blob: 81b72122207ad47a8dc09118c1dae1f0d9bebf65 [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,
23 struct page *pte)
24{
25 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
26}
27
28/*
Ralf Baechlec6e8b582005-02-10 12:19:59 +000029 * Initialize a new pmd table with invalid pointers.
30 */
31extern void pmd_init(unsigned long page, unsigned long pagetable);
32
33#ifdef CONFIG_64BIT
34
35static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
36{
37 set_pud(pud, __pud((unsigned long)pmd));
38}
39#endif
40
41/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * Initialize a new pgd / pmd table with invalid pointers.
43 */
44extern void pgd_init(unsigned long page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46static inline pgd_t *pgd_alloc(struct mm_struct *mm)
47{
48 pgd_t *ret, *init;
49
50 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
51 if (ret) {
Ralf Baechle242954b2006-10-24 02:29:01 +010052 init = pgd_offset(&init_mm, 0UL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 pgd_init((unsigned long)ret);
54 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
55 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
56 }
57
58 return ret;
59}
60
61static inline void pgd_free(pgd_t *pgd)
62{
63 free_pages((unsigned long)pgd, PGD_ORDER);
64}
65
66static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
67 unsigned long address)
68{
69 pte_t *pte;
70
71 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
72
73 return pte;
74}
75
76static inline struct page *pte_alloc_one(struct mm_struct *mm,
77 unsigned long address)
78{
79 struct page *pte;
80
81 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
82 if (pte)
83 clear_highpage(pte);
84
85 return pte;
86}
87
88static inline void pte_free_kernel(pte_t *pte)
89{
90 free_pages((unsigned long)pte, PTE_ORDER);
91}
92
93static inline void pte_free(struct page *pte)
94{
95 __free_pages(pte, PTE_ORDER);
96}
97
Ralf Baechle21a151d2007-10-11 23:46:15 +010098#define __pte_free_tlb(tlb, pte) tlb_remove_page((tlb), (pte))
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Ralf Baechle875d43e2005-09-03 15:56:16 -0700100#ifdef CONFIG_32BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102/*
103 * allocating and freeing a pmd is trivial: the 1-entry pmd is
104 * inside the pgd, so has no extra memory associated with it.
105 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#define pmd_free(x) do { } while (0)
Ralf Baechle21a151d2007-10-11 23:46:15 +0100107#define __pmd_free_tlb(tlb, x) do { } while (0)
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#endif
110
Ralf Baechle875d43e2005-09-03 15:56:16 -0700111#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
114{
115 pmd_t *pmd;
116
117 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
118 if (pmd)
119 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
120 return pmd;
121}
122
123static inline void pmd_free(pmd_t *pmd)
124{
125 free_pages((unsigned long)pmd, PMD_ORDER);
126}
127
Ralf Baechle21a151d2007-10-11 23:46:15 +0100128#define __pmd_free_tlb(tlb, x) pmd_free(x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130#endif
131
132#define check_pgt_cache() do { } while (0)
133
Atsushi Nemoto6a1e5522007-02-19 01:27:34 +0900134extern void pagetable_init(void);
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#endif /* _ASM_PGALLOC_H */