endian.h revision 4
1219019Sgabor/* 2219019Sgabor * Copyright (c) 1987, 1991 Regents of the University of California. 3219019Sgabor * All rights reserved. 4219019Sgabor * 5219019Sgabor * Redistribution and use in source and binary forms, with or without 6219019Sgabor * modification, are permitted provided that the following conditions 7219019Sgabor * are met: 8219019Sgabor * 1. Redistributions of source code must retain the above copyright 9219019Sgabor * notice, this list of conditions and the following disclaimer. 10219019Sgabor * 2. Redistributions in binary form must reproduce the above copyright 11219019Sgabor * notice, this list of conditions and the following disclaimer in the 12219019Sgabor * documentation and/or other materials provided with the distribution. 13219019Sgabor * 3. All advertising materials mentioning features or use of this software 14219019Sgabor * must display the following acknowledgement: 15219019Sgabor * This product includes software developed by the University of 16219019Sgabor * California, Berkeley and its contributors. 17219019Sgabor * 4. Neither the name of the University nor the names of its contributors 18219019Sgabor * may be used to endorse or promote products derived from this software 19219019Sgabor * without specific prior written permission. 20219019Sgabor * 21219019Sgabor * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22219019Sgabor * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23219019Sgabor * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24219019Sgabor * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25219019Sgabor * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26219019Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27219019Sgabor * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28219019Sgabor * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29219019Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30219019Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31219019Sgabor * SUCH DAMAGE. 32219019Sgabor * 33219019Sgabor * @(#)endian.h 7.8 (Berkeley) 4/3/91 34219019Sgabor * 35219019Sgabor * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE 36219019Sgabor * -------------------- ----- ---------------------- 37219019Sgabor * CURRENT PATCH LEVEL: 1 00093 38219019Sgabor * -------------------- ----- ---------------------- 39219019Sgabor * 40219019Sgabor * 27 Feb 93 Charles Hannum Better byte-swapping macros for 41219019Sgabor * i386/i486. 42219019Sgabor */ 43219019Sgabor 44219019Sgabor/* 45219019Sgabor * Definitions for byte order, according to byte significance from low 46219019Sgabor * address to high. 47219019Sgabor */ 48219019Sgabor#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 49219019Sgabor#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 50219019Sgabor#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 51219019Sgabor 52219019Sgabor#define BYTE_ORDER LITTLE_ENDIAN 53219019Sgabor 54219019Sgabor#ifndef KERNEL 55219019Sgabor#include <sys/cdefs.h> 56219019Sgabor#endif 57219019Sgabor 58219019Sgabor#define __word_swap_long(x) \ 59219019Sgabor({ register u_long X = (x); \ 60219019Sgabor asm ("rorl $16, %1" \ 61219019Sgabor : "=r" (X) \ 62219019Sgabor : "0" (X)); \ 63219019Sgabor X; }) 64219019Sgabor#if __GNUC__ >= 2 65219019Sgabor#define __byte_swap_long(x) \ 66219019Sgabor({ register u_long X = (x); \ 67219019Sgabor asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ 68219019Sgabor : "=q" (X) \ 69219019Sgabor : "0" (X)); \ 70219019Sgabor X; }) 71219019Sgabor#define __byte_swap_word(x) \ 72219019Sgabor({ register u_short X = (x); \ 73219019Sgabor asm ("xchgb %h1, %b1" \ 74219019Sgabor : "=q" (X) \ 75219019Sgabor : "0" (X)); \ 76219019Sgabor X; }) 77219019Sgabor#else /* __GNUC__ >= 2 */ 78219019Sgabor#define __byte_swap_long(x) \ 79219019Sgabor({ register u_long X = (x); \ 80219019Sgabor asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 81219019Sgabor : "=r" (X) \ 82219019Sgabor : "0" (X)); \ 83219019Sgabor X; }) 84219019Sgabor#define __byte_swap_word(x) \ 85219019Sgabor({ register u_short X = (x); \ 86219019Sgabor asm ("rorw $8, %w1" \ 87219019Sgabor : "=r" (X) \ 88219019Sgabor : "0" (X)); \ 89219019Sgabor X; }) 90219019Sgabor#endif /* __GNUC__ >= 2 */ 91219019Sgabor 92219019Sgabor/* 93219019Sgabor * Macros for network/external number representation conversion. 94219019Sgabor */ 95219019Sgabor#if BYTE_ORDER == BIG_ENDIAN && !defined(lint) 96219019Sgabor#define ntohl(x) (x) 97219019Sgabor#define ntohs(x) (x) 98219019Sgabor#define htonl(x) (x) 99219019Sgabor#define htons(x) (x) 100219019Sgabor 101219019Sgabor#define NTOHL(x) (x) 102219019Sgabor#define NTOHS(x) (x) 103219019Sgabor#define HTONL(x) (x) 104219019Sgabor#define HTONS(x) (x) 105219019Sgabor 106219019Sgabor#else 107219019Sgabor 108219019Sgabor#define ntohl __byte_swap_long 109219019Sgabor#define ntohs __byte_swap_word 110219019Sgabor#define htonl __byte_swap_long 111219019Sgabor#define htons __byte_swap_word 112219019Sgabor 113219019Sgabor#define NTOHL(x) (x) = ntohl((u_long)x) 114219019Sgabor#define NTOHS(x) (x) = ntohs((u_short)x) 115219019Sgabor#define HTONL(x) (x) = htonl((u_long)x) 116219019Sgabor#define HTONS(x) (x) = htons((u_short)x) 117250984Sed#endif 118219019Sgabor