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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _PGTABLE_NOPMD_H |
3 | #define _PGTABLE_NOPMD_H | |
4 | ||
5 | #ifndef __ASSEMBLY__ | |
6 | ||
7 | #include <asm-generic/pgtable-nopud.h> | |
8 | ||
34ee5501 AM |
9 | struct mm_struct; |
10 | ||
1da177e4 LT |
11 | #define __PAGETABLE_PMD_FOLDED |
12 | ||
13 | /* | |
14 | * Having the pmd type consist of a pud gets the size right, and allows | |
15 | * us to conceptually access the pud entry that this pmd is folded into | |
16 | * without casting. | |
17 | */ | |
18 | typedef struct { pud_t pud; } pmd_t; | |
19 | ||
20 | #define PMD_SHIFT PUD_SHIFT | |
21 | #define PTRS_PER_PMD 1 | |
22 | #define PMD_SIZE (1UL << PMD_SHIFT) | |
23 | #define PMD_MASK (~(PMD_SIZE-1)) | |
24 | ||
25 | /* | |
26 | * The "pud_xxx()" functions here are trivial for a folded two-level | |
27 | * setup: the pmd is never bad, and a pmd always exists (as it's folded | |
28 | * into the pud entry) | |
29 | */ | |
30 | static inline int pud_none(pud_t pud) { return 0; } | |
31 | static inline int pud_bad(pud_t pud) { return 0; } | |
32 | static inline int pud_present(pud_t pud) { return 1; } | |
33 | static inline void pud_clear(pud_t *pud) { } | |
34 | #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud)) | |
35 | ||
36 | #define pud_populate(mm, pmd, pte) do { } while (0) | |
37 | ||
38 | /* | |
39 | * (pmds are folded into puds so this doesn't get actually called, | |
40 | * but the define is needed for a generic inline function.) | |
41 | */ | |
42 | #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval }) | |
43 | ||
44 | static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) | |
45 | { | |
46 | return (pmd_t *)pud; | |
47 | } | |
48 | ||
49 | #define pmd_val(x) (pud_val((x).pud)) | |
50 | #define __pmd(x) ((pmd_t) { __pud(x) } ) | |
51 | ||
52 | #define pud_page(pud) (pmd_page((pmd_t){ pud })) | |
46a82b2d | 53 | #define pud_page_vaddr(pud) (pmd_page_vaddr((pmd_t){ pud })) |
1da177e4 LT |
54 | |
55 | /* | |
56 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
57 | * inside the pud, so has no extra memory associated with it. | |
58 | */ | |
59 | #define pmd_alloc_one(mm, address) NULL | |
34ee5501 AM |
60 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
61 | { | |
62 | } | |
9e1b32ca | 63 | #define __pmd_free_tlb(tlb, x, a) do { } while (0) |
1da177e4 LT |
64 | |
65 | #undef pmd_addr_end | |
66 | #define pmd_addr_end(addr, end) (end) | |
67 | ||
68 | #endif /* __ASSEMBLY__ */ | |
69 | ||
70 | #endif /* _PGTABLE_NOPMD_H */ |