/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2003 by Ralf Baechle */ #ifndef __ASM_PREFETCH_H #define __ASM_PREFETCH_H /* * R5000 and RM5200 implements pref and prefx instructions but they're nops, so * rather than wasting time we pretend these processors don't support * prefetching at all. * * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained, * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore. * * Hell (and the book on my shelf I can't open ...) know what the R8000 does. * * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements * Pref_PrepareForStore also. * * RM9000 is MIPS IV but implements prefetching like MIPS32/MIPS64; it's * Pref_WriteBackInvalidate is a nop and Pref_PrepareForStore is broken in * current versions due to erratum G105. * * VR5500 (including VR5701 and VR7701) only implement load prefetch. * * Finally MIPS32 and MIPS64 implement all of the following hints. */ #define Pref_Load 0 #define Pref_Store 1 /* 2 and 3 are reserved */ #define Pref_LoadStreamed 4 #define Pref_StoreStreamed 5 #define Pref_LoadRetained 6 #define Pref_StoreRetained 7 /* 8 ... 24 are reserved */ #define Pref_WriteBackInvalidate 25 #define Pref_PrepareForStore 30 #ifdef __ASSEMBLY__ .macro __pref hint addr #ifdef CONFIG_CPU_HAS_PREFETCH pref \hint, \addr #endif .endm .macro pref_load addr __pref Pref_Load, \addr .endm .macro pref_store addr __pref Pref_Store, \addr .endm .macro pref_load_streamed addr __pref Pref_LoadStreamed, \addr .endm .macro pref_store_streamed addr __pref Pref_StoreStreamed, \addr .endm .macro pref_load_retained addr __pref Pref_LoadRetained, \addr .endm .macro pref_store_retained addr __pref Pref_StoreRetained, \addr .endm .macro pref_wback_inv addr __pref Pref_WriteBackInvalidate, \addr .endm .macro pref_prepare_for_store addr __pref Pref_PrepareForStore, \addr .endm #endif #endif /* __ASM_PREFETCH_H */