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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29.  /** @addtogroup genarchmm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. /*
  36.  * This is the generic 4-level page table interface.
  37.  * Architectures that use hierarchical page tables
  38.  * are supposed to implement *_ARCH macros.
  39.  */
  40.  
  41. #ifdef CONFIG_PAGE_PT
  42.  
  43. #ifndef __PAGE_PT_H__
  44. #define __PAGE_PT_H__
  45.  
  46. #include <arch/types.h>
  47. #include <typedefs.h>
  48. #include <mm/page.h>
  49.  
  50. /*
  51.  * Number of entries in each level.
  52.  */
  53. #define PTL0_ENTRIES            PTL0_ENTRIES_ARCH
  54. #define PTL1_ENTRIES            PTL1_ENTRIES_ARCH
  55. #define PTL2_ENTRIES            PTL2_ENTRIES_ARCH
  56. #define PTL3_ENTRIES            PTL3_ENTRIES_ARCH
  57.  
  58. /*
  59.  * These macros process vaddr and extract those portions
  60.  * of it that function as indices to respective page tables.
  61.  */
  62. #define PTL0_INDEX(vaddr)       PTL0_INDEX_ARCH(vaddr)
  63. #define PTL1_INDEX(vaddr)       PTL1_INDEX_ARCH(vaddr)
  64. #define PTL2_INDEX(vaddr)       PTL2_INDEX_ARCH(vaddr)
  65. #define PTL3_INDEX(vaddr)       PTL3_INDEX_ARCH(vaddr)
  66.  
  67. #define SET_PTL0_ADDRESS(ptl0)      SET_PTL0_ADDRESS_ARCH(ptl0)
  68.  
  69. /*
  70.  * These macros traverse the 4-level tree of page tables,
  71.  * each descending by one level.
  72.  */
  73. #define GET_PTL1_ADDRESS(ptl0, i)   GET_PTL1_ADDRESS_ARCH(ptl0, i)
  74. #define GET_PTL2_ADDRESS(ptl1, i)   GET_PTL2_ADDRESS_ARCH(ptl1, i)
  75. #define GET_PTL3_ADDRESS(ptl2, i)   GET_PTL3_ADDRESS_ARCH(ptl2, i)
  76. #define GET_FRAME_ADDRESS(ptl3, i)  GET_FRAME_ADDRESS_ARCH(ptl3, i)
  77.  
  78. /*
  79.  * These macros are provided to change shape of the 4-level
  80.  * tree of page tables on respective level.
  81.  */
  82. #define SET_PTL1_ADDRESS(ptl0, i, a)    SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
  83. #define SET_PTL2_ADDRESS(ptl1, i, a)    SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  84. #define SET_PTL3_ADDRESS(ptl2, i, a)    SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  85. #define SET_FRAME_ADDRESS(ptl3, i, a)   SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
  86.  
  87. /*
  88.  * These macros are provided to query various flags within the page tables.
  89.  */
  90. #define GET_PTL1_FLAGS(ptl0, i)     GET_PTL1_FLAGS_ARCH(ptl0, i)
  91. #define GET_PTL2_FLAGS(ptl1, i)     GET_PTL2_FLAGS_ARCH(ptl1, i)
  92. #define GET_PTL3_FLAGS(ptl2, i)     GET_PTL3_FLAGS_ARCH(ptl2, i)
  93. #define GET_FRAME_FLAGS(ptl3, i)    GET_FRAME_FLAGS_ARCH(ptl3, i)
  94.  
  95. /*
  96.  * These macros are provided to set/clear various flags within the page tables.
  97.  */
  98. #define SET_PTL1_FLAGS(ptl0, i, x)  SET_PTL1_FLAGS_ARCH(ptl0, i, x)
  99. #define SET_PTL2_FLAGS(ptl1, i, x)  SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  100. #define SET_PTL3_FLAGS(ptl2, i, x)  SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  101. #define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x)
  102.  
  103. #define PTE_VALID(p)        PTE_VALID_ARCH((p))
  104. #define PTE_PRESENT(p)      PTE_PRESENT_ARCH((p))
  105. #define PTE_GET_FRAME(p)    PTE_GET_FRAME_ARCH((p))
  106. #define PTE_READABLE(p)     1
  107. #define PTE_WRITABLE(p)     PTE_WRITABLE_ARCH((p))
  108. #define PTE_EXECUTABLE(p)   PTE_EXECUTABLE_ARCH((p))
  109.  
  110. extern page_mapping_operations_t pt_mapping_operations;
  111.  
  112. extern void page_mapping_insert_pt(as_t *as, __address page, __address frame, int flags);
  113. extern pte_t *page_mapping_find_pt(as_t *as, __address page);
  114.  
  115. #endif
  116.  
  117. #endif
  118.  
  119.  /** @}
  120.  */
  121.  
  122.