ceph/src/dpdk/lib/librte_eal/common/include/generic/rte_byteorder.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _RTE_BYTEORDER_H_
  35 #define _RTE_BYTEORDER_H_
  36
  37 /**
  38  * @file
  39  *
  40  * Byte Swap Operations
  41  *
  42  * This file defines a generic API for byte swap operations. Part of
  43  * the implementation is architecture-specific.
  44  */
  45
  46 #include <stdint.h>
  47 #ifdef RTE_EXEC_ENV_BSDAPP
  48 #include <sys/endian.h>
  49 #else
  50 #include <endian.h>
  51 #endif
  52
  53 #include <rte_common.h>
  54
  55 /*
  56  * Compile-time endianness detection
  57  */
  58 #define RTE_BIG_ENDIAN    1
  59 #define RTE_LITTLE_ENDIAN 2
  60 #if defined __BYTE_ORDER__
  61 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  62 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
  63 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  64 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
  65 #endif /* __BYTE_ORDER__ */
  66 #elif defined __BYTE_ORDER
  67 #if __BYTE_ORDER == __BIG_ENDIAN
  68 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
  69 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  70 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
  71 #endif /* __BYTE_ORDER */
  72 #elif defined __BIG_ENDIAN__
  73 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
  74 #elif defined __LITTLE_ENDIAN__
  75 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
  76 #endif
  77
  78 /*
  79  * An internal function to swap bytes in a 16-bit value.
  80  *
  81  * It is used by rte_bswap16() when the value is constant. Do not use
  82  * this function directly; rte_bswap16() is preferred.
  83  */
  84 static inline uint16_t
  85 rte_constant_bswap16(uint16_t x)
  86 {
  87         return (uint16_t)(((x & 0x00ffU) << 8) |
  88                 ((x & 0xff00U) >> 8));
  89 }
  90
  91 /*
  92  * An internal function to swap bytes in a 32-bit value.
  93  *
  94  * It is used by rte_bswap32() when the value is constant. Do not use
  95  * this function directly; rte_bswap32() is preferred.
  96  */
  97 static inline uint32_t
  98 rte_constant_bswap32(uint32_t x)
  99 {
 100         return  ((x & 0x000000ffUL) << 24) |
 101                 ((x & 0x0000ff00UL) << 8) |
 102                 ((x & 0x00ff0000UL) >> 8) |
 103                 ((x & 0xff000000UL) >> 24);
 104 }
 105
 106 /*
 107  * An internal function to swap bytes of a 64-bit value.
 108  *
 109  * It is used by rte_bswap64() when the value is constant. Do not use
 110  * this function directly; rte_bswap64() is preferred.
 111  */
 112 static inline uint64_t
 113 rte_constant_bswap64(uint64_t x)
 114 {
 115         return  ((x & 0x00000000000000ffULL) << 56) |
 116                 ((x & 0x000000000000ff00ULL) << 40) |
 117                 ((x & 0x0000000000ff0000ULL) << 24) |
 118                 ((x & 0x00000000ff000000ULL) <<  8) |
 119                 ((x & 0x000000ff00000000ULL) >>  8) |
 120                 ((x & 0x0000ff0000000000ULL) >> 24) |
 121                 ((x & 0x00ff000000000000ULL) >> 40) |
 122                 ((x & 0xff00000000000000ULL) >> 56);
 123 }
 124
 125
 126 #ifdef __DOXYGEN__
 127
 128 /**
 129  * Swap bytes in a 16-bit value.
 130  */
 131 static uint16_t rte_bswap16(uint16_t _x);
 132
 133 /**
 134  * Swap bytes in a 32-bit value.
 135  */
 136 static uint32_t rte_bswap32(uint32_t x);
 137
 138 /**
 139  * Swap bytes in a 64-bit value.
 140  */
 141 static uint64_t rte_bswap64(uint64_t x);
 142
 143 /**
 144  * Convert a 16-bit value from CPU order to little endian.
 145  */
 146 static uint16_t rte_cpu_to_le_16(uint16_t x);
 147
 148 /**
 149  * Convert a 32-bit value from CPU order to little endian.
 150  */
 151 static uint32_t rte_cpu_to_le_32(uint32_t x);
 152
 153 /**
 154  * Convert a 64-bit value from CPU order to little endian.
 155  */
 156 static uint64_t rte_cpu_to_le_64(uint64_t x);
 157
 158
 159 /**
 160  * Convert a 16-bit value from CPU order to big endian.
 161  */
 162 static uint16_t rte_cpu_to_be_16(uint16_t x);
 163
 164 /**
 165  * Convert a 32-bit value from CPU order to big endian.
 166  */
 167 static uint32_t rte_cpu_to_be_32(uint32_t x);
 168
 169 /**
 170  * Convert a 64-bit value from CPU order to big endian.
 171  */
 172 static uint64_t rte_cpu_to_be_64(uint64_t x);
 173
 174
 175 /**
 176  * Convert a 16-bit value from little endian to CPU order.
 177  */
 178 static uint16_t rte_le_to_cpu_16(uint16_t x);
 179
 180 /**
 181  * Convert a 32-bit value from little endian to CPU order.
 182  */
 183 static uint32_t rte_le_to_cpu_32(uint32_t x);
 184
 185 /**
 186  * Convert a 64-bit value from little endian to CPU order.
 187  */
 188 static uint64_t rte_le_to_cpu_64(uint64_t x);
 189
 190
 191 /**
 192  * Convert a 16-bit value from big endian to CPU order.
 193  */
 194 static uint16_t rte_be_to_cpu_16(uint16_t x);
 195
 196 /**
 197  * Convert a 32-bit value from big endian to CPU order.
 198  */
 199 static uint32_t rte_be_to_cpu_32(uint32_t x);
 200
 201 /**
 202  * Convert a 64-bit value from big endian to CPU order.
 203  */
 204 static uint64_t rte_be_to_cpu_64(uint64_t x);
 205
 206 #endif /* __DOXYGEN__ */
 207
 208 #ifdef RTE_FORCE_INTRINSICS
 209 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
 210 #define rte_bswap16(x) __builtin_bswap16(x)
 211 #endif
 212
 213 #define rte_bswap32(x) __builtin_bswap32(x)
 214
 215 #define rte_bswap64(x) __builtin_bswap64(x)
 216
 217 #endif
 218
 219 #endif /* _RTE_BYTEORDER_H_ */