X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=kitten%2Finclude%2Flwk%2Fprefetch.h;fp=kitten%2Finclude%2Flwk%2Fprefetch.h;h=4be04454eac9b96f029cae0cc669f8acb2802568;hb=66a1a4c7a9edcd7d8bc207aca093d694a6e6b5b2;hp=0000000000000000000000000000000000000000;hpb=f7cf9c19ecb0a589dd45ae0d2c91814bd3c2acc2;p=palacios.git

diff --git a/kitten/include/lwk/prefetch.h b/kitten/include/lwk/prefetch.h
new file mode 100644
index 0000000..4be0445
--- /dev/null
+++ b/kitten/include/lwk/prefetch.h
@@ -0,0 +1,69 @@
+/*
+ *  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 _LWK_PREFETCH_H
+#define _LWK_PREFETCH_H
+
+#include <lwk/types.h>
+#include <arch/processor.h>
+#include <arch/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
+static inline void prefetch(const void *x) {;}
+#endif
+
+#ifndef ARCH_HAS_PREFETCHW
+static inline void prefetchw(const void *x) {;}
+#endif
+
+#ifndef ARCH_HAS_SPINLOCK_PREFETCH
+#define spin_lock_prefetch(x) prefetchw(x)
+#endif
+
+#ifndef PREFETCH_STRIDE
+#define PREFETCH_STRIDE (4*L1_CACHE_BYTES)
+#endif
+
+static inline void prefetch_range(void *addr, size_t len)
+{
+#ifdef ARCH_HAS_PREFETCH
+	char *cp;
+	char *end = addr + len;
+
+	for (cp = addr; cp < end; cp += PREFETCH_STRIDE)
+		prefetch(cp);
+#endif
+}
+
+#endif