bitkeeper revision 1.821 (406007d6uu0vZYDxa9P1ZfNO9kF_Cg)

Many files:
  xeno -> xen renames.
ide-xen.c:
  Rename: xen/drivers/ide/ide-xeno.c -> xen/drivers/ide/ide-xen.c
xen.lds:
  Rename: xen/arch/i386/xeno.lds -> xen/arch/i386/xen.lds
Many files:
  mvdir

1 files changed, 60 insertions, 0 deletions

diff --git a/xen/include/xen/prefetch.h b/xen/include/xen/prefetch.h
new file mode 100644
index 0000000000..8d7d3ffeb4
--- /dev/null
+++ b/xen/include/xen/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