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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)endian.h 7.8 (Berkeley) 4/3/91 34 * $FreeBSD: src/sys/amd64/include/endian.h,v 1.5 2003/09/22 22:37:49 peter Exp $ 35 */ 36 37 #ifndef _CPU_ENDIAN_H_ 38 #define _CPU_ENDIAN_H_ 39 40 #ifndef _KERNEL 41 #include <sys/cdefs.h> 42 #endif 43 44 #include <machine/stdint.h> 45 46 /* 47 * Define the order of 32-bit words in 64-bit words. 48 */ 49 #define _QUAD_HIGHWORD 1 50 #define _QUAD_LOWWORD 0 51 52 /* 53 * Definitions for byte order, according to byte significance from low 54 * address to high. 55 */ 56 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 57 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 58 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 59 60 #define _BYTE_ORDER _LITTLE_ENDIAN 61 62 /* 63 * Deprecated variants that don't have enough underscores to be useful in more 64 * strict namespaces. 65 */ 66 #if __BSD_VISIBLE 67 #define LITTLE_ENDIAN _LITTLE_ENDIAN 68 #define BIG_ENDIAN _BIG_ENDIAN 69 #define PDP_ENDIAN _PDP_ENDIAN 70 #define BYTE_ORDER _BYTE_ORDER 71 #endif 72 73 #ifdef __GNUC__ 74 75 #define __word_swap_int_var(x) \ 76 __extension__ ({ register __uint32_t __X = (x); \ 77 __asm ("rorl $16, %0" : "+r" (__X)); \ 78 __X; }) 79 80 #ifdef __OPTIMIZE__ 81 82 #define __word_swap_int_const(x) \ 83 ((((x) & 0xffff0000) >> 16) | \ 84 (((x) & 0x0000ffff) << 16)) 85 #define __word_swap_int(x) (__builtin_constant_p(x) ? \ 86 __word_swap_int_const(x) : __word_swap_int_var(x)) 87 88 #else /* __OPTIMIZE__ */ 89 90 #define __word_swap_int(x) __word_swap_int_var(x) 91 92 #endif /* __OPTIMIZE__ */ 93 94 #define __byte_swap_int_var(x) \ 95 __extension__ ({ register __uint32_t __X = (x); \ 96 __asm ("bswap %0" : "+r" (__X)); \ 97 __X; }) 98 99 #ifdef __OPTIMIZE__ 100 101 #define __byte_swap_int_const(x) \ 102 ((((x) & 0xff000000) >> 24) | \ 103 (((x) & 0x00ff0000) >> 8) | \ 104 (((x) & 0x0000ff00) << 8) | \ 105 (((x) & 0x000000ff) << 24)) 106 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \ 107 __byte_swap_int_const(x) : __byte_swap_int_var(x)) 108 109 #else /* __OPTIMIZE__ */ 110 111 #define __byte_swap_int(x) __byte_swap_int_var(x) 112 113 #endif /* __OPTIMIZE__ */ 114 115 #define __byte_swap_long_var(x) \ 116 __extension__ ({ register __uint64_t __X = (x); \ 117 __asm ("bswap %0" : "+r" (__X)); \ 118 __X; }) 119 120 #define __byte_swap_long_const(x) \ 121 (((x >> 56) | \ 122 ((x >> 40) & 0xff00) | \ 123 ((x >> 24) & 0xff0000) | \ 124 ((x >> 8) & 0xff000000) | \ 125 ((x << 8) & ((__uint64_t)0xff << 32)) | \ 126 ((x << 24) & ((__uint64_t)0xff << 40)) | \ 127 ((x << 40) & ((__uint64_t)0xff << 48)) | \ 128 ((x << 56)))) 129 130 #ifdef __i386__ 131 132 #define __byte_swap_long(x) __byte_swap_long_const(x) 133 134 #else 135 136 #ifdef __OPTIMIZE__ 137 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \ 138 __byte_swap_long_const(x) : __byte_swap_long_var(x)) 139 #else /* __OPTIMIZE__ */ 140 #define __byte_swap_long(x) __byte_swap_long_var(x) 141 #endif /* __OPTIMIZE__ */ 142 143 #endif /* __i386__ */ 144 145 #define __byte_swap_word_var(x) \ 146 __extension__ ({ register __uint16_t __X = (x); \ 147 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \ 148 __X; }) 149 150 #ifdef __OPTIMIZE__ 151 152 #define __byte_swap_word_const(x) \ 153 ((((x) & 0xff00) >> 8) | \ 154 (((x) & 0x00ff) << 8)) 155 156 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \ 157 __byte_swap_word_const(x) : __byte_swap_word_var(x)) 158 159 #else /* __OPTIMIZE__ */ 160 161 #define __byte_swap_word(x) __byte_swap_word_var(x) 162 163 #endif /* __OPTIMIZE__ */ 164 165 static __inline __uint64_t 166 __bswap64(__uint64_t _x) 167 { 168 169 return (__byte_swap_long(_x)); 170 } 171 172 static __inline __uint32_t 173 __bswap32(__uint32_t _x) 174 { 175 176 return (__byte_swap_int(_x)); 177 } 178 179 static __inline __uint16_t 180 __bswap16(__uint16_t _x) 181 { 182 183 return (__byte_swap_word(_x)); 184 } 185 186 #define __htonl(x) __bswap32(x) 187 #define __htons(x) __bswap16(x) 188 #define __ntohl(x) __bswap32(x) 189 #define __ntohs(x) __bswap16(x) 190 191 #else /* !__GNUC__ */ 192 193 /* 194 * No optimizations are available for this compiler. Fall back to 195 * non-optimized functions by defining the constant usually used to prevent 196 * redefinition. 197 */ 198 #define _BYTEORDER_FUNC_DEFINED 199 200 #endif /* __GNUC__ */ 201 202 #endif /* !_CPU_ENDIAN_H_ */ 203