sys/cpu/amd64/include/endian.h

   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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)endian.h    7.8 (Berkeley) 4/3/91
  34  * $FreeBSD: src/sys/amd64/include/endian.h,v 1.5 2003/09/22 22:37:49 peter Exp $
  35  * $DragonFly: src/sys/cpu/amd64/include/endian.h,v 1.1 2007/08/21 19:40:24 corecode Exp $
  36  */
  37
  38 #ifndef _CPU_ENDIAN_H_
  39 #define _CPU_ENDIAN_H_
  40
  41 #ifndef _KERNEL
  42 #include <sys/cdefs.h>
  43 #endif
  44
  45 #include <machine/stdint.h>
  46
  47 /*
  48  * Define the order of 32-bit words in 64-bit words.
  49  */
  50 #define _QUAD_HIGHWORD 1
  51 #define _QUAD_LOWWORD 0
  52
  53 /*
  54  * Definitions for byte order, according to byte significance from low
  55  * address to high.
  56  */
  57 #define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
  58 #define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
  59 #define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
  60
  61 #define _BYTE_ORDER     _LITTLE_ENDIAN
  62
  63 /*
  64  * Deprecated variants that don't have enough underscores to be useful in more
  65  * strict namespaces.
  66  */
  67 #if __BSD_VISIBLE
  68 #define LITTLE_ENDIAN   _LITTLE_ENDIAN
  69 #define BIG_ENDIAN      _BIG_ENDIAN
  70 #define PDP_ENDIAN      _PDP_ENDIAN
  71 #define BYTE_ORDER      _BYTE_ORDER
  72 #endif
  73
  74 #ifdef __GNUC__
  75
  76 #define __word_swap_int_var(x) \
  77 __extension__ ({ register __uint32_t __X = (x); \
  78    __asm ("rorl $16, %0" : "+r" (__X)); \
  79    __X; })
  80
  81 #ifdef __OPTIMIZE__
  82
  83 #define __word_swap_int_const(x) \
  84         ((((x) & 0xffff0000) >> 16) | \
  85          (((x) & 0x0000ffff) << 16))
  86 #define __word_swap_int(x) (__builtin_constant_p(x) ? \
  87         __word_swap_int_const(x) : __word_swap_int_var(x))
  88
  89 #else   /* __OPTIMIZE__ */
  90
  91 #define __word_swap_int(x) __word_swap_int_var(x)
  92
  93 #endif  /* __OPTIMIZE__ */
  94
  95 #define __byte_swap_int_var(x) \
  96 __extension__ ({ register __uint32_t __X = (x); \
  97    __asm ("bswap %0" : "+r" (__X)); \
  98    __X; })
  99
 100 #ifdef __OPTIMIZE__
 101
 102 #define __byte_swap_int_const(x) \
 103         ((((x) & 0xff000000) >> 24) | \
 104          (((x) & 0x00ff0000) >>  8) | \
 105          (((x) & 0x0000ff00) <<  8) | \
 106          (((x) & 0x000000ff) << 24))
 107 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
 108         __byte_swap_int_const(x) : __byte_swap_int_var(x))
 109
 110 #else   /* __OPTIMIZE__ */
 111
 112 #define __byte_swap_int(x) __byte_swap_int_var(x)
 113
 114 #endif  /* __OPTIMIZE__ */
 115
 116 #define __byte_swap_long_var(x) \
 117 __extension__ ({ register __uint64_t __X = (x); \
 118    __asm ("bswap %0" : "+r" (__X)); \
 119    __X; })
 120
 121 #ifdef __OPTIMIZE__
 122
 123 #define __byte_swap_long_const(x) \
 124         (((x >> 56) | \
 125          ((x >> 40) & 0xff00) | \
 126          ((x >> 24) & 0xff0000) | \
 127          ((x >> 8) & 0xff000000) | \
 128          ((x << 8) & (0xfful << 32)) | \
 129          ((x << 24) & (0xfful << 40)) | \
 130          ((x << 40) & (0xfful << 48)) | \
 131          ((x << 56))))
 132
 133 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \
 134         __byte_swap_long_const(x) : __byte_swap_long_var(x))
 135
 136 #else   /* __OPTIMIZE__ */
 137
 138 #define __byte_swap_long(x) __byte_swap_long_var(x)
 139
 140 #endif  /* __OPTIMIZE__ */
 141
 142 #define __byte_swap_word_var(x) \
 143 __extension__ ({ register __uint16_t __X = (x); \
 144    __asm ("xchgb %h0, %b0" : "+Q" (__X)); \
 145    __X; })
 146
 147 #ifdef __OPTIMIZE__
 148
 149 #define __byte_swap_word_const(x) \
 150         ((((x) & 0xff00) >> 8) | \
 151          (((x) & 0x00ff) << 8))
 152
 153 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \
 154         __byte_swap_word_const(x) : __byte_swap_word_var(x))
 155
 156 #else   /* __OPTIMIZE__ */
 157
 158 #define __byte_swap_word(x) __byte_swap_word_var(x)
 159
 160 #endif  /* __OPTIMIZE__ */
 161
 162 static __inline __uint64_t
 163 __bswap64(__uint64_t _x)
 164 {
 165
 166         return (__byte_swap_long(_x));
 167 }
 168
 169 static __inline __uint32_t
 170 __bswap32(__uint32_t _x)
 171 {
 172
 173         return (__byte_swap_int(_x));
 174 }
 175
 176 static __inline __uint16_t
 177 __bswap16(__uint16_t _x)
 178 {
 179
 180         return (__byte_swap_word(_x));
 181 }
 182
 183 #define __htonl(x)      __bswap32(x)
 184 #define __htons(x)      __bswap16(x)
 185 #define __ntohl(x)      __bswap32(x)
 186 #define __ntohs(x)      __bswap16(x)
 187
 188 #else /* !__GNUC__ */
 189
 190 /*
 191  * No optimizations are available for this compiler.  Fall back to
 192  * non-optimized functions by defining the constant usually used to prevent
 193  * redefinition.
 194  */
 195 #define _BYTEORDER_FUNC_DEFINED
 196
 197 #endif /* __GNUC__ */
 198
 199 #endif /* !_CPU_ENDIAN_H_ */