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 #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 */