ceph/src/spdk/dpdk/lib/librte_eal/common/include/generic/rte_prefetch.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2015 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_PREFETCH_H_
   6 #define _RTE_PREFETCH_H_
   7
   8 /**
   9  * @file
  10  *
  11  * Prefetch operations.
  12  *
  13  * This file defines an API for prefetch macros / inline-functions,
  14  * which are architecture-dependent. Prefetching occurs when a
  15  * processor requests an instruction or data from memory to cache
  16  * before it is actually needed, potentially speeding up the execution of the
  17  * program.
  18  */
  19
  20 /**
  21  * Prefetch a cache line into all cache levels.
  22  * @param p
  23  *   Address to prefetch
  24  */
  25 static inline void rte_prefetch0(const volatile void *p);
  26
  27 /**
  28  * Prefetch a cache line into all cache levels except the 0th cache level.
  29  * @param p
  30  *   Address to prefetch
  31  */
  32 static inline void rte_prefetch1(const volatile void *p);
  33
  34 /**
  35  * Prefetch a cache line into all cache levels except the 0th and 1th cache
  36  * levels.
  37  * @param p
  38  *   Address to prefetch
  39  */
  40 static inline void rte_prefetch2(const volatile void *p);
  41
  42 /**
  43  * Prefetch a cache line into all cache levels (non-temporal/transient version)
  44  *
  45  * The non-temporal prefetch is intended as a prefetch hint that processor will
  46  * use the prefetched data only once or short period, unlike the
  47  * rte_prefetch0() function which imply that prefetched data to use repeatedly.
  48  *
  49  * @param p
  50  *   Address to prefetch
  51  */
  52 static inline void rte_prefetch_non_temporal(const volatile void *p);
  53
  54 #endif /* _RTE_PREFETCH_H_ */