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97 | 97 | ||
98 | /* pte should point into ptl3 */ |
98 | /* pte should point into ptl3 */ |
99 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
99 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
100 | /* pte should point into ptl3 */ |
100 | /* pte should point into ptl3 */ |
101 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW ) |
101 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW ) |
102 | - | ||
103 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
102 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
104 | 103 | ||
105 | #ifndef __ASM__ |
104 | #ifndef __ASM__ |
106 | 105 | ||
- | 106 | /** Level 0 page table entry. */ |
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- | 107 | typedef struct { |
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- | 108 | /* 01b for coarse tables, see below for details */ |
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- | 109 | unsigned descriptor_type : 2; |
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- | 110 | unsigned impl_specific : 3; |
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- | 111 | unsigned domain : 4; |
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- | 112 | unsigned should_be_zero : 1; |
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- | 113 | /* Pointer to the coarse 2nd level page table (holding entries for small (4KB) |
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- | 114 | * or large (64KB) pages. ARM also supports fine 2nd level page tables that |
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- | 115 | * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison |
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- | 116 | * with 1KB per the coarse table) |
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- | 117 | */ |
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- | 118 | unsigned coarse_table_addr : 22; |
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- | 119 | } __attribute__ ((packed)) pte_level0_t; |
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- | 120 | ||
- | 121 | /** Level 1 page table entry (small (4KB) pages used) */ |
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- | 122 | typedef struct { |
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- | 123 | /* 0b10 for small pages */ |
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- | 124 | unsigned descriptor_type : 2; |
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- | 125 | unsigned bufferable : 1; |
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- | 126 | unsigned cacheable : 1; |
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- | 127 | /* access permissions for each of 4 subparts of a page |
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- | 128 | * (for each 1KB when small pages used */ |
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- | 129 | unsigned access_permission_0 : 2; |
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- | 130 | unsigned access_permission_1 : 2; |
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- | 131 | unsigned access_permission_2 : 2; |
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- | 132 | unsigned access_permission_3 : 2; |
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- | 133 | unsigned frame_base_addr : 20; |
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- | 134 | } __attribute__ ((packed)) pte_level1_t; |
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- | 135 | ||
- | 136 | ||
- | 137 | /* Level 1 page tables access permissions */ |
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- | 138 | ||
- | 139 | /** User mode: no access, privileged mode: no access */ |
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- | 140 | #define PTE_AP_USER_NO_KERNEL_NO 0 |
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- | 141 | /** User mode: no access, privileged mode: read/write */ |
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- | 142 | #define PTE_AP_USER_NO_KERNEL_RW 1 |
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- | 143 | /** User mode: read only, privileged mode: read/write */ |
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- | 144 | #define PTE_AP_USER_RO_KERNEL_RW 2 |
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- | 145 | /** User mode: read/write, privileged mode: read/write */ |
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- | 146 | #define PTE_AP_USER_RW_KERNEL_RW 3 |
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- | 147 | ||
- | 148 | ||
- | 149 | /* pte_level0_t and pte_level1_t descriptor_type flags */ |
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- | 150 | ||
- | 151 | /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type) */ |
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- | 152 | #define PTE_DESCRIPTOR_NOT_PRESENT 0 |
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- | 153 | /** pte_level0_t coarse page table flag (used in descriptor_type) */ |
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- | 154 | #define PTE_DESCRIPTOR_COARSE_TABLE 1 |
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- | 155 | /** pte_level1_t small page table flag (used in descriptor type) */ |
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- | 156 | #define PTE_DESCRIPTOR_SMALL_PAGE 2 |
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- | 157 | ||
- | 158 | ||
107 | /** |
159 | /** |
108 | * Sets the address of level 0 page table. |
160 | * Sets the address of level 0 page table. |
109 | * |
161 | * |
110 | * \param pt pointer to the page table to set |
162 | * \param pt pointer to the page table to set |
111 | */ |
163 | */ |
112 | static inline void set_ptl0_addr( pte_level0_t* pt) |
164 | static inline void set_ptl0_addr( pte_level0_t* pt) |
113 | { |
165 | { |
- | 166 | asm volatile ( |
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114 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
167 | "mcr p15, 0, %0, c2, c0, 0 \n" |
115 | : |
168 | : |
116 | : "r"(pt) |
169 | : "r"(pt) |
117 | ); |
170 | ); |
118 | - | ||
119 | } |
171 | } |
120 | 172 | ||
121 | /** Returns level 0 page table entry flags. |
173 | /** Returns level 0 page table entry flags. |
122 | * |
174 | * |
123 | * \param pt level 0 page table |
175 | * \param pt level 0 page table |