LXR linux/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 */
  15typedef 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 */
  27static inline int pud_none(pud_t pud)           { return 0; }
  28static inline int pud_bad(pud_t pud)            { return 0; }
  29static inline int pud_present(pud_t pud)        { return 1; }
  30static 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
  41static 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_vaddr(pud)                     (pmd_page_vaddr((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 */
  66