include/asm-mips/prefetch.h

   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  * VR7701 only implements the 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 */