2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2003 by Ralf Baechle
8 #ifndef __ASM_PREFETCH_H
9 #define __ASM_PREFETCH_H
11 #include <linux/config.h>
14 * R5000 and RM5200 implements pref and prefx instructions but they're nops, so
15 * rather than wasting time we pretend these processors don't support
18 * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained,
19 * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore.
21 * Hell (and the book on my shelf I can't open ...) know what the R8000 does.
23 * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements
24 * Pref_PrepareForStore also.
26 * RM9000 is MIPS IV but implements prefetching like MIPS32/MIPS64; it's
27 * Pref_WriteBackInvalidate is a nop and Pref_PrepareForStore is broken in
28 * current versions due to erratum G105.
30 * VR7701 only implements the Load prefetch.
32 * Finally MIPS32 and MIPS64 implement all of the following hints.
37 /* 2 and 3 are reserved */
38 #define Pref_LoadStreamed 4
39 #define Pref_StoreStreamed 5
40 #define Pref_LoadRetained 6
41 #define Pref_StoreRetained 7
42 /* 8 ... 24 are reserved */
43 #define Pref_WriteBackInvalidate 25
44 #define Pref_PrepareForStore 30
48 .macro __pref hint addr
49 #ifdef CONFIG_CPU_HAS_PREFETCH
55 __pref Pref_Load, \addr
58 .macro pref_store addr
59 __pref Pref_Store, \addr
62 .macro pref_load_streamed addr
63 __pref Pref_LoadStreamed, \addr
66 .macro pref_store_streamed addr
67 __pref Pref_StoreStreamed, \addr
70 .macro pref_load_retained addr
71 __pref Pref_LoadRetained, \addr
74 .macro pref_store_retained addr
75 __pref Pref_StoreRetained, \addr
78 .macro pref_wback_inv addr
79 __pref Pref_WriteBackInvalidate, \addr
82 .macro pref_prepare_for_store addr
83 __pref Pref_PrepareForStore, \addr
88 #endif /* __ASM_PREFETCH_H */