endian.h revision 143429
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 143429 2005-03-11 21:46:01Z peter $ 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#ifdef __cplusplus 40extern "C" { 41#endif 42 43/* 44 * Define the order of 32-bit words in 64-bit words. 45 */ 46#define _QUAD_HIGHWORD 1 47#define _QUAD_LOWWORD 0 48 49/* 50 * Definitions for byte order, according to byte significance from low 51 * address to high. 52 */ 53#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 54#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 55#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 56 57#define _BYTE_ORDER _LITTLE_ENDIAN 58 59/* 60 * Deprecated variants that don't have enough underscores to be useful in more 61 * strict namespaces. 62 */ 63#if __BSD_VISIBLE 64#define LITTLE_ENDIAN _LITTLE_ENDIAN 65#define BIG_ENDIAN _BIG_ENDIAN 66#define PDP_ENDIAN _PDP_ENDIAN 67#define BYTE_ORDER _BYTE_ORDER 68#endif 69 70#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 71 72#define __word_swap_int_var(x) \ 73__extension__ ({ register __uint32_t __X = (x); \ 74 __asm ("rorl $16, %0" : "+r" (__X)); \ 75 __X; }) 76 77#ifdef __OPTIMIZE__ 78 79#define __word_swap_int_const(x) \ 80 ((((x) & 0xffff0000) >> 16) | \ 81 (((x) & 0x0000ffff) << 16)) 82#define __word_swap_int(x) (__builtin_constant_p(x) ? \ 83 __word_swap_int_const(x) : __word_swap_int_var(x)) 84 85#else /* __OPTIMIZE__ */ 86 87#define __word_swap_int(x) __word_swap_int_var(x) 88 89#endif /* __OPTIMIZE__ */ 90 91#define __byte_swap_int_var(x) \ 92__extension__ ({ register __uint32_t __X = (x); \ 93 __asm ("bswap %0" : "+r" (__X)); \ 94 __X; }) 95 96#ifdef __OPTIMIZE__ 97 98#define __byte_swap_int_const(x) \ 99 ((((x) & 0xff000000) >> 24) | \ 100 (((x) & 0x00ff0000) >> 8) | \ 101 (((x) & 0x0000ff00) << 8) | \ 102 (((x) & 0x000000ff) << 24)) 103#define __byte_swap_int(x) (__builtin_constant_p(x) ? \ 104 __byte_swap_int_const(x) : __byte_swap_int_var(x)) 105 106#else /* __OPTIMIZE__ */ 107 108#define __byte_swap_int(x) __byte_swap_int_var(x) 109 110#endif /* __OPTIMIZE__ */ 111 112#define __byte_swap_long_var(x) \ 113__extension__ ({ register __uint64_t __X = (x); \ 114 __asm ("bswap %0" : "+r" (__X)); \ 115 __X; }) 116 117#ifdef __OPTIMIZE__ 118 119#define __byte_swap_long_const(x) \ 120 (((x >> 56) | \ 121 ((x >> 40) & 0xff00) | \ 122 ((x >> 24) & 0xff0000) | \ 123 ((x >> 8) & 0xff000000) | \ 124 ((x << 8) & (0xfful << 32)) | \ 125 ((x << 24) & (0xfful << 40)) | \ 126 ((x << 40) & (0xfful << 48)) | \ 127 ((x << 56)))) 128 129#define __byte_swap_long(x) (__builtin_constant_p(x) ? \ 130 __byte_swap_long_const(x) : __byte_swap_long_var(x)) 131 132#else /* __OPTIMIZE__ */ 133 134#define __byte_swap_long(x) __byte_swap_long_var(x) 135 136#endif /* __OPTIMIZE__ */ 137 138#define __byte_swap_word_var(x) \ 139__extension__ ({ register __uint16_t __X = (x); \ 140 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \ 141 __X; }) 142 143#ifdef __OPTIMIZE__ 144 145#define __byte_swap_word_const(x) \ 146 ((((x) & 0xff00) >> 8) | \ 147 (((x) & 0x00ff) << 8)) 148 149#define __byte_swap_word(x) (__builtin_constant_p(x) ? \ 150 __byte_swap_word_const(x) : __byte_swap_word_var(x)) 151 152#else /* __OPTIMIZE__ */ 153 154#define __byte_swap_word(x) __byte_swap_word_var(x) 155 156#endif /* __OPTIMIZE__ */ 157 158static __inline __uint64_t 159__bswap64(__uint64_t _x) 160{ 161 162 return (__byte_swap_long(_x)); 163} 164 165static __inline __uint32_t 166__bswap32(__uint32_t _x) 167{ 168 169 return (__byte_swap_int(_x)); 170} 171 172static __inline __uint16_t 173__bswap16(__uint16_t _x) 174{ 175 176 return (__byte_swap_word(_x)); 177} 178 179#define __htonl(x) __bswap32(x) 180#define __htons(x) __bswap16(x) 181#define __ntohl(x) __bswap32(x) 182#define __ntohs(x) __bswap16(x) 183 184#else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */ 185 186/* 187 * No optimizations are available for this compiler. Fall back to 188 * non-optimized functions by defining the constant usually used to prevent 189 * redefinition. 190 */ 191#define _BYTEORDER_FUNC_DEFINED 192 193#endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */ 194 195#ifdef __cplusplus 196} 197#endif 198 199#endif /* !_MACHINE_ENDIAN_H_ */ 200