blob: 1275831dda29b65ae90d2046f781a747cb4a3df0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/highmem.h>
13#include <linux/mm.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040014#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
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,
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080023 pgtable_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024{
25 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
26}
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080027#define pmd_pgtable(pmd) pmd_page(pmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29/*
Ralf Baechlec6e8b582005-02-10 12:19:59 +000030 * 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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 * Initialize a new pgd / pmd table with invalid pointers.
44 */
45extern void pgd_init(unsigned long page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
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) {
Ralf Baechle242954b2006-10-24 02:29:01 +010053 init = pgd_offset(&init_mm, 0UL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 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
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -080062static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
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);
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080083 if (pte) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 clear_highpage(pte);
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080085 pgtable_page_ctor(pte);
86 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 return pte;
88}
89
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -080090static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
92 free_pages((unsigned long)pte, PTE_ORDER);
93}
94
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080095static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080097 pgtable_page_dtor(pte);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 __free_pages(pte, PTE_ORDER);
99}
100
Martin Schwidefsky2f569af2008-02-08 04:22:04 -0800101#define __pte_free_tlb(tlb,pte) \
102do { \
103 pgtable_page_dtor(pte); \
104 tlb_remove_page((tlb), pte); \
105} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Ralf Baechle875d43e2005-09-03 15:56:16 -0700107#ifdef CONFIG_32BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
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 */
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -0800113#define pmd_free(mm, x) do { } while (0)
Ralf Baechle21a151d2007-10-11 23:46:15 +0100114#define __pmd_free_tlb(tlb, x) do { } while (0)
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116#endif
117
Ralf Baechle875d43e2005-09-03 15:56:16 -0700118#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120static 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
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -0800130static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 free_pages((unsigned long)pmd, PMD_ORDER);
133}
134
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -0800135#define __pmd_free_tlb(tlb, x) pmd_free((tlb)->mm, x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137#endif
138
139#define check_pgt_cache() do { } while (0)
140
Atsushi Nemoto6a1e5522007-02-19 01:27:34 +0900141extern void pagetable_init(void);
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143#endif /* _ASM_PGALLOC_H */