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35 #ifndef _RTE_BYTEORDER_H_
36 #define _RTE_BYTEORDER_H_
41 * Byte Swap Operations
43 * This file defines a generic API for byte swap operations. Part of
44 * the implementation is architecture-specific.
54 * An internal function to swap bytes in a 16-bit value.
56 * It is used by rte_bswap16() when the value is constant. Do not use
57 * this function directly; rte_bswap16() is preferred.
59 static inline uint16_t
60 rte_constant_bswap16(uint16_t x)
62 return (uint16_t)(((x & 0x00ffU) << 8) |
63 ((x & 0xff00U) >> 8));
67 * An internal function to swap bytes in a 32-bit value.
69 * It is used by rte_bswap32() when the value is constant. Do not use
70 * this function directly; rte_bswap32() is preferred.
72 static inline uint32_t
73 rte_constant_bswap32(uint32_t x)
75 return ((x & 0x000000ffUL) << 24) |
76 ((x & 0x0000ff00UL) << 8) |
77 ((x & 0x00ff0000UL) >> 8) |
78 ((x & 0xff000000UL) >> 24);
82 * An internal function to swap bytes of a 64-bit value.
84 * It is used by rte_bswap64() when the value is constant. Do not use
85 * this function directly; rte_bswap64() is preferred.
87 static inline uint64_t
88 rte_constant_bswap64(uint64_t x)
90 return ((x & 0x00000000000000ffULL) << 56) |
91 ((x & 0x000000000000ff00ULL) << 40) |
92 ((x & 0x0000000000ff0000ULL) << 24) |
93 ((x & 0x00000000ff000000ULL) << 8) |
94 ((x & 0x000000ff00000000ULL) >> 8) |
95 ((x & 0x0000ff0000000000ULL) >> 24) |
96 ((x & 0x00ff000000000000ULL) >> 40) |
97 ((x & 0xff00000000000000ULL) >> 56);
101 * An architecture-optimized byte swap for a 16-bit value.
103 * Do not use this function directly. The preferred function is rte_bswap16().
105 static inline uint16_t rte_arch_bswap16(uint16_t _x)
107 register uint16_t x = _x;
108 asm volatile ("xchgb %b[x1],%h[x2]"
116 * An architecture-optimized byte swap for a 32-bit value.
118 * Do not use this function directly. The preferred function is rte_bswap32().
120 static inline uint32_t rte_arch_bswap32(uint32_t _x)
122 register uint32_t x = _x;
123 asm volatile ("bswap %[x]"
130 * An architecture-optimized byte swap for a 64-bit value.
132 * Do not use this function directly. The preferred function is rte_bswap64().
134 #ifdef RTE_ARCH_X86_64
136 static inline uint64_t rte_arch_bswap64(uint64_t _x)
138 register uint64_t x = _x;
139 asm volatile ("bswap %[x]"
144 #else /* ! RTE_ARCH_X86_64 */
145 /* Compat./Leg. mode */
146 static inline uint64_t rte_arch_bswap64(uint64_t x)
149 ret |= ((uint64_t)rte_arch_bswap32(x & 0xffffffffUL) << 32);
150 ret |= ((uint64_t)rte_arch_bswap32((x >> 32) & 0xffffffffUL));
153 #endif /* RTE_ARCH_X86_64 */
156 * Swap bytes in a 16-bit value.
158 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ? \
159 rte_constant_bswap16(x) : \
160 rte_arch_bswap16(x))) \
163 * Swap bytes in a 32-bit value.
165 #define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ? \
166 rte_constant_bswap32(x) : \
167 rte_arch_bswap32(x))) \
170 * Swap bytes in a 64-bit value.
172 #define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ? \
173 rte_constant_bswap64(x) : \
174 rte_arch_bswap64(x))) \
177 * Convert a 16-bit value from CPU order to little endian.
179 #define rte_cpu_to_le_16(x) (x)
182 * Convert a 32-bit value from CPU order to little endian.
184 #define rte_cpu_to_le_32(x) (x)
187 * Convert a 64-bit value from CPU order to little endian.
189 #define rte_cpu_to_le_64(x) (x)
193 * Convert a 16-bit value from CPU order to big endian.
195 #define rte_cpu_to_be_16(x) rte_bswap16(x)
198 * Convert a 32-bit value from CPU order to big endian.
200 #define rte_cpu_to_be_32(x) rte_bswap32(x)
203 * Convert a 64-bit value from CPU order to big endian.
205 #define rte_cpu_to_be_64(x) rte_bswap64(x)
209 * Convert a 16-bit value from little endian to CPU order.
211 #define rte_le_to_cpu_16(x) (x)
214 * Convert a 32-bit value from little endian to CPU order.
216 #define rte_le_to_cpu_32(x) (x)
219 * Convert a 64-bit value from little endian to CPU order.
221 #define rte_le_to_cpu_64(x) (x)
225 * Convert a 16-bit value from big endian to CPU order.
227 #define rte_be_to_cpu_16(x) rte_bswap16(x)
230 * Convert a 32-bit value from big endian to CPU order.
232 #define rte_be_to_cpu_32(x) rte_bswap32(x)
235 * Convert a 64-bit value from big endian to CPU order.
237 #define rte_be_to_cpu_64(x) rte_bswap64(x)
243 #endif /* _RTE_BYTEORDER_H_ */