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

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    1 /*-
    2  * Copyright (c) 2001 David E. O'Brien
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. Neither the name of the University nor the names of its contributors
   13  *    may be used to endorse or promote products derived from this software
   14  *    without specific prior written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      @(#)endian.h    8.1 (Berkeley) 6/10/93
   29  * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
   30  * $FreeBSD: releng/9.0/sys/arm/include/endian.h 182086 2008-08-23 23:35:08Z imp $
   31  */
   32 
   33 #ifndef _ENDIAN_H_
   34 #define _ENDIAN_H_
   35 
   36 #include <sys/_types.h>
   37 
   38 /*
   39  * Definitions for byte order, according to byte significance from low
   40  * address to high.
   41  */
   42 #define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
   43 #define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
   44 #define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
   45 
   46 #ifdef __ARMEB__
   47 #define _BYTE_ORDER     _BIG_ENDIAN
   48 #else
   49 #define _BYTE_ORDER     _LITTLE_ENDIAN
   50 #endif /* __ARMEB__ */
   51 
   52 #if __BSD_VISIBLE
   53 #define LITTLE_ENDIAN   _LITTLE_ENDIAN
   54 #define BIG_ENDIAN      _BIG_ENDIAN
   55 #define PDP_ENDIAN      _PDP_ENDIAN
   56 #define BYTE_ORDER      _BYTE_ORDER
   57 #endif
   58 
   59 #ifdef __ARMEB__
   60 #define _QUAD_HIGHWORD 0
   61 #define _QUAD_LOWWORD 1
   62 #define __ntohl(x)      ((__uint32_t)(x))
   63 #define __ntohs(x)      ((__uint16_t)(x))
   64 #define __htonl(x)      ((__uint32_t)(x))
   65 #define __htons(x)      ((__uint16_t)(x))
   66 #else
   67 #define _QUAD_HIGHWORD  1
   68 #define _QUAD_LOWWORD 0
   69 #define __ntohl(x)        (__bswap32(x))
   70 #define __ntohs(x)        (__bswap16(x))
   71 #define __htonl(x)        (__bswap32(x))
   72 #define __htons(x)        (__bswap16(x))
   73 #endif /* __ARMEB__ */
   74 
   75 static __inline __uint64_t
   76 __bswap64(__uint64_t _x)
   77 {
   78 
   79         return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
   80             ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
   81             ((_x << 24) & ((__uint64_t)0xff << 40)) | 
   82             ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
   83 }
   84 
   85 static __inline __uint32_t
   86 __bswap32_var(__uint32_t v)
   87 {
   88         __uint32_t t1;
   89 
   90         __asm __volatile("eor %1, %0, %0, ror #16\n"
   91                         "bic %1, %1, #0x00ff0000\n"
   92                         "mov %0, %0, ror #8\n"
   93                         "eor %0, %0, %1, lsr #8\n"
   94                          : "+r" (v), "=r" (t1));
   95         
   96         return (v);
   97 }
   98 
   99 static __inline __uint16_t
  100 __bswap16_var(__uint16_t v)
  101 {
  102         __uint32_t ret = v & 0xffff;
  103 
  104         __asm __volatile(
  105             "mov    %0, %0, ror #8\n"
  106             "orr    %0, %0, %0, lsr #16\n"
  107             "bic    %0, %0, %0, lsl #16"
  108             : "+r" (ret));
  109         
  110         return ((__uint16_t)ret);
  111 }               
  112 
  113 #ifdef __OPTIMIZE__
  114 
  115 #define __bswap32_constant(x)   \
  116     ((((x) & 0xff000000U) >> 24) |      \
  117      (((x) & 0x00ff0000U) >>  8) |      \
  118      (((x) & 0x0000ff00U) <<  8) |      \
  119      (((x) & 0x000000ffU) << 24))
  120 
  121 #define __bswap16_constant(x)   \
  122     ((((x) & 0xff00) >> 8) |            \
  123      (((x) & 0x00ff) << 8))
  124 
  125 #define __bswap16(x)    \
  126     ((__uint16_t)(__builtin_constant_p(x) ?     \
  127      __bswap16_constant(x) :                    \
  128      __bswap16_var(x)))
  129 
  130 #define __bswap32(x)    \
  131     ((__uint32_t)(__builtin_constant_p(x) ?     \
  132      __bswap32_constant(x) :                    \
  133      __bswap32_var(x)))
  134 
  135 #else
  136 #define __bswap16(x)    __bswap16_var(x)
  137 #define __bswap32(x)    __bswap32_var(x)
  138 
  139 #endif /* __OPTIMIZE__ */
  140 #endif /* !_ENDIAN_H_ */

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