62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
#pragma once
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#include <stdint.h>
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#define rte_cpu_to_be_16(x) rte_bswap16(x)
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#define rte_be_to_cpu_16(x) rte_bswap16(x)
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#define rte_cpu_to_be_32(x) rte_bswap32(x)
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#define rte_be_to_cpu_32(x) rte_bswap32(x)
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#define rte_bswap16(x) \
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((uint16_t)(__builtin_constant_p(x) ? rte_constant_bswap16(x) \
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: rte_arch_bswap16(x)))
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#define rte_bswap32(x) \
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((uint32_t)(__builtin_constant_p(x) ? rte_constant_bswap32(x) \
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: rte_arch_bswap32(x)))
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typedef uint16_t rte_be16_t;
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typedef uint32_t rte_be32_t;
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/**
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* An internal function to swap bytes in a
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* 16-bit value.
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*
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* It is used by rte_bswap16() when the
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* value is constant. Do not use this
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* function directly; rte_bswap16() is
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* preferred.
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*/
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static inline uint16_t rte_constant_bswap16(uint16_t x) {
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return (uint16_t)(((x & 0x00ffU) << 8) | ((x & 0xff00U) >> 8));
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}
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/**
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* An internal function to swap bytes in a 32-bit value.
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*
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* It is used by rte_bswap32() when the value is constant. Do not use
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* this function directly; rte_bswap32() is preferred.
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*/
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static inline uint32_t rte_constant_bswap32(uint32_t x) {
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return ((x & 0x000000ffUL) << 24) | ((x & 0x0000ff00UL) << 8) |
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((x & 0x00ff0000UL) >> 8) | ((x & 0xff000000UL) >> 24);
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}
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static inline uint16_t rte_arch_bswap16(uint16_t _x) {
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uint16_t x = _x;
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asm volatile("xchgb %b[x1],%h[x2]" : [ x1 ] "=Q"(x) : [ x2 ] "0"(x));
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return x;
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}
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/*
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* An architecture-optimized byte swap for a 32-bit value.
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*
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* Do not use this function directly. The preferred function is rte_bswap32().
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*/
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static inline uint32_t rte_arch_bswap32(uint32_t _x) {
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uint32_t x = _x;
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asm volatile("bswap %[x]" : [ x ] "+r"(x));
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return x;
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} |