| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #include <linux/config.h> |
| 12 | |
| 13 | /* |
| 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 |
| 16 | * prefetching at all. |
| 17 | * |
| 18 | * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained, |
| 19 | * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore. |
| 20 | * |
| 21 | * Hell (and the book on my shelf I can't open ...) know what the R8000 does. |
| 22 | * |
| 23 | * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements |
| 24 | * Pref_PrepareForStore also. |
| 25 | * |
| 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. |
| 29 | * |
| 30 | * VR7701 only implements the Load prefetch. |
| 31 | * |
| 32 | * Finally MIPS32 and MIPS64 implement all of the following hints. |
| 33 | */ |
| 34 | |
| 35 | #define Pref_Load 0 |
| 36 | #define Pref_Store 1 |
| 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 |
| 45 | |
| 46 | #ifdef __ASSEMBLY__ |
| 47 | |
| 48 | .macro __pref hint addr |
| 49 | #ifdef CONFIG_CPU_HAS_PREFETCH |
| 50 | pref \hint, \addr |
| 51 | #endif |
| 52 | .endm |
| 53 | |
| 54 | .macro pref_load addr |
| 55 | __pref Pref_Load, \addr |
| 56 | .endm |
| 57 | |
| 58 | .macro pref_store addr |
| 59 | __pref Pref_Store, \addr |
| 60 | .endm |
| 61 | |
| 62 | .macro pref_load_streamed addr |
| 63 | __pref Pref_LoadStreamed, \addr |
| 64 | .endm |
| 65 | |
| 66 | .macro pref_store_streamed addr |
| 67 | __pref Pref_StoreStreamed, \addr |
| 68 | .endm |
| 69 | |
| 70 | .macro pref_load_retained addr |
| 71 | __pref Pref_LoadRetained, \addr |
| 72 | .endm |
| 73 | |
| 74 | .macro pref_store_retained addr |
| 75 | __pref Pref_StoreRetained, \addr |
| 76 | .endm |
| 77 | |
| 78 | .macro pref_wback_inv addr |
| 79 | __pref Pref_WriteBackInvalidate, \addr |
| 80 | .endm |
| 81 | |
| 82 | .macro pref_prepare_for_store addr |
| 83 | __pref Pref_PrepareForStore, \addr |
| 84 | .endm |
| 85 | |
| 86 | #endif |
| 87 | |
| 88 | #endif /* __ASM_PREFETCH_H */ |