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/i386/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: releng/5.3/sys/i386/include/endian.h 128019 2004-04-07 20:46:16Z imp $
   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 #ifdef __cplusplus
   40 extern "C" {
   41 #endif
   42 
   43 /*
   44  * Define the order of 32-bit words in 64-bit words.
   45  */
   46 #define _QUAD_HIGHWORD 1
   47 #define _QUAD_LOWWORD 0
   48 
   49 /*
   50  * Definitions for byte order, according to byte significance from low
   51  * address to high.
   52  */
   53 #define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
   54 #define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
   55 #define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
   56 
   57 #define _BYTE_ORDER     _LITTLE_ENDIAN
   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 #if defined(__INTEL_COMPILER)
   71 #if defined(__cplusplus)
   72 #if __INTEL_COMPILER >= 800
   73 #define __INTEL_COMPILER_with_FreeBSD_endian 1
   74 #endif
   75 #else
   76 #define __INTEL_COMPILER_with_FreeBSD_endian 1
   77 #endif
   78 #endif
   79 
   80 #if defined(__GNUC__) || defined(__INTEL_COMPILER_with_FreeBSD_endian)
   81 
   82 #define __word_swap_int_var(x) \
   83 __extension__ ({ register __uint32_t __X = (x); \
   84    __asm ("rorl $16, %0" : "+r" (__X)); \
   85    __X; })
   86 
   87 #ifdef __OPTIMIZE__
   88 
   89 #define __word_swap_int_const(x) \
   90         ((((x) & 0xffff0000) >> 16) | \
   91          (((x) & 0x0000ffff) << 16))
   92 #define __word_swap_int(x) (__builtin_constant_p(x) ? \
   93         __word_swap_int_const(x) : __word_swap_int_var(x))
   94 
   95 #else   /* __OPTIMIZE__ */
   96 
   97 #define __word_swap_int(x) __word_swap_int_var(x)
   98 
   99 #endif  /* __OPTIMIZE__ */
  100 
  101 #if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
  102 
  103 #define __byte_swap_int_var(x) \
  104 __extension__ ({ register __uint32_t __X = (x); \
  105    __asm ("bswap %0" : "+r" (__X)); \
  106    __X; })
  107 #else
  108 
  109 #define __byte_swap_int_var(x) \
  110 __extension__ ({ register __uint32_t __X = (x); \
  111    __asm ("xchgb %h0, %b0\n\trorl $16, %0\n\txchgb %h0, %b0" \
  112        : "+q" (__X)); \
  113    __X; })
  114 #endif
  115 
  116 #ifdef __OPTIMIZE__
  117 
  118 #define __byte_swap_int_const(x) \
  119         ((((x) & 0xff000000) >> 24) | \
  120          (((x) & 0x00ff0000) >>  8) | \
  121          (((x) & 0x0000ff00) <<  8) | \
  122          (((x) & 0x000000ff) << 24))
  123 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
  124         __byte_swap_int_const(x) : __byte_swap_int_var(x))
  125 
  126 #else   /* __OPTIMIZE__ */
  127 
  128 #define __byte_swap_int(x) __byte_swap_int_var(x)
  129 
  130 #endif  /* __OPTIMIZE__ */
  131 
  132 #define __byte_swap_word_var(x) \
  133 __extension__ ({ register __uint16_t __X = (x); \
  134    __asm ("xchgb %h0, %b0" : "+q" (__X)); \
  135    __X; })
  136 
  137 #ifdef __OPTIMIZE__
  138 
  139 #define __byte_swap_word_const(x) \
  140         ((((x) & 0xff00) >> 8) | \
  141          (((x) & 0x00ff) << 8))
  142 
  143 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \
  144         __byte_swap_word_const(x) : __byte_swap_word_var(x))
  145 
  146 #else   /* __OPTIMIZE__ */
  147 
  148 #define __byte_swap_word(x) __byte_swap_word_var(x)
  149 
  150 #endif  /* __OPTIMIZE__ */
  151 
  152 static __inline __uint64_t
  153 __bswap64(__uint64_t _x)
  154 {
  155 
  156         return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
  157             ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
  158             ((_x << 24) & ((__uint64_t)0xff << 40)) |
  159             ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
  160 }
  161 
  162 static __inline __uint32_t
  163 __bswap32(__uint32_t _x)
  164 {
  165 
  166         return (__byte_swap_int(_x));
  167 }
  168 
  169 static __inline __uint16_t
  170 __bswap16(__uint16_t _x)
  171 {
  172 
  173         return (__byte_swap_word(_x));
  174 }
  175 
  176 #define __htonl(x)      __bswap32(x)
  177 #define __htons(x)      __bswap16(x)
  178 #define __ntohl(x)      __bswap32(x)
  179 #define __ntohs(x)      __bswap16(x)
  180 
  181 #else /* !(__GNUC__ || __INTEL_COMPILER_with_FreeBSD_endian) */
  182 
  183 /*
  184  * No optimizations are available for this compiler.  Fall back to
  185  * non-optimized functions by defining the constant usually used to prevent
  186  * redefinition.
  187  */
  188 #define _BYTEORDER_FUNC_DEFINED
  189 
  190 #endif /* __GNUC__ || __INTEL_COMPILER_with_FreeBSD_endian */
  191 
  192 #ifdef __cplusplus
  193 }
  194 #endif
  195 
  196 #endif /* !_MACHINE_ENDIAN_H_ */

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