1 /*
2 * Copyright (C) 2004-2006 Atmel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8 #ifndef __ASM_AVR32_PGALLOC_H
9 #define __ASM_AVR32_PGALLOC_H
10
11 #include <linux/mm.h>
12 #include <linux/quicklist.h>
13 #include <asm/page.h>
14 #include <asm/pgtable.h>
15
16 #define QUICK_PGD 0 /* Preserve kernel mappings over free */
17 #define QUICK_PT 1 /* Zero on free */
18
19 static inline void pmd_populate_kernel(struct mm_struct *mm,
20 pmd_t *pmd, pte_t *pte)
21 {
22 set_pmd(pmd, __pmd((unsigned long)pte));
23 }
24
25 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
26 pgtable_t pte)
27 {
28 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
29 }
30 #define pmd_pgtable(pmd) pmd_page(pmd)
31
32 static inline void pgd_ctor(void *x)
33 {
34 pgd_t *pgd = x;
35
36 memcpy(pgd + USER_PTRS_PER_PGD,
37 swapper_pg_dir + USER_PTRS_PER_PGD,
38 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
39 }
40
41 /*
42 * Allocate and free page tables
43 */
44 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
45 {
46 return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
47 }
48
49 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
50 {
51 quicklist_free(QUICK_PGD, NULL, pgd);
52 }
53
54 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
55 unsigned long address)
56 {
57 return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
58 }
59
60 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
61 unsigned long address)
62 {
63 struct page *page;
64 void *pg;
65
66 pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
67 if (!pg)
68 return NULL;
69
70 page = virt_to_page(pg);
71 if (!pgtable_page_ctor(page)) {
72 quicklist_free(QUICK_PT, NULL, pg);
73 return NULL;
74 }
75
76 return page;
77 }
78
79 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
80 {
81 quicklist_free(QUICK_PT, NULL, pte);
82 }
83
84 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
85 {
86 pgtable_page_dtor(pte);
87 quicklist_free_page(QUICK_PT, NULL, pte);
88 }
89
90 #define __pte_free_tlb(tlb,pte,addr) \
91 do { \
92 pgtable_page_dtor(pte); \
93 tlb_remove_page((tlb), pte); \
94 } while (0)
95
96 static inline void check_pgt_cache(void)
97 {
98 quicklist_trim(QUICK_PGD, NULL, 25, 16);
99 quicklist_trim(QUICK_PT, NULL, 25, 16);
100 }
101
102 #endif /* __ASM_AVR32_PGALLOC_H */
103
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