patch-2.4.10 linux/include/linux/prefetch.h

• Lines: 61
• Date: Sun Sep 23 10:31:02 2001
• Orig file: v2.4.9/linux/include/linux/prefetch.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/include/linux/prefetch.h linux/include/linux/prefetch.h
@@ -0,0 +1,60 @@
+/*
+ *  Generic cache management functions. Everything is arch-specific,  
+ *  but this header exists to make sure the defines/functions can be
+ *  used in a generic way.
+ *
+ *  2000-11-13  Arjan van de Ven   <arjan@fenrus.demon.nl>
+ *
+ */
+
+#ifndef _LINUX_PREFETCH_H
+#define _LINUX_PREFETCH_H
+
+#include <asm/processor.h>
+#include <asm/cache.h>
+
+/*
+	prefetch(x) attempts to pre-emptively get the memory pointed to
+	by address "x" into the CPU L1 cache. 
+	prefetch(x) should not cause any kind of exception, prefetch(0) is
+	specifically ok.
+
+	prefetch() should be defined by the architecture, if not, the 
+	#define below provides a no-op define.	
+	
+	There are 3 prefetch() macros:
+	
+	prefetch(x)  	- prefetches the cacheline at "x" for read
+	prefetchw(x)	- prefetches the cacheline at "x" for write
+	spin_lock_prefetch(x) - prefectches the spinlock *x for taking
+	
+	there is also PREFETCH_STRIDE which is the architecure-prefered 
+	"lookahead" size for prefetching streamed operations.
+	
+*/
+
+/*
+ *	These cannot be do{}while(0) macros. See the mental gymnastics in
+ *	the loop macro.
+ */
+ 
+#ifndef ARCH_HAS_PREFETCH
+#define ARCH_HAS_PREFETCH
+static inline void prefetch(const void *x) {;}
+#endif
+
+#ifndef ARCH_HAS_PREFETCHW
+#define ARCH_HAS_PREFETCHW
+static inline void prefetchw(const void *x) {;}
+#endif
+
+#ifndef ARCH_HAS_SPINLOCK_PREFETCH
+#define ARCH_HAS_SPINLOCK_PREFETCH
+#define spin_lock_prefetch(x) prefetchw(x)
+#endif
+
+#ifndef PREFETCH_STRIDE
+#define PREFETCH_STRIDE (4*L1_CACHE_BYTES)
+#endif
+
+#endif