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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. #define PAGE_COLOR_BITS 0           /* dummy */
  44.  
  45. #ifdef KERNEL
  46.  
  47. #ifndef __ASM__
  48. #   define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
  49. #   define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
  50. #else
  51. #   define KA2PA(x) ((x) - 0x80000000)
  52. #   define PA2KA(x) ((x) + 0x80000000)
  53. #endif
  54.  
  55. /*
  56.  * Implementation of generic 4-level page table interface.
  57.  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  58.  */
  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. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>22)&0x3ff)
  65. #define PTL1_INDEX_ARCH(vaddr)  0
  66. #define PTL2_INDEX_ARCH(vaddr)  0
  67. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x3ff)
  68.  
  69. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12))
  70. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  71. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  72. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((uintptr_t)((((pte_t *)(ptl3))[(i)].frame_address)<<12))
  73.  
  74. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((uintptr_t) (ptl0)))
  75. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12)
  76. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  77. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  78. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12)
  79.  
  80. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  81. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  82. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  83. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  84.  
  85. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  86. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  87. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  88. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  89.  
  90. #define PTE_VALID_ARCH(p)           (*((uint32_t *) (p)) != 0)
  91. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  92. #define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address<<FRAME_WIDTH)
  93. #define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
  94. #define PTE_EXECUTABLE_ARCH(p)          1
  95.  
  96. #ifndef __ASM__
  97.  
  98. #include <mm/page.h>
  99. #include <arch/types.h>
  100. #include <arch/mm/frame.h>
  101. #include <typedefs.h>
  102.  
  103. /* Page fault error codes. */
  104.  
  105. /** When bit on this position is 0, the page fault was caused by a not-present page. */
  106. #define PFERR_CODE_P        (1<<0)
  107.  
  108. /** When bit on this position is 1, the page fault was caused by a write. */
  109. #define PFERR_CODE_RW       (1<<1)
  110.  
  111. /** When bit on this position is 1, the page fault was caused in user mode. */
  112. #define PFERR_CODE_US       (1<<2)
  113.  
  114. /** When bit on this position is 1, a reserved bit was set in page directory. */
  115. #define PFERR_CODE_RSVD     (1<<3) 
  116.  
  117. /** Page Table Entry. */
  118. struct page_specifier {
  119.     unsigned present : 1;
  120.     unsigned writeable : 1;
  121.     unsigned uaccessible : 1;
  122.     unsigned page_write_through : 1;
  123.     unsigned page_cache_disable : 1;
  124.     unsigned accessed : 1;
  125.     unsigned dirty : 1;
  126.     unsigned pat : 1;
  127.     unsigned global : 1;
  128.     unsigned soft_valid : 1;    /**< Valid content even if the present bit is not set. */
  129.     unsigned avl : 2;
  130.     unsigned frame_address : 20;
  131. } __attribute__ ((packed));
  132.  
  133. static inline int get_pt_flags(pte_t *pt, index_t i)
  134. {
  135.     pte_t *p = &pt[i];
  136.    
  137.     return (
  138.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  139.         (!p->present)<<PAGE_PRESENT_SHIFT |
  140.         p->uaccessible<<PAGE_USER_SHIFT |
  141.         1<<PAGE_READ_SHIFT |
  142.         p->writeable<<PAGE_WRITE_SHIFT |
  143.         1<<PAGE_EXEC_SHIFT |
  144.         p->global<<PAGE_GLOBAL_SHIFT
  145.     );
  146. }
  147.  
  148. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  149. {
  150.     pte_t *p = &pt[i];
  151.    
  152.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  153.     p->present = !(flags & PAGE_NOT_PRESENT);
  154.     p->uaccessible = (flags & PAGE_USER) != 0;
  155.     p->writeable = (flags & PAGE_WRITE) != 0;
  156.     p->global = (flags & PAGE_GLOBAL) != 0;
  157.    
  158.     /*
  159.      * Ensure that there is at least one bit set even if the present bit is cleared.
  160.      */
  161.     p->soft_valid = true;
  162. }
  163.  
  164. extern void page_arch_init(void);
  165. extern void page_fault(int n, istate_t *istate);
  166.  
  167. #endif /* __ASM__ */
  168.  
  169. #endif /* KERNEL */
  170.  
  171. #endif
  172.  
  173. /** @}
  174.  */
  175.