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(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 71 72 #define __byte_swap_int_var(x) \ 73 __extension__ ({ register __uint32_t __X = (x); \ 74 __asm ("bswap %0" : "+r" (__X)); \ 75 __X; }) 76 77 #ifdef __OPTIMIZE__ 78 79 #define __byte_swap_int_const(x) \ 80 ((((x) & 0xff000000) >> 24) | \ 81 (((x) & 0x00ff0000) >> 8) | \ 82 (((x) & 0x0000ff00) << 8) | \ 83 (((x) & 0x000000ff) << 24)) 84 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \ 85 __byte_swap_int_const(x) : __byte_swap_int_var(x)) 86 87 #else /* __OPTIMIZE__ */ 88 89 #define __byte_swap_int(x) __byte_swap_int_var(x) 90 91 #endif /* __OPTIMIZE__ */ 92 93 static __inline __uint64_t 94 __bswap64(__uint64_t _x) 95 { 96 97 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 98 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 99 ((_x << 24) & ((__uint64_t)0xff << 40)) | 100 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 101 } 102 103 static __inline __uint32_t 104 __bswap32(__uint32_t _x) 105 { 106 107 return (__byte_swap_int(_x)); 108 } 109 110 static __inline __uint16_t 111 __bswap16(__uint16_t _x) 112 { 113 return (_x << 8 | _x >> 8); 114 } 115 116 #define __htonl(x) __bswap32(x) 117 #define __htons(x) __bswap16(x) 118 #define __ntohl(x) __bswap32(x) 119 #define __ntohs(x) __bswap16(x) 120 121 #else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */ 122 123 /* 124 * No optimizations are available for this compiler. Fall back to 125 * non-optimized functions by defining the constant usually used to prevent 126 * redefinition. 127 */ 128 #define _BYTEORDER_FUNC_DEFINED 129 130 #endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */ 131 132 #ifdef __cplusplus 133 } 134 #endif 135 136 #endif /* !_MACHINE_ENDIAN_H_ */ 137