190868Smike/*- 270576Sobrien * Copyright (c) 1987, 1991, 1993 370576Sobrien * The Regents of the University of California. All rights reserved. 470576Sobrien * 570576Sobrien * Redistribution and use in source and binary forms, with or without 670576Sobrien * modification, are permitted provided that the following conditions 770576Sobrien * are met: 870576Sobrien * 1. Redistributions of source code must retain the above copyright 970576Sobrien * notice, this list of conditions and the following disclaimer. 1070576Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1170576Sobrien * notice, this list of conditions and the following disclaimer in the 1270576Sobrien * documentation and/or other materials provided with the distribution. 1370576Sobrien * 4. Neither the name of the University nor the names of its contributors 1470576Sobrien * may be used to endorse or promote products derived from this software 1570576Sobrien * without specific prior written permission. 1670576Sobrien * 1770576Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1870576Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1970576Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2070576Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2170576Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2270576Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2370576Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2470576Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2570576Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2670576Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2770576Sobrien * SUCH DAMAGE. 2870576Sobrien * 2970576Sobrien * @(#)endian.h 8.1 (Berkeley) 6/10/93 3070576Sobrien * $FreeBSD$ 3170576Sobrien */ 3270576Sobrien 3390868Smike#ifndef _MACHINE_ENDIAN_H_ 3490868Smike#define _MACHINE_ENDIAN_H_ 3570576Sobrien 3694512Smike#include <sys/cdefs.h> 37102227Smike#include <sys/_types.h> 3890868Smike 3970576Sobrien/* 4070576Sobrien * Define the order of 32-bit words in 64-bit words. 4170576Sobrien */ 4270576Sobrien#define _QUAD_HIGHWORD 0 4370576Sobrien#define _QUAD_LOWWORD 1 4470576Sobrien 4570576Sobrien/* 46184460Smarcel * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__ 47184460Smarcel * and __LITTLE_ENDIAN__ (resp). 48184460Smarcel */ 49184460Smarcel#ifdef _BIG_ENDIAN 50184460Smarcel#undef _BIG_ENDIAN 51184460Smarcel#endif 52184460Smarcel#ifdef _LITTLE_ENDIAN 53184460Smarcel#undef _LITTLE_ENDIAN 54184460Smarcel#endif 55184460Smarcel 56184460Smarcel/* 5770576Sobrien * Definitions for byte order, according to byte significance from low 5870576Sobrien * address to high. 5970576Sobrien */ 6094362Smike#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 6194362Smike#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 6294362Smike#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 6370576Sobrien 64184460Smarcel#ifdef __LITTLE_ENDIAN__ 65184460Smarcel#define _BYTE_ORDER _LITTLE_ENDIAN 66184460Smarcel#else 6794362Smike#define _BYTE_ORDER _BIG_ENDIAN 68184460Smarcel#endif 6970576Sobrien 7094362Smike/* 7194362Smike * Deprecated variants that don't have enough underscores to be useful in more 7294362Smike * strict namespaces. 7394362Smike */ 7494362Smike#if __BSD_VISIBLE 7594362Smike#define LITTLE_ENDIAN _LITTLE_ENDIAN 7694362Smike#define BIG_ENDIAN _BIG_ENDIAN 7794362Smike#define PDP_ENDIAN _PDP_ENDIAN 7894362Smike#define BYTE_ORDER _BYTE_ORDER 7994362Smike#endif 8094362Smike 81216122Snwhitehorn#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 82216122Snwhitehorn#define __is_constant(x) __builtin_constant_p(x) 83216122Snwhitehorn#else 84216122Snwhitehorn#define __is_constant(x) 0 85216122Snwhitehorn#endif 8670576Sobrien 87216122Snwhitehorn#define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \ 88216122Snwhitehorn (((__uint16_t)(x) << 8) & 0xff00)) 89216122Snwhitehorn#define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \ 90216122Snwhitehorn (((__uint32_t)(x) >> 8) & 0xff00) | \ 91216122Snwhitehorn (((__uint32_t)(x)<< 8) & 0xff0000) | \ 92216122Snwhitehorn (((__uint32_t)(x) << 24) & 0xff000000)) 93216122Snwhitehorn#define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \ 94216122Snwhitehorn (((__uint64_t)(x) >> 40) & 0xff00) | \ 95216122Snwhitehorn (((__uint64_t)(x) >> 24) & 0xff0000) | \ 96216122Snwhitehorn (((__uint64_t)(x) >> 8) & 0xff000000) | \ 97216122Snwhitehorn (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \ 98216122Snwhitehorn (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \ 99216122Snwhitehorn (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \ 100216122Snwhitehorn (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56))) 101216122Snwhitehorn 10291959Smikestatic __inline __uint16_t 103216122Snwhitehorn__bswap16_var(__uint16_t _x) 10491959Smike{ 10591959Smike 10691959Smike return ((_x >> 8) | ((_x << 8) & 0xff00)); 10791959Smike} 10891959Smike 10991959Smikestatic __inline __uint32_t 110216122Snwhitehorn__bswap32_var(__uint32_t _x) 11191959Smike{ 11291959Smike 11391959Smike return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 11491959Smike ((_x << 24) & 0xff000000)); 11591959Smike} 11691959Smike 11791959Smikestatic __inline __uint64_t 118216122Snwhitehorn__bswap64_var(__uint64_t _x) 11991959Smike{ 12091959Smike 12191959Smike return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 12291959Smike ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 12391959Smike ((_x << 24) & ((__uint64_t)0xff << 40)) | 12491959Smike ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 12591959Smike} 12691959Smike 127233349Sdim#define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \ 128233349Sdim __bswap16_var(x))) 129216122Snwhitehorn#define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \ 130216122Snwhitehorn __bswap32_var(x)) 131216122Snwhitehorn#define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \ 132216122Snwhitehorn __bswap64_var(x)) 133216122Snwhitehorn 13491959Smike#define __htonl(x) ((__uint32_t)(x)) 13591959Smike#define __htons(x) ((__uint16_t)(x)) 13691959Smike#define __ntohl(x) ((__uint32_t)(x)) 13791959Smike#define __ntohs(x) ((__uint16_t)(x)) 13891959Smike 13990868Smike#endif /* !_MACHINE_ENDIAN_H_ */ 140