1 #ifndef M68K_MCF_PGALLOC_H
2 #define M68K_MCF_PGALLOC_H
3 
4 #include <asm/tlb.h>
5 #include <asm/tlbflush.h>
6 
7 extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
8 {
9 	free_page((unsigned long) pte);
10 }
11 
12 extern const char bad_pmd_string[];
13 
14 extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
15 	unsigned long address)
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 pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
35 
36 #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
37 	(unsigned long)(page_address(page)))
38 
39 #define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
40 
41 #define pmd_pgtable(pmd) pmd_page(pmd)
42 
43 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
44 				  unsigned long address)
45 {
46 	__free_page(page);
47 }
48 
49 #define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
50 
51 static inline struct page *pte_alloc_one(struct mm_struct *mm,
52 	unsigned long address)
53 {
54 	struct page *page = alloc_pages(GFP_DMA, 0);
55 	pte_t *pte;
56 
57 	if (!page)
58 		return NULL;
59 	if (!pgtable_page_ctor(page)) {
60 		__free_page(page);
61 		return NULL;
62 	}
63 
64 	pte = kmap(page);
65 	if (pte) {
66 		clear_page(pte);
67 		__flush_page_to_ram(pte);
68 		flush_tlb_kernel_page(pte);
69 		nocache_page(pte);
70 	}
71 	kunmap(page);
72 
73 	return page;
74 }
75 
76 extern inline void pte_free(struct mm_struct *mm, struct page *page)
77 {
78 	__free_page(page);
79 }
80 
81 /*
82  * In our implementation, each pgd entry contains 1 pmd that is never allocated
83  * or freed.  pgd_present is always 1, so this should never be called. -NL
84  */
85 #define pmd_free(mm, pmd) BUG()
86 
87 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
88 {
89 	free_page((unsigned long) pgd);
90 }
91 
92 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
93 {
94 	pgd_t *new_pgd;
95 
96 	new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
97 	if (!new_pgd)
98 		return NULL;
99 	memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
100 	memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
101 	return new_pgd;
102 }
103 
104 #define pgd_populate(mm, pmd, pte) BUG()
105 
106 #endif /* M68K_MCF_PGALLOC_H */
107