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  1. #ifndef _ASM_X86_PGTABLE_2LEVEL_H
  2. #define _ASM_X86_PGTABLE_2LEVEL_H
  3.  
  4. #define pte_ERROR(e) \
  5.         pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
  6. #define pgd_ERROR(e) \
  7.         pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e))
  8.  
  9. /*
  10.  * Certain architectures need to do special things when PTEs
  11.  * within a page table are directly modified.  Thus, the following
  12.  * hook is made available.
  13.  */
  14. static inline void native_set_pte(pte_t *ptep , pte_t pte)
  15. {
  16.         *ptep = pte;
  17. }
  18.  
  19. static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  20. {
  21.         *pmdp = pmd;
  22. }
  23.  
  24. static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  25. {
  26.         native_set_pte(ptep, pte);
  27. }
  28.  
  29. static inline void native_pmd_clear(pmd_t *pmdp)
  30. {
  31.         native_set_pmd(pmdp, __pmd(0));
  32. }
  33.  
  34. static inline void native_pte_clear(struct mm_struct *mm,
  35.                                     unsigned long addr, pte_t *xp)
  36. {
  37.         *xp = native_make_pte(0);
  38. }
  39.  
  40. #ifdef CONFIG_SMP
  41. static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  42. {
  43.         return __pte(xchg(&xp->pte_low, 0));
  44. }
  45. #else
  46. #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
  47. #endif
  48.  
  49. #ifdef CONFIG_SMP
  50. static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  51. {
  52.         return __pmd(xchg((pmdval_t *)xp, 0));
  53. }
  54. #else
  55. #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
  56. #endif
  57.  
  58. /* Bit manipulation helper on pte/pgoff entry */
  59. static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
  60.                                       unsigned long mask, unsigned int leftshift)
  61. {
  62.         return ((value >> rightshift) & mask) << leftshift;
  63. }
  64.  
  65. /*
  66.  * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
  67.  * split up the 29 bits of offset into this range.
  68.  */
  69. #define PTE_FILE_MAX_BITS       29
  70. #define PTE_FILE_SHIFT1         (_PAGE_BIT_PRESENT + 1)
  71. #define PTE_FILE_SHIFT2         (_PAGE_BIT_FILE + 1)
  72. #define PTE_FILE_SHIFT3         (_PAGE_BIT_PROTNONE + 1)
  73. #define PTE_FILE_BITS1          (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
  74. #define PTE_FILE_BITS2          (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
  75.  
  76. #define PTE_FILE_MASK1          ((1U << PTE_FILE_BITS1) - 1)
  77. #define PTE_FILE_MASK2          ((1U << PTE_FILE_BITS2) - 1)
  78.  
  79. #define PTE_FILE_LSHIFT2        (PTE_FILE_BITS1)
  80. #define PTE_FILE_LSHIFT3        (PTE_FILE_BITS1 + PTE_FILE_BITS2)
  81.  
  82. static __always_inline pgoff_t pte_to_pgoff(pte_t pte)
  83. {
  84.         return (pgoff_t)
  85.                 (pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1,  0)                +
  86.                  pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2,  PTE_FILE_LSHIFT2) +
  87.                  pte_bitop(pte.pte_low, PTE_FILE_SHIFT3,           -1UL,  PTE_FILE_LSHIFT3));
  88. }
  89.  
  90. static __always_inline pte_t pgoff_to_pte(pgoff_t off)
  91. {
  92.         return (pte_t){
  93.                 .pte_low =
  94.                         pte_bitop(off,                0, PTE_FILE_MASK1,  PTE_FILE_SHIFT1) +
  95.                         pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2,  PTE_FILE_SHIFT2) +
  96.                         pte_bitop(off, PTE_FILE_LSHIFT3,           -1UL,  PTE_FILE_SHIFT3) +
  97.                         _PAGE_FILE,
  98.         };
  99. }
  100.  
  101. /* Encode and de-code a swap entry */
  102. #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
  103. #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
  104.  
  105. #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
  106.  
  107. #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
  108.                                          & ((1U << SWP_TYPE_BITS) - 1))
  109. #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
  110. #define __swp_entry(type, offset)       ((swp_entry_t) { \
  111.                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
  112.                                          | ((offset) << SWP_OFFSET_SHIFT) })
  113. #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  114. #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
  115.  
  116. #endif /* _ASM_X86_PGTABLE_2LEVEL_H */
  117.