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1da177e4 LT |
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 })) | |
46a82b2d | 47 | #define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd })) |
1da177e4 LT |
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 | |
5e541973 | 54 | #define pud_free(mm, x) do { } while (0) |
1da177e4 LT |
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 */ |