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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _PGTABLE_NOPMD_H
2#define _PGTABLE_NOPMD_H
3
4#ifndef __ASSEMBLY__
5
6#include <asm-generic/pgtable-nopud.h>
7
8#define __PAGETABLE_PMD_FOLDED
9
10/*
11 * Having the pmd type consist of a pud gets the size right, and allows
12 * us to conceptually access the pud entry that this pmd is folded into
13 * without casting.
14 */
15typedef struct { pud_t pud; } pmd_t;
16
17#define PMD_SHIFT PUD_SHIFT
18#define PTRS_PER_PMD 1
19#define PMD_SIZE (1UL << PMD_SHIFT)
20#define PMD_MASK (~(PMD_SIZE-1))
21
22/*
23 * The "pud_xxx()" functions here are trivial for a folded two-level
24 * setup: the pmd is never bad, and a pmd always exists (as it's folded
25 * into the pud entry)
26 */
27static inline int pud_none(pud_t pud) { return 0; }
28static inline int pud_bad(pud_t pud) { return 0; }
29static inline int pud_present(pud_t pud) { return 1; }
30static inline void pud_clear(pud_t *pud) { }
31#define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
32
33#define pud_populate(mm, pmd, pte) do { } while (0)
34
35/*
36 * (pmds are folded into puds so this doesn't get actually called,
37 * but the define is needed for a generic inline function.)
38 */
39#define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
40
41static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
42{
43 return (pmd_t *)pud;
44}
45
46#define pmd_val(x) (pud_val((x).pud))
47#define __pmd(x) ((pmd_t) { __pud(x) } )
48
49#define pud_page(pud) (pmd_page((pmd_t){ pud }))
50#define pud_page_kernel(pud) (pmd_page_kernel((pmd_t){ pud }))
51
52/*
53 * allocating and freeing a pmd is trivial: the 1-entry pmd is
54 * inside the pud, so has no extra memory associated with it.
55 */
56#define pmd_alloc_one(mm, address) NULL
57#define pmd_free(x) do { } while (0)
58#define __pmd_free_tlb(tlb, x) do { } while (0)
59
60#undef pmd_addr_end
61#define pmd_addr_end(addr, end) (end)
62
63#endif /* __ASSEMBLY__ */
64
65#endif /* _PGTABLE_NOPMD_H */