DPDK  16.04.0
rte_byteorder.h
Go to the documentation of this file.
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 
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 /*
54  * Compile-time endianness detection
55  */
56 #define RTE_BIG_ENDIAN 1
57 #define RTE_LITTLE_ENDIAN 2
58 #if defined __BYTE_ORDER__
59 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
60 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
61 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
62 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
63 #endif /* __BYTE_ORDER__ */
64 #elif defined __BYTE_ORDER
65 #if __BYTE_ORDER == __BIG_ENDIAN
66 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
67 #elif __BYTE_ORDER == __LITTLE_ENDIAN
68 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
69 #endif /* __BYTE_ORDER */
70 #elif defined __BIG_ENDIAN__
71 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
72 #elif defined __LITTLE_ENDIAN__
73 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
74 #endif
75 
76 /*
77  * An internal function to swap bytes in a 16-bit value.
78  *
79  * It is used by rte_bswap16() when the value is constant. Do not use
80  * this function directly; rte_bswap16() is preferred.
81  */
82 static inline uint16_t
83 rte_constant_bswap16(uint16_t x)
84 {
85  return (uint16_t)(((x & 0x00ffU) << 8) |
86  ((x & 0xff00U) >> 8));
87 }
88 
89 /*
90  * An internal function to swap bytes in a 32-bit value.
91  *
92  * It is used by rte_bswap32() when the value is constant. Do not use
93  * this function directly; rte_bswap32() is preferred.
94  */
95 static inline uint32_t
96 rte_constant_bswap32(uint32_t x)
97 {
98  return ((x & 0x000000ffUL) << 24) |
99  ((x & 0x0000ff00UL) << 8) |
100  ((x & 0x00ff0000UL) >> 8) |
101  ((x & 0xff000000UL) >> 24);
102 }
103 
104 /*
105  * An internal function to swap bytes of a 64-bit value.
106  *
107  * It is used by rte_bswap64() when the value is constant. Do not use
108  * this function directly; rte_bswap64() is preferred.
109  */
110 static inline uint64_t
111 rte_constant_bswap64(uint64_t x)
112 {
113  return ((x & 0x00000000000000ffULL) << 56) |
114  ((x & 0x000000000000ff00ULL) << 40) |
115  ((x & 0x0000000000ff0000ULL) << 24) |
116  ((x & 0x00000000ff000000ULL) << 8) |
117  ((x & 0x000000ff00000000ULL) >> 8) |
118  ((x & 0x0000ff0000000000ULL) >> 24) |
119  ((x & 0x00ff000000000000ULL) >> 40) |
120  ((x & 0xff00000000000000ULL) >> 56);
121 }
122 
123 
124 #ifdef __DOXYGEN__
125 
129 static uint16_t rte_bswap16(uint16_t _x);
130 
134 static uint32_t rte_bswap32(uint32_t x);
135 
139 static uint64_t rte_bswap64(uint64_t x);
140 
144 static uint16_t rte_cpu_to_le_16(uint16_t x);
145 
149 static uint32_t rte_cpu_to_le_32(uint32_t x);
150 
154 static uint64_t rte_cpu_to_le_64(uint64_t x);
155 
156 
160 static uint16_t rte_cpu_to_be_16(uint16_t x);
161 
165 static uint32_t rte_cpu_to_be_32(uint32_t x);
166 
170 static uint64_t rte_cpu_to_be_64(uint64_t x);
171 
172 
176 static uint16_t rte_le_to_cpu_16(uint16_t x);
177 
181 static uint32_t rte_le_to_cpu_32(uint32_t x);
182 
186 static uint64_t rte_le_to_cpu_64(uint64_t x);
187 
188 
192 static uint16_t rte_be_to_cpu_16(uint16_t x);
193 
197 static uint32_t rte_be_to_cpu_32(uint32_t x);
198 
202 static uint64_t rte_be_to_cpu_64(uint64_t x);
203 
204 #endif /* __DOXYGEN__ */
205 
206 #ifdef RTE_FORCE_INTRINSICS
207 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
208 #define rte_bswap16(x) __builtin_bswap16(x)
209 #endif
210 
211 #define rte_bswap32(x) __builtin_bswap32(x)
212 
213 #define rte_bswap64(x) __builtin_bswap64(x)
214 
215 #endif
216 
217 #endif /* _RTE_BYTEORDER_H_ */