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