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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 KERN_PAGE_PT_H_
  44. #define KERN_PAGE_PT_H_
  45.  
  46. #include <arch/types.h>
  47. #include <mm/as.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. /* Table sizes in each level */
  59. #define PTL0_SIZE           PTL0_SIZE_ARCH
  60. #define PTL1_SIZE           PTL1_SIZE_ARCH
  61. #define PTL2_SIZE           PTL2_SIZE_ARCH
  62. #define PTL3_SIZE           PTL3_SIZE_ARCH
  63.  
  64. /*
  65.  * These macros process vaddr and extract those portions
  66.  * of it that function as indices to respective page tables.
  67.  */
  68. #define PTL0_INDEX(vaddr)       PTL0_INDEX_ARCH(vaddr)
  69. #define PTL1_INDEX(vaddr)       PTL1_INDEX_ARCH(vaddr)
  70. #define PTL2_INDEX(vaddr)       PTL2_INDEX_ARCH(vaddr)
  71. #define PTL3_INDEX(vaddr)       PTL3_INDEX_ARCH(vaddr)
  72.  
  73. #define SET_PTL0_ADDRESS(ptl0)      SET_PTL0_ADDRESS_ARCH(ptl0)
  74.  
  75. /*
  76.  * These macros traverse the 4-level tree of page tables,
  77.  * each descending by one level.
  78.  */
  79. #define GET_PTL1_ADDRESS(ptl0, i)   GET_PTL1_ADDRESS_ARCH(ptl0, i)
  80. #define GET_PTL2_ADDRESS(ptl1, i)   GET_PTL2_ADDRESS_ARCH(ptl1, i)
  81. #define GET_PTL3_ADDRESS(ptl2, i)   GET_PTL3_ADDRESS_ARCH(ptl2, i)
  82. #define GET_FRAME_ADDRESS(ptl3, i)  GET_FRAME_ADDRESS_ARCH(ptl3, i)
  83.  
  84. /*
  85.  * These macros are provided to change the shape of the 4-level tree of page
  86.  * tables on respective level.
  87.  */
  88. #define SET_PTL1_ADDRESS(ptl0, i, a)    SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
  89. #define SET_PTL2_ADDRESS(ptl1, i, a)    SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  90. #define SET_PTL3_ADDRESS(ptl2, i, a)    SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  91. #define SET_FRAME_ADDRESS(ptl3, i, a)   SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
  92.  
  93. /*
  94.  * These macros are provided to query various flags within the page tables.
  95.  */
  96. #define GET_PTL1_FLAGS(ptl0, i)     GET_PTL1_FLAGS_ARCH(ptl0, i)
  97. #define GET_PTL2_FLAGS(ptl1, i)     GET_PTL2_FLAGS_ARCH(ptl1, i)
  98. #define GET_PTL3_FLAGS(ptl2, i)     GET_PTL3_FLAGS_ARCH(ptl2, i)
  99. #define GET_FRAME_FLAGS(ptl3, i)    GET_FRAME_FLAGS_ARCH(ptl3, i)
  100.  
  101. /*
  102.  * These macros are provided to set/clear various flags within the page tables.
  103.  */
  104. #define SET_PTL1_FLAGS(ptl0, i, x)  SET_PTL1_FLAGS_ARCH(ptl0, i, x)
  105. #define SET_PTL2_FLAGS(ptl1, i, x)  SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  106. #define SET_PTL3_FLAGS(ptl2, i, x)  SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  107. #define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x)
  108.  
  109. /*
  110.  * Macros for querying the last-level PTEs.
  111.  */
  112. #define PTE_VALID(p)        PTE_VALID_ARCH((p))
  113. #define PTE_PRESENT(p)      PTE_PRESENT_ARCH((p))
  114. #define PTE_GET_FRAME(p)    PTE_GET_FRAME_ARCH((p))
  115. #define PTE_READABLE(p)     1
  116. #define PTE_WRITABLE(p)     PTE_WRITABLE_ARCH((p))
  117. #define PTE_EXECUTABLE(p)   PTE_EXECUTABLE_ARCH((p))
  118.  
  119. extern as_operations_t as_pt_operations;
  120. extern page_mapping_operations_t pt_mapping_operations;
  121.  
  122. extern void page_mapping_insert_pt(as_t *as, uintptr_t page, uintptr_t frame,
  123.     int flags);
  124. extern pte_t *page_mapping_find_pt(as_t *as, uintptr_t page);
  125.  
  126. #endif
  127.  
  128. #endif
  129.  
  130. /** @}
  131.  */
  132.