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_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte)) 32 33 #define pmd_populate_kernel pmd_populate 34 35 #define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT) 36 37 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable, 38 unsigned long address) 39 { 40 struct page *page = virt_to_page(pgtable); 41 42 pgtable_pte_page_dtor(page); 43 __free_page(page); 44 } 45 46 static inline pgtable_t pte_alloc_one(struct mm_struct *mm) 47 { 48 struct page *page = alloc_pages(GFP_DMA, 0); 49 pte_t *pte; 50 51 if (!page) 52 return NULL; 53 if (!pgtable_pte_page_ctor(page)) { 54 __free_page(page); 55 return NULL; 56 } 57 58 pte = page_address(page); 59 clear_page(pte); 60 61 return pte; 62 } 63 64 static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable) 65 { 66 struct page *page = virt_to_page(pgtable); 67 68 pgtable_pte_page_dtor(page); 69 __free_page(page); 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 free_page((unsigned long) pgd); 81 } 82 83 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 84 { 85 pgd_t *new_pgd; 86 87 new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN); 88 if (!new_pgd) 89 return NULL; 90 memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t)); 91 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); 92 return new_pgd; 93 } 94 95 #endif /* M68K_MCF_PGALLOC_H */ 96