projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 74d47992 GU |
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 | unsigned long address) | |
| 17 | { | |
| 32d6bd90 | 18 | unsigned long page = __get_free_page(GFP_DMA); |
| 74d47992 GU |
19 | |
| 20 | if (!page) | |
| 21 | return NULL; | |
| 22 | ||
| 23 | memset((void *)page, 0, PAGE_SIZE); | |
| 24 | return (pte_t *) (page); | |
| 25 | } | |
| 26 | ||
| 27 | extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address) | |
| 28 | { | |
| 29 | return (pmd_t *) pgd; | |
| 30 | } | |
| 31 | ||
| 32 | #define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); }) | |
| 33 | #define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); }) | |
| 34 | ||
| 35 | #define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr) | |
| 36 | ||
| 37 | #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \ | |
| 38 | (unsigned long)(page_address(page))) | |
| 39 | ||
| 40 | #define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte)) | |
| 41 | ||
| 42 | #define pmd_pgtable(pmd) pmd_page(pmd) | |
| 43 | ||
| 44 | static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page, | |
| 45 | unsigned long address) | |
| 46 | { | |
| 47 | __free_page(page); | |
| 48 | } | |
| 49 | ||
| 50 | #define __pmd_free_tlb(tlb, pmd, address) do { } while (0) | |
| 51 | ||
| 52 | static inline struct page *pte_alloc_one(struct mm_struct *mm, | |
| 53 | unsigned long address) | |
| 54 | { | |
| 32d6bd90 | 55 | struct page *page = alloc_pages(GFP_DMA, 0); |
| 74d47992 GU |
56 | pte_t *pte; |
| 57 | ||
| 58 | if (!page) | |
| 59 | return NULL; | |
| f84c914b KS |
60 | if (!pgtable_page_ctor(page)) { |
| 61 | __free_page(page); | |
| 62 | return NULL; | |
| 63 | } | |
| 74d47992 GU |
64 | |
| 65 | pte = kmap(page); | |
| 66 | if (pte) { | |
| 67 | clear_page(pte); | |
| 68 | __flush_page_to_ram(pte); | |
| 69 | flush_tlb_kernel_page(pte); | |
| 70 | nocache_page(pte); | |
| 71 | } | |
| 72 | kunmap(page); | |
| 73 | ||
| 74 | return page; | |
| 75 | } | |
| 76 | ||
| 77 | extern inline void pte_free(struct mm_struct *mm, struct page *page) | |
| 78 | { | |
| 79 | __free_page(page); | |
| 80 | } | |
| 81 | ||
| 82 | /* | |
| 83 | * In our implementation, each pgd entry contains 1 pmd that is never allocated | |
| 84 | * or freed. pgd_present is always 1, so this should never be called. -NL | |
| 85 | */ | |
| 86 | #define pmd_free(mm, pmd) BUG() | |
| 87 | ||
| 88 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
| 89 | { | |
| 90 | free_page((unsigned long) pgd); | |
| 91 | } | |
| 92 | ||
| 93 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) | |
| 94 | { | |
| 95 | pgd_t *new_pgd; | |
| 96 | ||
| 97 | new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN); | |
| 98 | if (!new_pgd) | |
| 99 | return NULL; | |
| 100 | memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE); | |
| 101 | memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); | |
| 102 | return new_pgd; | |
| 103 | } | |
| 104 | ||
| 105 | #define pgd_populate(mm, pmd, pte) BUG() | |
| 106 | ||
| 107 | #endif /* M68K_MCF_PGALLOC_H */ |