endian.h revision 143063
1/*- 2 * Copyright (c) 1987, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)endian.h 7.8 (Berkeley) 4/3/91 30 * $FreeBSD: head/sys/amd64/include/endian.h 143063 2005-03-02 21:33:29Z joerg $ 31 */ 32 33#ifndef _MACHINE_ENDIAN_H_ 34#define _MACHINE_ENDIAN_H_ 35 36#include <sys/cdefs.h> 37#include <sys/_types.h> 38 39/* 40 * Define the order of 32-bit words in 64-bit words. 41 */ 42#define _QUAD_HIGHWORD 1 43#define _QUAD_LOWWORD 0 44 45/* 46 * Definitions for byte order, according to byte significance from low 47 * address to high. 48 */ 49#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 50#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 51#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 52 53#define _BYTE_ORDER _LITTLE_ENDIAN 54 55/* 56 * Deprecated variants that don't have enough underscores to be useful in more 57 * strict namespaces. 58 */ 59#if __BSD_VISIBLE 60#define LITTLE_ENDIAN _LITTLE_ENDIAN 61#define BIG_ENDIAN _BIG_ENDIAN 62#define PDP_ENDIAN _PDP_ENDIAN 63#define BYTE_ORDER _BYTE_ORDER 64#endif 65 66#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 67 68#define __word_swap_int_var(x) \ 69__extension__ ({ register __uint32_t __X = (x); \ 70 __asm ("rorl $16, %0" : "+r" (__X)); \ 71 __X; }) 72 73#ifdef __OPTIMIZE__ 74 75#define __word_swap_int_const(x) \ 76 ((((x) & 0xffff0000) >> 16) | \ 77 (((x) & 0x0000ffff) << 16)) 78#define __word_swap_int(x) (__builtin_constant_p(x) ? \ 79 __word_swap_int_const(x) : __word_swap_int_var(x)) 80 81#else /* __OPTIMIZE__ */ 82 83#define __word_swap_int(x) __word_swap_int_var(x) 84 85#endif /* __OPTIMIZE__ */ 86 87#define __byte_swap_int_var(x) \ 88__extension__ ({ register __uint32_t __X = (x); \ 89 __asm ("bswap %0" : "+r" (__X)); \ 90 __X; }) 91 92#ifdef __OPTIMIZE__ 93 94#define __byte_swap_int_const(x) \ 95 ((((x) & 0xff000000) >> 24) | \ 96 (((x) & 0x00ff0000) >> 8) | \ 97 (((x) & 0x0000ff00) << 8) | \ 98 (((x) & 0x000000ff) << 24)) 99#define __byte_swap_int(x) (__builtin_constant_p(x) ? \ 100 __byte_swap_int_const(x) : __byte_swap_int_var(x)) 101 102#else /* __OPTIMIZE__ */ 103 104#define __byte_swap_int(x) __byte_swap_int_var(x) 105 106#endif /* __OPTIMIZE__ */ 107 108#define __byte_swap_long_var(x) \ 109__extension__ ({ register __uint64_t __X = (x); \ 110 __asm ("bswap %0" : "+r" (__X)); \ 111 __X; }) 112 113#ifdef __OPTIMIZE__ 114 115#define __byte_swap_long_const(x) \ 116 (((x >> 56) | \ 117 ((x >> 40) & 0xff00) | \ 118 ((x >> 24) & 0xff0000) | \ 119 ((x >> 8) & 0xff000000) | \ 120 ((x << 8) & (0xfful << 32)) | \ 121 ((x << 24) & (0xfful << 40)) | \ 122 ((x << 40) & (0xfful << 48)) | \ 123 ((x << 56)))) 124 125#define __byte_swap_long(x) (__builtin_constant_p(x) ? \ 126 __byte_swap_long_const(x) : __byte_swap_long_var(x)) 127 128#else /* __OPTIMIZE__ */ 129 130#define __byte_swap_long(x) __byte_swap_long_var(x) 131 132#endif /* __OPTIMIZE__ */ 133 134#define __byte_swap_word_var(x) \ 135__extension__ ({ register __uint16_t __X = (x); \ 136 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \ 137 __X; }) 138 139#ifdef __OPTIMIZE__ 140 141#define __byte_swap_word_const(x) \ 142 ((((x) & 0xff00) >> 8) | \ 143 (((x) & 0x00ff) << 8)) 144 145#define __byte_swap_word(x) (__builtin_constant_p(x) ? \ 146 __byte_swap_word_const(x) : __byte_swap_word_var(x)) 147 148#else /* __OPTIMIZE__ */ 149 150#define __byte_swap_word(x) __byte_swap_word_var(x) 151 152#endif /* __OPTIMIZE__ */ 153 154static __inline __uint64_t 155__bswap64(__uint64_t _x) 156{ 157 158 return (__byte_swap_long(_x)); 159} 160 161static __inline __uint32_t 162__bswap32(__uint32_t _x) 163{ 164 165 return (__byte_swap_int(_x)); 166} 167 168static __inline __uint16_t 169__bswap16(__uint16_t _x) 170{ 171 172 return (__byte_swap_word(_x)); 173} 174 175#define __htonl(x) __bswap32(x) 176#define __htons(x) __bswap16(x) 177#define __ntohl(x) __bswap32(x) 178#define __ntohs(x) __bswap16(x) 179 180#else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */ 181 182/* 183 * No optimizations are available for this compiler. Fall back to 184 * non-optimized functions by defining the constant usually used to prevent 185 * redefinition. 186 */ 187#define _BYTEORDER_FUNC_DEFINED 188 189#endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */ 190 191#endif /* !_MACHINE_ENDIAN_H_ */ 192