1#ifndef _METAG_PGALLOC_H
2#define _METAG_PGALLOC_H
3
4#include <linux/threads.h>
5#include <linux/mm.h>
6
7#define pmd_populate_kernel(mm, pmd, pte) \
8	set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
9
10#define pmd_populate(mm, pmd, pte) \
11	set_pmd(pmd, __pmd(_PAGE_TABLE | page_to_phys(pte)))
12
13#define pmd_pgtable(pmd) pmd_page(pmd)
14
15/*
16 * Allocate and free page tables.
17 */
18#ifdef CONFIG_METAG_META21_MMU
19static inline void pgd_ctor(pgd_t *pgd)
20{
21	memcpy(pgd + USER_PTRS_PER_PGD,
22	       swapper_pg_dir + USER_PTRS_PER_PGD,
23	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
24}
25#else
26#define pgd_ctor(x)	do { } while (0)
27#endif
28
29static inline pgd_t *pgd_alloc(struct mm_struct *mm)
30{
31	pgd_t *pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
32	if (pgd)
33		pgd_ctor(pgd);
34	return pgd;
35}
36
37static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
38{
39	free_page((unsigned long)pgd);
40}
41
42static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
43					  unsigned long address)
44{
45	pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT |
46					      __GFP_ZERO);
47	return pte;
48}
49
50static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
51				      unsigned long address)
52{
53	struct page *pte;
54	pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO, 0);
55	if (!pte)
56		return NULL;
57	if (!pgtable_page_ctor(pte)) {
58		__free_page(pte);
59		return NULL;
60	}
61	return pte;
62}
63
64static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
65{
66	free_page((unsigned long)pte);
67}
68
69static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
70{
71	pgtable_page_dtor(pte);
72	__free_page(pte);
73}
74
75#define __pte_free_tlb(tlb, pte, addr)				\
76	do {							\
77		pgtable_page_dtor(pte);				\
78		tlb_remove_page((tlb), (pte));			\
79	} while (0)
80
81#define check_pgt_cache()	do { } while (0)
82
83#endif
84