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1 /* pgalloc.h: Page allocation routines for FRV
2 *
3 * Copyright (C) 2004 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 License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Derived from:
12 * include/asm-m68knommu/pgalloc.h
13 * include/asm-i386/pgalloc.h
14 */
15 #ifndef _ASM_PGALLOC_H
16 #define _ASM_PGALLOC_H
17
18 #include <asm/setup.h>
19 #include <asm/virtconvert.h>
20
21 #ifdef CONFIG_MMU
22
23 #define pmd_populate_kernel(mm, pmd, pte) __set_pmd(pmd, __pa(pte) | _PAGE_TABLE)
24 #define pmd_populate(MM, PMD, PAGE) \
25 do { \
26 __set_pmd((PMD), page_to_pfn(PAGE) << PAGE_SHIFT | _PAGE_TABLE); \
27 } while(0)
28 #define pmd_pgtable(pmd) pmd_page(pmd)
29
30 /*
31 * Allocate and free page tables.
32 */
33
34 extern pgd_t *pgd_alloc(struct mm_struct *);
35 extern void pgd_free(struct mm_struct *mm, pgd_t *);
36
37 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
38
39 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
40
41 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
42 {
43 free_page((unsigned long)pte);
44 }
45
46 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
47 {
48 pgtable_page_dtor(pte);
49 __free_page(pte);
50 }
51
52 #define __pte_free_tlb(tlb,pte,address) \
53 do { \
54 pgtable_page_dtor(pte); \
55 tlb_remove_page((tlb),(pte)); \
56 } while (0)
57
58 /*
59 * allocating and freeing a pmd is trivial: the 1-entry pmd is
60 * inside the pgd, so has no extra memory associated with it.
61 * (In the PAE case we free the pmds as part of the pgd.)
62 */
63 #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *) 2); })
64 #define pmd_free(mm, x) do { } while (0)
65 #define __pmd_free_tlb(tlb,x,a) do { } while (0)
66
67 #endif /* CONFIG_MMU */
68
69 #endif /* _ASM_PGALLOC_H */