The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/endian.h

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    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: releng/9.1/sys/i386/include/endian.h 233349 2012-03-23 10:55:19Z dim $
   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 __bswap64_const(_x)                     \
   73         (((_x) >> 56) |                         \
   74         (((_x) >> 40) & (0xffULL << 8)) |       \
   75         (((_x) >> 24) & (0xffULL << 16)) |      \
   76         (((_x) >> 8) & (0xffULL << 24)) |       \
   77         (((_x) << 8) & (0xffULL << 32)) |       \
   78         (((_x) << 24) & (0xffULL << 40)) |      \
   79         (((_x) << 40) & (0xffULL << 48)) |      \
   80         ((_x) << 56))
   81 
   82 #define __bswap32_const(_x)                     \
   83         (((_x) >> 24) |                         \
   84         (((_x) & (0xff << 16)) >> 8) |          \
   85         (((_x) & (0xff << 8)) << 8) |           \
   86         ((_x) << 24))
   87 
   88 #define __bswap16_const(_x)     (__uint16_t)((_x) << 8 | (_x) >> 8)
   89 
   90 static __inline __uint64_t
   91 __bswap64_var(__uint64_t __x)
   92 {
   93 
   94         return __bswap64_const(__x);
   95 }
   96 
   97 
   98 static __inline __uint32_t
   99 __bswap32_var(__uint32_t _x)
  100 {
  101 
  102         __asm ("bswap %0" : "+r" (_x));
  103         return (_x);
  104 }
  105 
  106 static __inline __uint16_t
  107 __bswap16_var(__uint16_t _x)
  108 {
  109 
  110         return (__bswap16_const(_x));
  111 }
  112 
  113 #define __bswap64(_x)                                   \
  114         (__builtin_constant_p(_x) ?                     \
  115             __bswap64_const((__uint64_t)(_x)) : __bswap64_var(_x))
  116 
  117 #define __bswap32(_x)                                   \
  118         (__builtin_constant_p(_x) ?                     \
  119             __bswap32_const((__uint32_t)(_x)) : __bswap32_var(_x))
  120 
  121 #define __bswap16(_x)                                   \
  122         ((__uint16_t)(__builtin_constant_p(_x) ?        \
  123             __bswap16_const((__uint16_t)(_x)) : __bswap16_var(_x)))
  124 
  125 #define __htonl(x)      __bswap32(x)
  126 #define __htons(x)      __bswap16(x)
  127 #define __ntohl(x)      __bswap32(x)
  128 #define __ntohs(x)      __bswap16(x)
  129 
  130 #else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */
  131 
  132 /*
  133  * No optimizations are available for this compiler.  Fall back to
  134  * non-optimized functions by defining the constant usually used to prevent
  135  * redefinition.
  136  */
  137 #define _BYTEORDER_FUNC_DEFINED
  138 
  139 #endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */
  140 
  141 #ifdef __cplusplus
  142 }
  143 #endif
  144 
  145 #endif /* !_MACHINE_ENDIAN_H_ */

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