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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/pgalloc.h | |
3 | * | |
4 | * Copyright (C) 2000-2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #ifndef _ASMARM_PGALLOC_H | |
11 | #define _ASMARM_PGALLOC_H | |
12 | ||
13 | #include <asm/processor.h> | |
14 | #include <asm/cacheflush.h> | |
15 | #include <asm/tlbflush.h> | |
16 | #include <linux/slab.h> | |
17 | ||
e18b890b | 18 | extern struct kmem_cache *pte_cache; |
1da177e4 LT |
19 | |
20 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr){ | |
21 | return kmem_cache_alloc(pte_cache, GFP_KERNEL); | |
22 | } | |
23 | ||
24 | static inline void pte_free_kernel(pte_t *pte){ | |
25 | if (pte) | |
26 | kmem_cache_free(pte_cache, pte); | |
27 | } | |
28 | ||
29 | /* | |
30 | * Populate the pmdp entry with a pointer to the pte. This pmd is part | |
31 | * of the mm address space. | |
32 | * | |
33 | * If 'mm' is the init tasks mm, then we are doing a vmalloc, and we | |
34 | * need to set stuff up correctly for it. | |
35 | */ | |
36 | static inline void | |
37 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) | |
38 | { | |
39 | //FIXME - is this doing the right thing? | |
40 | set_pmd(pmdp, (unsigned long)ptep | 1/*FIXME _PMD_PRESENT*/); | |
41 | } | |
42 | ||
43 | /* | |
44 | * FIXME - We use the old 2.5.5-rmk1 hack for this. | |
45 | * This is not truly correct, but should be functional. | |
46 | */ | |
47 | #define pte_alloc_one(mm,addr) ((struct page *)pte_alloc_one_kernel(mm,addr)) | |
48 | #define pte_free(pte) pte_free_kernel((pte_t *)pte) | |
49 | #define pmd_populate(mm,pmdp,ptep) pmd_populate_kernel(mm,pmdp,(pte_t *)ptep) | |
50 | ||
51 | /* | |
52 | * Since we have only two-level page tables, these are trivial | |
53 | * | |
54 | * trick __pmd_alloc into optimising away. The actual value is irrelevant though as it | |
55 | * is thrown away. It just cant be zero. -IM | |
56 | */ | |
57 | ||
58 | #define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); }) | |
59 | #define pmd_free(pmd) do { } while (0) | |
60 | #define pgd_populate(mm,pmd,pte) BUG() | |
61 | ||
62 | extern pgd_t *get_pgd_slow(struct mm_struct *mm); | |
63 | extern void free_pgd_slow(pgd_t *pgd); | |
64 | ||
65 | #define pgd_alloc(mm) get_pgd_slow(mm) | |
66 | #define pgd_free(pgd) free_pgd_slow(pgd) | |
67 | ||
68 | #define check_pgt_cache() do { } while (0) | |
69 | ||
70 | #endif |