include/asm-generic/pgtable-nopmd.h

   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 */