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_dtor_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 if (!pagetable_pte_ctor(mm, ptdesc)) { 23 pagetable_free(ptdesc); 24 return NULL; 25 } 26 27 return ptdesc_address(ptdesc); 28 } 29 30 extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address) 31 { 32 return (pmd_t *) pgd; 33 } 34 35 #define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte)) 36 37 #define pmd_populate_kernel pmd_populate 38 39 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable, 40 unsigned long address) 41 { 42 struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); 43 44 pagetable_dtor(ptdesc); 45 pagetable_free(ptdesc); 46 } 47 48 static inline pgtable_t pte_alloc_one(struct mm_struct *mm) 49 { 50 struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0); 51 pte_t *pte; 52 53 if (!ptdesc) 54 return NULL; 55 if (!pagetable_pte_ctor(mm, ptdesc)) { 56 pagetable_free(ptdesc); 57 return NULL; 58 } 59 60 pte = ptdesc_address(ptdesc); 61 return pte; 62 } 63 64 static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable) 65 { 66 struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); 67 68 pagetable_dtor(ptdesc); 69 pagetable_free(ptdesc); 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 pagetable_dtor_free(virt_to_ptdesc(pgd)); 81 } 82 83 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 84 { 85 pgd_t *new_pgd; 86 struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_NOWARN) & 87 ~__GFP_HIGHMEM, 0); 88 89 if (!ptdesc) 90 return NULL; 91 pagetable_pgd_ctor(ptdesc); 92 new_pgd = ptdesc_address(ptdesc); 93 94 memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t)); 95 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); 96 return new_pgd; 97 } 98 99 #endif /* M68K_MCF_PGALLOC_H */ 100