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sun3_pgalloc.h
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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 {
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 {
57 
58  if (page == NULL)
59  return NULL;
60 
61  clear_highpage(page);
62  pgtable_page_ctor(page);
63  return page;
64 
65 }
66 
67 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
68 {
69  pmd_val(*pmd) = __pa((unsigned long)pte);
70 }
71 
72 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
73 {
74  pmd_val(*pmd) = __pa((unsigned long)page_address(page));
75 }
76 #define pmd_pgtable(pmd) pmd_page(pmd)
77 
78 /*
79  * allocating and freeing a pmd is trivial: the 1-entry pmd is
80  * inside the pgd, so has no extra memory associated with it.
81  */
82 #define pmd_free(mm, x) do { } while (0)
83 #define __pmd_free_tlb(tlb, x, addr) do { } while (0)
84 
85 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
86 {
87  free_page((unsigned long) pgd);
88 }
89 
90 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
91 {
92  pgd_t *new_pgd;
93 
94  new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
95  memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
96  memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
97  return new_pgd;
98 }
99 
100 #define pgd_populate(mm, pmd, pte) BUG()
101 
102 #endif /* SUN3_PGALLOC_H */