Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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#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
30static inline pgd_t*
31pgd_alloc(struct mm_struct *mm)
32{
33 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
34}
35
36static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
37{
38 free_page((unsigned long)pgd);
39}
40
41static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
42{
43 pte_t *ptep;
44 int i;
45
46 ptep = (pte_t *)__get_free_page(GFP_KERNEL);
47 if (!ptep)
48 return NULL;
49 for (i = 0; i < 1024; i++)
50 pte_clear(NULL, 0, ptep + i);
51 return ptep;
52}
53
54static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
55{
56 pte_t *pte;
57 struct page *page;
58
59 pte = pte_alloc_one_kernel(mm);
60 if (!pte)
61 return NULL;
62 page = virt_to_page(pte);
63 if (!pgtable_page_ctor(page)) {
64 __free_page(page);
65 return NULL;
66 }
67 return page;
68}
69
70static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
71{
72 free_page((unsigned long)pte);
73}
74
75static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
76{
77 pgtable_page_dtor(pte);
78 __free_page(pte);
79}
80#define pmd_pgtable(pmd) pmd_page(pmd)
81
82#endif /* __KERNEL__ */
83#endif /* _XTENSA_PGALLOC_H */