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 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 9 { 10 pagetable_free(virt_to_ptdesc(pte)); 11 } 12 13 extern const char bad_pmd_string[]; 14 15 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 16 { 17 struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_ZERO) & 18 ~__GFP_HIGHMEM, 0); 19 20 if (!ptdesc) 21 return NULL; 22 23 return ptdesc_address(ptdesc); 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 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable, 36 unsigned long address) 37 { 38 struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); 39 40 pagetable_pte_dtor(ptdesc); 41 pagetable_free(ptdesc); 42 } 43 44 static inline pgtable_t pte_alloc_one(struct mm_struct *mm) 45 { 46 struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0); 47 pte_t *pte; 48 49 if (!ptdesc) 50 return NULL; 51 if (!pagetable_pte_ctor(ptdesc)) { 52 pagetable_free(ptdesc); 53 return NULL; 54 } 55 56 pte = ptdesc_address(ptdesc); 57 return pte; 58 } 59 60 static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable) 61 { 62 struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); 63 64 pagetable_pte_dtor(ptdesc); 65 pagetable_free(ptdesc); 66 } 67 68 /* 69 * In our implementation, each pgd entry contains 1 pmd that is never allocated 70 * or freed. pgd_present is always 1, so this should never be called. -NL 71 */ 72 #define pmd_free(mm, pmd) BUG() 73 74 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 75 { 76 pagetable_free(virt_to_ptdesc(pgd)); 77 } 78 79 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 80 { 81 pgd_t *new_pgd; 82 struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_NOWARN) & 83 ~__GFP_HIGHMEM, 0); 84 85 if (!ptdesc) 86 return NULL; 87 new_pgd = ptdesc_address(ptdesc); 88 89 memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t)); 90 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); 91 return new_pgd; 92 } 93 94 #endif /* M68K_MCF_PGALLOC_H */ 95