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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.
53 * An internal function to swap bytes in a 16-bit value.
55 * It is used by rte_bswap16() when the value is constant. Do not use
56 * this function directly; rte_bswap16() is preferred.
58 static inline uint16_t
59 rte_constant_bswap16(uint16_t x)
61 return (uint16_t)(((x & 0x00ffU) << 8) |
62 ((x & 0xff00U) >> 8));
66 * An internal function to swap bytes in a 32-bit value.
68 * It is used by rte_bswap32() when the value is constant. Do not use
69 * this function directly; rte_bswap32() is preferred.
71 static inline uint32_t
72 rte_constant_bswap32(uint32_t x)
74 return ((x & 0x000000ffUL) << 24) |
75 ((x & 0x0000ff00UL) << 8) |
76 ((x & 0x00ff0000UL) >> 8) |
77 ((x & 0xff000000UL) >> 24);
81 * An internal function to swap bytes of a 64-bit value.
83 * It is used by rte_bswap64() when the value is constant. Do not use
84 * this function directly; rte_bswap64() is preferred.
86 static inline uint64_t
87 rte_constant_bswap64(uint64_t x)
89 return ((x & 0x00000000000000ffULL) << 56) |
90 ((x & 0x000000000000ff00ULL) << 40) |
91 ((x & 0x0000000000ff0000ULL) << 24) |
92 ((x & 0x00000000ff000000ULL) << 8) |
93 ((x & 0x000000ff00000000ULL) >> 8) |
94 ((x & 0x0000ff0000000000ULL) >> 24) |
95 ((x & 0x00ff000000000000ULL) >> 40) |
96 ((x & 0xff00000000000000ULL) >> 56);
100 * An architecture-optimized byte swap for a 16-bit value.
102 * Do not use this function directly. The preferred function is rte_bswap16().
104 static inline uint16_t rte_arch_bswap16(uint16_t _x)
106 register uint16_t x = _x;
107 asm volatile ("xchgb %b[x1],%h[x2]"
115 * An architecture-optimized byte swap for a 32-bit value.
117 * Do not use this function directly. The preferred function is rte_bswap32().
119 static inline uint32_t rte_arch_bswap32(uint32_t _x)
121 register uint32_t x = _x;
122 asm volatile ("bswap %[x]"
129 * An architecture-optimized byte swap for a 64-bit value.
131 * Do not use this function directly. The preferred function is rte_bswap64().
133 #ifdef RTE_ARCH_X86_64
135 static inline uint64_t rte_arch_bswap64(uint64_t _x)
137 register uint64_t x = _x;
138 asm volatile ("bswap %[x]"
143 #else /* ! RTE_ARCH_X86_64 */
144 /* Compat./Leg. mode */
145 static inline uint64_t rte_arch_bswap64(uint64_t x)
148 ret |= ((uint64_t)rte_arch_bswap32(x & 0xffffffffUL) << 32);
149 ret |= ((uint64_t)rte_arch_bswap32((x >> 32) & 0xffffffffUL));
152 #endif /* RTE_ARCH_X86_64 */
155 #ifndef RTE_FORCE_INTRINSICS
157 * Swap bytes in a 16-bit value.
159 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ? \
160 rte_constant_bswap16(x) : \
161 rte_arch_bswap16(x)))
164 * Swap bytes in a 32-bit value.
166 #define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ? \
167 rte_constant_bswap32(x) : \
168 rte_arch_bswap32(x)))
171 * Swap bytes in a 64-bit value.
173 #define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ? \
174 rte_constant_bswap64(x) : \
175 rte_arch_bswap64(x)))
180 * Swap bytes in a 16-bit value.
181 * __builtin_bswap16 is only available gcc 4.8 and upwards
183 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
184 #define rte_bswap16(x) __builtin_bswap16(x)
186 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ? \
187 rte_constant_bswap16(x) : \
188 rte_arch_bswap16(x)))
192 * Swap bytes in a 32-bit value.
194 #define rte_bswap32(x) __builtin_bswap32(x)
197 * Swap bytes in a 64-bit value.
199 #define rte_bswap64(x) __builtin_bswap64(x)
204 * Convert a 16-bit value from CPU order to little endian.
206 #define rte_cpu_to_le_16(x) (x)
209 * Convert a 32-bit value from CPU order to little endian.
211 #define rte_cpu_to_le_32(x) (x)
214 * Convert a 64-bit value from CPU order to little endian.
216 #define rte_cpu_to_le_64(x) (x)
220 * Convert a 16-bit value from CPU order to big endian.
222 #define rte_cpu_to_be_16(x) rte_bswap16(x)
225 * Convert a 32-bit value from CPU order to big endian.
227 #define rte_cpu_to_be_32(x) rte_bswap32(x)
230 * Convert a 64-bit value from CPU order to big endian.
232 #define rte_cpu_to_be_64(x) rte_bswap64(x)
236 * Convert a 16-bit value from little endian to CPU order.
238 #define rte_le_to_cpu_16(x) (x)
241 * Convert a 32-bit value from little endian to CPU order.
243 #define rte_le_to_cpu_32(x) (x)
246 * Convert a 64-bit value from little endian to CPU order.
248 #define rte_le_to_cpu_64(x) (x)
252 * Convert a 16-bit value from big endian to CPU order.
254 #define rte_be_to_cpu_16(x) rte_bswap16(x)
257 * Convert a 32-bit value from big endian to CPU order.
259 #define rte_be_to_cpu_32(x) rte_bswap32(x)
262 * Convert a 64-bit value from big endian to CPU order.
264 #define rte_be_to_cpu_64(x) rte_bswap64(x)
270 #endif /* _RTE_BYTEORDER_H_ */