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  1. #ifndef _PGTABLE_NOPMD_H
  2. #define _PGTABLE_NOPMD_H
  3.  
  4. #ifndef __ASSEMBLY__
  5.  
  6. #include <asm-generic/pgtable-nopud.h>
  7.  
  8. struct mm_struct;
  9.  
  10. #define __PAGETABLE_PMD_FOLDED
  11.  
  12. /*
  13.  * Having the pmd type consist of a pud gets the size right, and allows
  14.  * us to conceptually access the pud entry that this pmd is folded into
  15.  * without casting.
  16.  */
  17. typedef struct { pud_t pud; } pmd_t;
  18.  
  19. #define PMD_SHIFT       PUD_SHIFT
  20. #define PTRS_PER_PMD    1
  21. #define PMD_SIZE        (1UL << PMD_SHIFT)
  22. #define PMD_MASK        (~(PMD_SIZE-1))
  23.  
  24. /*
  25.  * The "pud_xxx()" functions here are trivial for a folded two-level
  26.  * setup: the pmd is never bad, and a pmd always exists (as it's folded
  27.  * into the pud entry)
  28.  */
  29. static inline int pud_none(pud_t pud)           { return 0; }
  30. static inline int pud_bad(pud_t pud)            { return 0; }
  31. static inline int pud_present(pud_t pud)        { return 1; }
  32. static inline void pud_clear(pud_t *pud)        { }
  33. #define pmd_ERROR(pmd)                          (pud_ERROR((pmd).pud))
  34.  
  35. #define pud_populate(mm, pmd, pte)              do { } while (0)
  36.  
  37. /*
  38.  * (pmds are folded into puds so this doesn't get actually called,
  39.  * but the define is needed for a generic inline function.)
  40.  */
  41. #define set_pud(pudptr, pudval)                 set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
  42.  
  43. static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
  44. {
  45.         return (pmd_t *)pud;
  46. }
  47.  
  48. #define pmd_val(x)                              (pud_val((x).pud))
  49. #define __pmd(x)                                ((pmd_t) { __pud(x) } )
  50.  
  51. #define pud_page(pud)                           (pmd_page((pmd_t){ pud }))
  52. #define pud_page_vaddr(pud)                     (pmd_page_vaddr((pmd_t){ pud }))
  53.  
  54. /*
  55.  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  56.  * inside the pud, so has no extra memory associated with it.
  57.  */
  58. #define pmd_alloc_one(mm, address)              NULL
  59. static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  60. {
  61. }
  62. #define __pmd_free_tlb(tlb, x, a)               do { } while (0)
  63.  
  64. #undef  pmd_addr_end
  65. #define pmd_addr_end(addr, end)                 (end)
  66.  
  67. #endif /* __ASSEMBLY__ */
  68.  
  69. #endif /* _PGTABLE_NOPMD_H */
  70.