ceph/src/dpdk/lib/librte_eal/common/include/arch/ppc_64/rte_byteorder.h

   1 /*
   2  *   BSD LICENSE
   3  *
   4  *   Copyright (C) IBM Corporation 2014.
   5  *
   6  *   Redistribution and use in source and binary forms, with or without
   7  *   modification, are permitted provided that the following conditions
   8  *   are met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in
  14  *       the documentation and/or other materials provided with the
  15  *       distribution.
  16  *     * Neither the name of IBM Corporation nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31 */
  32
  33 /* Inspired from FreeBSD src/sys/powerpc/include/endian.h
  34  * Copyright (c) 1987, 1991, 1993
  35  * The Regents of the University of California.  All rights reserved.
  36 */
  37
  38 #ifndef _RTE_BYTEORDER_PPC_64_H_
  39 #define _RTE_BYTEORDER_PPC_64_H_
  40
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif
  44
  45 #include <stdint.h>
  46 #include "generic/rte_byteorder.h"
  47
  48 /*
  49  * An architecture-optimized byte swap for a 16-bit value.
  50  *
  51  * Do not use this function directly. The preferred function is rte_bswap16().
  52  */
  53 static inline uint16_t rte_arch_bswap16(uint16_t _x)
  54 {
  55         return (_x >> 8) | ((_x << 8) & 0xff00);
  56 }
  57
  58 /*
  59  * An architecture-optimized byte swap for a 32-bit value.
  60  *
  61  * Do not use this function directly. The preferred function is rte_bswap32().
  62  */
  63 static inline uint32_t rte_arch_bswap32(uint32_t _x)
  64 {
  65         return (_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
  66                 ((_x << 24) & 0xff000000);
  67 }
  68
  69 /*
  70  * An architecture-optimized byte swap for a 64-bit value.
  71  *
  72   * Do not use this function directly. The preferred function is rte_bswap64().
  73  */
  74 /* 64-bit mode */
  75 static inline uint64_t rte_arch_bswap64(uint64_t _x)
  76 {
  77         return (_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
  78                 ((_x >> 8) & 0xff000000) | ((_x << 8) & (0xffULL << 32)) |
  79                 ((_x << 24) & (0xffULL << 40)) |
  80                 ((_x << 40) & (0xffULL << 48)) | ((_x << 56));
  81 }
  82
  83 #ifndef RTE_FORCE_INTRINSICS
  84 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?            \
  85                                    rte_constant_bswap16(x) :            \
  86                                    rte_arch_bswap16(x)))
  87
  88 #define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ?            \
  89                                    rte_constant_bswap32(x) :            \
  90                                    rte_arch_bswap32(x)))
  91
  92 #define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ?            \
  93                                    rte_constant_bswap64(x) :            \
  94                                    rte_arch_bswap64(x)))
  95 #else
  96 /*
  97  * __builtin_bswap16 is only available gcc 4.8 and upwards
  98  */
  99 #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
 100 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?            \
 101                                    rte_constant_bswap16(x) :            \
 102                                    rte_arch_bswap16(x)))
 103 #endif
 104 #endif
 105
 106 /* Power 8 have both little endian and big endian mode
 107  * Power 7 only support big endian
 108  */
 109 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
 110
 111 #define rte_cpu_to_le_16(x) (x)
 112 #define rte_cpu_to_le_32(x) (x)
 113 #define rte_cpu_to_le_64(x) (x)
 114
 115 #define rte_cpu_to_be_16(x) rte_bswap16(x)
 116 #define rte_cpu_to_be_32(x) rte_bswap32(x)
 117 #define rte_cpu_to_be_64(x) rte_bswap64(x)
 118
 119 #define rte_le_to_cpu_16(x) (x)
 120 #define rte_le_to_cpu_32(x) (x)
 121 #define rte_le_to_cpu_64(x) (x)
 122
 123 #define rte_be_to_cpu_16(x) rte_bswap16(x)
 124 #define rte_be_to_cpu_32(x) rte_bswap32(x)
 125 #define rte_be_to_cpu_64(x) rte_bswap64(x)
 126
 127 #else /* RTE_BIG_ENDIAN */
 128
 129 #define rte_cpu_to_le_16(x) rte_bswap16(x)
 130 #define rte_cpu_to_le_32(x) rte_bswap32(x)
 131 #define rte_cpu_to_le_64(x) rte_bswap64(x)
 132
 133 #define rte_cpu_to_be_16(x) (x)
 134 #define rte_cpu_to_be_32(x) (x)
 135 #define rte_cpu_to_be_64(x) (x)
 136
 137 #define rte_le_to_cpu_16(x) rte_bswap16(x)
 138 #define rte_le_to_cpu_32(x) rte_bswap32(x)
 139 #define rte_le_to_cpu_64(x) rte_bswap64(x)
 140
 141 #define rte_be_to_cpu_16(x) (x)
 142 #define rte_be_to_cpu_32(x) (x)
 143 #define rte_be_to_cpu_64(x) (x)
 144 #endif
 145
 146 #ifdef __cplusplus
 147 }
 148 #endif
 149
 150 #endif /* _RTE_BYTEORDER_PPC_64_H_ */