endian.h revision 233684
1193326Sed/*- 2193326Sed * Copyright (c) 1987, 1991 Regents of the University of California. 3193326Sed * All rights reserved. 4193326Sed * 5193326Sed * Redistribution and use in source and binary forms, with or without 6193326Sed * modification, are permitted provided that the following conditions 7193326Sed * are met: 8193326Sed * 1. Redistributions of source code must retain the above copyright 9193326Sed * notice, this list of conditions and the following disclaimer. 10193326Sed * 2. Redistributions in binary form must reproduce the above copyright 11193326Sed * notice, this list of conditions and the following disclaimer in the 12193326Sed * documentation and/or other materials provided with the distribution. 13193326Sed * 4. Neither the name of the University nor the names of its contributors 14193326Sed * may be used to endorse or promote products derived from this software 15193326Sed * without specific prior written permission. 16193326Sed * 17193326Sed * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18201361Srdivacky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19193326Sed * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20193326Sed * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21193326Sed * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22193326Sed * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23199482Srdivacky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24193326Sed * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25193326Sed * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26193326Sed * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27193326Sed * SUCH DAMAGE. 28193326Sed * 29193326Sed * @(#)endian.h 7.8 (Berkeley) 4/3/91 30193326Sed * $FreeBSD: head/sys/x86/include/endian.h 233684 2012-03-29 23:31:48Z dim $ 31193326Sed */ 32193326Sed 33193326Sed#ifndef _MACHINE_ENDIAN_H_ 34207619Srdivacky#define _MACHINE_ENDIAN_H_ 35207619Srdivacky 36207619Srdivacky#include <sys/cdefs.h> 37207619Srdivacky#include <sys/_types.h> 38207619Srdivacky 39207619Srdivacky/* 40207619Srdivacky * Define the order of 32-bit words in 64-bit words. 41207619Srdivacky */ 42207619Srdivacky#define _QUAD_HIGHWORD 1 43207619Srdivacky#define _QUAD_LOWWORD 0 44207619Srdivacky 45207619Srdivacky/* 46207619Srdivacky * Definitions for byte order, according to byte significance from low 47207619Srdivacky * address to high. 48207619Srdivacky */ 49193326Sed#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 50207619Srdivacky#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 51207619Srdivacky#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 52207619Srdivacky 53207619Srdivacky#define _BYTE_ORDER _LITTLE_ENDIAN 54207619Srdivacky 55207619Srdivacky/* 56207619Srdivacky * Deprecated variants that don't have enough underscores to be useful in more 57207619Srdivacky * strict namespaces. 58207619Srdivacky */ 59207619Srdivacky#if __BSD_VISIBLE 60207619Srdivacky#define LITTLE_ENDIAN _LITTLE_ENDIAN 61207619Srdivacky#define BIG_ENDIAN _BIG_ENDIAN 62207619Srdivacky#define PDP_ENDIAN _PDP_ENDIAN 63207619Srdivacky#define BYTE_ORDER _BYTE_ORDER 64207619Srdivacky#endif 65207619Srdivacky 66207619Srdivacky#define __bswap16_gen(x) (__uint16_t)((x) << 8 | (x) >> 8) 67207619Srdivacky#define __bswap32_gen(x) \ 68207619Srdivacky (((__uint32_t)__bswap16((x) & 0xffff) << 16) | __bswap16((x) >> 16)) 69207619Srdivacky#define __bswap64_gen(x) \ 70207619Srdivacky (((__uint64_t)__bswap32((x) & 0xffffffff) << 32) | __bswap32((x) >> 32)) 71207619Srdivacky 72193326Sed#ifdef __GNUCLIKE_BUILTIN_CONSTANT_P 73193326Sed#define __bswap16(x) \ 74193326Sed ((__uint16_t)(__builtin_constant_p(x) ? \ 75198092Srdivacky __bswap16_gen((__uint16_t)(x)) : __bswap16_var(x))) 76193326Sed#define __bswap32(x) \ 77199990Srdivacky (__builtin_constant_p(x) ? \ 78199990Srdivacky __bswap32_gen((__uint32_t)(x)) : __bswap32_var(x)) 79199990Srdivacky#define __bswap64(x) \ 80207619Srdivacky (__builtin_constant_p(x) ? \ 81200583Srdivacky __bswap64_gen((__uint64_t)(x)) : __bswap64_var(x)) 82193326Sed#else 83193326Sed/* XXX these are broken for use in static initializers. */ 84198092Srdivacky#define __bswap16(x) __bswap16_var(x) 85193326Sed#define __bswap32(x) __bswap32_var(x) 86193326Sed#define __bswap64(x) __bswap64_var(x) 87198092Srdivacky#endif 88193326Sed 89193326Sed/* These are defined as functions to avoid multiple evaluation of x. */ 90193326Sed 91198092Srdivackystatic __inline __uint16_t 92193326Sed__bswap16_var(__uint16_t _x) 93193326Sed{ 94193326Sed 95198092Srdivacky return (__bswap16_gen(_x)); 96193326Sed} 97193326Sed 98193326Sedstatic __inline __uint32_t 99193326Sed__bswap32_var(__uint32_t _x) 100193326Sed{ 101193326Sed 102193326Sed#ifdef __GNUCLIKE_ASM 103193326Sed __asm("bswap %0" : "+r" (_x)); 104193326Sed return (_x); 105195341Sed#else 106193326Sed return (__bswap32_gen(_x)); 107198092Srdivacky#endif 108193326Sed} 109193326Sed 110193326Sedstatic __inline __uint64_t 111193326Sed__bswap64_var(__uint64_t _x) 112193326Sed{ 113203955Srdivacky 114203955Srdivacky#if defined(__amd64__) && defined(__GNUCLIKE_ASM) 115203955Srdivacky __asm("bswap %0" : "+r" (_x)); 116203955Srdivacky return (_x); 117203955Srdivacky#else 118203955Srdivacky /* 119203955Srdivacky * It is important for the optimizations that the following is not 120203955Srdivacky * really generic, but expands to 2 __bswap32_var()'s. 121203955Srdivacky */ 122203955Srdivacky return (__bswap64_gen(_x)); 123203955Srdivacky#endif 124203955Srdivacky} 125203955Srdivacky 126203955Srdivacky#define __htonl(x) __bswap32(x) 127203955Srdivacky#define __htons(x) __bswap16(x) 128193326Sed#define __ntohl(x) __bswap32(x) 129193326Sed#define __ntohs(x) __bswap16(x) 130193326Sed 131193326Sed#endif /* !_MACHINE_ENDIAN_H_ */ 132193326Sed