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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RTE_BYTEORDER_H_
#define _RTE_BYTEORDER_H_
/**
* @file
*
* Byte Swap Operations
*
* This file defines a generic API for byte swap operations. Part of
* the implementation is architecture-specific.
*/
#include <stdint.h>
#ifdef RTE_EXEC_ENV_BSDAPP
#include <sys/endian.h>
#else
#include <endian.h>
#endif
#include <rte_common.h>
#include <rte_config.h>
/*
* Compile-time endianness detection
*/
#define RTE_BIG_ENDIAN 1
#define RTE_LITTLE_ENDIAN 2
#if defined __BYTE_ORDER__
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define RTE_BYTE_ORDER RTE_BIG_ENDIAN
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
#endif /* __BYTE_ORDER__ */
#elif defined __BYTE_ORDER
#if __BYTE_ORDER == __BIG_ENDIAN
#define RTE_BYTE_ORDER RTE_BIG_ENDIAN
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
#endif /* __BYTE_ORDER */
#elif defined __BIG_ENDIAN__
#define RTE_BYTE_ORDER RTE_BIG_ENDIAN
#elif defined __LITTLE_ENDIAN__
#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
#endif
#if !defined(RTE_BYTE_ORDER)
#error Unknown endianness.
#endif
#define RTE_STATIC_BSWAP16(v) \
((((uint16_t)(v) & UINT16_C(0x00ff)) << 8) | \
(((uint16_t)(v) & UINT16_C(0xff00)) >> 8))
#define RTE_STATIC_BSWAP32(v) \
((((uint32_t)(v) & UINT32_C(0x000000ff)) << 24) | \
(((uint32_t)(v) & UINT32_C(0x0000ff00)) << 8) | \
(((uint32_t)(v) & UINT32_C(0x00ff0000)) >> 8) | \
(((uint32_t)(v) & UINT32_C(0xff000000)) >> 24))
#define RTE_STATIC_BSWAP64(v) \
((((uint64_t)(v) & UINT64_C(0x00000000000000ff)) << 56) | \
(((uint64_t)(v) & UINT64_C(0x000000000000ff00)) << 40) | \
(((uint64_t)(v) & UINT64_C(0x0000000000ff0000)) << 24) | \
(((uint64_t)(v) & UINT64_C(0x00000000ff000000)) << 8) | \
(((uint64_t)(v) & UINT64_C(0x000000ff00000000)) >> 8) | \
(((uint64_t)(v) & UINT64_C(0x0000ff0000000000)) >> 24) | \
(((uint64_t)(v) & UINT64_C(0x00ff000000000000)) >> 40) | \
(((uint64_t)(v) & UINT64_C(0xff00000000000000)) >> 56))
/*
* These macros are functionally similar to rte_cpu_to_(be|le)(16|32|64)(),
* they take values in host CPU order and return them converted to the
* intended endianness.
*
* They resolve at compilation time to integer constants which can safely be
* used with static initializers, since those cannot involve function calls.
*
* On the other hand, they are not as optimized as their rte_cpu_to_*()
* counterparts, therefore applications should refrain from using them on
* variable values, particularly inside performance-sensitive code.
*/
#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
#define RTE_BE16(v) (rte_be16_t)(v)
#define RTE_BE32(v) (rte_be32_t)(v)
#define RTE_BE64(v) (rte_be64_t)(v)
#define RTE_LE16(v) (rte_le16_t)(RTE_STATIC_BSWAP16(v))
#define RTE_LE32(v) (rte_le32_t)(RTE_STATIC_BSWAP32(v))
#define RTE_LE64(v) (rte_le64_t)(RTE_STATIC_BSWAP64(v))
#elif RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
#define RTE_BE16(v) (rte_be16_t)(RTE_STATIC_BSWAP16(v))
#define RTE_BE32(v) (rte_be32_t)(RTE_STATIC_BSWAP32(v))
#define RTE_BE64(v) (rte_be64_t)(RTE_STATIC_BSWAP64(v))
#define RTE_LE16(v) (rte_be16_t)(v)
#define RTE_LE32(v) (rte_be32_t)(v)
#define RTE_LE64(v) (rte_be64_t)(v)
#else
#error Unsupported endianness.
