Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 1 | /* |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 2 | * include/asm-xtensa/pgalloc.h |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 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 | * |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 8 | * Copyright (C) 2001-2007 Tensilica Inc. |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #ifndef _XTENSA_PGALLOC_H |
| 12 | #define _XTENSA_PGALLOC_H |
| 13 | |
| 14 | #ifdef __KERNEL__ |
| 15 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 16 | #include <linux/highmem.h> |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 17 | |
| 18 | /* |
| 19 | * Allocating and freeing a pmd is trivial: the 1-entry pmd is |
| 20 | * inside the pgd, so has no extra memory associated with it. |
| 21 | */ |
| 22 | |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 23 | #define pmd_populate_kernel(mm, pmdp, ptep) \ |
| 24 | (pmd_val(*(pmdp)) = ((unsigned long)ptep)) |
| 25 | #define pmd_populate(mm, pmdp, page) \ |
| 26 | (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 27 | |
| 28 | static inline pgd_t* |
| 29 | pgd_alloc(struct mm_struct *mm) |
| 30 | { |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 31 | return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 32 | } |
| 33 | |
Benjamin Herrenschmidt | 5e54197 | 2008-02-04 22:29:14 -0800 | [diff] [blame] | 34 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 35 | { |
| 36 | free_page((unsigned long)pgd); |
| 37 | } |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 38 | |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 39 | /* Use a slab cache for the pte pages (see also sparc64 implementation) */ |
| 40 | |
| 41 | extern struct kmem_cache *pgtable_cache; |
| 42 | |
| 43 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
| 44 | unsigned long address) |
| 45 | { |
| 46 | return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT); |
| 47 | } |
| 48 | |
| 49 | static inline struct page *pte_alloc_one(struct mm_struct *mm, |
| 50 | unsigned long addr) |
| 51 | { |
| 52 | return virt_to_page(pte_alloc_one_kernel(mm, addr)); |
| 53 | } |
| 54 | |
Benjamin Herrenschmidt | 5e54197 | 2008-02-04 22:29:14 -0800 | [diff] [blame] | 55 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 56 | { |
| 57 | kmem_cache_free(pgtable_cache, pte); |
| 58 | } |
| 59 | |
Benjamin Herrenschmidt | 5e54197 | 2008-02-04 22:29:14 -0800 | [diff] [blame] | 60 | static inline void pte_free(struct mm_struct *mm, struct page *page) |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 61 | { |
| 62 | kmem_cache_free(pgtable_cache, page_address(page)); |
| 63 | } |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 64 | |
| 65 | #endif /* __KERNEL__ */ |
| 66 | #endif /* _XTENSA_PGALLOC_H */ |