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,unsigned long address)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
pmd_alloc_kernel(pgd_t * pgd,unsigned long address)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
__pte_free_tlb(struct mmu_gather * tlb,pgtable_t page,unsigned long address)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
pte_alloc_one(struct mm_struct * mm,unsigned long address)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
pte_free(struct mm_struct * mm,struct page * page)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
pgd_free(struct mm_struct * mm,pgd_t * pgd)90 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
91 {
92 free_page((unsigned long) pgd);
93 }
94
pgd_alloc(struct mm_struct * mm)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
