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
13 * R5000 and RM5200 implements pref and prefx instructions but they're nops, so
14 * rather than wasting time we pretend these processors don't support
17 * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained,
18 * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore.
20 * Hell (and the book on my shelf I can't open ...) know what the R8000 does.
22 * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements
23 * Pref_PrepareForStore also.
25 * RM9000 is MIPS IV but implements prefetching like MIPS32/MIPS64; it's
26 * Pref_WriteBackInvalidate is a nop and Pref_PrepareForStore is broken in
27 * current versions due to erratum G105.
29 * VR5500 (including VR5701 and VR7701) only implement load prefetch.
31 * Finally MIPS32 and MIPS64 implement all of the following hints.
36 /* 2 and 3 are reserved */
37 #define Pref_LoadStreamed 4
38 #define Pref_StoreStreamed 5
39 #define Pref_LoadRetained 6
40 #define Pref_StoreRetained 7
41 /* 8 ... 24 are reserved */
42 #define Pref_WriteBackInvalidate 25
43 #define Pref_PrepareForStore 30
47 .macro __pref hint addr
48 #ifdef CONFIG_CPU_HAS_PREFETCH
54 __pref Pref_Load, \addr
57 .macro pref_store addr
58 __pref Pref_Store, \addr
61 .macro pref_load_streamed addr
62 __pref Pref_LoadStreamed, \addr
65 .macro pref_store_streamed addr
66 __pref Pref_StoreStreamed, \addr
69 .macro pref_load_retained addr
70 __pref Pref_LoadRetained, \addr
73 .macro pref_store_retained addr
74 __pref Pref_StoreRetained, \addr
77 .macro pref_wback_inv addr
78 __pref Pref_WriteBackInvalidate, \addr
81 .macro pref_prepare_for_store addr
82 __pref Pref_PrepareForStore, \addr
87 #endif /* __ASM_PREFETCH_H */