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prefetch.h

prefetch.h 2.1 KB
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  1. /*
    2. 

  2.  * This file is subject to the terms and conditions of the GNU General Public
    3. 

  3.  * License.  See the file "COPYING" in the main directory of this archive
    4. 

  4.  * for more details.
    5. 

  5.  *
    6. 

  6.  * Copyright (C) 2003 by Ralf Baechle
    7. 

  7.  */
    8. 

  8. #ifndef __ASM_PREFETCH_H
    9. 

  9. #define __ASM_PREFETCH_H
    10. 

  10. 

  11. 

  12. /*
    13. 

  13.  * R5000 and RM5200 implements pref and prefx instructions but they're nops, so
    14. 

  14.  * rather than wasting time we pretend these processors don't support
    15. 

  15.  * prefetching at all.
    16. 

  16.  *
    17. 

  17.  * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained,
    18. 

  18.  * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore.
    19. 

  19.  *
    20. 

  20.  * Hell (and the book on my shelf I can't open ...) know what the R8000 does.
    21. 

  21.  *
    22. 

  22.  * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements
    23. 

  23.  * Pref_PrepareForStore also.
    24. 

  24.  *
    25. 

  25.  * RM9000 is MIPS IV but implements prefetching like MIPS32/MIPS64; it's
    26. 

  26.  * Pref_WriteBackInvalidate is a nop and Pref_PrepareForStore is broken in
    27. 

  27.  * current versions due to erratum G105.
    28. 

  28.  *
    29. 

  29.  * VR5500 (including VR5701 and VR7701) only implement load prefetch.
    30. 

  30.  *
    31. 

  31.  * Finally MIPS32 and MIPS64 implement all of the following hints.
    32. 

  32.  */
    33. 

  33. 

  34. #define Pref_Load			0
    35. 

  35. #define Pref_Store			1
    36. 

  36. 						/* 2 and 3 are reserved */
    37. 

  37. #define Pref_LoadStreamed		4
    38. 

  38. #define Pref_StoreStreamed		5
    39. 

  39. #define Pref_LoadRetained		6
    40. 

  40. #define Pref_StoreRetained		7
    41. 

  41. 						/* 8 ... 24 are reserved */
    42. 

  42. #define Pref_WriteBackInvalidate	25
    43. 

  43. #define Pref_PrepareForStore		30
    44. 

  44. 

  45. #ifdef __ASSEMBLY__
    46. 

  46. 

  47. 	.macro	__pref hint addr
    48. 

  48. #ifdef CONFIG_CPU_HAS_PREFETCH
    49. 

  49. 	pref	\hint, \addr
    50. 

  50. #endif
    51. 

  51. 	.endm
    52. 

  52. 

  53. 	.macro	pref_load addr
    54. 

  54. 	__pref	Pref_Load, \addr
    55. 

  55. 	.endm
    56. 

  56. 

  57. 	.macro	pref_store addr
    58. 

  58. 	__pref	Pref_Store, \addr
    59. 

  59. 	.endm
    60. 

  60. 

  61. 	.macro	pref_load_streamed addr
    62. 

  62. 	__pref	Pref_LoadStreamed, \addr
    63. 

  63. 	.endm
    64. 

  64. 

  65. 	.macro	pref_store_streamed addr
    66. 

  66. 	__pref	Pref_StoreStreamed, \addr
    67. 

  67. 	.endm
    68. 

  68. 

  69. 	.macro	pref_load_retained addr
    70. 

  70. 	__pref	Pref_LoadRetained, \addr
    71. 

  71. 	.endm
    72. 

  72. 

  73. 	.macro	pref_store_retained addr
    74. 

  74. 	__pref	Pref_StoreRetained, \addr
    75. 

  75. 	.endm
    76. 

  76. 

  77. 	.macro	pref_wback_inv addr
    78. 

  78. 	__pref	Pref_WriteBackInvalidate, \addr
    79. 

  79. 	.endm
    80. 

  80. 

  81. 	.macro	pref_prepare_for_store addr
    82. 

  82. 	__pref	Pref_PrepareForStore, \addr
    83. 

  83. 	.endm
    84. 

  84. 

  85. #endif
    86. 

  86. 

  87. #endif /* __ASM_PREFETCH_H */
    88. 

  88.