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#include <linux/highmem.h>
15#include <linux/slab.h>
16
17/*
18 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
19 * inside the pgd, so has no extra memory associated with it.
20 */
21
22#define pmd_populate_kernel(mm, pmdp, ptep) \
23 (pmd_val(*(pmdp)) = ((unsigned long)ptep))
24#define pmd_populate(mm, pmdp, page) \
25 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
26#define pmd_pgtable(pmd) pmd_page(pmd)
27
28static inline pgd_t*
29pgd_alloc(struct mm_struct *mm)
30{
31 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
32}
33
34static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
35{
36 free_page((unsigned long)pgd);
37}
38
39static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
40{
41 pte_t *ptep;
42 int i;
43
44 ptep = (pte_t *)__get_free_page(GFP_KERNEL);
45 if (!ptep)
46 return NULL;
47 for (i = 0; i < 1024; i++)
48 pte_clear(NULL, 0, ptep + i);
49 return ptep;
50}
51
52static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
53{
54 pte_t *pte;
55 struct page *page;
56
57 pte = pte_alloc_one_kernel(mm);
58 if (!pte)
59 return NULL;
60 page = virt_to_page(pte);
61 if (!pgtable_page_ctor(page)) {
62 __free_page(page);
63 return NULL;
64 }
65 return page;
66}
67
68static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
69{
70 free_page((unsigned long)pte);
71}
72
73static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
74{
75 pgtable_page_dtor(pte);
76 __free_page(pte);
77}
78#define pmd_pgtable(pmd) pmd_page(pmd)
79
80#endif /* _XTENSA_PGALLOC_H */