| 1 |
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| 2 | |
| 3 | * include/asm-xtensa/pgalloc.h
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| 4 | *
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| 5 | * Copyright (C) 2001-2007 Tensilica Inc.
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| 6 |
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| 7 |
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| 8 | #ifndef _XTENSA_PGALLOC_H
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| 9 | #define _XTENSA_PGALLOC_H
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| 10 |
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| 11 | #ifdef CONFIG_MMU
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| 12 | #include <linux/highmem.h>
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| 13 | #include <linux/slab.h>
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| 14 |
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| 15 | #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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| 16 | #define __HAVE_ARCH_PTE_ALLOC_ONE
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| 17 | #include <asm-generic/pgalloc.h>
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| 18 |
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| 19 | |
| 20 | * Allocating and freeing a pmd is trivial: the 1-entry pmd is
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| 21 | * inside the pgd, so has no extra memory associated with it.
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| 22 |
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| 23 |
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| 24 | #define pmd_populate_kernel(mm, pmdp, ptep) \
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| 25 | (pmd_val(*(pmdp)) = ((unsigned long)ptep))
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| 26 | #define pmd_populate(mm, pmdp, page) \
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| 27 | (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
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| 28 |
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| 29 | static inline pgd_t*
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| 30 | pgd_alloc(struct mm_struct *mm)
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| 31 | {
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| 32 | return __pgd_alloc(mm, 0);
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| 33 | }
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| 34 |
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| 35 | static inline void ptes_clear(pte_t *ptep)
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| 36 | {
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| 37 | int i;
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| 38 |
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| 39 | for (i = 0; i < PTRS_PER_PTE; i++)
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| 40 | pte_clear(NULL, 0, ptep + i);
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| 41 | }
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| 42 |
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| 43 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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| 44 | {
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| 45 | pte_t *ptep;
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| 46 |
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| 47 | ptep = (pte_t *)__pte_alloc_one_kernel(mm);
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| 48 | if (!ptep)
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| 49 | return NULL;
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| 50 | ptes_clear(ptep);
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| 51 | return ptep;
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| 52 | }
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| 53 |
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| 54 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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| 55 | {
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| 56 | struct page *page;
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| 57 |
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| 58 | page = __pte_alloc_one(mm, GFP_PGTABLE_USER);
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| 59 | if (!page)
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| 60 | return NULL;
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| 61 | ptes_clear(page_address(page));
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| 62 | return page;
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| 63 | }
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| 64 |
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| 65 | #endif
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| 66 |
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| 67 | #endif
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