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34 #ifndef _RTE_BYTEORDER_H_
35 #define _RTE_BYTEORDER_H_
40 * Byte Swap Operations
42 * This file defines a generic API for byte swap operations. Part of
43 * the implementation is architecture-specific.
47 #ifdef RTE_EXEC_ENV_BSDAPP
48 #include <sys/endian.h>
53 #include <rte_common.h>
56 * Compile-time endianness detection
58 #define RTE_BIG_ENDIAN 1
59 #define RTE_LITTLE_ENDIAN 2
60 #if defined __BYTE_ORDER__
61 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
62 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
63 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
64 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
65 #endif /* __BYTE_ORDER__ */
66 #elif defined __BYTE_ORDER
67 #if __BYTE_ORDER == __BIG_ENDIAN
68 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
69 #elif __BYTE_ORDER == __LITTLE_ENDIAN
70 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
71 #endif /* __BYTE_ORDER */
72 #elif defined __BIG_ENDIAN__
73 #define RTE_BYTE_ORDER RTE_BIG_ENDIAN
74 #elif defined __LITTLE_ENDIAN__
75 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
79 * The following types should be used when handling values according to a
80 * specific byte ordering, which may differ from that of the host CPU.
82 * Libraries, public APIs and applications are encouraged to use them for
83 * documentation purposes.
85 typedef uint16_t rte_be16_t; /**< 16-bit big-endian value. */
86 typedef uint32_t rte_be32_t; /**< 32-bit big-endian value. */
87 typedef uint64_t rte_be64_t; /**< 64-bit big-endian value. */
88 typedef uint16_t rte_le16_t; /**< 16-bit little-endian value. */
89 typedef uint32_t rte_le32_t; /**< 32-bit little-endian value. */
90 typedef uint64_t rte_le64_t; /**< 64-bit little-endian value. */
93 * An internal function to swap bytes in a 16-bit value.
95 * It is used by rte_bswap16() when the value is constant. Do not use
96 * this function directly; rte_bswap16() is preferred.
98 static inline uint16_t
99 rte_constant_bswap16(uint16_t x)
101 return (uint16_t)(((x & 0x00ffU) << 8) |
102 ((x & 0xff00U) >> 8));
106 * An internal function to swap bytes in a 32-bit value.
108 * It is used by rte_bswap32() when the value is constant. Do not use
109 * this function directly; rte_bswap32() is preferred.
111 static inline uint32_t
112 rte_constant_bswap32(uint32_t x)
114 return ((x & 0x000000ffUL) << 24) |
115 ((x & 0x0000ff00UL) << 8) |
116 ((x & 0x00ff0000UL) >> 8) |
117 ((x & 0xff000000UL) >> 24);
121 * An internal function to swap bytes of a 64-bit value.
123 * It is used by rte_bswap64() when the value is constant. Do not use
124 * this function directly; rte_bswap64() is preferred.
126 static inline uint64_t
127 rte_constant_bswap64(uint64_t x)
129 return ((x & 0x00000000000000ffULL) << 56) |
130 ((x & 0x000000000000ff00ULL) << 40) |
131 ((x & 0x0000000000ff0000ULL) << 24) |
132 ((x & 0x00000000ff000000ULL) << 8) |
133 ((x & 0x000000ff00000000ULL) >> 8) |
134 ((x & 0x0000ff0000000000ULL) >> 24) |
135 ((x & 0x00ff000000000000ULL) >> 40) |
136 ((x & 0xff00000000000000ULL) >> 56);
143 * Swap bytes in a 16-bit value.
145 static uint16_t rte_bswap16(uint16_t _x);
148 * Swap bytes in a 32-bit value.
150 static uint32_t rte_bswap32(uint32_t x);
153 * Swap bytes in a 64-bit value.
155 static uint64_t rte_bswap64(uint64_t x);
158 * Convert a 16-bit value from CPU order to little endian.
160 static rte_le16_t rte_cpu_to_le_16(uint16_t x);
163 * Convert a 32-bit value from CPU order to little endian.
165 static rte_le32_t rte_cpu_to_le_32(uint32_t x);
168 * Convert a 64-bit value from CPU order to little endian.
170 static rte_le64_t rte_cpu_to_le_64(uint64_t x);
174 * Convert a 16-bit value from CPU order to big endian.
176 static rte_be16_t rte_cpu_to_be_16(uint16_t x);
179 * Convert a 32-bit value from CPU order to big endian.
181 static rte_be32_t rte_cpu_to_be_32(uint32_t x);
184 * Convert a 64-bit value from CPU order to big endian.
186 static rte_be64_t rte_cpu_to_be_64(uint64_t x);
190 * Convert a 16-bit value from little endian to CPU order.
192 static uint16_t rte_le_to_cpu_16(rte_le16_t x);
195 * Convert a 32-bit value from little endian to CPU order.
197 static uint32_t rte_le_to_cpu_32(rte_le32_t x);
200 * Convert a 64-bit value from little endian to CPU order.
202 static uint64_t rte_le_to_cpu_64(rte_le64_t x);
206 * Convert a 16-bit value from big endian to CPU order.
208 static uint16_t rte_be_to_cpu_16(rte_be16_t x);
211 * Convert a 32-bit value from big endian to CPU order.
213 static uint32_t rte_be_to_cpu_32(rte_be32_t x);
216 * Convert a 64-bit value from big endian to CPU order.
218 static uint64_t rte_be_to_cpu_64(rte_be64_t x);
220 #endif /* __DOXYGEN__ */
222 #ifdef RTE_FORCE_INTRINSICS
223 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
224 #define rte_bswap16(x) __builtin_bswap16(x)
227 #define rte_bswap32(x) __builtin_bswap32(x)
229 #define rte_bswap64(x) __builtin_bswap64(x)
233 #endif /* _RTE_BYTEORDER_H_ */