1 /* MN10300 Page and page table/directory allocation
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11 #ifndef _ASM_PGALLOC_H
12 #define _ASM_PGALLOC_H
13
14 #include <asm/processor.h>
15 #include <asm/page.h>
16 #include <linux/threads.h>
17 #include <linux/mm.h> /* for struct page */
18
19 struct mm_struct;
20 struct page;
21
22 /* attach a page table to a PMD entry */
23 #define pmd_populate_kernel(mm, pmd, pte) \
24 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE))
25
26 static inline
pmd_populate(struct mm_struct * mm,pmd_t * pmd,struct page * pte)27 void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
28 {
29 set_pmd(pmd, __pmd((page_to_pfn(pte) << PAGE_SHIFT) | _PAGE_TABLE));
30 }
31 #define pmd_pgtable(pmd) pmd_page(pmd)
32
33 /*
34 * Allocate and free page tables.
35 */
36
37 extern pgd_t *pgd_alloc(struct mm_struct *);
38 extern void pgd_free(struct mm_struct *, pgd_t *);
39
40 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
41 extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
42
pte_free_kernel(struct mm_struct * mm,pte_t * pte)43 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
44 {
45 free_page((unsigned long) pte);
46 }
47
pte_free(struct mm_struct * mm,struct page * pte)48 static inline void pte_free(struct mm_struct *mm, struct page *pte)
49 {
50 __free_page(pte);
51 }
52
53
54 #define __pte_free_tlb(tlb, pte) tlb_remove_page((tlb), (pte))
55
56 #endif /* _ASM_PGALLOC_H */
57