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 /* FIXME - when we get this compiling */
16 /* erm, now that it's compiling, what do we do with it? */
17 #define _KERNPG_TABLE 0
18 
19 extern const char bad_pmd_string[];
20 
21 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
22 
23 
24 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
25 {
26         free_page((unsigned long) pte);
27 }
28 
29 static inline void pte_free(struct mm_struct *mm, pgtable_t page)
30 {
31 	pgtable_page_dtor(page);
32         __free_page(page);
33 }
34 
35 #define __pte_free_tlb(tlb,pte,addr)			\
36 do {							\
37 	pgtable_page_dtor(pte);				\
38 	tlb_remove_page((tlb), pte);			\
39 } while (0)
40 
41 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
42 					  unsigned long address)
43 {
44 	unsigned long page = __get_free_page(GFP_KERNEL|__GFP_REPEAT);
45 
46 	if (!page)
47 		return NULL;
48 
49 	memset((void *)page, 0, PAGE_SIZE);
50 	return (pte_t *) (page);
51 }
52 
53 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
54 					unsigned long address)
55 {
56         struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
57 
58 	if (page == NULL)
59 		return NULL;
60 
61 	clear_highpage(page);
62 	if (!pgtable_page_ctor(page)) {
63 		__free_page(page);
64 		return NULL;
65 	}
66 	return page;
67 
68 }
69 
70 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
71 {
72 	pmd_val(*pmd) = __pa((unsigned long)pte);
73 }
74 
75 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
76 {
77 	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
78 }
79 #define pmd_pgtable(pmd) pmd_page(pmd)
80 
81 /*
82  * allocating and freeing a pmd is trivial: the 1-entry pmd is
83  * inside the pgd, so has no extra memory associated with it.
84  */
85 #define pmd_free(mm, x)			do { } while (0)
86 #define __pmd_free_tlb(tlb, x, addr)	do { } while (0)
87 
88 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
89 {
90         free_page((unsigned long) pgd);
91 }
92 
93 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
94 {
95      pgd_t *new_pgd;
96 
97      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
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 /* SUN3_PGALLOC_H */
106