[ceph.git] / ceph / src / dpdk / lib / librte_eal / common / include / generic / rte_prefetch.h

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2015 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_PREFETCH_H_
#define _RTE_PREFETCH_H_

/**
 * @file
 *
 * Prefetch operations.
 *
 * This file defines an API for prefetch macros / inline-functions,
 * which are architecture-dependent. Prefetching occurs when a
 * processor requests an instruction or data from memory to cache
 * before it is actually needed, potentially speeding up the execution of the
 * program.
 */

/**
 * Prefetch a cache line into all cache levels.
 * @param p
 *   Address to prefetch
 */
static inline void rte_prefetch0(const volatile void *p);

/**
 * Prefetch a cache line into all cache levels except the 0th cache level.
 * @param p
 *   Address to prefetch
 */
static inline void rte_prefetch1(const volatile void *p);

/**
 * Prefetch a cache line into all cache levels except the 0th and 1th cache
 * levels.
 * @param p
 *   Address to prefetch
 */
static inline void rte_prefetch2(const volatile void *p);

/**
 * Prefetch a cache line into all cache levels (non-temporal/transient version)
 *
 * The non-temporal prefetch is intended as a prefetch hint that processor will
 * use the prefetched data only once or short period, unlike the
 * rte_prefetch0() function which imply that prefetched data to use repeatedly.
 *
 * @param p
 *   Address to prefetch
 */
static inline void rte_prefetch_non_temporal(const volatile void *p);

#endif /* _RTE_PREFETCH_H_ */
Commit	Line	Data
7c673cae FG	1	/*-
	2	* BSD LICENSE
	3	*
	4	* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* * Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* * Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in
	15	* the documentation and/or other materials provided with the
	16	* distribution.
	17	* * Neither the name of Intel Corporation nor the names of its
	18	* contributors may be used to endorse or promote products derived
	19	* from this software without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	22	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	23	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	24	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	25	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	26	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	27	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	28	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	29	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	30	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	31	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	32	*/
	33
	34	#ifndef _RTE_PREFETCH_H_
	35	#define _RTE_PREFETCH_H_
	36
	37	/**
	38	* @file
	39	*
	40	* Prefetch operations.
	41	*
	42	* This file defines an API for prefetch macros / inline-functions,
	43	* which are architecture-dependent. Prefetching occurs when a
	44	* processor requests an instruction or data from memory to cache
	45	* before it is actually needed, potentially speeding up the execution of the
	46	* program.
	47	*/
	48
	49	/**
	50	* Prefetch a cache line into all cache levels.
	51	* @param p
	52	* Address to prefetch
	53	*/
	54	static inline void rte_prefetch0(const volatile void *p);
	55
	56	/**
	57	* Prefetch a cache line into all cache levels except the 0th cache level.
	58	* @param p
	59	* Address to prefetch
	60	*/
	61	static inline void rte_prefetch1(const volatile void *p);
	62
	63	/**
	64	* Prefetch a cache line into all cache levels except the 0th and 1th cache
65	* levels.
66	* @param p
67	* Address to prefetch
68	*/
69	static inline void rte_prefetch2(const volatile void *p);
70
71	/**
72	* Prefetch a cache line into all cache levels (non-temporal/transient version)
73	*
74	* The non-temporal prefetch is intended as a prefetch hint that processor will
75	* use the prefetched data only once or short period, unlike the
76	* rte_prefetch0() function which imply that prefetched data to use repeatedly.
77	*
78	* @param p
79	* Address to prefetch
80	*/
81	static inline void rte_prefetch_non_temporal(const volatile void *p);
82
83	#endif /* _RTE_PREFETCH_H_ */