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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.