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
pte_free_kernel(struct mm_struct * mm,pte_t * pte)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
pte_alloc_one_kernel(struct mm_struct * mm)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
pmd_alloc_kernel(pgd_t * pgd,unsigned long address)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
__pte_free_tlb(struct mmu_gather * tlb,pgtable_t pgtable,unsigned long address)35 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
36 unsigned long address)
37 {
38 struct page *page = virt_to_page(pgtable);
39
40 pgtable_pte_page_dtor(page);
41 __free_page(page);
42 }
43
pte_alloc_one(struct mm_struct * mm)44 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
45 {
46 struct page *page = alloc_pages(GFP_DMA, 0);
47 pte_t *pte;
48
49 if (!page)
50 return NULL;
51 if (!pgtable_pte_page_ctor(page)) {
52 __free_page(page);
53 return NULL;
54 }
55
56 pte = page_address(page);
57 clear_page(pte);
58
59 return pte;
60 }
61
pte_free(struct mm_struct * mm,pgtable_t pgtable)62 static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
63 {
64 struct page *page = virt_to_page(pgtable);
65
66 pgtable_pte_page_dtor(page);
67 __free_page(page);
68 }
69
70 /*
71 * In our implementation, each pgd entry contains 1 pmd that is never allocated
72 * or freed. pgd_present is always 1, so this should never be called. -NL
73 */
74 #define pmd_free(mm, pmd) BUG()
75
pgd_free(struct mm_struct * mm,pgd_t * pgd)76 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
77 {
78 free_page((unsigned long) pgd);
79 }
80
pgd_alloc(struct mm_struct * mm)81 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
82 {
83 pgd_t *new_pgd;
84
85 new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
86 if (!new_pgd)
87 return NULL;
88 memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
89 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
90 return new_pgd;
91 }
92
93 #endif /* M68K_MCF_PGALLOC_H */
94