]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | #ifndef _PGTABLE_NOP4D_HACK_H | |
3 | #define _PGTABLE_NOP4D_HACK_H | |
4 | ||
5 | #ifndef __ASSEMBLY__ | |
6 | #include <asm-generic/5level-fixup.h> | |
7 | ||
8 | #define __PAGETABLE_PUD_FOLDED 1 | |
9 | ||
10 | /* | |
11 | * Having the pud type consist of a pgd gets the size right, and allows | |
12 | * us to conceptually access the pgd entry that this pud is folded into | |
13 | * without casting. | |
14 | */ | |
15 | typedef struct { pgd_t pgd; } pud_t; | |
16 | ||
17 | #define PUD_SHIFT PGDIR_SHIFT | |
18 | #define PTRS_PER_PUD 1 | |
19 | #define PUD_SIZE (1UL << PUD_SHIFT) | |
20 | #define PUD_MASK (~(PUD_SIZE-1)) | |
21 | ||
22 | /* | |
23 | * The "pgd_xxx()" functions here are trivial for a folded two-level | |
24 | * setup: the pud is never bad, and a pud always exists (as it's folded | |
25 | * into the pgd entry) | |
26 | */ | |
27 | static inline int pgd_none(pgd_t pgd) { return 0; } | |
28 | static inline int pgd_bad(pgd_t pgd) { return 0; } | |
29 | static inline int pgd_present(pgd_t pgd) { return 1; } | |
30 | static inline void pgd_clear(pgd_t *pgd) { } | |
31 | #define pud_ERROR(pud) (pgd_ERROR((pud).pgd)) | |
32 | ||
33 | #define pgd_populate(mm, pgd, pud) do { } while (0) | |
34 | /* | |
35 | * (puds are folded into pgds so this doesn't get actually called, | |
36 | * but the define is needed for a generic inline function.) | |
37 | */ | |
38 | #define set_pgd(pgdptr, pgdval) set_pud((pud_t *)(pgdptr), (pud_t) { pgdval }) | |
39 | ||
40 | static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) | |
41 | { | |
42 | return (pud_t *)pgd; | |
43 | } | |
44 | ||
45 | #define pud_val(x) (pgd_val((x).pgd)) | |
46 | #define __pud(x) ((pud_t) { __pgd(x) }) | |
47 | ||
48 | #define pgd_page(pgd) (pud_page((pud_t){ pgd })) | |
49 | #define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd })) | |
50 | ||
51 | /* | |
52 | * allocating and freeing a pud is trivial: the 1-entry pud is | |
53 | * inside the pgd, so has no extra memory associated with it. | |
54 | */ | |
55 | #define pud_alloc_one(mm, address) NULL | |
56 | #define pud_free(mm, x) do { } while (0) | |
57 | #define __pud_free_tlb(tlb, x, a) do { } while (0) | |
58 | ||
59 | #undef pud_addr_end | |
60 | #define pud_addr_end(addr, end) (end) | |
61 | ||
62 | #endif /* __ASSEMBLY__ */ | |
63 | #endif /* _PGTABLE_NOP4D_HACK_H */ |