linux/include/asm-generic/pgtable-nopmd.h
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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
   8struct 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 */
  17typedef 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 */
  29static inline int pud_none(pud_t pud)           { return 0; }
  30static inline int pud_bad(pud_t pud)            { return 0; }
  31static inline int pud_present(pud_t pud)        { return 1; }
  32static 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
  43static 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
  59static 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
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