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 * $FreeBSD$ 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 40 extern "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(__INTEL_COMPILER) 71 #if defined(__cplusplus) 72 #if __INTEL_COMPILER >= 800 73 #define __INTEL_COMPILER_with_FreeBSD_endian 1 74 #endif 75 #else 76 #define __INTEL_COMPILER_with_FreeBSD_endian 1 77 #endif 78 #endif 79 80 #if defined(__GNUC__) || defined(__INTEL_COMPILER_with_FreeBSD_endian) 81 82 #define __word_swap_int_var(x) \ 83 __extension__ ({ register __uint32_t __X = (x); \ 84 __asm ("rorl $16, %0" : "+r" (__X)); \ 85 __X; }) 86 87 #ifdef __OPTIMIZE__ 88 89 #define __word_swap_int_const(x) \ 90 ((((x) & 0xffff0000) >> 16) | \ 91 (((x) & 0x0000ffff) << 16)) 92 #define __word_swap_int(x) (__builtin_constant_p(x) ? \ 93 __word_swap_int_const(x) : __word_swap_int_var(x)) 94 95 #else /* __OPTIMIZE__ */ 96 97 #define __word_swap_int(x) __word_swap_int_var(x) 98 99 #endif /* __OPTIMIZE__ */ 100 101 #define __byte_swap_int_var(x) \ 102 __extension__ ({ register __uint32_t __X = (x); \ 103 __asm ("bswap %0" : "+r" (__X)); \ 104 __X; }) 105 106 #ifdef __OPTIMIZE__ 107 108 #define __byte_swap_int_const(x) \ 109 ((((x) & 0xff000000) >> 24) | \ 110 (((x) & 0x00ff0000) >> 8) | \ 111 (((x) & 0x0000ff00) << 8) | \ 112 (((x) & 0x000000ff) << 24)) 113 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \ 114 __byte_swap_int_const(x) : __byte_swap_int_var(x)) 115 116 #else /* __OPTIMIZE__ */ 117 118 #define __byte_swap_int(x) __byte_swap_int_var(x) 119 120 #endif /* __OPTIMIZE__ */ 121 122 #define __byte_swap_word_var(x) \ 123 __extension__ ({ register __uint16_t __X = (x); \ 124 __asm ("xchgb %h0, %b0" : "+q" (__X)); \ 125 __X; }) 126 127 #ifdef __OPTIMIZE__ 128 129 #define __byte_swap_word_const(x) \ 130 ((((x) & 0xff00) >> 8) | \ 131 (((x) & 0x00ff) << 8)) 132 133 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \ 134 __byte_swap_word_const(x) : __byte_swap_word_var(x)) 135 136 #else /* __OPTIMIZE__ */ 137 138 #define __byte_swap_word(x) __byte_swap_word_var(x) 139 140 #endif /* __OPTIMIZE__ */ 141 142 static __inline __uint64_t 143 __bswap64(__uint64_t _x) 144 { 145 146 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 147 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 148 ((_x << 24) & ((__uint64_t)0xff << 40)) | 149 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 150 } 151 152 static __inline __uint32_t 153 __bswap32(__uint32_t _x) 154 { 155 156 return (__byte_swap_int(_x)); 157 } 158 159 static __inline __uint16_t 160 __bswap16(__uint16_t _x) 161 { 162 163 return (__byte_swap_word(_x)); 164 } 165 166 #define __htonl(x) __bswap32(x) 167 #define __htons(x) __bswap16(x) 168 #define __ntohl(x) __bswap32(x) 169 #define __ntohs(x) __bswap16(x) 170 171 #else /* !(__GNUC__ || __INTEL_COMPILER_with_FreeBSD_endian) */ 172 173 /* 174 * No optimizations are available for this compiler. Fall back to 175 * non-optimized functions by defining the constant usually used to prevent 176 * redefinition. 177 */ 178 #define _BYTEORDER_FUNC_DEFINED 179 180 #endif /* __GNUC__ || __INTEL_COMPILER_with_FreeBSD_endian */ 181 182 #ifdef __cplusplus 183 } 184 #endif 185 186 #endif /* !_MACHINE_ENDIAN_H_ */ 187