The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sun4v/include/endian.h

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    1 /*-
    2  * Copyright (c) 1987, 1991, 1993
    3  *      The Regents of the University of California.  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    8.1 (Berkeley) 6/10/93
   30  * $FreeBSD$
   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 /*
   40  * Define the order of 32-bit words in 64-bit words.
   41  */
   42 #define _QUAD_HIGHWORD 0
   43 #define _QUAD_LOWWORD 1
   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     _BIG_ENDIAN
   54 
   55 /*
   56  * Deprecated variants that don't have enough underscores to be useful in more
   57  * strict namespaces.
   58  */
   59 #if __BSD_VISIBLE
   60 #define LITTLE_ENDIAN   _LITTLE_ENDIAN
   61 #define BIG_ENDIAN      _BIG_ENDIAN
   62 #define PDP_ENDIAN      _PDP_ENDIAN
   63 #define BYTE_ORDER      _BYTE_ORDER
   64 #endif
   65 
   66 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
   67 #define __is_constant(x)        __builtin_constant_p(x)
   68 #else
   69 #define __is_constant(x)        0
   70 #endif
   71 
   72 #define __bswap16_const(x)      ((((x) >> 8) & 0xff) |                  \
   73         (((x) << 8) & 0xff00))
   74 #define __bswap32_const(x)      ((((x) >> 24) & 0xff) |                 \
   75         (((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) |               \
   76         (((x) << 24) & 0xff000000))
   77 #define __bswap64_const(x)      ((((x) >> 56) & 0xff) |                 \
   78         (((x) >> 40) & 0xff00) | (((x) >> 24) & 0xff0000) |             \
   79         (((x) >> 8) & 0xff000000) |                                     \
   80         (((x) << 8) & ((__uint64_t)0xff << 32)) |                       \
   81         (((x) << 24) & ((__uint64_t)0xff << 40)) |                      \
   82         (((x) << 40) & ((__uint64_t)0xff << 48)) |                      \
   83         (((x) << 56) & ((__uint64_t)0xff << 56)))
   84 
   85 static __inline __uint16_t
   86 __bswap16_var(__uint16_t _x)
   87 {
   88 
   89         return ((_x >> 8) | ((_x << 8) & 0xff00));
   90 }
   91 
   92 static __inline __uint32_t
   93 __bswap32_var(__uint32_t _x)
   94 {
   95 
   96         return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
   97             ((_x << 24) & 0xff000000));
   98 }
   99 
  100 static __inline __uint64_t
  101 __bswap64_var(__uint64_t _x)
  102 {
  103 
  104         return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
  105             ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
  106             ((_x << 24) & ((__uint64_t)0xff << 40)) |
  107             ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
  108 }
  109 
  110 #define __bswap16(x)    (__is_constant(x) ? __bswap16_const(x) : \
  111         __bswap16_var(x))
  112 #define __bswap32(x)    (__is_constant(x) ? __bswap32_const(x) : \
  113         __bswap32_var(x))
  114 #define __bswap64(x)    (__is_constant(x) ? __bswap64_const(x) : \
  115         __bswap64_var(x))
  116 
  117 #define __htonl(x)      ((__uint32_t)(x))
  118 #define __htons(x)      ((__uint16_t)(x))
  119 #define __ntohl(x)      ((__uint32_t)(x))
  120 #define __ntohs(x)      ((__uint16_t)(x))
  121 
  122 #endif /* !_MACHINE_ENDIAN_H_ */

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