| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| 9 | { |
| 10 | free_page((unsigned long) pte); |
| 11 | } |
| 12 | |
| 13 | extern const char bad_pmd_string[]; |
| 14 | |
| 15 | extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) |
| 16 | { |
| 17 | unsigned long page = __get_free_page(GFP_DMA); |
| 18 | |
| 19 | if (!page) |
| 20 | return NULL; |
| 21 | |
| 22 | memset((void *)page, 0, PAGE_SIZE); |
| 23 | return (pte_t *) (page); |
| 24 | } |
| 25 | |
| 26 | extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address) |
| 27 | { |
| 28 | return (pmd_t *) pgd; |
| 29 | } |
| 30 | |
| 31 | #define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); }) |
| 32 | #define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); }) |
| 33 | |
| 34 | #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \ |
| 35 | (unsigned long)(page_address(page))) |
| 36 | |
| 37 | #define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte)) |
| 38 | |
| 39 | #define pmd_pgtable(pmd) pmd_page(pmd) |
| 40 | |
| 41 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page, |
| 42 | unsigned long address) |
| 43 | { |
| 44 | pgtable_pte_page_dtor(page); |
| 45 | __free_page(page); |
| 46 | } |
| 47 | |
| 48 | #define __pmd_free_tlb(tlb, pmd, address) do { } while (0) |
| 49 | |
| 50 | static inline struct page *pte_alloc_one(struct mm_struct *mm) |
| 51 | { |
| 52 | struct page *page = alloc_pages(GFP_DMA, 0); |
| 53 | pte_t *pte; |
| 54 | |
| 55 | if (!page) |
| 56 | return NULL; |
| 57 | if (!pgtable_pte_page_ctor(page)) { |
| 58 | __free_page(page); |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | pte = kmap(page); |
| 63 | if (pte) { |
| 64 | clear_page(pte); |
| 65 | __flush_page_to_ram(pte); |
| 66 | flush_tlb_kernel_page(pte); |
| 67 | nocache_page(pte); |
| 68 | } |
| 69 | kunmap(page); |
| 70 | |
| 71 | return page; |
| 72 | } |
| 73 | |
| 74 | static inline void pte_free(struct mm_struct *mm, struct page *page) |
| 75 | { |
| 76 | pgtable_pte_page_dtor(page); |
| 77 | __free_page(page); |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * In our implementation, each pgd entry contains 1 pmd that is never allocated |
| 82 | * or freed. pgd_present is always 1, so this should never be called. -NL |
| 83 | */ |
| 84 | #define pmd_free(mm, pmd) BUG() |
| 85 | |
| 86 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
| 87 | { |
| 88 | free_page((unsigned long) pgd); |
| 89 | } |
| 90 | |
| 91 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
| 92 | { |
| 93 | pgd_t *new_pgd; |
| 94 | |
| 95 | new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN); |
| 96 | if (!new_pgd) |
| 97 | return NULL; |
| 98 | memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE); |
| 99 | memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); |
| 100 | return new_pgd; |
| 101 | } |
| 102 | |
| 103 | #define pgd_populate(mm, pmd, pte) BUG() |
| 104 | |
| 105 | #endif /* M68K_MCF_PGALLOC_H */ |