| /* |
| * 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 |
| |
| #include <linux/config.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. |
| * |
| * VR7701 only implements the 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 */ |
