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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _PGTABLE_NOPUD_H |
3 | #define _PGTABLE_NOPUD_H | |
4 | ||
5 | #ifndef __ASSEMBLY__ | |
6 | ||
30ec8426 KS |
7 | #ifdef __ARCH_USE_5LEVEL_HACK |
8 | #include <asm-generic/pgtable-nop4d-hack.h> | |
9 | #else | |
048456dc | 10 | #include <asm-generic/pgtable-nop4d.h> |
30ec8426 | 11 | |
1da177e4 LT |
12 | #define __PAGETABLE_PUD_FOLDED |
13 | ||
14 | /* | |
048456dc KS |
15 | * Having the pud type consist of a p4d gets the size right, and allows |
16 | * us to conceptually access the p4d entry that this pud is folded into | |
1da177e4 LT |
17 | * without casting. |
18 | */ | |
048456dc | 19 | typedef struct { p4d_t p4d; } pud_t; |
1da177e4 | 20 | |
048456dc | 21 | #define PUD_SHIFT P4D_SHIFT |
1da177e4 LT |
22 | #define PTRS_PER_PUD 1 |
23 | #define PUD_SIZE (1UL << PUD_SHIFT) | |
24 | #define PUD_MASK (~(PUD_SIZE-1)) | |
25 | ||
26 | /* | |
048456dc | 27 | * The "p4d_xxx()" functions here are trivial for a folded two-level |
1da177e4 | 28 | * setup: the pud is never bad, and a pud always exists (as it's folded |
048456dc | 29 | * into the p4d entry) |
1da177e4 | 30 | */ |
048456dc KS |
31 | static inline int p4d_none(p4d_t p4d) { return 0; } |
32 | static inline int p4d_bad(p4d_t p4d) { return 0; } | |
33 | static inline int p4d_present(p4d_t p4d) { return 1; } | |
34 | static inline void p4d_clear(p4d_t *p4d) { } | |
35 | #define pud_ERROR(pud) (p4d_ERROR((pud).p4d)) | |
1da177e4 | 36 | |
048456dc | 37 | #define p4d_populate(mm, p4d, pud) do { } while (0) |
1da177e4 | 38 | /* |
048456dc | 39 | * (puds are folded into p4ds so this doesn't get actually called, |
1da177e4 LT |
40 | * but the define is needed for a generic inline function.) |
41 | */ | |
048456dc | 42 | #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval }) |
1da177e4 | 43 | |
048456dc | 44 | static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) |
1da177e4 | 45 | { |
048456dc | 46 | return (pud_t *)p4d; |
1da177e4 LT |
47 | } |
48 | ||
048456dc KS |
49 | #define pud_val(x) (p4d_val((x).p4d)) |
50 | #define __pud(x) ((pud_t) { __p4d(x) }) | |
1da177e4 | 51 | |
048456dc KS |
52 | #define p4d_page(p4d) (pud_page((pud_t){ p4d })) |
53 | #define p4d_page_vaddr(p4d) (pud_page_vaddr((pud_t){ p4d })) | |
1da177e4 LT |
54 | |
55 | /* | |
56 | * allocating and freeing a pud is trivial: the 1-entry pud is | |
048456dc | 57 | * inside the p4d, so has no extra memory associated with it. |
1da177e4 LT |
58 | */ |
59 | #define pud_alloc_one(mm, address) NULL | |
5e541973 | 60 | #define pud_free(mm, x) do { } while (0) |
9e1b32ca | 61 | #define __pud_free_tlb(tlb, x, a) do { } while (0) |
1da177e4 LT |
62 | |
63 | #undef pud_addr_end | |
64 | #define pud_addr_end(addr, end) (end) | |
65 | ||
66 | #endif /* __ASSEMBLY__ */ | |
30ec8426 | 67 | #endif /* !__ARCH_USE_5LEVEL_HACK */ |
1da177e4 | 68 | #endif /* _PGTABLE_NOPUD_H */ |