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  1. /*
  2.  * Copyright (C) 2001-2004 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. #ifndef __PAGE_H__
  30. #define __PAGE_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34.  
  35. #define PAGE_CACHEABLE_SHIFT        0
  36. #define PAGE_NOT_CACHEABLE_SHIFT    PAGE_CACHEABLE_SHIFT
  37. #define PAGE_PRESENT_SHIFT      1
  38. #define PAGE_NOT_PRESENT_SHIFT      PAGE_PRESENT_SHIFT
  39. #define PAGE_USER_SHIFT         2
  40. #define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
  41. #define PAGE_READ_SHIFT         3
  42. #define PAGE_WRITE_SHIFT        4
  43. #define PAGE_EXEC_SHIFT         5
  44.  
  45. #define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)
  46. #define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)
  47.  
  48. #define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)
  49. #define PAGE_NOT_PRESENT    (1<<PAGE_PRESENT_SHIFT)
  50.  
  51. #define PAGE_USER       (1<<PAGE_USER_SHIFT)
  52. #define PAGE_KERNEL     (0<<PAGE_USER_SHIFT)
  53.  
  54. #define PAGE_READ       (1<<PAGE_READ_SHIFT)
  55. #define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
  56. #define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
  57.  
  58. /*
  59.  * This is the generic 4-level page table interface.
  60.  * Architectures are supposed to implement *_ARCH macros.
  61.  */
  62.  
  63. /*
  64.  * These macros process vaddr and extract those portions
  65.  * of it that function as indices to respective page tables.
  66.  */
  67. #define PTL0_INDEX(vaddr)       PTL0_INDEX_ARCH(vaddr)
  68. #define PTL1_INDEX(vaddr)       PTL1_INDEX_ARCH(vaddr)
  69. #define PTL2_INDEX(vaddr)       PTL2_INDEX_ARCH(vaddr)
  70. #define PTL3_INDEX(vaddr)       PTL3_INDEX_ARCH(vaddr)
  71.  
  72. #define GET_PTL0_ADDRESS()      GET_PTL0_ADDRESS_ARCH()
  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 shape of the 4-level
  86.  * tree of page 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. extern void page_init(void);
  110. extern void map_page_to_frame(__address page, __address frame, int flags, __address root);
  111. extern void map_structure(__address s, size_t size);
  112.  
  113. #endif
  114.