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  * 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: releng/5.0/sys/i386/include/endian.h 103814 2002-09-23 04:32:17Z mike $
   35  */
   36 
   37 #ifndef _MACHINE_ENDIAN_H_
   38 #define _MACHINE_ENDIAN_H_
   39 
   40 #include <sys/cdefs.h>
   41 #include <sys/_types.h>
   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 #ifdef __GNUC__
   71 
   72 #define __word_swap_int(x) \
   73 __extension__ ({ register __uint32_t __X = (x); \
   74    __asm ("rorl $16, %0" : "+r" (__X)); \
   75    __X; })
   76 
   77 #if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
   78 
   79 #define __byte_swap_int(x) \
   80 __extension__ ({ register __uint32_t __X = (x); \
   81    __asm ("bswap %0" : "+r" (__X)); \
   82    __X; })
   83 #else
   84 
   85 #define __byte_swap_int(x) \
   86 __extension__ ({ register __uint32_t __X = (x); \
   87    __asm ("xchgb %h0, %b0\n\trorl $16, %0\n\txchgb %h0, %b0" \
   88        : "+q" (__X)); \
   89    __X; })
   90 #endif
   91 
   92 #define __byte_swap_word(x) \
   93 __extension__ ({ register __uint16_t __X = (x); \
   94    __asm ("xchgb %h0, %b0" : "+q" (__X)); \
   95    __X; })
   96 
   97 static __inline __uint64_t
   98 __bswap64(__uint64_t _x)
   99 {
  100         return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
  101             ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
  102             ((_x << 24) & ((__uint64_t)0xff << 40)) |
  103             ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
  104 }
  105 
  106 static __inline __uint32_t
  107 __bswap32(__uint32_t _x)
  108 {
  109 
  110         return (__byte_swap_int(_x));
  111 }
  112 
  113 static __inline __uint16_t
  114 __bswap16(__uint16_t _x)
  115 {
  116 
  117         return (__byte_swap_word(_x));
  118 }
  119 
  120 #define __htonl(x)      __bswap32(x)
  121 #define __htons(x)      __bswap16(x)
  122 #define __ntohl(x)      __bswap32(x)
  123 #define __ntohs(x)      __bswap16(x)
  124 
  125 #else /* !__GNUC__ */
  126 
  127 /*
  128  * No optimizations are available for this compiler.  Fall back to
  129  * non-optimized functions by defining the constant usually used to prevent
  130  * redefinition.
  131  */
  132 #define _BYTEORDER_FUNC_DEFINED
  133 
  134 #endif /* __GNUC__ */
  135 
  136 #endif /* !_MACHINE_ENDIAN_H_ */

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