1/*
 2 * Copyright (C) 2004-2006 Atmel Corporation
 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#ifndef __ASM_AVR32_PGALLOC_H
 9#define __ASM_AVR32_PGALLOC_H
10
11#include <linux/mm.h>
12#include <linux/quicklist.h>
13#include <asm/page.h>
14#include <asm/pgtable.h>
15
16#define QUICK_PGD	0	/* Preserve kernel mappings over free */
17#define QUICK_PT	1	/* Zero on free */
18
19static inline void pmd_populate_kernel(struct mm_struct *mm,
20				       pmd_t *pmd, pte_t *pte)
21{
22	set_pmd(pmd, __pmd((unsigned long)pte));
23}
24
25static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
26				    pgtable_t pte)
27{
28	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
29}
30#define pmd_pgtable(pmd) pmd_page(pmd)
31
32static inline void pgd_ctor(void *x)
33{
34	pgd_t *pgd = x;
35
36	memcpy(pgd + USER_PTRS_PER_PGD,
37		swapper_pg_dir + USER_PTRS_PER_PGD,
38		(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
39}
40
41/*
42 * Allocate and free page tables
43 */
44static inline pgd_t *pgd_alloc(struct mm_struct *mm)
45{
46	return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
47}
48
49static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
50{
51	quicklist_free(QUICK_PGD, NULL, pgd);
52}
53
54static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
55					  unsigned long address)
56{
57	return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
58}
59
60static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
61					 unsigned long address)
62{
63	struct page *page;
64	void *pg;
65
66	pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
67	if (!pg)
68		return NULL;
69
70	page = virt_to_page(pg);
71	pgtable_page_ctor(page);
72
73	return page;
74}
75
76static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
77{
78	quicklist_free(QUICK_PT, NULL, pte);
79}
80
81static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
82{
83	pgtable_page_dtor(pte);
84	quicklist_free_page(QUICK_PT, NULL, pte);
85}
86
87#define __pte_free_tlb(tlb,pte,addr)			\
88do {							\
89	pgtable_page_dtor(pte);				\
90	tlb_remove_page((tlb), pte);			\
91} while (0)
92
93static inline void check_pgt_cache(void)
94{
95	quicklist_trim(QUICK_PGD, NULL, 25, 16);
96	quicklist_trim(QUICK_PT, NULL, 25, 16);
97}
98
99#endif /* __ASM_AVR32_PGALLOC_H */