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#define pmd_pgtable(pmd) pmd_page(pmd)
33
34/*
35 * Initialize a new pmd table with invalid pointers.
36 */
37extern void pmd_init(unsigned long page, unsigned long pagetable);
38
39#ifndef __PAGETABLE_PMD_FOLDED
40
41static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
42{
43	set_pud(pud, __pud((unsigned long)pmd));
44}
45#endif
46
47/*
48 * Initialize a new pgd / pmd table with invalid pointers.
49 */
50extern void pgd_init(unsigned long page);
51extern pgd_t *pgd_alloc(struct mm_struct *mm);
52
53static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
54{
55	free_pages((unsigned long)pgd, PGD_ORDER);
56}
57
58#define __pte_free_tlb(tlb,pte,address)			\
59do {							\
60	pgtable_pte_page_dtor(pte);			\
61	tlb_remove_page((tlb), pte);			\
62} while (0)
63
64#ifndef __PAGETABLE_PMD_FOLDED
65
66static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
67{
68	pmd_t *pmd;
69	struct page *pg;
70
71	pg = alloc_pages(GFP_KERNEL_ACCOUNT, PMD_ORDER);
72	if (!pg)
73		return NULL;
74
75	if (!pgtable_pmd_page_ctor(pg)) {
76		__free_pages(pg, PMD_ORDER);
77		return NULL;
78	}
79
80	pmd = (pmd_t *)page_address(pg);
81	pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
82	return pmd;
83}
84
85#define __pmd_free_tlb(tlb, x, addr)	pmd_free((tlb)->mm, x)
86
87#endif
88
89#ifndef __PAGETABLE_PUD_FOLDED
90
91static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
92{
93	pud_t *pud;
94
95	pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER);
96	if (pud)
97		pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
98	return pud;
99}
100
101static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
102{
103	set_p4d(p4d, __p4d((unsigned long)pud));
104}
105
106#define __pud_free_tlb(tlb, x, addr)	pud_free((tlb)->mm, x)
107
108#endif /* __PAGETABLE_PUD_FOLDED */
109
110extern void pagetable_init(void);
111
112#endif /* _ASM_PGALLOC_H */
113