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  1. #ifndef _PGTABLE_NOPUD_H
  2. #define _PGTABLE_NOPUD_H
  3.  
  4. #ifndef __ASSEMBLY__
  5.  
  6. #define __PAGETABLE_PUD_FOLDED
  7.  
  8. /*
  9.  * Having the pud type consist of a pgd gets the size right, and allows
  10.  * us to conceptually access the pgd entry that this pud is folded into
  11.  * without casting.
  12.  */
  13. typedef struct { pgd_t pgd; } pud_t;
  14.  
  15. #define PUD_SHIFT       PGDIR_SHIFT
  16. #define PTRS_PER_PUD    1
  17. #define PUD_SIZE        (1UL << PUD_SHIFT)
  18. #define PUD_MASK        (~(PUD_SIZE-1))
  19.  
  20. /*
  21.  * The "pgd_xxx()" functions here are trivial for a folded two-level
  22.  * setup: the pud is never bad, and a pud always exists (as it's folded
  23.  * into the pgd entry)
  24.  */
  25. static inline int pgd_none(pgd_t pgd)           { return 0; }
  26. static inline int pgd_bad(pgd_t pgd)            { return 0; }
  27. static inline int pgd_present(pgd_t pgd)        { return 1; }
  28. static inline void pgd_clear(pgd_t *pgd)        { }
  29. #define pud_ERROR(pud)                          (pgd_ERROR((pud).pgd))
  30.  
  31. #define pgd_populate(mm, pgd, pud)              do { } while (0)
  32. /*
  33.  * (puds are folded into pgds so this doesn't get actually called,
  34.  * but the define is needed for a generic inline function.)
  35.  */
  36. #define set_pgd(pgdptr, pgdval)                 set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
  37.  
  38. static inline pud_t * pud_offset(pgd_t * pgd, unsigned long address)
  39. {
  40.         return (pud_t *)pgd;
  41. }
  42.  
  43. #define pud_val(x)                              (pgd_val((x).pgd))
  44. #define __pud(x)                                ((pud_t) { __pgd(x) } )
  45.  
  46. #define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
  47. #define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
  48.  
  49. /*
  50.  * allocating and freeing a pud is trivial: the 1-entry pud is
  51.  * inside the pgd, so has no extra memory associated with it.
  52.  */
  53. #define pud_alloc_one(mm, address)              NULL
  54. #define pud_free(mm, x)                         do { } while (0)
  55. #define __pud_free_tlb(tlb, x, a)               do { } while (0)
  56.  
  57. #undef  pud_addr_end
  58. #define pud_addr_end(addr, end)                 (end)
  59.  
  60. #endif /* __ASSEMBLY__ */
  61. #endif /* _PGTABLE_NOPUD_H */
  62.