| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _PGTABLE_NOPUD_H |
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| 3 | #define _PGTABLE_NOPUD_H |
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| 4 | |
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| 5 | #ifndef __ASSEMBLY__ |
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| 6 | |
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| 7 | #include <asm-generic/pgtable-nop4d.h> |
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| 8 | |
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| 9 | #define __PAGETABLE_PUD_FOLDED 1 |
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| 10 | |
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| 11 | /* |
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| 12 | * Having the pud type consist of a p4d gets the size right, and allows |
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| 13 | * us to conceptually access the p4d entry that this pud is folded into |
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| 14 | * without casting. |
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| 15 | */ |
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| 16 | typedef struct { p4d_t p4d; } pud_t; |
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| 17 | |
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| 18 | #define PUD_SHIFT P4D_SHIFT |
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| 19 | #define PTRS_PER_PUD 1 |
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| 20 | #define PUD_SIZE (1UL << PUD_SHIFT) |
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| 21 | #define PUD_MASK (~(PUD_SIZE-1)) |
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| 22 | |
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| 23 | /* |
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| 24 | * The "p4d_xxx()" functions here are trivial for a folded two-level |
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| 25 | * setup: the pud is never bad, and a pud always exists (as it's folded |
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| 26 | * into the p4d entry) |
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| 27 | */ |
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| 28 | static inline int p4d_none(p4d_t p4d) { return 0; } |
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| 29 | static inline int p4d_bad(p4d_t p4d) { return 0; } |
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| 30 | static inline int p4d_present(p4d_t p4d) { return 1; } |
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| 31 | static inline void p4d_clear(p4d_t *p4d) { } |
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| 32 | #define pud_ERROR(pud) (p4d_ERROR((pud).p4d)) |
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| 33 | |
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| 34 | #define p4d_populate(mm, p4d, pud) do { } while (0) |
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| 35 | #define p4d_populate_safe(mm, p4d, pud) do { } while (0) |
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| 36 | /* |
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| 37 | * (puds are folded into p4ds so this doesn't get actually called, |
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| 38 | * but the define is needed for a generic inline function.) |
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| 39 | */ |
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| 40 | #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval }) |
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| 41 | |
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| 42 | static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) |
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| 43 | { |
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| 44 | return (pud_t *)p4d; |
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| 45 | } |
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| 46 | #define pud_offset pud_offset |
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| 47 | |
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| 48 | #define pud_val(x) (p4d_val((x).p4d)) |
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| 49 | #define __pud(x) ((pud_t) { __p4d(x) }) |
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| 50 | |
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| 51 | #define p4d_page(p4d) (pud_page((pud_t){ p4d })) |
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| 52 | #define p4d_pgtable(p4d) ((pud_t *)(pud_pgtable((pud_t){ p4d }))) |
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| 53 | |
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| 54 | /* |
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| 55 | * allocating and freeing a pud is trivial: the 1-entry pud is |
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| 56 | * inside the p4d, so has no extra memory associated with it. |
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| 57 | */ |
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| 58 | #define pud_alloc_one(mm, address) NULL |
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| 59 | #define pud_free(mm, x) do { } while (0) |
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| 60 | #define pud_free_tlb(tlb, x, a) do { } while (0) |
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| 61 | |
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| 62 | #undef pud_addr_end |
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| 63 | #define pud_addr_end(addr, end) (end) |
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| 64 | |
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| 65 | #endif /* __ASSEMBLY__ */ |
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| 66 | #endif /* _PGTABLE_NOPUD_H */ |
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| 67 | |
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