src/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 #if defined (__aarch64__)
  60   if (!__builtin_constant_p (x))
  61     {
  62     __asm__ ("rev16 %w0, %w0":"+r" (x));
  63       return x;
  64     }
  65 #endif
  66   return (x >> 8) | (x << 8);
  67 }
  68
  69 always_inline i16
  70 clib_byte_swap_i16 (i16 x)
  71 {
  72   return clib_byte_swap_u16 (x);
  73 }
  74
  75 always_inline u32
  76 clib_byte_swap_u32 (u32 x)
  77 {
  78 #if defined (i386) || defined (__x86_64__)
  79   if (!__builtin_constant_p (x))
  80     {
  81       asm volatile ("bswap %0":"=r" (x):"0" (x));
  82       return x;
  83     }
  84 #elif defined (__aarch64__)
  85   if (!__builtin_constant_p (x))
  86     {
  87     __asm__ ("rev %w0, %w0":"+r" (x));
  88       return x;
  89     }
  90 #endif
  91   return ((x << 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00) | (x >> 24));
  92 }
  93
  94 always_inline i32
  95 clib_byte_swap_i32 (i32 x)
  96 {
  97   return clib_byte_swap_u32 (x);
  98 }
  99
 100 always_inline u64
 101 clib_byte_swap_u64 (u64 x)
 102 {
 103 #if defined (__x86_64__)
 104   if (!__builtin_constant_p (x))
 105     {
 106       asm volatile ("bswapq %0":"=r" (x):"0" (x));
 107       return x;
 108     }
 109 #elif defined (__aarch64__)
 110   if (!__builtin_constant_p (x))
 111     {
 112     __asm__ ("rev %0, %0":"+r" (x));
 113       return x;
 114     }
 115 #endif
 116 #define _(x,n,i) \
 117   ((((x) >> (8*(i))) & 0xff) << (8*((n)-(i)-1)))
 118   return (_(x, 8, 0) | _(x, 8, 1)
 119           | _(x, 8, 2) | _(x, 8, 3)
 120           | _(x, 8, 4) | _(x, 8, 5) | _(x, 8, 6) | _(x, 8, 7));
 121 #undef _
 122 }
 123
 124 always_inline i64
 125 clib_byte_swap_i64 (i64 x)
 126 {
 127   return clib_byte_swap_u64 (x);
 128 }
 129
 130 #define _(sex,type)                                             \
 131 /* HOST -> SEX */                                               \
 132 always_inline type                                              \
 133 clib_host_to_##sex##_##type (type x)                            \
 134 {                                                               \
 135   if (! clib_arch_is_##sex##_endian)                            \
 136     x = clib_byte_swap_##type (x);                              \
 137   return x;                                                     \
 138 }                                                               \
 139                                                                 \
 140 always_inline type                                              \
 141 clib_host_to_##sex##_mem_##type (type * x)                      \
 142 {                                                               \
 143   type v = x[0];                                                \
 144   return clib_host_to_##sex##_##type (v);                       \
 145 }                                                               \
 146                                                                 \
 147 always_inline type                                              \
 148 clib_host_to_##sex##_unaligned_mem_##type (type * x)            \
 149 {                                                               \
 150   type v = clib_mem_unaligned (x, type);                        \
 151   return clib_host_to_##sex##_##type (v);                       \
 152 }                                                               \
 153                                                                 \
 154 /* SEX -> HOST */                                               \
 155 always_inline type                                              \
 156 clib_##sex##_to_host_##type (type x)                            \
 157 { return clib_host_to_##sex##_##type (x); }                     \
 158                                                                 \
 159 always_inline type                                              \
 160 clib_##sex##_to_host_mem_##type (type * x)                      \
 161 { return clib_host_to_##sex##_mem_##type (x); }                 \
 162                                                                 \
 163 always_inline type                                              \
 164 clib_##sex##_to_host_unaligned_mem_##type (type * x)            \
 165 { return clib_host_to_##sex##_unaligned_mem_##type (x); }
 166
 167 #ifndef __cplusplus
 168 _(little, u16)
 169 _(little, u32)
 170 _(little, u64)
 171 _(little, i16)
 172 _(little, i32)
 173 _(little, i64)
 174 _(big, u16) _(big, u32) _(big, u64) _(big, i16) _(big, i32) _(big, i64)
 175 #endif
 176 #undef _
 177 /* Network "net" alias for "big". */
 178 #define _(type)                                         \
 179 always_inline type                                      \
 180 clib_net_to_host_##type (type x)                        \
 181 { return clib_big_to_host_##type (x); }                 \
 182                                                         \
 183 always_inline type                                      \
 184 clib_net_to_host_mem_##type (type * x)                  \
 185 { return clib_big_to_host_mem_##type (x); }             \
 186                                                         \
 187 always_inline type                                      \
 188 clib_net_to_host_unaligned_mem_##type (type * x)        \
 189 { return clib_big_to_host_unaligned_mem_##type (x); }   \
 190                                                         \
 191 always_inline type                                      \
 192 clib_host_to_net_##type (type x)                        \
 193 { return clib_host_to_big_##type (x); }                 \
 194                                                         \
 195 always_inline type                                      \
 196 clib_host_to_net_mem_##type (type * x)                  \
 197 { return clib_host_to_big_mem_##type (x); }             \
 198                                                         \
 199 always_inline type                                      \
 200 clib_host_to_net_unaligned_mem_##type (type * x)        \
 201 { return clib_host_to_big_unaligned_mem_##type (x); }
 202 #ifndef __cplusplus
 203   _(u16);
 204 _(i16);
 205 _(u32);
 206 _(i32);
 207 _(u64);
 208 _(i64);
 209 #endif
 210
 211 #undef _
 212
 213 #endif /* included_clib_byte_order_h */
 214
 215 /*
 216  * fd.io coding-style-patch-verification: ON
 217  *
 218  * Local Variables:
 219  * eval: (c-set-style "gnu")
 220  * End:
 221  */