#endif
/*
* The following types should be used when handling values according to a
* specific byte ordering, which may differ from that of the host CPU.
*
* Libraries, public APIs and applications are encouraged to use them for
* documentation purposes.
*/
typedef uint16_t rte_be16_t; /**< 16-bit big-endian value. */
typedef uint32_t rte_be32_t; /**< 32-bit big-endian value. */
typedef uint64_t rte_be64_t; /**< 64-bit big-endian value. */
typedef uint16_t rte_le16_t; /**< 16-bit little-endian value. */
typedef uint32_t rte_le32_t; /**< 32-bit little-endian value. */
typedef uint64_t rte_le64_t; /**< 64-bit little-endian value. */
/*
* An internal function to swap bytes in a 16-bit value.
*
* It is used by rte_bswap16() when the value is constant. Do not use
* this function directly; rte_bswap16() is preferred.
*/
static inline uint16_t
rte_constant_bswap16(uint16_t x)
{
return RTE_STATIC_BSWAP16(x);
}
/*
* An internal function to swap bytes in a 32-bit value.
*
* It is used by rte_bswap32() when the value is constant. Do not use
* this function directly; rte_bswap32() is preferred.
*/
static inline uint32_t
rte_constant_bswap32(uint32_t x)
{
return RTE_STATIC_BSWAP32(x);
}
/*
* An internal function to swap bytes of a 64-bit value.
*
* It is used by rte_bswap64() when the value is constant. Do not use
* this function directly; rte_bswap64() is preferred.
*/
static inline uint64_t
rte_constant_bswap64(uint64_t x)
{
return RTE_STATIC_BSWAP64(x);
}
#ifdef __DOXYGEN__
/**
* Swap bytes in a 16-bit value.
*/
static uint16_t rte_bswap16(uint16_t _x);
/**
* Swap bytes in a 32-bit value.
*/
static uint32_t rte_bswap32(uint32_t x);
/**
* Swap bytes in a 64-bit value.
*/
static uint64_t rte_bswap64(uint64_t x);
/**
* Convert a 16-bit value from CPU order to little endian.
*/
static rte_le16_t rte_cpu_to_le_16(uint16_t x);
/**
* Convert a 32-bit value from CPU order to little endian.
*/
static rte_le32_t rte_cpu_to_le_32(uint32_t x);
/**
* Convert a 64-bit value from CPU order to little endian.
*/
static rte_le64_t rte_cpu_to_le_64(uint64_t x);
/**
* Convert a 16-bit value from CPU order to big endian.
*/
static rte_be16_t rte_cpu_to_be_16(uint16_t x);
/**
* Convert a 32-bit value from CPU order to big endian.
*/
static rte_be32_t rte_cpu_to_be_32(uint32_t x);
/**
* Convert a 64-bit value from CPU order to big endian.
*/
static rte_be64_t rte_cpu_to_be_64(uint64_t x);
/**
* Convert a 16-bit value from little endian to CPU order.
*/
static uint16_t rte_le_to_cpu_16(rte_le16_t x);
/**
* Convert a 32-bit value from little endian to CPU order.
*/
static uint32_t rte_le_to_cpu_32(rte_le32_t x);
/**
* Convert a 64-bit value from little endian to CPU order.
*/
static uint64_t rte_le_to_cpu_64(rte_le64_t x);
/**
* Convert a 16-bit value from big endian to CPU order.
*/
static uint16_t rte_be_to_cpu_16(rte_be16_t x);
/**
* Convert a 32-bit value from big endian to CPU order.
*/
static uint32_t rte_be_to_cpu_32(rte_be32_t x);
/**
* Convert a 64-bit value from big endian to CPU order.
*/
static uint64_t rte_be_to_cpu_64(rte_be64_t x);
#endif /* __DOXYGEN__ */
#ifdef RTE_FORCE_INTRINSICS
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
#define rte_bswap16(x) __builtin_bswap16(x)
#endif
#define rte_bswap32(x) __builtin_bswap32(x)
#define rte_bswap64(x) __builtin_bswap64(x)
#endif
#endif /* _RTE_BYTEORDER_H_ */
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