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Diffstat (limited to 'arch/arm/include/asm/pgtable-3level.h')
-rw-r--r-- | arch/arm/include/asm/pgtable-3level.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h new file mode 100644 index 000000000000..759af70f9a0a --- /dev/null +++ b/arch/arm/include/asm/pgtable-3level.h | |||
@@ -0,0 +1,155 @@ | |||
1 | /* | ||
2 | * arch/arm/include/asm/pgtable-3level.h | ||
3 | * | ||
4 | * Copyright (C) 2011 ARM Ltd. | ||
5 | * Author: Catalin Marinas <catalin.marinas@arm.com> | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program; if not, write to the Free Software | ||
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
19 | */ | ||
20 | #ifndef _ASM_PGTABLE_3LEVEL_H | ||
21 | #define _ASM_PGTABLE_3LEVEL_H | ||
22 | |||
23 | /* | ||
24 | * With LPAE, there are 3 levels of page tables. Each level has 512 entries of | ||
25 | * 8 bytes each, occupying a 4K page. The first level table covers a range of | ||
26 | * 512GB, each entry representing 1GB. Since we are limited to 4GB input | ||
27 | * address range, only 4 entries in the PGD are used. | ||
28 | * | ||
29 | * There are enough spare bits in a page table entry for the kernel specific | ||
30 | * state. | ||
31 | */ | ||
32 | #define PTRS_PER_PTE 512 | ||
33 | #define PTRS_PER_PMD 512 | ||
34 | #define PTRS_PER_PGD 4 | ||
35 | |||
36 | #define PTE_HWTABLE_PTRS (PTRS_PER_PTE) | ||
37 | #define PTE_HWTABLE_OFF (0) | ||
38 | #define PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(u64)) | ||
39 | |||
40 | /* | ||
41 | * PGDIR_SHIFT determines the size a top-level page table entry can map. | ||
42 | */ | ||
43 | #define PGDIR_SHIFT 30 | ||
44 | |||
45 | /* | ||
46 | * PMD_SHIFT determines the size a middle-level page table entry can map. | ||
47 | */ | ||
48 | #define PMD_SHIFT 21 | ||
49 | |||
50 | #define PMD_SIZE (1UL << PMD_SHIFT) | ||
51 | #define PMD_MASK (~(PMD_SIZE-1)) | ||
52 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | ||
53 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | ||
54 | |||
55 | /* | ||
56 | * section address mask and size definitions. | ||
57 | */ | ||
58 | #define SECTION_SHIFT 21 | ||
59 | #define SECTION_SIZE (1UL << SECTION_SHIFT) | ||
60 | #define SECTION_MASK (~(SECTION_SIZE-1)) | ||
61 | |||
62 | #define USER_PTRS_PER_PGD (PAGE_OFFSET / PGDIR_SIZE) | ||
63 | |||
64 | /* | ||
65 | * "Linux" PTE definitions for LPAE. | ||
66 | * | ||
67 | * These bits overlap with the hardware bits but the naming is preserved for | ||
68 | * consistency with the classic page table format. | ||
69 | */ | ||
70 | #define L_PTE_PRESENT (_AT(pteval_t, 3) << 0) /* Valid */ | ||
71 | #define L_PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !PRESENT */ | ||
72 | #define L_PTE_BUFFERABLE (_AT(pteval_t, 1) << 2) /* AttrIndx[0] */ | ||
73 | #define L_PTE_CACHEABLE (_AT(pteval_t, 1) << 3) /* AttrIndx[1] */ | ||
74 | #define L_PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */ | ||
75 | #define L_PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */ | ||
76 | #define L_PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */ | ||
