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 #include <asm-generic/pgalloc.h>
19 
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)20 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
21 	pte_t *pte)
22 {
23 	set_pmd(pmd, __pmd((unsigned long)pte));
24 }
25 
pmd_populate(struct mm_struct * mm,pmd_t * pmd,pgtable_t pte)26 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
27 	pgtable_t pte)
28 {
29 	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
30 }
31 
32 /*
33  * Initialize a new pmd table with invalid pointers.
34  */
35 extern void pmd_init(void *addr);
36 
37 #ifndef __PAGETABLE_PMD_FOLDED
38 
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)39 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
40 {
41 	set_pud(pud, __pud((unsigned long)pmd));
42 }
43 #endif
44 
45 /*
46  * Initialize a new pgd table with invalid pointers.
47  */
48 extern void pgd_init(void *addr);
49 extern pgd_t *pgd_alloc(struct mm_struct *mm);
50 
51 #define __pte_free_tlb(tlb, pte, address)	\
52 	tlb_remove_ptdesc((tlb), page_ptdesc(pte))
53 
54 #ifndef __PAGETABLE_PMD_FOLDED
55 
pmd_alloc_one(struct mm_struct * mm,unsigned long address)56 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
57 {
58 	pmd_t *pmd;
59 	struct ptdesc *ptdesc;
60 
61 	ptdesc = pagetable_alloc(GFP_KERNEL_ACCOUNT, PMD_TABLE_ORDER);
62 	if (!ptdesc)
63 		return NULL;
64 
65 	if (!pagetable_pmd_ctor(ptdesc)) {
66 		pagetable_free(ptdesc);
67 		return NULL;
68 	}
69 
70 	pmd = ptdesc_address(ptdesc);
71 	pmd_init(pmd);
72 	return pmd;
73 }
74 
75 #define __pmd_free_tlb(tlb, x, addr)	pmd_free((tlb)->mm, x)
76 
77 #endif
78 
79 #ifndef __PAGETABLE_PUD_FOLDED
80 
pud_alloc_one(struct mm_struct * mm,unsigned long address)81 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
82 {
83 	pud_t *pud;
84 	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM,
85 			PUD_TABLE_ORDER);
86 
87 	if (!ptdesc)
88 		return NULL;
89 	pagetable_pud_ctor(ptdesc);
90 	pud = ptdesc_address(ptdesc);
91 
92 	pud_init(pud);
93 	return pud;
94 }
95 
p4d_populate(struct mm_struct * mm,p4d_t * p4d,pud_t * pud)96 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
97 {
98 	set_p4d(p4d, __p4d((unsigned long)pud));
99 }
100 
101 #define __pud_free_tlb(tlb, x, addr)	pud_free((tlb)->mm, x)
102 
103 #endif /* __PAGETABLE_PUD_FOLDED */
104 
105 extern void pagetable_init(void);
106 
107 #endif /* _ASM_PGALLOC_H */
108