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/mips/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: stable/8/sys/mips/include/endian.h 215938 2010-11-27 12:26:40Z jchandra $
   31  */
   32 
   33 #ifndef _MACHINE_ENDIAN_H_
   34 #define _MACHINE_ENDIAN_H_
   35 
   36 #include <sys/cdefs.h>
   37 #ifndef __ASSEMBLER__
   38 #include <sys/_types.h>
   39 #endif
   40 
   41 #ifdef __cplusplus
   42 extern "C" {
   43 #endif
   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 #ifdef __MIPSEB__
   54 #define _BYTE_ORDER     _BIG_ENDIAN
   55 #else
   56 #define _BYTE_ORDER     _LITTLE_ENDIAN
   57 #endif /* __MIBSEB__ */
   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 #ifndef __ASSEMBLER__
   71 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
   72 #define __is_constant(x)        __builtin_constant_p(x)
   73 #else
   74 #define __is_constant(x)        0
   75 #endif
   76 
   77 #define __bswap16_const(x)      (((x) >> 8) | (((x) << 8) & 0xff00))
   78 #define __bswap32_const(x)      (((x) >> 24) | (((x) >> 8) & 0xff00) |  \
   79         (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000))
   80 #define __bswap64_const(x)      (((x) >> 56) | (((x) >> 40) & 0xff00) | \
   81         (((x) >> 24) & 0xff0000) | (((x) >> 8) & 0xff000000) |          \
   82         (((x) << 8) & ((__uint64_t)0xff << 32)) |                       \
   83         (((x) << 24) & ((__uint64_t)0xff << 40)) |                      \
   84         (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56)))
   85 
   86 static __inline __uint16_t
   87 __bswap16_var(__uint16_t _x)
   88 {
   89 
   90         return ((_x >> 8) | ((_x << 8) & 0xff00));
   91 }
   92 
   93 static __inline __uint32_t
   94 __bswap32_var(__uint32_t _x)
   95 {
   96 
   97         return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
   98             ((_x << 24) & 0xff000000));
   99 }
  100 
  101 static __inline __uint64_t
  102 __bswap64_var(__uint64_t _x)
  103 {
  104 
  105         return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
  106             ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
  107             ((_x << 24) & ((__uint64_t)0xff << 40)) |
  108             ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
  109 }
  110 
  111 #define __bswap16(x)    ((__uint16_t)(__is_constant((x)) ?              \
  112         __bswap16_const((__uint16_t)(x)) :  __bswap16_var((__uint16_t)(x))))
  113 #define __bswap32(x)    ((__uint32_t)(__is_constant((x)) ?              \
  114         __bswap32_const((__uint32_t)(x)) :  __bswap32_var((__uint32_t)(x))))
  115 #define __bswap64(x)    ((__uint64_t)(__is_constant((x)) ?              \
  116         __bswap64_const((__uint64_t)(x)) :  __bswap64_var((__uint64_t)(x))))
  117 
  118 #ifdef __MIPSEB__
  119 #define __htonl(x)      ((__uint32_t)(x))
  120 #define __htons(x)      ((__uint16_t)(x))
  121 #define __ntohl(x)      ((__uint32_t)(x))
  122 #define __ntohs(x)      ((__uint16_t)(x))       
  123 /*
  124  * Define the order of 32-bit words in 64-bit words.
  125  */
  126 /*
  127  * XXXMIPS: Additional parentheses to make gcc more happy.
  128  */
  129 #define _QUAD_HIGHWORD 0
  130 #define _QUAD_LOWWORD 1
  131 #else
  132 #define _QUAD_HIGHWORD  1
  133 #define _QUAD_LOWWORD 0
  134 #define __ntohl(x)      (__bswap32((x)))
  135 #define __ntohs(x)      (__bswap16((x)))
  136 #define __htonl(x)      (__bswap32((x)))
  137 #define __htons(x)      (__bswap16((x)))
  138 #endif /* _MIPSEB */
  139 
  140 #endif /* _ASSEMBLER_ */
  141 
  142 #ifdef __cplusplus
  143 }
  144 #endif
  145 
  146 #endif /* !_MACHINE_ENDIAN_H_ */

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