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 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 
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 
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_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
32 #define pmd_alloc_one(mm, address)      ({ BUG(); ((pmd_t *)2); })
33 
34 #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
35 	(unsigned long)(page_address(page)))
36 
37 #define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
38 
39 #define pmd_pgtable(pmd) pmd_page(pmd)
40 
41 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
42 				  unsigned long address)
43 {
44 	pgtable_page_dtor(page);
45 	__free_page(page);
46 }
47 
48 #define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
49 
50 static inline struct page *pte_alloc_one(struct mm_struct *mm)
51 {
52 	struct page *page = alloc_pages(GFP_DMA, 0);
53 	pte_t *pte;
54 
55 	if (!page)
56 		return NULL;
57 	if (!pgtable_page_ctor(page)) {
58 		__free_page(page);
59 		return NULL;
60 	}
61 
62 	pte = kmap(page);
63 	if (pte) {
64 		clear_page(pte);
65 		__flush_page_to_ram(pte);
66 		flush_tlb_kernel_page(pte);
67 		nocache_page(pte);
68 	}
69 	kunmap(page);
70 
71 	return page;
72 }
73 
74 static inline void pte_free(struct mm_struct *mm, struct page *page)
75 {
76 	pgtable_page_dtor(page);
77 	__free_page(page);
78 }
79 
80 /*
81  * In our implementation, each pgd entry contains 1 pmd that is never allocated
82  * or freed.  pgd_present is always 1, so this should never be called. -NL
83  */
84 #define pmd_free(mm, pmd) BUG()
85 
86 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
87 {
88 	free_page((unsigned long) pgd);
89 }
90 
91 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
92 {
93 	pgd_t *new_pgd;
94 
95 	new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
96 	if (!new_pgd)
97 		return NULL;
98 	memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
99 	memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
100 	return new_pgd;
101 }
102 
103 #define pgd_populate(mm, pmd, pte) BUG()
104 
105 #endif /* M68K_MCF_PGALLOC_H */
106