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

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 */
13typedef 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 */
25static inline int pgd_none(pgd_t pgd) { return 0; }
26static inline int pgd_bad(pgd_t pgd) { return 0; }
27static inline int pgd_present(pgd_t pgd) { return 1; }
28static 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
38static 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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