1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9 #ifndef _ASM_PGALLOC_H
10 #define _ASM_PGALLOC_H
11
12 #include <linux/highmem.h>
13 #include <linux/mm.h>
14 #include <linux/sched.h>
15
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)16 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
17 pte_t *pte)
18 {
19 set_pmd(pmd, __pmd((unsigned long)pte));
20 }
21
pmd_populate(struct mm_struct * mm,pmd_t * pmd,pgtable_t pte)22 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
23 pgtable_t pte)
24 {
25 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
26 }
27 #define pmd_pgtable(pmd) pmd_page(pmd)
28
29 /*
30 * Initialize a new pmd table with invalid pointers.
31 */
32 extern void pmd_init(unsigned long page, unsigned long pagetable);
33
34 #ifndef __PAGETABLE_PMD_FOLDED
35
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)36 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
37 {
38 set_pud(pud, __pud((unsigned long)pmd));
39 }
40 #endif
41
42 /*
43 * Initialize a new pgd / pmd table with invalid pointers.
44 */
45 extern void pgd_init(unsigned long page);
46 extern pgd_t *pgd_alloc(struct mm_struct *mm);
47
pgd_free(struct mm_struct * mm,pgd_t * pgd)48 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
49 {
50 free_pages((unsigned long)pgd, PGD_ORDER);
51 }
52
pte_alloc_one_kernel(struct mm_struct * mm,unsigned long address)53 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
54 unsigned long address)
55 {
56 return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
57 }
58
pte_alloc_one(struct mm_struct * mm,unsigned long address)59 static inline struct page *pte_alloc_one(struct mm_struct *mm,
60 unsigned long address)
61 {
62 struct page *pte;
63
64 pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
65 if (!pte)
66 return NULL;
67 clear_highpage(pte);
68 if (!pgtable_page_ctor(pte)) {
69 __free_page(pte);
70 return NULL;
71 }
72 return pte;
73 }
74
pte_free_kernel(struct mm_struct * mm,pte_t * pte)75 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
76 {
77 free_pages((unsigned long)pte, PTE_ORDER);
78 }
79
pte_free(struct mm_struct * mm,pgtable_t pte)80 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
81 {
82 pgtable_page_dtor(pte);
83 __free_pages(pte, PTE_ORDER);
84 }
85
86 #define __pte_free_tlb(tlb,pte,address) \
87 do { \
88 pgtable_page_dtor(pte); \
89 tlb_remove_page((tlb), pte); \
90 } while (0)
91
92 #ifndef __PAGETABLE_PMD_FOLDED
93
pmd_alloc_one(struct mm_struct * mm,unsigned long address)94 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
95 {
96 pmd_t *pmd;
97
98 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);
99 if (pmd)
100 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
101 return pmd;
102 }
103
pmd_free(struct mm_struct * mm,pmd_t * pmd)104 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
105 {
106 free_pages((unsigned long)pmd, PMD_ORDER);
107 }
108
109 #define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
110
111 #endif
112
113 #ifndef __PAGETABLE_PUD_FOLDED
114
pud_alloc_one(struct mm_struct * mm,unsigned long address)115 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
116 {
117 pud_t *pud;
118
119 pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER);
120 if (pud)
121 pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
122 return pud;
123 }
124
pud_free(struct mm_struct * mm,pud_t * pud)125 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
126 {
127 free_pages((unsigned long)pud, PUD_ORDER);
128 }
129
pgd_populate(struct mm_struct * mm,pgd_t * pgd,pud_t * pud)130 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
131 {
132 set_pgd(pgd, __pgd((unsigned long)pud));
133 }
134
135 #define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x)
136
137 #endif /* __PAGETABLE_PUD_FOLDED */
138
139 #define check_pgt_cache() do { } while (0)
140
141 extern void pagetable_init(void);
142
143 #endif /* _ASM_PGALLOC_H */
144