| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-xtensa/pgalloc.h |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Copyright (C) 2001-2007 Tensilica Inc. |
| 9 | */ |
| 10 | |
| 11 | #ifndef _XTENSA_PGALLOC_H |
| 12 | #define _XTENSA_PGALLOC_H |
| 13 | |
| 14 | #ifdef __KERNEL__ |
| 15 | |
| 16 | #include <linux/highmem.h> |
| 17 | #include <linux/slab.h> |
| 18 | |
| 19 | /* |
| 20 | * Allocating and freeing a pmd is trivial: the 1-entry pmd is |
| 21 | * inside the pgd, so has no extra memory associated with it. |
| 22 | */ |
| 23 | |
| 24 | #define pmd_populate_kernel(mm, pmdp, ptep) \ |
| 25 | (pmd_val(*(pmdp)) = ((unsigned long)ptep)) |
| 26 | #define pmd_populate(mm, pmdp, page) \ |
| 27 | (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) |
| 28 | #define pmd_pgtable(pmd) pmd_page(pmd) |
| 29 | |
| 30 | static inline pgd_t* |
| 31 | pgd_alloc(struct mm_struct *mm) |
| 32 | { |
| 33 | return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); |
| 34 | } |
| 35 | |
| 36 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
| 37 | { |
| 38 | free_page((unsigned long)pgd); |
| 39 | } |
| 40 | |
| 41 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
| 42 | unsigned long address) |
| 43 | { |
| 44 | pte_t *ptep; |
| 45 | int i; |
| 46 | |
| 47 | ptep = (pte_t *)__get_free_page(GFP_KERNEL); |
| 48 | if (!ptep) |
| 49 | return NULL; |
| 50 | for (i = 0; i < 1024; i++) |
| 51 | pte_clear(NULL, 0, ptep + i); |
| 52 | return ptep; |
| 53 | } |
| 54 | |
| 55 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm, |
| 56 | unsigned long addr) |
| 57 | { |
| 58 | pte_t *pte; |
| 59 | struct page *page; |
| 60 | |
| 61 | pte = pte_alloc_one_kernel(mm, addr); |
| 62 | if (!pte) |
| 63 | return NULL; |
| 64 | page = virt_to_page(pte); |
| 65 | if (!pgtable_page_ctor(page)) { |
| 66 | __free_page(page); |
| 67 | return NULL; |
| 68 | } |
| 69 | return page; |
| 70 | } |
| 71 | |
| 72 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| 73 | { |
| 74 | free_page((unsigned long)pte); |
| 75 | } |
| 76 | |
| 77 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
| 78 | { |
| 79 | pgtable_page_dtor(pte); |
| 80 | __free_page(pte); |
| 81 | } |
| 82 | #define pmd_pgtable(pmd) pmd_page(pmd) |
| 83 | |
| 84 | #endif /* __KERNEL__ */ |
| 85 | #endif /* _XTENSA_PGALLOC_H */ |