| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _PGTABLE_NOPMD_H |
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| 3 | #define _PGTABLE_NOPMD_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-nopud.h> |
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| 8 | |
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| 9 | struct mm_struct; |
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| 10 | |
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| 11 | #define __PAGETABLE_PMD_FOLDED 1 |
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| 12 | |
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| 13 | /* |
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| 14 | * Having the pmd type consist of a pud gets the size right, and allows |
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| 15 | * us to conceptually access the pud entry that this pmd is folded into |
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| 16 | * without casting. |
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| 17 | */ |
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| 18 | typedef struct { pud_t pud; } pmd_t; |
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| 19 | |
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| 20 | #define PMD_SHIFT PUD_SHIFT |
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| 21 | #define PTRS_PER_PMD 1 |
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| 22 | #define PMD_SIZE (1UL << PMD_SHIFT) |
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| 23 | #define PMD_MASK (~(PMD_SIZE-1)) |
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| 24 | |
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| 25 | /* |
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| 26 | * The "pud_xxx()" functions here are trivial for a folded two-level |
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| 27 | * setup: the pmd is never bad, and a pmd always exists (as it's folded |
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| 28 | * into the pud entry) |
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| 29 | */ |
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| 30 | static inline int pud_none(pud_t pud) { return 0; } |
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| 31 | static inline int pud_bad(pud_t pud) { return 0; } |
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| 32 | static inline int pud_present(pud_t pud) { return 1; } |
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| 33 | static inline int pud_user(pud_t pud) { return 0; } |
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| 34 | static inline int pud_leaf(pud_t pud) { return 0; } |
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| 35 | static inline void pud_clear(pud_t *pud) { } |
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| 36 | #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud)) |
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| 37 | |
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| 38 | #define pud_populate(mm, pmd, pte) do { } while (0) |
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| 39 | |
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| 40 | /* |
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| 41 | * (pmds are folded into puds so this doesn't get actually called, |
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| 42 | * but the define is needed for a generic inline function.) |
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| 43 | */ |
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| 44 | #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval }) |
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| 45 | |
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| 46 | static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) |
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| 47 | { |
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| 48 | return (pmd_t *)pud; |
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| 49 | } |
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| 50 | #define pmd_offset pmd_offset |
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| 51 | |
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| 52 | #define pmd_val(x) (pud_val((x).pud)) |
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| 53 | #define __pmd(x) ((pmd_t) { __pud(x) } ) |
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| 54 | |
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| 55 | #define pud_page(pud) (pmd_page((pmd_t){ pud })) |
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| 56 | #define pud_pgtable(pud) ((pmd_t *)(pmd_page_vaddr((pmd_t){ pud }))) |
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| 57 | |
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| 58 | /* |
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| 59 | * allocating and freeing a pmd is trivial: the 1-entry pmd is |
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| 60 | * inside the pud, so has no extra memory associated with it. |
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| 61 | */ |
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| 62 | #define pmd_alloc_one(mm, address) NULL |
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| 63 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
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| 64 | { |
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| 65 | } |
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| 66 | #define pmd_free_tlb(tlb, x, a) do { } while (0) |
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| 67 | |
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| 68 | #undef pmd_addr_end |
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| 69 | #define pmd_addr_end(addr, end) (end) |
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| 70 | |
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| 71 | #endif /* __ASSEMBLY__ */ |
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| 72 | |
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| 73 | #endif /* _PGTABLE_NOPMD_H */ |
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| 74 | |
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