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 #ifdef CONFIG_64BIT
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
pgd_alloc(struct mm_struct * mm)47 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
48 {
49 pgd_t *ret, *init;
50
51 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
52 if (ret) {
53 init = pgd_offset(&init_mm, 0UL);
54 pgd_init((unsigned long)ret);
55 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
56 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
57 }
58
59 return ret;
60 }
61
pgd_free(struct mm_struct * mm,pgd_t * pgd)62 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
63 {
64 free_pages((unsigned long)pgd, PGD_ORDER);
65 }
66
pte_alloc_one_kernel(struct mm_struct * mm,unsigned long address)67 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
68 unsigned long address)
69 {
70 pte_t *pte;
71
72 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
73
74 return pte;
75 }
76
pte_alloc_one(struct mm_struct * mm,unsigned long address)77 static inline struct page *pte_alloc_one(struct mm_struct *mm,
78 unsigned long address)
79 {
80 struct page *pte;
81
82 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
83 if (pte) {
84 clear_highpage(pte);
85 pgtable_page_ctor(pte);
86 }
87 return pte;
88 }
89
pte_free_kernel(struct mm_struct * mm,pte_t * pte)90 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
91 {
92 free_pages((unsigned long)pte, PTE_ORDER);
93 }
94
pte_free(struct mm_struct * mm,pgtable_t pte)95 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
96 {
97 pgtable_page_dtor(pte);
98 __free_pages(pte, PTE_ORDER);
99 }
100
101 #define __pte_free_tlb(tlb,pte) \
102 do { \
103 pgtable_page_dtor(pte); \
104 tlb_remove_page((tlb), pte); \
105 } while (0)
106
107 #ifdef CONFIG_32BIT
108
109 /*
110 * allocating and freeing a pmd is trivial: the 1-entry pmd is
111 * inside the pgd, so has no extra memory associated with it.
112 */
113 #define pmd_free(mm, x) do { } while (0)
114 #define __pmd_free_tlb(tlb, x) do { } while (0)
115
116 #endif
117
118 #ifdef CONFIG_64BIT
119
pmd_alloc_one(struct mm_struct * mm,unsigned long address)120 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
121 {
122 pmd_t *pmd;
123
124 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
125 if (pmd)
126 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
127 return pmd;
128 }
129
pmd_free(struct mm_struct * mm,pmd_t * pmd)130 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
131 {
132 free_pages((unsigned long)pmd, PMD_ORDER);
133 }
134
135 #define __pmd_free_tlb(tlb, x) pmd_free((tlb)->mm, x)
136
137 #endif
138
139 #define check_pgt_cache() do { } while (0)
140
141 extern void pagetable_init(void);
142
143 #endif /* _ASM_PGALLOC_H */
144