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					 unsigned long address)
43{
44	pte_t *ptep;
45	int i;
46
47	ptep = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
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
55static 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
72static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
73{
74	free_page((unsigned long)pte);
75}
76
77static 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 */
86