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