigned long ntohl __P((unsigned long));
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unsigned short ntohs __P((unsigned short));
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__END_DECLS
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#ifdef __GNUC__
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#if defined(_KERNEL) && !defined(I386_CPU)
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#define __byte_swap_long_variable(x) \
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({ register unsigned long __x = (x); \
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__asm ("bswap %1" \
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: "=r" (__x) \
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: "0" (__x)); \
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__x; })
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#else
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#define __byte_swap_long_variable(x) \
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({ register unsigned long __x = (x); \
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__asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \
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: "=r" (__x) \
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: "0" (__x)); \
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__x; })
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#endif /* _KERNEL && ... */
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#define __byte_swap_word_variable(x) \
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({ register unsigned short __x = (x); \
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__asm ("rorw $8, %w1" \
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: "=r" (__x) \
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: "0" (__x)); \
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__x; })
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#ifdef __OPTIMIZE__
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#define __byte_swap_long_constant(x) \
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((((x) & 0xff000000) >> 24) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x000000ff) << 24))
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#define __byte_swap_word_constant(x) \
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((((x) & 0xff00) >> 8) | \
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(((x) & 0x00ff) << 8))
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#define __byte_swap_long(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_long_constant(x) : __byte_swap_long_variable(x))
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#define __byte_swap_word(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_word_constant(x) : __byte_swap_word_variable(x))
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#else /* __OPTIMIZE__ */
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#define __byte_swap_long(x) __byte_swap_long_variable(x)
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#define __byte_swap_word(x) __byte_swap_word_variable(x)
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#endif /* __OPTIMIZE__ */
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#define ntohl(x) __byte_swap_long(x)
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#define ntohs(x) __byte_swap_word(x)
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#define htonl(x) __byte_swap_long(x)
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#define htons(x) __byte_swap_word(x)
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#endif /* __GNUC__ */
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/*
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* Macros for network/external number representation conversion.
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*/
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#define NTOHL(x) (x) = ntohl((unsigned long)(x))
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#define NTOHS(x) (x) = ntohs((unsigned short)(x))
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#define HTONL(x) (x) = htonl((unsigned long)(x))
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#define HTONS(x) (x) = htons((unsigned short)(x))
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#endif /* _POSIX_SOURCE */
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#endif /* !_I386_ENDIAN_H_ */
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