1/*
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
4 * for more details.
5 *
6 * Copyright (C) 2003 by Ralf Baechle
7 */
8#ifndef __ASM_PREFETCH_H
9#define __ASM_PREFETCH_H
10
11
12/*
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
15 * prefetching at all.
16 *
17 * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained,
18 * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore.
19 *
20 * Hell (and the book on my shelf I can't open ...) know what the R8000 does.
21 *
22 * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements
23 * Pref_PrepareForStore also.
24 *
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.
28 *
29 * VR5500 (including VR5701 and VR7701) only implement load prefetch.
30 *
31 * Finally MIPS32 and MIPS64 implement all of the following hints.
32 */
33
34#define Pref_Load			0
35#define Pref_Store			1
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
44
45#ifdef __ASSEMBLY__
46
47	.macro	__pref hint addr
48#ifdef CONFIG_CPU_HAS_PREFETCH
49	pref	\hint, \addr
50#endif
51	.endm
52
53	.macro	pref_load addr
54	__pref	Pref_Load, \addr
55	.endm
56
57	.macro	pref_store addr
58	__pref	Pref_Store, \addr
59	.endm
60
61	.macro	pref_load_streamed addr
62	__pref	Pref_LoadStreamed, \addr
63	.endm
64
65	.macro	pref_store_streamed addr
66	__pref	Pref_StoreStreamed, \addr
67	.endm
68
69	.macro	pref_load_retained addr
70	__pref	Pref_LoadRetained, \addr
71	.endm
72
73	.macro	pref_store_retained addr
74	__pref	Pref_StoreRetained, \addr
75	.endm
76
77	.macro	pref_wback_inv addr
78	__pref	Pref_WriteBackInvalidate, \addr
79	.endm
80
81	.macro	pref_prepare_for_store addr
82	__pref	Pref_PrepareForStore, \addr
83	.endm
84
85#endif
86
87#endif /* __ASM_PREFETCH_H */
88