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
16 #define __HAVE_ARCH_PMD_ALLOC_ONE
17 #define __HAVE_ARCH_PUD_ALLOC_ONE
18 #define __HAVE_ARCH_PGD_FREE
19 #include <asm-generic/pgalloc.h>
20
21 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
22 pte_t *pte)
23 {
24 set_pmd(pmd, __pmd((unsigned long)pte));
25 }
26
27 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
28 pgtable_t pte)
29 {
30 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
31 }
32
33 /*
34 * Initialize a new pmd table with invalid pointers.
35 */
36 extern void pmd_init(void *addr);
37
38 #ifndef __PAGETABLE_PMD_FOLDED
39
40 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
41 {
42 set_pud(pud, __pud((unsigned long)pmd));
43 }
44 #endif
45
46 /*
47 * Initialize a new pgd table with invalid pointers.
48 */
49 extern void pgd_init(void *addr);
50 extern pgd_t *pgd_alloc(struct mm_struct *mm);
51
52 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
53 {
54 pagetable_free(virt_to_ptdesc(pgd));
55 }
56
57 #define __pte_free_tlb(tlb, pte, address) \
58 do { \
59 pagetable_pte_dtor(page_ptdesc(pte)); \
60 tlb_remove_page_ptdesc((tlb), page_ptdesc(pte)); \
61 } while (0)
62
63 #ifndef __PAGETABLE_PMD_FOLDED
64
65 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
66 {
67 pmd_t *pmd;
68 struct ptdesc *ptdesc;
69
70 ptdesc = pagetable_alloc(GFP_KERNEL_ACCOUNT, PMD_TABLE_ORDER);
71 if (!ptdesc)
72 return NULL;
73
74 if (!pagetable_pmd_ctor(ptdesc)) {
75 pagetable_free(ptdesc);
76 return NULL;
77 }
78
79 pmd = ptdesc_address(ptdesc);
80 pmd_init(pmd);
81 return pmd;
82 }
83
84 #define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
85
86 #endif
87
88 #ifndef __PAGETABLE_PUD_FOLDED
89
90 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
91 {
92 pud_t *pud;
93 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM,
94 PUD_TABLE_ORDER);
95
96 if (!ptdesc)
97 return NULL;
98 pagetable_pud_ctor(ptdesc);
99 pud = ptdesc_address(ptdesc);
100
101 pud_init(pud);
102 return pud;
103 }
104
105 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
106 {
107 set_p4d(p4d, __p4d((unsigned long)pud));
108 }
109
110 #define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x)
111
112 #endif /* __PAGETABLE_PUD_FOLDED */
113
114 extern void pagetable_init(void);
115
116 #endif /* _ASM_PGALLOC_H */
117
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