1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PGALLOC_H
10#define _ASM_PGALLOC_H
11
12#include <linux/highmem.h>
13#include <linux/mm.h>
14#include <linux/sched.h>
15
16#define __HAVE_ARCH_PMD_ALLOC_ONE
17#define __HAVE_ARCH_PUD_ALLOC_ONE
18#define __HAVE_ARCH_PGD_FREE
19#include <asm-generic/pgalloc.h>
20
21static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
22	pte_t *pte)
23{
24	set_pmd(pmd, __pmd((unsigned long)pte));
25}
26
27static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
28	pgtable_t pte)
29{
30	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
31}
32
33/*
34 * Initialize a new pmd table with invalid pointers.
35 */
36extern void pmd_init(void *addr);
37
38#ifndef __PAGETABLE_PMD_FOLDED
39
40static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
41{
42	set_pud(pud, __pud((unsigned long)pmd));
43}
44#endif
45
46/*
47 * Initialize a new pgd table with invalid pointers.
48 */
49extern void pgd_init(void *addr);
50extern pgd_t *pgd_alloc(struct mm_struct *mm);
51
52static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
53{
54	pagetable_free(virt_to_ptdesc(pgd));
55}
56
57#define __pte_free_tlb(tlb, pte, address)			\
58do {								\
59	pagetable_pte_dtor(page_ptdesc(pte));			\
60	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));	\
61} while (0)
62
63#ifndef __PAGETABLE_PMD_FOLDED
64
65static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
66{
67	pmd_t *pmd;
68	struct ptdesc *ptdesc;
69
70	ptdesc = pagetable_alloc(GFP_KERNEL_ACCOUNT, PMD_TABLE_ORDER);
71	if (!ptdesc)
72		return NULL;
73
74	if (!pagetable_pmd_ctor(ptdesc)) {
75		pagetable_free(ptdesc);
76		return NULL;
77	}
78
79	pmd = ptdesc_address(ptdesc);
80	pmd_init(pmd);
81	return pmd;
82}
83
84#define __pmd_free_tlb(tlb, x, addr)	pmd_free((tlb)->mm, x)
85
86#endif
87
88#ifndef __PAGETABLE_PUD_FOLDED
89
90static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
91{
92	pud_t *pud;
93	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM,
94			PUD_TABLE_ORDER);
95
96	if (!ptdesc)
97		return NULL;
98	pagetable_pud_ctor(ptdesc);
99	pud = ptdesc_address(ptdesc);
100
101	pud_init(pud);
102	return pud;
103}
104
105static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
106{
107	set_p4d(p4d, __p4d((unsigned long)pud));
108}
109
110#define __pud_free_tlb(tlb, x, addr)	pud_free((tlb)->mm, x)
111
112#endif /* __PAGETABLE_PUD_FOLDED */
113
114extern void pagetable_init(void);
115
116#endif /* _ASM_PGALLOC_H */
117