1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PGTABLE_NOPMD_H
3 #define _PGTABLE_NOPMD_H
4
5 #ifndef __ASSEMBLY__
6
7 #include <asm-generic/pgtable-nopud.h>
8
9 struct mm_struct;
10
11 #define __PAGETABLE_PMD_FOLDED 1
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 int pud_user(pud_t pud) { return 0; }
34 static inline int pud_leaf(pud_t pud) { return 0; }
35 static inline void pud_clear(pud_t *pud) { }
36 #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
37
38 #define pud_populate(mm, pmd, pte) do { } while (0)
39
40 /*
41 * (pmds are folded into puds so this doesn't get actually called,
42 * but the define is needed for a generic inline function.)
43 */
44 #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
45
46 static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
47 {
48 return (pmd_t *)pud;
49 }
50 #define pmd_offset pmd_offset
51
52 #define pmd_val(x) (pud_val((x).pud))
53 #define __pmd(x) ((pmd_t) { __pud(x) } )
54
55 #define pud_page(pud) (pmd_page((pmd_t){ pud }))
56 #define pud_pgtable(pud) ((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
57
58 /*
59 * allocating and freeing a pmd is trivial: the 1-entry pmd is
60 * inside the pud, so has no extra memory associated with it.
61 */
62 #define pmd_alloc_one(mm, address) NULL
63 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
64 {
65 }
66 #define pmd_free_tlb(tlb, x, a) do { } while (0)
67
68 #undef pmd_addr_end
69 #define pmd_addr_end(addr, end) (end)
70
71 #endif /* __ASSEMBLY__ */
72
73 #endif /* _PGTABLE_NOPMD_H */
74
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