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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 __ia32_PAGE_H__
  36. #define __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) (((__address) (x)) - 0x80000000)
  47. #   define PA2KA(x) (((__address) (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. #define PTL0_ENTRIES_ARCH   1024
  58. #define PTL1_ENTRIES_ARCH   0
  59. #define PTL2_ENTRIES_ARCH   0
  60. #define PTL3_ENTRIES_ARCH   1024
  61.  
  62. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>22)&0x3ff)
  63. #define PTL1_INDEX_ARCH(vaddr)  0
  64. #define PTL2_INDEX_ARCH(vaddr)  0
  65. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x3ff)
  66.  
  67. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12))
  68. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  69. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  70. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12))
  71.  
  72. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))
  73. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12)
  74. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  75. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  76. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12)
  77.  
  78. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  79. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  80. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  81. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  82.  
  83. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  84. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  85. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  86. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  87.  
  88. #define PTE_VALID_ARCH(p)           (*((__u32 *) (p)) != 0)
  89. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  90. #define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address<<FRAME_WIDTH)
  91. #define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
  92. #define PTE_EXECUTABLE_ARCH(p)          1
  93.  
  94. #ifndef __ASM__
  95.  
  96. #include <mm/page.h>
  97. #include <arch/types.h>
  98. #include <arch/mm/frame.h>
  99. #include <typedefs.h>
  100.  
  101. /* Page fault error codes. */
  102.  
  103. /** When bit on this position is 0, the page fault was caused by a not-present page. */
  104. #define PFERR_CODE_P        (1<<0)
  105.  
  106. /** When bit on this position is 1, the page fault was caused by a write. */
  107. #define PFERR_CODE_RW       (1<<1)
  108.  
  109. /** When bit on this position is 1, the page fault was caused in user mode. */
  110. #define PFERR_CODE_US       (1<<2)
  111.  
  112. /** When bit on this position is 1, a reserved bit was set in page directory. */
  113. #define PFERR_CODE_RSVD     (1<<3) 
  114.  
  115. /** Page Table Entry. */
  116. struct page_specifier {
  117.     unsigned present : 1;
  118.     unsigned writeable : 1;
  119.     unsigned uaccessible : 1;
  120.     unsigned page_write_through : 1;
  121.     unsigned page_cache_disable : 1;
  122.     unsigned accessed : 1;
  123.     unsigned dirty : 1;
  124.     unsigned pat : 1;
  125.     unsigned global : 1;
  126.     unsigned soft_valid : 1;    /**< Valid content even if the present bit is not set. */
  127.     unsigned avl : 2;
  128.     unsigned frame_address : 20;
  129. } __attribute__ ((packed));
  130.  
  131. static inline int get_pt_flags(pte_t *pt, index_t i)
  132. {
  133.     pte_t *p = &pt[i];
  134.    
  135.     return (
  136.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  137.         (!p->present)<<PAGE_PRESENT_SHIFT |
  138.         p->uaccessible<<PAGE_USER_SHIFT |
  139.         1<<PAGE_READ_SHIFT |
  140.         p->writeable<<PAGE_WRITE_SHIFT |
  141.         1<<PAGE_EXEC_SHIFT |
  142.         p->global<<PAGE_GLOBAL_SHIFT
  143.     );
  144. }
  145.  
  146. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  147. {
  148.     pte_t *p = &pt[i];
  149.    
  150.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  151.     p->present = !(flags & PAGE_NOT_PRESENT);
  152.     p->uaccessible = (flags & PAGE_USER) != 0;
  153.     p->writeable = (flags & PAGE_WRITE) != 0;
  154.     p->global = (flags & PAGE_GLOBAL) != 0;
  155.    
  156.     /*
  157.      * Ensure that there is at least one bit set even if the present bit is cleared.
  158.      */
  159.     p->soft_valid = true;
  160. }
  161.  
  162. extern void page_arch_init(void);
  163. extern void page_fault(int n, istate_t *istate);
  164.  
  165. #endif /* __ASM__ */
  166.  
  167. #endif /* KERNEL */
  168.  
  169. #endif
  170.  
  171.  /** @}
  172.  */
  173.  
  174.