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  *      from: @(#)endian.h      7.8 (Berkeley) 4/3/91
   34  * $FreeBSD: src/sys/i386/include/endian.h,v 1.7.2.3 1999/09/05 08:11:47 peter Exp $
   35  */
   36 
   37 #ifndef _MACHINE_ENDIAN_H_
   38 #define _MACHINE_ENDIAN_H_
   39 
   40 /*
   41  * Define the order of 32-bit words in 64-bit words.
   42  */
   43 #define _QUAD_HIGHWORD 1
   44 #define _QUAD_LOWWORD 0
   45 
   46 #ifndef _POSIX_SOURCE
   47 
   48 /*
   49  * Definitions for byte order, according to byte significance from low
   50  * address to high.
   51  */
   52 #define LITTLE_ENDIAN   1234    /* LSB first: i386, vax */
   53 #define BIG_ENDIAN      4321    /* MSB first: 68000, ibm, net */
   54 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long */
   55 
   56 #define BYTE_ORDER      LITTLE_ENDIAN
   57 
   58 #ifndef KERNEL
   59 #include <sys/cdefs.h>
   60 
   61 __BEGIN_DECLS
   62 unsigned long   htonl __P((unsigned long));
   63 unsigned short  htons __P((unsigned short));
   64 unsigned long   ntohl __P((unsigned long));
   65 unsigned short  ntohs __P((unsigned short));
   66 __END_DECLS
   67 
   68 #endif /* !KERNEL */
   69 
   70 #define __word_swap_long(x) \
   71 ({ register u_long __X = (x); \
   72    __asm ("rorl $16, %1" \
   73         : "=r" (__X) \
   74         : "" (__X)); \
   75    __X; })
   76 #if __GNUC__ >= 2
   77 #define __byte_swap_long(x) \
   78 __extension__ ({ register u_long __X = (x); \
   79    __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \
   80         : "=q" (__X) \
   81         : "" (__X)); \
   82    __X; })
   83 #define __byte_swap_word(x) \
   84 __extension__ ({ register u_short __X = (x); \
   85    __asm ("xchgb %h1, %b1" \
   86         : "=q" (__X) \
   87         : "" (__X)); \
   88    __X; })
   89 #else /* __GNUC__ >= 2 */
   90 #define __byte_swap_long(x) \
   91 ({ register u_long __X = (x); \
   92    __asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \
   93         : "=r" (__X) \
   94         : "" (__X)); \
   95    __X; })
   96 #define __byte_swap_word(x) \
   97 ({ register u_short __X = (x); \
   98    __asm ("rorw $8, %w1" \
   99         : "=r" (__X) \
  100         : "" (__X)); \
  101    __X; })
  102 #endif /* __GNUC__ >= 2 */
  103 
  104 /*
  105  * Macros for network/external number representation conversion.
  106  */
  107 #ifdef __GNUC__
  108 #define ntohl   __byte_swap_long
  109 #define ntohs   __byte_swap_word
  110 #define htonl   __byte_swap_long
  111 #define htons   __byte_swap_word
  112 #endif
  113 
  114 #define NTOHL(x)        ((x) = ntohl((u_long)(x)))
  115 #define NTOHS(x)        ((x) = ntohs((u_short)(x)))
  116 #define HTONL(x)        ((x) = htonl((u_long)(x)))
  117 #define HTONS(x)        ((x) = htons((u_short)(x)))
  118 
  119 #endif /* ! _POSIX_SOURCE */
  120 
  121 #endif /* !_MACHINE_ENDIAN_H_ */

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