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pgalloc.h
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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 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 
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 
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 
47 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
48 {
49  pgd_t *ret, *init;
50 
52  if (ret) {
53  init = pgd_offset(&init_mm, 0UL);
54  pgd_init((unsigned long)ret);
56  (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
57  }
58 
59  return ret;
60 }
61 
62 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
63 {
64  free_pages((unsigned long)pgd, PGD_ORDER);
65 }
66 
67 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
68  unsigned long address)
69 {
70  pte_t *pte;
71 
73 
74  return pte;
75 }
76 
77 static inline struct page *pte_alloc_one(struct mm_struct *mm,
78  unsigned long address)
79 {
80  struct page *pte;
81 
83  if (pte) {
84  clear_highpage(pte);
85  pgtable_page_ctor(pte);
86  }
87  return pte;
88 }
89 
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 
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,address) \
102 do { \
103  pgtable_page_dtor(pte); \
104  tlb_remove_page((tlb), pte); \
105 } while (0)
106 
107 #ifndef __PAGETABLE_PMD_FOLDED
108 
109 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
110 {
111  pmd_t *pmd;
112 
114  if (pmd)
115  pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
116  return pmd;
117 }
118 
119 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
120 {
121  free_pages((unsigned long)pmd, PMD_ORDER);
122 }
123 
124 #define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
125 
126 #endif
127 
128 #define check_pgt_cache() do { } while (0)
129 
130 extern void pagetable_init(void);
131 
132 #endif /* _ASM_PGALLOC_H */