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