reactos/drivers/lib/oskittcp/include/freebsd/src/sys/machine/endian.h

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