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. 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: src/sys/amd64/include/endian.h,v 1.5 2003/09/22 22:37:49 peter Exp $ 31 */ 32 33 #ifndef _CPU_ENDIAN_H_ 34 #define _CPU_ENDIAN_H_ 35 36 #include <sys/cdefs.h> 37 #include <machine/stdint.h> 38 39 /* 40 * Definitions for byte order, according to byte significance from low 41 * address to high. 42 */ 43 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 44 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 45 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 46 47 #define _BYTE_ORDER _LITTLE_ENDIAN 48 49 /* 50 * Deprecated variants that don't have enough underscores to be useful in more 51 * strict namespaces. 52 */ 53 #if __BSD_VISIBLE 54 #define LITTLE_ENDIAN _LITTLE_ENDIAN 55 #define BIG_ENDIAN _BIG_ENDIAN 56 #define PDP_ENDIAN _PDP_ENDIAN 57 #define BYTE_ORDER _BYTE_ORDER 58 #endif 59 60 #ifdef __GNUC__ 61 62 #define __word_swap_int_var(x) \ 63 __extension__ ({ __uint32_t __X = (x); \ 64 __asm ("rorl $16, %0" : "+r" (__X)); \ 65 __X; }) 66 67 #ifdef __OPTIMIZE__ 68 69 #define __word_swap_int_const(x) \ 70 ((((x) & 0xffff0000) >> 16) | \ 71 (((x) & 0x0000ffff) << 16)) 72 #define __word_swap_int(x) (__builtin_constant_p(x) ? \ 73 __word_swap_int_const(x) : __word_swap_int_var(x)) 74 75 #else /* __OPTIMIZE__ */ 76 77 #define __word_swap_int(x) __word_swap_int_var(x) 78 79 #endif /* __OPTIMIZE__ */ 80 81 #define __byte_swap_int_var(x) \ 82 __extension__ ({ __uint32_t __X = (x); \ 83 __asm ("bswap %0" : "+r" (__X)); \ 84 __X; }) 85 86 #ifdef __OPTIMIZE__ 87 88 #define __byte_swap_int_const(x) \ 89 ((((x) & 0xff000000) >> 24) | \ 90 (((x) & 0x00ff0000) >> 8) | \ 91 (((x) & 0x0000ff00) << 8) | \ 92 (((x) & 0x000000ff) << 24)) 93 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \ 94 __byte_swap_int_const(x) : __byte_swap_int_var(x)) 95 96 #else /* __OPTIMIZE__ */ 97 98 #define __byte_swap_int(x) __byte_swap_int_var(x) 99 100 #endif /* __OPTIMIZE__ */ 101 102 #define __byte_swap_long_var(x) \ 103 __extension__ ({ __uint64_t __X = (x); \ 104 __asm ("bswap %0" : "+r" (__X)); \ 105 __X; }) 106 107 #define __byte_swap_long_const(x) \ 108 (((x >> 56) | \ 109 ((x >> 40) & 0xff00) | \ 110 ((x >> 24) & 0xff0000) | \ 111 ((x >> 8) & 0xff000000) | \ 112 ((x << 8) & ((__uint64_t)0xff << 32)) | \ 113 ((x << 24) & ((__uint64_t)0xff << 40)) | \ 114 ((x << 40) & ((__uint64_t)0xff << 48)) | \ 115 ((x << 56)))) 116 117 #ifdef __i386__ 118 119 #define __byte_swap_long(x) __byte_swap_long_const(x) 120 121 #else 122 123 #ifdef __OPTIMIZE__ 124 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \ 125 __byte_swap_long_const(x) : __byte_swap_long_var(x)) 126 #else /* __OPTIMIZE__ */ 127 #define __byte_swap_long(x) __byte_swap_long_var(x) 128 #endif /* __OPTIMIZE__ */ 129 130 #endif /* __i386__ */ 131 132 #define __byte_swap_word_var(x) \ 133 __extension__ ({ __uint16_t __X = (x); \ 134 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \ 135 __X; }) 136 137 #ifdef __OPTIMIZE__ 138 139 #define __byte_swap_word_const(x) \ 140 ((((x) & 0xff00) >> 8) | \ 141 (((x) & 0x00ff) << 8)) 142 143 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \ 144 __byte_swap_word_const(x) : __byte_swap_word_var(x)) 145 146 #else /* __OPTIMIZE__ */ 147 148 #define __byte_swap_word(x) __byte_swap_word_var(x) 149 150 #endif /* __OPTIMIZE__ */ 151 152 static __inline __always_inline __uint64_t 153 __bswap64(__uint64_t _x) 154 { 155 #if __GNUC_PREREQ__(4, 8) && defined(__cplusplus) 156 return (__builtin_bswap64(_x)); 157 #else 158 return (__byte_swap_long(_x)); 159 #endif 160 } 161 162 static __inline __always_inline __uint32_t 163 __bswap32(__uint32_t _x) 164 { 165 #if __GNUC_PREREQ__(4, 8) && defined(__cplusplus) 166 return (__builtin_bswap32(_x)); 167 #else 168 return (__byte_swap_int(_x)); 169 #endif 170 } 171 172 static __inline __always_inline __uint16_t 173 __bswap16(__uint16_t _x) 174 { 175 #if __GNUC_PREREQ__(4, 8) && defined(__cplusplus) 176 return (__builtin_bswap16(_x)); 177 #else 178 return (__byte_swap_word(_x)); 179 #endif 180 } 181 182 #define __htonl(x) __bswap32(x) 183 #define __htons(x) __bswap16(x) 184 #define __ntohl(x) __bswap32(x) 185 #define __ntohs(x) __bswap16(x) 186 187 #else /* !__GNUC__ */ 188 189 /* 190 * No optimizations are available for this compiler. Fall back to 191 * non-optimized functions by defining the constant usually used to prevent 192 * redefinition. 193 */ 194 #define _BYTEORDER_FUNC_DEFINED 195 196 #endif /* __GNUC__ */ 197 198 /* 199 * Userland compatibility double underscore variants to help with DPorts 200 * (injected through <sys/types.h>). 201 */ 202 #ifndef _KERNEL 203 #define __LITTLE_ENDIAN _LITTLE_ENDIAN 204 #define __BIG_ENDIAN _BIG_ENDIAN 205 #define __PDP_ENDIAN _PDP_ENDIAN 206 #define __BYTE_ORDER _BYTE_ORDER 207 #endif 208 209 #endif /* !_CPU_ENDIAN_H_ */ 210