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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. /** @addtogroup ia32mm 
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ia32_PAGE_H_
  36. #define KERN_ia32_PAGE_H_
  37.  
  38. #include <arch/mm/frame.h>
  39.  
  40. #define PAGE_WIDTH  FRAME_WIDTH
  41. #define PAGE_SIZE   FRAME_SIZE
  42.  
  43. #ifdef KERNEL
  44.  
  45. #ifndef __ASM__
  46. #   define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
  47. #   define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
  48. #else
  49. #   define KA2PA(x) ((x) - 0x80000000)
  50. #   define PA2KA(x) ((x) + 0x80000000)
  51. #endif
  52.  
  53. /*
  54.  * Implementation of generic 4-level page table interface.
  55.  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  56.  */
  57.  
  58. /* Number of entries in each level. */
  59. #define PTL0_ENTRIES_ARCH   1024
  60. #define PTL1_ENTRIES_ARCH   0
  61. #define PTL2_ENTRIES_ARCH   0
  62. #define PTL3_ENTRIES_ARCH   1024
  63.  
  64. /* Page table sizes for each level. */
  65. #define PTL0_SIZE_ARCH      ONE_FRAME
  66. #define PTL1_SIZE_ARCH      0
  67. #define PTL2_SIZE_ARCH      0
  68. #define PTL3_SIZE_ARCH      ONE_FRAME
  69.  
  70. /* Macros calculating indices for each level. */
  71. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
  72. #define PTL1_INDEX_ARCH(vaddr)  0
  73. #define PTL2_INDEX_ARCH(vaddr)  0
  74. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
  75.  
  76. /* Get PTE address accessors for each level. */
  77. #define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
  78.     ((pte_t *) ((((pte_t *) (ptl0))[(i)].frame_address) << 12))
  79. #define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
  80.     (ptl1)
  81. #define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
  82.     (ptl2)
  83. #define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
  84.     ((uintptr_t) ((((pte_t *) (ptl3))[(i)].frame_address) << 12))
  85.  
  86. /* Set PTE address accessors for each level. */
  87. #define SET_PTL0_ADDRESS_ARCH(ptl0) \
  88.     (write_cr3((uintptr_t) (ptl0)))
  89. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
  90.     (((pte_t *) (ptl0))[(i)].frame_address = (a) >> 12)
  91. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  92. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  93. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
  94.     (((pte_t *) (ptl3))[(i)].frame_address = (a) >> 12)
  95.  
  96. /* Get PTE flags accessors for each level. */
  97. #define GET_PTL1_FLAGS_ARCH(ptl0, i) \
  98.     get_pt_flags((pte_t *) (ptl0), (size_t) (i))
  99. #define GET_PTL2_FLAGS_ARCH(ptl1, i) \
  100.     PAGE_PRESENT
  101. #define GET_PTL3_FLAGS_ARCH(ptl2, i) \
  102.     PAGE_PRESENT
  103. #define GET_FRAME_FLAGS_ARCH(ptl3, i) \
  104.     get_pt_flags((pte_t *) (ptl3), (size_t) (i))
  105.  
  106. /* Set PTE flags accessors for each level. */
  107. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
  108.     set_pt_flags((pte_t *) (ptl0), (size_t) (i), (x))
  109. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  110. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  111. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \
  112.     set_pt_flags((pte_t *) (ptl3), (size_t) (i), (x))
  113.  
  114. /* Macros for querying the last level entries. */
  115. #define PTE_VALID_ARCH(p) \
  116.     (*((uint32_t *) (p)) != 0)
  117. #define PTE_PRESENT_ARCH(p) \
  118.     ((p)->present != 0)
  119. #define PTE_GET_FRAME_ARCH(p) \
  120.     ((p)->frame_address << FRAME_WIDTH)
  121. #define PTE_WRITABLE_ARCH(p) \
  122.     ((p)->writeable != 0)
  123. #define PTE_EXECUTABLE_ARCH(p)          1
  124.  
  125. #ifndef __ASM__
  126.  
  127. #include <mm/mm.h>
  128. #include <arch/interrupt.h>
  129. #include <arch/types.h>
  130. #include <typedefs.h>
  131.  
  132. /* Page fault error codes. */
  133.  
  134. /** When bit on this position is 0, the page fault was caused by a not-present
  135.  * page.
  136.  */
  137. #define PFERR_CODE_P        (1 << 0)
  138.  
  139. /** When bit on this position is 1, the page fault was caused by a write. */
  140. #define PFERR_CODE_RW       (1 << 1)
  141.  
  142. /** When bit on this position is 1, the page fault was caused in user mode. */
  143. #define PFERR_CODE_US       (1 << 2)
  144.  
  145. /** When bit on this position is 1, a reserved bit was set in page directory. */
  146. #define PFERR_CODE_RSVD     (1 << 3)   
  147.  
  148. static inline int get_pt_flags(pte_t *pt, size_t i)
  149. {
  150.     pte_t *p = &pt[i];
  151.    
  152.     return ((!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
  153.         (!p->present) << PAGE_PRESENT_SHIFT |
  154.         p->uaccessible << PAGE_USER_SHIFT |
  155.         1 << PAGE_READ_SHIFT |
  156.         p->writeable << PAGE_WRITE_SHIFT |
  157.         1 << PAGE_EXEC_SHIFT |
  158.         p->global << PAGE_GLOBAL_SHIFT);
  159. }
  160.  
  161. static inline void set_pt_flags(pte_t *pt, size_t i, int flags)
  162. {
  163.     pte_t *p = &pt[i];
  164.    
  165.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  166.     p->present = !(flags & PAGE_NOT_PRESENT);
  167.     p->uaccessible = (flags & PAGE_USER) != 0;
  168.     p->writeable = (flags & PAGE_WRITE) != 0;
  169.     p->global = (flags & PAGE_GLOBAL) != 0;
  170.    
  171.     /*
  172.      * Ensure that there is at least one bit set even if the present bit is
  173.      * cleared.
  174.      */
  175.     p->soft_valid = true;
  176. }
  177.  
  178. extern void page_arch_init(void);
  179. extern void page_fault(int n, istate_t *istate);
  180.  
  181. #endif /* __ASM__ */
  182.  
  183. #endif /* KERNEL */
  184.  
  185. #endif
  186.  
  187. /** @}
  188.  */
  189.