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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.
49 * An internal function to swap bytes in a 16-bit value.
51 * It is used by rte_bswap16() when the value is constant. Do not use
52 * this function directly; rte_bswap16() is preferred.
54 static inline uint16_t
55 rte_constant_bswap16(uint16_t x)
57 return (uint16_t)(((x & 0x00ffU) << 8) |
58 ((x & 0xff00U) >> 8));
62 * An internal function to swap bytes in a 32-bit value.
64 * It is used by rte_bswap32() when the value is constant. Do not use
65 * this function directly; rte_bswap32() is preferred.
67 static inline uint32_t
68 rte_constant_bswap32(uint32_t x)
70 return ((x & 0x000000ffUL) << 24) |
71 ((x & 0x0000ff00UL) << 8) |
72 ((x & 0x00ff0000UL) >> 8) |
73 ((x & 0xff000000UL) >> 24);
77 * An internal function to swap bytes of a 64-bit value.
79 * It is used by rte_bswap64() when the value is constant. Do not use
80 * this function directly; rte_bswap64() is preferred.
82 static inline uint64_t
83 rte_constant_bswap64(uint64_t x)
85 return ((x & 0x00000000000000ffULL) << 56) |
86 ((x & 0x000000000000ff00ULL) << 40) |
87 ((x & 0x0000000000ff0000ULL) << 24) |
88 ((x & 0x00000000ff000000ULL) << 8) |
89 ((x & 0x000000ff00000000ULL) >> 8) |
90 ((x & 0x0000ff0000000000ULL) >> 24) |
91 ((x & 0x00ff000000000000ULL) >> 40) |
92 ((x & 0xff00000000000000ULL) >> 56);
99 * Swap bytes in a 16-bit value.
101 static uint16_t rte_bswap16(uint16_t _x);
104 * Swap bytes in a 32-bit value.
106 static uint32_t rte_bswap32(uint32_t x);
109 * Swap bytes in a 64-bit value.
111 static uint64_t rte_bswap64(uint64_t x);
114 * Convert a 16-bit value from CPU order to little endian.
116 static uint16_t rte_cpu_to_le_16(uint16_t x);
119 * Convert a 32-bit value from CPU order to little endian.
121 static uint32_t rte_cpu_to_le_32(uint32_t x);
124 * Convert a 64-bit value from CPU order to little endian.
126 static uint64_t rte_cpu_to_le_64(uint64_t x);
130 * Convert a 16-bit value from CPU order to big endian.
132 static uint16_t rte_cpu_to_be_16(uint16_t x);
135 * Convert a 32-bit value from CPU order to big endian.
137 static uint32_t rte_cpu_to_be_32(uint32_t x);
140 * Convert a 64-bit value from CPU order to big endian.
142 static uint64_t rte_cpu_to_be_64(uint64_t x);
146 * Convert a 16-bit value from little endian to CPU order.
148 static uint16_t rte_le_to_cpu_16(uint16_t x);
151 * Convert a 32-bit value from little endian to CPU order.
153 static uint32_t rte_le_to_cpu_32(uint32_t x);
156 * Convert a 64-bit value from little endian to CPU order.
158 static uint64_t rte_le_to_cpu_64(uint64_t x);
162 * Convert a 16-bit value from big endian to CPU order.
164 static uint16_t rte_be_to_cpu_16(uint16_t x);
167 * Convert a 32-bit value from big endian to CPU order.
169 static uint32_t rte_be_to_cpu_32(uint32_t x);
172 * Convert a 64-bit value from big endian to CPU order.
174 static uint64_t rte_be_to_cpu_64(uint64_t x);
176 #endif /* __DOXYGEN__ */
178 #ifdef RTE_FORCE_INTRINSICS
179 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
180 #define rte_bswap16(x) __builtin_bswap16(x)
183 #define rte_bswap32(x) __builtin_bswap32(x)
185 #define rte_bswap64(x) __builtin_bswap64(x)
189 #endif /* _RTE_BYTEORDER_H_ */