1 /* sun3_pgalloc.h --
2  * reorganization around 2.3.39, routines moved from sun3_pgtable.h
3  *
4  *
5  * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
6  *
7  * moved 1/26/2000 Sam Creasey
8  */
9 
10 #ifndef _SUN3_PGALLOC_H
11 #define _SUN3_PGALLOC_H
12 
13 #include <asm/tlb.h>
14 
15 extern const char bad_pmd_string[];
16 
17 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
18 
19 
20 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
21 {
22         free_page((unsigned long) pte);
23 }
24 
25 static inline void pte_free(struct mm_struct *mm, pgtable_t page)
26 {
27 	pgtable_page_dtor(page);
28         __free_page(page);
29 }
30 
31 #define __pte_free_tlb(tlb,pte,addr)			\
32 do {							\
33 	pgtable_page_dtor(pte);				\
34 	tlb_remove_page((tlb), pte);			\
35 } while (0)
36 
37 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
38 					  unsigned long address)
39 {
40 	unsigned long page = __get_free_page(GFP_KERNEL);
41 
42 	if (!page)
43 		return NULL;
44 
45 	memset((void *)page, 0, PAGE_SIZE);
46 	return (pte_t *) (page);
47 }
48 
49 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
50 					unsigned long address)
51 {
52         struct page *page = alloc_pages(GFP_KERNEL, 0);
53 
54 	if (page == NULL)
55 		return NULL;
56 
57 	clear_highpage(page);
58 	if (!pgtable_page_ctor(page)) {
59 		__free_page(page);
60 		return NULL;
61 	}
62 	return page;
63 
64 }
65 
66 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
67 {
68 	pmd_val(*pmd) = __pa((unsigned long)pte);
69 }
70 
71 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
72 {
73 	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
74 }
75 #define pmd_pgtable(pmd) pmd_page(pmd)
76 
77 /*
78  * allocating and freeing a pmd is trivial: the 1-entry pmd is
79  * inside the pgd, so has no extra memory associated with it.
80  */
81 #define pmd_free(mm, x)			do { } while (0)
82 #define __pmd_free_tlb(tlb, x, addr)	do { } while (0)
83 
84 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
85 {
86         free_page((unsigned long) pgd);
87 }
88 
89 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
90 {
91      pgd_t *new_pgd;
92 
93      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
94      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
95      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
96      return new_pgd;
97 }
98 
99 #define pgd_populate(mm, pmd, pte) BUG()
100 
101 #endif /* SUN3_PGALLOC_H */
102