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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_kernel(pgd)			(pud_page_kernel((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(x)				do { } while (0)
     55 #define __pud_free_tlb(tlb, x)			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