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