projects/linux·blob 61844250 · refs

143 lines · 3.1 KiB

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
16static 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
22static 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 */
32extern void pmd_init(unsigned long page, unsigned long pagetable);
33
34#ifdef CONFIG_64BIT
35
36static 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 */
45extern void pgd_init(unsigned long page);
46
47static 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
62static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
63{
64 free_pages((unsigned long)pgd, PGD_ORDER);
65}
66
67static 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
77static 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
90static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
91{
92 free_pages((unsigned long)pte, PTE_ORDER);
93}
94
95static 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) \
102do { \
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
120static 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
130static 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
141extern void pagetable_init(void);
142
143#endif /* _ASM_PGALLOC_H */