vppinfra/vppinfra/byte_order.h

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16   Copyright (c) 2004 Eliot Dresselhaus
  17
  18   Permission is hereby granted, free of charge, to any person obtaining
  19   a copy of this software and associated documentation files (the
  20   "Software"), to deal in the Software without restriction, including
  21   without limitation the rights to use, copy, modify, merge, publish,
  22   distribute, sublicense, and/or sell copies of the Software, and to
  23   permit persons to whom the Software is furnished to do so, subject to
  24   the following conditions:
  25
  26   The above copyright notice and this permission notice shall be
  27   included in all copies or substantial portions of the Software.
  28
  29   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  33   LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  34   OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  35   WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  36 */
  37
  38 #ifndef included_clib_byte_order_h
  39 #define included_clib_byte_order_h
  40
  41 #include <vppinfra/clib.h>
  42
  43 #if (__BYTE_ORDER__)==( __ORDER_LITTLE_ENDIAN__)
  44 #define CLIB_ARCH_IS_BIG_ENDIAN (0)
  45 #define CLIB_ARCH_IS_LITTLE_ENDIAN (1)
  46 #else
  47 /* Default is big endian. */
  48 #define CLIB_ARCH_IS_BIG_ENDIAN (1)
  49 #define CLIB_ARCH_IS_LITTLE_ENDIAN (0)
  50 #endif
  51
  52 /* Big/little endian. */
  53 #define clib_arch_is_big_endian    CLIB_ARCH_IS_BIG_ENDIAN
  54 #define clib_arch_is_little_endian CLIB_ARCH_IS_LITTLE_ENDIAN
  55
  56 always_inline u16
  57 clib_byte_swap_u16 (u16 x)
  58 {
  59   return (x >> 8) | (x << 8);
  60 }
  61
  62 always_inline i16
  63 clib_byte_swap_i16 (i16 x)
  64 {
  65   return clib_byte_swap_u16 (x);
  66 }
  67
  68 always_inline u32
  69 clib_byte_swap_u32 (u32 x)
  70 {
  71 #if defined (i386) || defined (__x86_64__)
  72   if (!__builtin_constant_p (x))
  73     {
  74       asm volatile ("bswap %0":"=r" (x):"0" (x));
  75       return x;
  76     }
  77 #endif
  78   return ((x << 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00) | (x >> 24));
  79 }
  80
  81 always_inline i32
  82 clib_byte_swap_i32 (i32 x)
  83 {
  84   return clib_byte_swap_u32 (x);
  85 }
  86
  87 always_inline u64
  88 clib_byte_swap_u64 (u64 x)
  89 {
  90 #if defined (__x86_64__)
  91   if (!__builtin_constant_p (x))
  92     {
  93       asm volatile ("bswapq %0":"=r" (x):"0" (x));
  94       return x;
  95     }
  96 #endif
  97 #define _(x,n,i) \
  98   ((((x) >> (8*(i))) & 0xff) << (8*((n)-(i)-1)))
  99   return (_(x, 8, 0) | _(x, 8, 1)
 100           | _(x, 8, 2) | _(x, 8, 3)
 101           | _(x, 8, 4) | _(x, 8, 5) | _(x, 8, 6) | _(x, 8, 7));
 102 #undef _
 103 }
 104
 105 always_inline i64
 106 clib_byte_swap_i64 (i64 x)
 107 {
 108   return clib_byte_swap_u64 (x);
 109 }
 110
 111 #define _(sex,type)                                             \
 112 /* HOST -> SEX */                                               \
 113 always_inline type                                              \
 114 clib_host_to_##sex##_##type (type x)                            \
 115 {                                                               \
 116   if (! clib_arch_is_##sex##_endian)                            \
 117     x = clib_byte_swap_##type (x);                              \
 118   return x;                                                     \
 119 }                                                               \
 120                                                                 \
 121 always_inline type                                              \
 122 clib_host_to_##sex##_mem_##type (type * x)                      \
 123 {                                                               \
 124   type v = x[0];                                                \
 125   return clib_host_to_##sex##_##type (v);                       \
 126 }                                                               \
 127                                                                 \
 128 always_inline type                                              \
 129 clib_host_to_##sex##_unaligned_mem_##type (type * x)            \
 130 {                                                               \
 131   type v = clib_mem_unaligned (x, type);                        \
 132   return clib_host_to_##sex##_##type (v);                       \
 133 }                                                               \
 134                                                                 \
 135 /* SEX -> HOST */                                               \
 136 always_inline type                                              \
 137 clib_##sex##_to_host_##type (type x)                            \
 138 { return clib_host_to_##sex##_##type (x); }                     \
 139                                                                 \
 140 always_inline type                                              \
 141 clib_##sex##_to_host_mem_##type (type * x)                      \
 142 { return clib_host_to_##sex##_mem_##type (x); }                 \
 143                                                                 \
 144 always_inline type                                              \
 145 clib_##sex##_to_host_unaligned_mem_##type (type * x)            \
 146 { return clib_host_to_##sex##_unaligned_mem_##type (x); }
 147
 148 #ifndef __cplusplus
 149 _(little, u16)
 150 _(little, u32)
 151 _(little, u64)
 152 _(little, i16)
 153 _(little, i32)
 154 _(little, i64)
 155 _(big, u16) _(big, u32) _(big, u64) _(big, i16) _(big, i32) _(big, i64)
 156 #endif
 157 #undef _
 158 /* Network "net" alias for "big". */
 159 #define _(type)                                         \
 160 always_inline type                                      \
 161 clib_net_to_host_##type (type x)                        \
 162 { return clib_big_to_host_##type (x); }                 \
 163                                                         \
 164 always_inline type                                      \
 165 clib_net_to_host_mem_##type (type * x)                  \
 166 { return clib_big_to_host_mem_##type (x); }             \
 167                                                         \
 168 always_inline type                                      \
 169 clib_net_to_host_unaligned_mem_##type (type * x)        \
 170 { return clib_big_to_host_unaligned_mem_##type (x); }   \
 171                                                         \
 172 always_inline type                                      \
 173 clib_host_to_net_##type (type x)                        \
 174 { return clib_host_to_big_##type (x); }                 \
 175                                                         \
 176 always_inline type                                      \
 177 clib_host_to_net_mem_##type (type * x)                  \
 178 { return clib_host_to_big_mem_##type (x); }             \
 179                                                         \
 180 always_inline type                                      \
 181 clib_host_to_net_unaligned_mem_##type (type * x)        \
 182 { return clib_host_to_big_unaligned_mem_##type (x); }
 183 #ifndef __cplusplus
 184   _(u16);
 185 _(i16);
 186 _(u32);
 187 _(i32);
 188 _(u64);
 189 _(i64);
 190 #endif
 191
 192 #undef _
 193
 194 #endif /* included_clib_byte_order_h */
 195
 196 /*
 197  * fd.io coding-style-patch-verification: ON
 198  *
 199  * Local Variables:
 200  * eval: (c-set-style "gnu")
 201  * End:
 202  */