1 /*
2 * arch/arm/include/asm/pgalloc.h
3 *
4 * Copyright (C) 2000-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #ifndef _ASMARM_PGALLOC_H
11 #define _ASMARM_PGALLOC_H
12
13 #include <linux/pagemap.h>
14
15 #include <asm/domain.h>
16 #include <asm/pgtable-hwdef.h>
17 #include <asm/processor.h>
18 #include <asm/cacheflush.h>
19 #include <asm/tlbflush.h>
20
21 #define check_pgt_cache() do { } while (0)
22
23 #ifdef CONFIG_MMU
24
25 #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
26 #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
27
28 #ifdef CONFIG_ARM_LPAE
29
pmd_alloc_one(struct mm_struct * mm,unsigned long addr)30 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
31 {
32 return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
33 }
34
pmd_free(struct mm_struct * mm,pmd_t * pmd)35 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
36 {
37 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
38 free_page((unsigned long)pmd);
39 }
40
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)41 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
42 {
43 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
44 }
45
46 #else /* !CONFIG_ARM_LPAE */
47
48 /*
49 * Since we have only two-level page tables, these are trivial
50 */
51 #define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
52 #define pmd_free(mm, pmd) do { } while (0)
53 #define pud_populate(mm,pmd,pte) BUG()
54
55 #endif /* CONFIG_ARM_LPAE */
56
57 extern pgd_t *pgd_alloc(struct mm_struct *mm);
58 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
59
60 #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
61
clean_pte_table(pte_t * pte)62 static inline void clean_pte_table(pte_t *pte)
63 {
64 clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
65 }
66
67 /*
68 * Allocate one PTE table.
69 *
70 * This actually allocates two hardware PTE tables, but we wrap this up
71 * into one table thus:
72 *
73 * +------------+
74 * | Linux pt 0 |
75 * +------------+
76 * | Linux pt 1 |
77 * +------------+
78 * | h/w pt 0 |
79 * +------------+
80 * | h/w pt 1 |
81 * +------------+
82 */
83 static inline pte_t *
pte_alloc_one_kernel(struct mm_struct * mm,unsigned long addr)84 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
85 {
86 pte_t *pte;
87
88 pte = (pte_t *)__get_free_page(PGALLOC_GFP);
89 if (pte)
90 clean_pte_table(pte);
91
92 return pte;
93 }
94
95 static inline pgtable_t
pte_alloc_one(struct mm_struct * mm,unsigned long addr)96 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
97 {
98 struct page *pte;
99
100 #ifdef CONFIG_HIGHPTE
101 pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
102 #else
103 pte = alloc_pages(PGALLOC_GFP, 0);
104 #endif
105 if (pte) {
106 if (!PageHighMem(pte))
107 clean_pte_table(page_address(pte));
108 pgtable_page_ctor(pte);
109 }
110
111 return pte;
112 }
113
114 /*
115 * Free one PTE table.
116 */
pte_free_kernel(struct mm_struct * mm,pte_t * pte)117 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
118 {
119 if (pte)
120 free_page((unsigned long)pte);
121 }
122
pte_free(struct mm_struct * mm,pgtable_t pte)123 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
124 {
125 pgtable_page_dtor(pte);
126 __free_page(pte);
127 }
128
__pmd_populate(pmd_t * pmdp,phys_addr_t pte,pmdval_t prot)129 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
130 pmdval_t prot)
131 {
132 pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
133 pmdp[0] = __pmd(pmdval);
134 #ifndef CONFIG_ARM_LPAE
135 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
136 #endif
137 flush_pmd_entry(pmdp);
138 }
139
140 /*
141 * Populate the pmdp entry with a pointer to the pte. This pmd is part
142 * of the mm address space.
143 *
144 * Ensure that we always set both PMD entries.
145 */
146 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)147 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
148 {
149 /*
150 * The pmd must be loaded with the physical address of the PTE table
151 */
152 __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
153 }
154
155 static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)156 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
157 {
158 __pmd_populate(pmdp, page_to_phys(ptep), _PAGE_USER_TABLE);
159 }
160 #define pmd_pgtable(pmd) pmd_page(pmd)
161
162 #endif /* CONFIG_MMU */
163
164 #endif
165