patch-2.4.25 linux-2.4.25/include/asm-mips/prefetch.h

• Lines: 44
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/include/asm-mips/prefetch.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/include/asm-mips/prefetch.h linux-2.4.25/include/asm-mips/prefetch.h
@@ -0,0 +1,43 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003 by Ralf Baechle
+ */
+#ifndef __ASM_PREFETCH_H
+#define __ASM_PREFETCH_H
+
+/*
+ * R5000 and RM5200 implements pref and prefx instructions but they're nops, so
+ * rather than wasting time we pretend these processors don't support
+ * prefetching at all.
+ *
+ * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained,
+ * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore.
+ *
+ * Hell (and the book on my shelf I can't open ...) know what the R8000 does.
+ *
+ * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements
+ * Pref_PrepareForStore also.
+ *
+ * RM9000 is MIPS IV but implements prefetching like MIPS32/MIPS64;
+ * it's Pref_WriteBackInvalidate is a nop.
+ *
+ * VR7701 only implements the Load prefetch.
+ *
+ * Finally MIPS32 and MIPS64 implement all of the following hints.
+ */
+
+#define Pref_Load			0
+#define Pref_Store			1
+						/* 2 and 3 are reserved */
+#define Pref_LoadStreamed		4
+#define Pref_StoreStreamed		5
+#define Pref_LoadRetained		6
+#define Pref_StoreRetained		7
+						/* 8 ... 24 are reserved */
+#define Pref_WriteBackInvalidate	25
+#define Pref_PrepareForStore		30
+
+#endif /* __ASM_PREFETCH_H */