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 unsigned long address) 17 { 18 unsigned long page = __get_free_page(GFP_DMA); 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 pgtable_page_dtor(page); 48 __free_page(page); 49 } 50 51 #define __pmd_free_tlb(tlb, pmd, address) do { } while (0) 52 53 static inline struct page *pte_alloc_one(struct mm_struct *mm, 54 unsigned long address) 55 { 56 struct page *page = alloc_pages(GFP_DMA, 0); 57 pte_t *pte; 58 59 if (!page) 60 return NULL; 61 if (!pgtable_page_ctor(page)) { 62 __free_page(page); 63 return NULL; 64 } 65 66 pte = kmap(page); 67 if (pte) { 68 clear_page(pte); 69 __flush_page_to_ram(pte); 70 flush_tlb_kernel_page(pte); 71 nocache_page(pte); 72 } 73 kunmap(page); 74 75 return page; 76 } 77 78 static inline void pte_free(struct mm_struct *mm, struct page *page) 79 { 80 pgtable_page_dtor(page); 81 __free_page(page); 82 } 83 84 /* 85 * In our implementation, each pgd entry contains 1 pmd that is never allocated 86 * or freed. pgd_present is always 1, so this should never be called. -NL 87 */ 88 #define pmd_free(mm, pmd) BUG() 89 90 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 91 { 92 free_page((unsigned long) pgd); 93 } 94 95 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 96 { 97 pgd_t *new_pgd; 98 99 new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN); 100 if (!new_pgd) 101 return NULL; 102 memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE); 103 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); 104 return new_pgd; 105 } 106 107 #define pgd_populate(mm, pmd, pte) BUG() 108 109 #endif /* M68K_MCF_PGALLOC_H */ 110