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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [machine/] [i386/] [include/] [endian.h] - Rev 207
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/* * Copyright (c) 1987, 1991 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)endian.h 7.8 (Berkeley) 4/3/91 * $Id: endian.h 207 2010-07-19 17:43:24Z jeremybennett $ */ #ifndef _MACHINE_ENDIAN_H_ #define _MACHINE_ENDIAN_H_ /* * Define the order of 32-bit words in 64-bit words. */ #define _QUAD_HIGHWORD 1 #define _QUAD_LOWWORD 0 /* * Definitions for byte order, according to byte significance from low * address to high. */ #ifndef LITTLE_ENDIAN #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ #endif #ifndef BIG_ENDIAN #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ #endif #ifndef PDP_ENDIAN #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ #endif #ifndef BYTE_ORDER #define BYTE_ORDER LITTLE_ENDIAN #endif #ifndef KERNEL #include <sys/cdefs.h> #endif #include <sys/types.h> __BEGIN_DECLS unsigned long htonl __P((unsigned long)); unsigned short htons __P((unsigned short)); unsigned long ntohl __P((unsigned long)); unsigned short ntohs __P((unsigned short)); __END_DECLS #define __word_swap_long(x) \ __extension__ ({ register u_long __X = (x); \ __asm ("rorl $16, %1" \ : "=r" (__X) \ : "0" (__X)); \ __X; }) #if defined(KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU) #define __byte_swap_long(x) \ __extension__ ({ register u_long __X = (x); \ __asm ("bswap %0" \ : "=r" (__X) \ : "0" (__X)); \ __X; }) #else #define __byte_swap_long(x) \ __extension__ ({ register u_long __X = (x); \ __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ : "=q" (__X) \ : "0" (__X)); \ __X; }) #endif #define __byte_swap_word(x) \ __extension__ ({ register u_short __X = (x); \ __asm ("xchgb %h1, %b1" \ : "=q" (__X) \ : "0" (__X)); \ __X; }) /* * Macros for network/external number representation conversion. */ #ifdef __GNUC__ #define ntohl __byte_swap_long #define ntohs __byte_swap_word #define htonl __byte_swap_long #define htons __byte_swap_word #endif #define NTOHL(x) ((x) = ntohl((u_long)(x))) #define NTOHS(x) ((x) = ntohs((u_short)(x))) #define HTONL(x) ((x) = htonl((u_long)(x))) #define HTONS(x) ((x) = htons((u_short)(x))) #endif /* !_MACHINE_ENDIAN_H_ */