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
