FreeBSD/Linux Kernel Cross Reference
sys/sparc64/include/endian.h

     /*-
      * Copyright (c) 1987, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)endian.h    8.1 (Berkeley) 6/10/93
     * $FreeBSD: releng/8.2/sys/sparc64/include/endian.h 213973 2010-10-17 13:41:09Z marius $
     */
    
    #ifndef _MACHINE_ENDIAN_H_
    #define _MACHINE_ENDIAN_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    
    /*
     * Define the order of 32-bit words in 64-bit words.
     */
    #define _QUAD_HIGHWORD 0
    #define _QUAD_LOWWORD 1
    
    /*
     * Definitions for byte order, according to byte significance from low
     * address to high.
     */
    #define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
    #define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
    #define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
    
    #define _BYTE_ORDER     _BIG_ENDIAN
    
    /*
     * Deprecated variants that don't have enough underscores to be useful in more
     * strict namespaces.
     */
    #if __BSD_VISIBLE
    #define LITTLE_ENDIAN   _LITTLE_ENDIAN
    #define BIG_ENDIAN      _BIG_ENDIAN
    #define PDP_ENDIAN      _PDP_ENDIAN
    #define BYTE_ORDER      _BYTE_ORDER
    #endif
    
    #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
    #define __is_constant(x)        __builtin_constant_p(x)
    #else
    #define __is_constant(x)        0
    #endif
    
    #define __bswap16_const(x)      ((((__uint16_t)(x) >> 8) & 0xff) |      \
            (((__uint16_t)(x) << 8) & 0xff00))
    #define __bswap32_const(x)      ((((__uint32_t)(x) >> 24) & 0xff) |     \
            (((__uint32_t)(x) >> 8) & 0xff00) |                             \
            (((__uint32_t)(x)<< 8) & 0xff0000) |                            \
            (((__uint32_t)(x) << 24) & 0xff000000))
    #define __bswap64_const(x)      ((((__uint64_t)(x) >> 56) & 0xff) |     \
            (((__uint64_t)(x) >> 40) & 0xff00) |                            \
            (((__uint64_t)(x) >> 24) & 0xff0000) |                          \
            (((__uint64_t)(x) >> 8) & 0xff000000) |                         \
            (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) |           \
            (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) |          \
            (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) |          \
            (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
    
    static __inline __uint16_t
    __bswap16_var(__uint16_t _x)
    {
    
            return ((_x >> 8) | ((_x << 8) & 0xff00));
    }
    
    static __inline __uint32_t
    __bswap32_var(__uint32_t _x)
    {
    
            return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
                ((_x << 24) & 0xff000000));
   }
   
   static __inline __uint64_t
   __bswap64_var(__uint64_t _x)
   {
   
           return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
               ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
               ((_x << 24) & ((__uint64_t)0xff << 40)) |
               ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
   }
   
   #define __bswap16(x)    (__is_constant(x) ? __bswap16_const(x) : \
           __bswap16_var(x))
   #define __bswap32(x)    (__is_constant(x) ? __bswap32_const(x) : \
           __bswap32_var(x))
   #define __bswap64(x)    (__is_constant(x) ? __bswap64_const(x) : \
           __bswap64_var(x))
   
   #define __htonl(x)      ((__uint32_t)(x))
   #define __htons(x)      ((__uint16_t)(x))
   #define __ntohl(x)      ((__uint32_t)(x))
   #define __ntohs(x)      ((__uint16_t)(x))
   
   #endif /* !_MACHINE_ENDIAN_H_ */

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