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/config.h>
13#include <linux/highmem.h>
14#include <linux/mm.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 struct page *pte)
24{
25 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
26}
27
28/*
29 * Initialize a new pgd / pmd table with invalid pointers.
30 */
31extern void pgd_init(unsigned long page);
32extern void pmd_init(unsigned long page, unsigned long pagetable);
33
34static inline pgd_t *pgd_alloc(struct mm_struct *mm)
35{
36 pgd_t *ret, *init;
37
38 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
39 if (ret) {
40 init = pgd_offset(&init_mm, 0);
41 pgd_init((unsigned long)ret);
42 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
43 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
44 }
45
46 return ret;
47}
48
49static inline void pgd_free(pgd_t *pgd)
50{
51 free_pages((unsigned long)pgd, PGD_ORDER);
52}
53
54static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
55 unsigned long address)
56{
57 pte_t *pte;
58
59 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
60
61 return pte;
62}
63
64static inline struct page *pte_alloc_one(struct mm_struct *mm,
65 unsigned long address)
66{
67 struct page *pte;
68
69 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
70 if (pte)
71 clear_highpage(pte);
72
73 return pte;
74}
75
76static inline void pte_free_kernel(pte_t *pte)
77{
78 free_pages((unsigned long)pte, PTE_ORDER);
79}
80
81static inline void pte_free(struct page *pte)
82{
83 __free_pages(pte, PTE_ORDER);
84}
85
86#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
87
88#ifdef CONFIG_MIPS32
89#define pgd_populate(mm, pmd, pte) BUG()
90
91/*
92 * allocating and freeing a pmd is trivial: the 1-entry pmd is
93 * inside the pgd, so has no extra memory associated with it.
94 */
95#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
96#define pmd_free(x) do { } while (0)
97#define __pmd_free_tlb(tlb,x) do { } while (0)
98#endif
99
100#ifdef CONFIG_MIPS64
101
102#define pgd_populate(mm, pgd, pmd) set_pgd(pgd, __pgd(pmd))
103
104static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
105{
106 pmd_t *pmd;
107
108 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
109 if (pmd)
110 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
111 return pmd;
112}
113
114static inline void pmd_free(pmd_t *pmd)
115{
116 free_pages((unsigned long)pmd, PMD_ORDER);
117}
118
119#define __pmd_free_tlb(tlb,x) pmd_free(x)
120
121#endif
122
123#define check_pgt_cache() do { } while (0)
124
125#endif /* _ASM_PGALLOC_H */