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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. /* Encode and de-code a swap entry */
  66. #define SWP_TYPE_BITS 5
  67. #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
  68.  
  69. #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
  70.  
  71. #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
  72.                                          & ((1U << SWP_TYPE_BITS) - 1))
  73. #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
  74. #define __swp_entry(type, offset)       ((swp_entry_t) { \
  75.                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
  76.                                          | ((offset) << SWP_OFFSET_SHIFT) })
  77. #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  78. #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
  79.  
  80. #endif /* _ASM_X86_PGTABLE_2LEVEL_H */
  81.