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1 /*- |
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2 * Copyright (c) 1987, 1991 Regents of the University of California. |
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3 * All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 4. Neither the name of the University nor the names of its contributors |
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14 * may be used to endorse or promote products derived from this software |
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15 * without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 * SUCH DAMAGE. |
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28 * |
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29 * @(#)endian.h 7.8 (Berkeley) 4/3/91 |
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30 * $FreeBSD: src/sys/i386/include/endian.h,v 1.41 2005/03/02 21:33:26 joerg Exp $ |
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31 */ |
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32 |
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33 #ifndef _MACHINE_ENDIAN_H_ |
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34 #define _MACHINE_ENDIAN_H_ |
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35 |
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36 #include <sys/cdefs.h> |
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37 #include <sys/_types.h> |
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38 |
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39 #ifdef __cplusplus |
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40 extern "C" { |
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41 #endif |
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42 |
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43 /* |
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44 * Define the order of 32-bit words in 64-bit words. |
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45 */ |
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46 #define _QUAD_HIGHWORD 1 |
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47 #define _QUAD_LOWWORD 0 |
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48 |
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49 /* |
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50 * Definitions for byte order, according to byte significance from low |
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51 * address to high. |
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52 */ |
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53 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ |
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54 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ |
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55 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ |
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56 |
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57 #define _BYTE_ORDER _LITTLE_ENDIAN |
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58 |
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59 /* |
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60 * Deprecated variants that don't have enough underscores to be useful in more |
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61 * strict namespaces. |
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62 */ |
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63 #if __BSD_VISIBLE |
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64 #define LITTLE_ENDIAN _LITTLE_ENDIAN |
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65 #define BIG_ENDIAN _BIG_ENDIAN |
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66 #define PDP_ENDIAN _PDP_ENDIAN |
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67 #define BYTE_ORDER _BYTE_ORDER |
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68 #endif |
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69 |
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70 #ifdef __SYMBIAN32__ |
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71 |
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72 #define _BYTEORDER_FUNC_DEFINED |
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73 |
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74 #else /* __SYMBIAN32__ */ |
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75 |
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76 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P) |
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77 |
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78 #define __word_swap_int_var(x) \ |
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79 __extension__ ({ register __uint32_t __X = (x); \ |
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80 __asm ("rorl $16, %0" : "+r" (__X)); \ |
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81 __X; }) |
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82 |
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83 #ifdef __OPTIMIZE__ |
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84 |
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85 #define __word_swap_int_const(x) \ |
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86 ((((x) & 0xffff0000) >> 16) | \ |
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87 (((x) & 0x0000ffff) << 16)) |
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88 #define __word_swap_int(x) (__builtin_constant_p(x) ? \ |
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89 __word_swap_int_const(x) : __word_swap_int_var(x)) |
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90 |
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91 #else /* __OPTIMIZE__ */ |
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92 |
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93 #define __word_swap_int(x) __word_swap_int_var(x) |
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94 |
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95 #endif /* __OPTIMIZE__ */ |
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96 |
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97 #define __byte_swap_int_var(x) \ |
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98 __extension__ ({ register __uint32_t __X = (x); \ |
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99 __asm ("bswap %0" : "+r" (__X)); \ |
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100 __X; }) |
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101 |
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102 #ifdef __OPTIMIZE__ |
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103 |
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104 #define __byte_swap_int_const(x) \ |
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105 ((((x) & 0xff000000) >> 24) | \ |
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106 (((x) & 0x00ff0000) >> 8) | \ |
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107 (((x) & 0x0000ff00) << 8) | \ |
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108 (((x) & 0x000000ff) << 24)) |
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109 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \ |
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110 __byte_swap_int_const(x) : __byte_swap_int_var(x)) |
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111 |
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112 #else /* __OPTIMIZE__ */ |
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113 |
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114 #define __byte_swap_int(x) __byte_swap_int_var(x) |
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115 |
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116 #endif /* __OPTIMIZE__ */ |
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117 |
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118 #define __byte_swap_word_var(x) \ |
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119 __extension__ ({ register __uint16_t __X = (x); \ |
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120 __asm ("xchgb %h0, %b0" : "+q" (__X)); \ |
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121 __X; }) |
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122 |
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123 #ifdef __OPTIMIZE__ |
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124 |
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125 #define __byte_swap_word_const(x) \ |
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126 ((((x) & 0xff00) >> 8) | \ |
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127 (((x) & 0x00ff) << 8)) |
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128 |
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129 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \ |
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130 __byte_swap_word_const(x) : __byte_swap_word_var(x)) |
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131 |
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132 #else /* __OPTIMIZE__ */ |
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133 |
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134 #define __byte_swap_word(x) __byte_swap_word_var(x) |
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135 |
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136 #endif /* __OPTIMIZE__ */ |
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137 |
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138 static __inline __uint64_t |
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139 __bswap64(__uint64_t _x) |
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140 { |
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141 |
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142 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | |
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143 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | |
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144 ((_x << 24) & ((__uint64_t)0xff << 40)) | |
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145 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); |
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146 } |
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147 |
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148 static __inline __uint32_t |
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149 __bswap32(__uint32_t _x) |
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150 { |
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151 |
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152 return (__byte_swap_int(_x)); |
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153 } |
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154 |
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155 static __inline __uint16_t |
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156 __bswap16(__uint16_t _x) |
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157 { |
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158 |
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159 return (__byte_swap_word(_x)); |
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160 } |
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161 |
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162 #define __htonl(x) __bswap32(x) |
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163 #define __htons(x) __bswap16(x) |
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164 #define __ntohl(x) __bswap32(x) |
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165 #define __ntohs(x) __bswap16(x) |
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166 |
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167 #else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */ |
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168 |
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169 /* |
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170 * No optimizations are available for this compiler. Fall back to |
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171 * non-optimized functions by defining the constant usually used to prevent |
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172 * redefinition. |
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173 */ |
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174 #define _BYTEORDER_FUNC_DEFINED |
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175 |
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176 #endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */ |
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177 #endif /* __SYMBIAN32__ */ |
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178 |
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179 #ifdef __cplusplus |
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180 } |
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181 #endif |
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182 |
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183 #endif /* !_MACHINE_ENDIAN_H_ */ |