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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
048456dc KS |
2 | #ifndef _PGTABLE_NOP4D_H |
3 | #define _PGTABLE_NOP4D_H | |
4 | ||
5 | #ifndef __ASSEMBLY__ | |
6 | ||
7 | #define __PAGETABLE_P4D_FOLDED | |
8 | ||
9 | typedef struct { pgd_t pgd; } p4d_t; | |
10 | ||
11 | #define P4D_SHIFT PGDIR_SHIFT | |
12 | #define PTRS_PER_P4D 1 | |
13 | #define P4D_SIZE (1UL << P4D_SHIFT) | |
14 | #define P4D_MASK (~(P4D_SIZE-1)) | |
15 | ||
16 | /* | |
17 | * The "pgd_xxx()" functions here are trivial for a folded two-level | |
18 | * setup: the p4d is never bad, and a p4d always exists (as it's folded | |
19 | * into the pgd entry) | |
20 | */ | |
21 | static inline int pgd_none(pgd_t pgd) { return 0; } | |
22 | static inline int pgd_bad(pgd_t pgd) { return 0; } | |
23 | static inline int pgd_present(pgd_t pgd) { return 1; } | |
24 | static inline void pgd_clear(pgd_t *pgd) { } | |
25 | #define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd)) | |
26 | ||
27 | #define pgd_populate(mm, pgd, p4d) do { } while (0) | |
28 | /* | |
29 | * (p4ds are folded into pgds so this doesn't get actually called, | |
30 | * but the define is needed for a generic inline function.) | |
31 | */ | |
32 | #define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval }) | |
33 | ||
34 | static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) | |
35 | { | |
36 | return (p4d_t *)pgd; | |
37 | } | |
38 | ||
39 | #define p4d_val(x) (pgd_val((x).pgd)) | |
40 | #define __p4d(x) ((p4d_t) { __pgd(x) }) | |
41 | ||
42 | #define pgd_page(pgd) (p4d_page((p4d_t){ pgd })) | |
43 | #define pgd_page_vaddr(pgd) (p4d_page_vaddr((p4d_t){ pgd })) | |
44 | ||
45 | /* | |
46 | * allocating and freeing a p4d is trivial: the 1-entry p4d is | |
47 | * inside the pgd, so has no extra memory associated with it. | |
48 | */ | |
49 | #define p4d_alloc_one(mm, address) NULL | |
50 | #define p4d_free(mm, x) do { } while (0) | |
51 | #define __p4d_free_tlb(tlb, x, a) do { } while (0) | |
52 | ||
53 | #undef p4d_addr_end | |
54 | #define p4d_addr_end(addr, end) (end) | |
55 | ||
56 | #endif /* __ASSEMBLY__ */ | |
57 | #endif /* _PGTABLE_NOP4D_H */ |