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TOMOYO Linux Cross Reference
Linux/include/linux/prefetch.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *  Generic cache management functions. Everything is arch-specific,  
  4  *  but this header exists to make sure the defines/functions can be
  5  *  used in a generic way.
  6  *
  7  *  2000-11-13  Arjan van de Ven   <arjan@fenrus.demon.nl>
  8  *
  9  */
 10 
 11 #ifndef _LINUX_PREFETCH_H
 12 #define _LINUX_PREFETCH_H
 13 
 14 #include <linux/types.h>
 15 #include <asm/processor.h>
 16 #include <asm/cache.h>
 17 
 18 /*
 19         prefetch(x) attempts to pre-emptively get the memory pointed to
 20         by address "x" into the CPU L1 cache. 
 21         prefetch(x) should not cause any kind of exception, prefetch(0) is
 22         specifically ok.
 23 
 24         prefetch() should be defined by the architecture, if not, the 
 25         #define below provides a no-op define.  
 26         
 27         There are 3 prefetch() macros:
 28         
 29         prefetch(x)     - prefetches the cacheline at "x" for read
 30         prefetchw(x)    - prefetches the cacheline at "x" for write
 31         spin_lock_prefetch(x) - prefetches the spinlock *x for taking
 32         
 33         there is also PREFETCH_STRIDE which is the architecure-preferred 
 34         "lookahead" size for prefetching streamed operations.
 35         
 36 */
 37 
 38 #ifndef ARCH_HAS_PREFETCH
 39 #define prefetch(x) __builtin_prefetch(x)
 40 #endif
 41 
 42 #ifndef ARCH_HAS_PREFETCHW
 43 #define prefetchw(x) __builtin_prefetch(x,1)
 44 #endif
 45 
 46 #ifndef ARCH_HAS_SPINLOCK_PREFETCH
 47 #define spin_lock_prefetch(x) prefetchw(x)
 48 #endif
 49 
 50 #ifndef PREFETCH_STRIDE
 51 #define PREFETCH_STRIDE (4*L1_CACHE_BYTES)
 52 #endif
 53 
 54 static inline void prefetch_range(void *addr, size_t len)
 55 {
 56 #ifdef ARCH_HAS_PREFETCH
 57         char *cp;
 58         char *end = addr + len;
 59 
 60         for (cp = addr; cp < end; cp += PREFETCH_STRIDE)
 61                 prefetch(cp);
 62 #endif
 63 }
 64 
 65 #endif
 66 

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