Linux kernel mirror (for testing)
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linux
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
15static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
16 pte_t *pte)
17{
18 set_pmd(pmd, __pmd((unsigned long)pte));
19}
20
21static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
22 struct page *pte)
23{
24 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
25}
26
27/*
28 * Initialize a new pmd table with invalid pointers.
29 */
30extern void pmd_init(unsigned long page, unsigned long pagetable);
31
32#ifdef CONFIG_64BIT
33
34static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
35{
36 set_pud(pud, __pud((unsigned long)pmd));
37}
38#endif
39
40/*
41 * Initialize a new pgd / pmd table with invalid pointers.
42 */
43extern void pgd_init(unsigned long page);
44
45static inline pgd_t *pgd_alloc(struct mm_struct *mm)
46{
47 pgd_t *ret, *init;
48
49 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
50 if (ret) {
51 init = pgd_offset(&init_mm, 0UL);
52 pgd_init((unsigned long)ret);
53 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
54 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
55 }
56
57 return ret;
58}
59
60static inline void pgd_free(pgd_t *pgd)
61{
62 free_pages((unsigned long)pgd, PGD_ORDER);
63}
64
65static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
66 unsigned long address)
67{
68 pte_t *pte;
69
70 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
71
72 return pte;
73}
74
75static inline struct page *pte_alloc_one(struct mm_struct *mm,
76 unsigned long address)
77{
78 struct page *pte;
79
80 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
81 if (pte)
82 clear_highpage(pte);
83
84 return pte;
85}
86
87static inline void pte_free_kernel(pte_t *pte)
88{
89 free_pages((unsigned long)pte, PTE_ORDER);
90}
91
92static inline void pte_free(struct page *pte)
93{
94 __free_pages(pte, PTE_ORDER);
95}
96
97#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
98
99#ifdef CONFIG_32BIT
100
101/*
102 * allocating and freeing a pmd is trivial: the 1-entry pmd is
103 * inside the pgd, so has no extra memory associated with it.
104 */
105#define pmd_free(x) do { } while (0)
106#define __pmd_free_tlb(tlb,x) do { } while (0)
107
108#endif
109
110#ifdef CONFIG_64BIT
111
112static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
113{
114 pmd_t *pmd;
115
116 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
117 if (pmd)
118 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
119 return pmd;
120}
121
122static inline void pmd_free(pmd_t *pmd)
123{
124 free_pages((unsigned long)pmd, PMD_ORDER);
125}
126
127#define __pmd_free_tlb(tlb,x) pmd_free(x)
128
129#endif
130
131#define check_pgt_cache() do { } while (0)
132
133extern void pagetable_init(void);
134
135#endif /* _ASM_PGALLOC_H */