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Linux/include/asm-generic/pgtable-nopud.h

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  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_vaddr(pgd)                     (pud_page_vaddr((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(mm, x)                         do { } while (0)
 55 #define __pud_free_tlb(tlb, x, a)               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 */
 62 

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