90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/*******************************************************************************
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Copyright (c) 2009-2018, Intel Corporation
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************/
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/**
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* Header file with CRC external definitions
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*
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*/
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#ifndef __CRCEXT_H__
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#define __CRCEXT_H__
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#include <x86intrin.h>
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#include "types.h"
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/**
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* Flag indicating availability of PCLMULQDQ instruction
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* Only valid after running CRCInit() function.
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*/
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extern int pclmulqdq_available;
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/**
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* Flag indicating availability of PCLMULQDQ instruction
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* Only valid after running CRCInit() function.
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*/
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extern __m128i crc_xmm_be_le_swap128;
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extern const uint8_t crc_xmm_shift_tab[48];
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/**
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* @brief Shifts right 128 bit register by specified number of bytes
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*
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* @param reg 128 bit value
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* @param num number of bytes to shift right \a reg by (0-16)
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*
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* @return \a reg >> (\a num * 8)
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*/
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__forceinline
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__m128i xmm_shift_right(__m128i reg, const unsigned int num)
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{
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const __m128i *p = (const __m128i *)(crc_xmm_shift_tab + 16 + num);
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return _mm_shuffle_epi8(reg, _mm_loadu_si128(p));
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}
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/**
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* @brief Shifts left 128 bit register by specified number of bytes
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*
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* @param reg 128 bit value
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* @param num number of bytes to shift left \a reg by (0-16)
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*
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* @return \a reg << (\a num * 8)
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*/
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__forceinline
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__m128i xmm_shift_left(__m128i reg, const unsigned int num)
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{
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const __m128i *p = (const __m128i *)(crc_xmm_shift_tab + 16 - num);
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return _mm_shuffle_epi8(reg, _mm_loadu_si128(p));
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}
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/**
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* @brief Initializes CRC module.
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* @note It is mandatory to run it before using any of CRC API's.
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*/
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extern void CRCInit(void);
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#endif /* __CRCEXT_H__ */
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