include/asm-generic/pgtable-nopud.h

   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_kernel(pgd)                    (pud_page_kernel((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(x)                             do { } while (0)
  55 #define __pud_free_tlb(tlb, x)                  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 */