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/8.3/sys/i386/include/endian.h 199583 2009-11-20 15:27:52Z jhb $
   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_ */

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