77 | #define L_PTE_YOUNG (_AT(pteval_t, 1) << 10) /* AF */ | ||
78 | #define L_PTE_XN (_AT(pteval_t, 1) << 54) /* XN */ | ||
79 | #define L_PTE_DIRTY (_AT(pteval_t, 1) << 55) /* unused */ | ||
80 | #define L_PTE_SPECIAL (_AT(pteval_t, 1) << 56) /* unused */ | ||
81 | |||
82 | /* | ||
83 | * To be used in assembly code with the upper page attributes. | ||
84 | */ | ||
85 | #define L_PTE_XN_HIGH (1 << (54 - 32)) | ||
86 | #define L_PTE_DIRTY_HIGH (1 << (55 - 32)) | ||
87 | |||
88 | /* | ||
89 | * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers). | ||
90 | */ | ||
91 | #define L_PTE_MT_UNCACHED (_AT(pteval_t, 0) << 2) /* strongly ordered */ | ||
92 | #define L_PTE_MT_BUFFERABLE (_AT(pteval_t, 1) << 2) /* normal non-cacheable */ | ||
93 | #define L_PTE_MT_WRITETHROUGH (_AT(pteval_t, 2) << 2) /* normal inner write-through */ | ||
94 | #define L_PTE_MT_WRITEBACK (_AT(pteval_t, 3) << 2) /* normal inner write-back */ | ||
95 | #define L_PTE_MT_WRITEALLOC (_AT(pteval_t, 7) << 2) /* normal inner write-alloc */ | ||
96 | #define L_PTE_MT_DEV_SHARED (_AT(pteval_t, 4) << 2) /* device */ | ||
97 | #define L_PTE_MT_DEV_NONSHARED (_AT(pteval_t, 4) << 2) /* device */ | ||
98 | #define L_PTE_MT_DEV_WC (_AT(pteval_t, 1) << 2) /* normal non-cacheable */ | ||
99 | #define L_PTE_MT_DEV_CACHED (_AT(pteval_t, 3) << 2) /* normal inner write-back */ | ||
100 | #define L_PTE_MT_MASK (_AT(pteval_t, 7) << 2) | ||
101 | |||
102 | /* | ||
103 | * Software PGD flags. | ||
104 | */ | ||
105 | #define L_PGD_SWAPPER (_AT(pgdval_t, 1) << 55) /* swapper_pg_dir entry */ | ||
106 | |||
107 | #ifndef __ASSEMBLY__ | ||
108 | |||
109 | #define pud_none(pud) (!pud_val(pud)) | ||
110 | #define pud_bad(pud) (!(pud_val(pud) & 2)) | ||
111 | #define pud_present(pud) (pud_val(pud)) | ||
112 | |||
113 | #define pud_clear(pudp) \ | ||
114 | do { \ | ||
115 | *pudp = __pud(0); \ | ||
116 | clean_pmd_entry(pudp); \ | ||
117 | } while (0) | ||
118 | |||
119 | #define set_pud(pudp, pud) \ | ||
120 | do { \ | ||
121 | *pudp = pud; \ | ||
122 | flush_pmd_entry(pudp); \ | ||
123 | } while (0) | ||
124 | |||
125 | static inline pmd_t *pud_page_vaddr(pud_t pud) | ||
126 | { | ||
127 | return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); | ||
128 | } | ||
129 | |||
130 | /* Find an entry in the second-level page table.. */ | ||
131 | #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) | ||
132 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) | ||
133 | { | ||
134 | return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); | ||
135 | } | ||
136 | |||
137 | #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) | ||
138 | |||
139 | #define copy_pmd(pmdpd,pmdps) \ | ||
140 | do { \ | ||
141 | *pmdpd = *pmdps; \ | ||
142 | flush_pmd_entry(pmdpd); \ | ||
143 | } while (0) | ||
144 | |||
145 | #define pmd_clear(pmdp) \ | ||
146 | do { \ | ||
147 | *pmdp = __pmd(0); \ | ||
148 | clean_pmd_entry(pmdp); \ | ||
149 | } while (0) | ||
150 | |||
151 | #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,__pte(pte_val(pte)|(ext))) | ||
152 | |||
153 | #endif /* __ASSEMBLY__ */ | ||
154 | |||
155 | #endif /* _ASM_PGTABLE_3LEVEL_H */ | ||