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_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_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_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 */ 106