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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef M68K_MCF_PGALLOC_H |
| 3 | #define M68K_MCF_PGALLOC_H |
| 4 | |
| 5 | #include <asm/tlb.h> |
| 6 | #include <asm/tlbflush.h> |
| 7 | |
| 8 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| 9 | { |
| 10 | pagetable_dtor_free(virt_to_ptdesc(pte)); |
| 11 | } |
| 12 | |
| 13 | extern const char bad_pmd_string[]; |
| 14 | |
| 15 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) |
| 16 | { |
| 17 | struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_ZERO) & |
| 18 | ~__GFP_HIGHMEM, 0); |
| 19 | |
| 20 | if (!ptdesc) |
| 21 | return NULL; |
| 22 | if (!pagetable_pte_ctor(mm, ptdesc)) { |
| 23 | pagetable_free(ptdesc); |
| 24 | return NULL; |
| 25 | } |
| 26 | |
| 27 | return ptdesc_address(ptdesc); |
| 28 | } |
| 29 | |
| 30 | extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address) |
| 31 | { |
| 32 | return (pmd_t *) pgd; |
| 33 | } |
| 34 | |
| 35 | #define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte)) |
| 36 | |
| 37 | #define pmd_populate_kernel pmd_populate |
| 38 | |
| 39 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable, |
| 40 | unsigned long address) |
| 41 | { |
| 42 | struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); |
| 43 | |
| 44 | pagetable_dtor(ptdesc); |
| 45 | pagetable_free(ptdesc); |
| 46 | } |
| 47 | |
| 48 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm) |
| 49 | { |
| 50 | struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0); |
| 51 | pte_t *pte; |
| 52 | |
| 53 | if (!ptdesc) |
| 54 | return NULL; |
| 55 | if (!pagetable_pte_ctor(mm, ptdesc)) { |
| 56 | pagetable_free(ptdesc); |
| 57 | return NULL; |
| 58 | } |
| 59 | |
| 60 | pte = ptdesc_address(ptdesc); |
| 61 | return pte; |
| 62 | } |
| 63 | |
| 64 | static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable) |
| 65 | { |
| 66 | struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); |
| 67 | |
| 68 | pagetable_dtor(ptdesc); |
| 69 | pagetable_free(ptdesc); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * In our implementation, each pgd entry contains 1 pmd that is never allocated |
| 74 | * or freed. pgd_present is always 1, so this should never be called. -NL |
| 75 | */ |
| 76 | #define pmd_free(mm, pmd) BUG() |
| 77 | |
| 78 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
| 79 | { |
| 80 | pagetable_dtor_free(virt_to_ptdesc(pgd)); |
| 81 | } |
| 82 | |
| 83 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
| 84 | { |
| 85 | pgd_t *new_pgd; |
| 86 | struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_NOWARN) & |
| 87 | ~__GFP_HIGHMEM, 0); |
| 88 | |
| 89 | if (!ptdesc) |
| 90 | return NULL; |
| 91 | pagetable_pgd_ctor(ptdesc); |
| 92 | new_pgd = ptdesc_address(ptdesc); |
| 93 | |
| 94 | memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t)); |
| 95 | memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); |
| 96 | return new_pgd; |
| 97 | } |
| 98 | |
| 99 | #endif /* M68K_MCF_PGALLOC_H */ |
| 100 |
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