Linux kernel mirror (for testing)
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linux
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
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
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)))
27#define pmd_pgtable(pmd) pmd_page(pmd)
28
29static inline pgd_t*
30pgd_alloc(struct mm_struct *mm)
31{
32 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
33}
34
35static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
36{
37 free_page((unsigned long)pgd);
38}
39
40/* Use a slab cache for the pte pages (see also sparc64 implementation) */
41
42extern struct kmem_cache *pgtable_cache;
43
44static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
45 unsigned long address)
46{
47 return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
48}
49
50static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
51 unsigned long addr)
52{
53 struct page *page;
54
55 page = virt_to_page(pte_alloc_one_kernel(mm, addr));
56 pgtable_page_ctor(page);
57 return page;
58}
59
60static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
61{
62 kmem_cache_free(pgtable_cache, pte);
63}
64
65static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
66{
67 pgtable_page_dtor(pte);
68 kmem_cache_free(pgtable_cache, page_address(pte));
69}
70#define pmd_pgtable(pmd) pmd_page(pmd)
71
72#endif /* __KERNEL__ */
73#endif /* _XTENSA_PGALLOC_H */