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

   1 /*
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2015 RehiveTech. All rights reserved.
   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 RehiveTech 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 #ifndef _RTE_BYTEORDER_ARM_H_
  34 #define _RTE_BYTEORDER_ARM_H_
  35
  36 #ifndef RTE_FORCE_INTRINSICS
  37 #  error Platform must be built with CONFIG_RTE_FORCE_INTRINSICS
  38 #endif
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 #include <stdint.h>
  45 #include <rte_common.h>
  46 #include "generic/rte_byteorder.h"
  47
  48 /* fix missing __builtin_bswap16 for gcc older then 4.8 */
  49 #if !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
  50
  51 static inline uint16_t rte_arch_bswap16(uint16_t _x)
  52 {
  53         register uint16_t x = _x;
  54
  55         asm volatile ("rev16 %0,%1"
  56                       : "=r" (x)
  57                       : "r" (x)
  58                       );
  59         return x;
  60 }
  61
  62 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ? \
  63                                    rte_constant_bswap16(x) : \
  64                                    rte_arch_bswap16(x)))
  65 #endif
  66
  67 /* ARM architecture is bi-endian (both big and little). */
  68 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  69
  70 #define rte_cpu_to_le_16(x) (x)
  71 #define rte_cpu_to_le_32(x) (x)
  72 #define rte_cpu_to_le_64(x) (x)
  73
  74 #define rte_cpu_to_be_16(x) rte_bswap16(x)
  75 #define rte_cpu_to_be_32(x) rte_bswap32(x)
  76 #define rte_cpu_to_be_64(x) rte_bswap64(x)
  77
  78 #define rte_le_to_cpu_16(x) (x)
  79 #define rte_le_to_cpu_32(x) (x)
  80 #define rte_le_to_cpu_64(x) (x)
  81
  82 #define rte_be_to_cpu_16(x) rte_bswap16(x)
  83 #define rte_be_to_cpu_32(x) rte_bswap32(x)
  84 #define rte_be_to_cpu_64(x) rte_bswap64(x)
  85
  86 #else /* RTE_BIG_ENDIAN */
  87
  88 #define rte_cpu_to_le_16(x) rte_bswap16(x)
  89 #define rte_cpu_to_le_32(x) rte_bswap32(x)
  90 #define rte_cpu_to_le_64(x) rte_bswap64(x)
  91
  92 #define rte_cpu_to_be_16(x) (x)
  93 #define rte_cpu_to_be_32(x) (x)
  94 #define rte_cpu_to_be_64(x) (x)
  95
  96 #define rte_le_to_cpu_16(x) rte_bswap16(x)
  97 #define rte_le_to_cpu_32(x) rte_bswap32(x)
  98 #define rte_le_to_cpu_64(x) rte_bswap64(x)
  99
 100 #define rte_be_to_cpu_16(x) (x)
 101 #define rte_be_to_cpu_32(x) (x)
 102 #define rte_be_to_cpu_64(x) (x)
 103 #endif
 104
 105 #ifdef __cplusplus
 106 }
 107 #endif
 108
 109 #endif /* _RTE_BYTEORDER_ARM_H_ */