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