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2128 | jermar | 1 | /* |
2238 | kebrt | 2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2128 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup arm32mm |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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2410 | stepan | 33 | * @brief Paging related declarations. |
2128 | jermar | 34 | */ |
35 | |||
36 | #ifndef KERN_arm32_PAGE_H_ |
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37 | #define KERN_arm32_PAGE_H_ |
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38 | |||
39 | #include <arch/mm/frame.h> |
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2182 | jancik | 40 | #include <mm/mm.h> |
41 | #include <arch/exception.h> |
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2128 | jermar | 42 | |
2182 | jancik | 43 | |
2128 | jermar | 44 | #define PAGE_WIDTH FRAME_WIDTH |
45 | #define PAGE_SIZE FRAME_SIZE |
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46 | |||
47 | #define PAGE_COLOR_BITS 0 /* dummy */ |
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48 | |||
49 | #ifndef __ASM__ |
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50 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
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51 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
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52 | #else |
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53 | # define KA2PA(x) ((x) - 0x80000000) |
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54 | # define PA2KA(x) ((x) + 0x80000000) |
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55 | #endif |
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56 | |||
57 | #ifdef KERNEL |
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58 | |||
2276 | jancik | 59 | #define PTL0_ENTRIES_ARCH (2<<12) // 4096 |
60 | #define PTL1_ENTRIES_ARCH 0 |
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61 | #define PTL2_ENTRIES_ARCH 0 |
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2241 | kebrt | 62 | /* coarse page tables used (256*4 = 1KB per page) */ |
2276 | jancik | 63 | #define PTL3_ENTRIES_ARCH (2<<8) // 256 |
2128 | jermar | 64 | |
2276 | jancik | 65 | #define PTL0_SIZE_ARCH FOUR_FRAMES |
66 | #define PTL1_SIZE_ARCH 0 |
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67 | #define PTL2_SIZE_ARCH 0 |
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68 | #define PTL3_SIZE_ARCH ONE_FRAME |
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2242 | kebrt | 69 | |
2276 | jancik | 70 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
71 | #define PTL1_INDEX_ARCH(vaddr) 0 |
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72 | #define PTL2_INDEX_ARCH(vaddr) 0 |
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73 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x0ff) |
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2128 | jermar | 74 | |
2276 | jancik | 75 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *)( (((pte_level0_t*)(ptl0))[(i)]).coarse_table_addr << 10 )) |
76 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
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77 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
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78 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((uintptr_t)( (((pte_level1_t*)(ptl3))[(i)]).frame_base_addr << 12 )) |
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2128 | jermar | 79 | |
2276 | jancik | 80 | #define SET_PTL0_ADDRESS_ARCH(ptl0) (set_ptl0_addr((pte_level0_t *)(ptl0))) |
81 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_level0_t *)(ptl0))[(i)].coarse_table_addr = (a)>>10) |
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2147 | jancik | 82 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
83 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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2276 | jancik | 84 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12) |
2128 | jermar | 85 | |
2276 | jancik | 86 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i)) |
87 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
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88 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
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89 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i)) |
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2128 | jermar | 90 | |
2276 | jancik | 91 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i), (x)) |
2147 | jancik | 92 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
93 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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2276 | jancik | 94 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x)) |
2128 | jermar | 95 | |
2276 | jancik | 96 | #define PTE_VALID_ARCH(pte) (*((uint32_t *) (pte)) != 0) |
97 | #define PTE_PRESENT_ARCH(pte) ( ((pte_level0_t *)(pte))->descriptor_type != 0 ) |
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2241 | kebrt | 98 | |
99 | /* pte should point into ptl3 */ |
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2276 | jancik | 100 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
2241 | kebrt | 101 | /* pte should point into ptl3 */ |
2276 | jancik | 102 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW ) |
103 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
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2241 | kebrt | 104 | |
2329 | kebrt | 105 | |
2128 | jermar | 106 | #ifndef __ASM__ |
107 | |||
2276 | jancik | 108 | /** Level 0 page table entry. */ |
109 | typedef struct { |
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110 | /* 01b for coarse tables, see below for details */ |
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111 | unsigned descriptor_type : 2; |
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112 | unsigned impl_specific : 3; |
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113 | unsigned domain : 4; |
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114 | unsigned should_be_zero : 1; |
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115 | /* Pointer to the coarse 2nd level page table (holding entries for small (4KB) |
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116 | * or large (64KB) pages. ARM also supports fine 2nd level page tables that |
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117 | * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison |
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118 | * with 1KB per the coarse table) |
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119 | */ |
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120 | unsigned coarse_table_addr : 22; |
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121 | } __attribute__ ((packed)) pte_level0_t; |
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122 | |||
2329 | kebrt | 123 | |
124 | /** Level 1 page table entry (small (4KB) pages used). */ |
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2276 | jancik | 125 | typedef struct { |
126 | /* 0b10 for small pages */ |
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127 | unsigned descriptor_type : 2; |
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128 | unsigned bufferable : 1; |
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129 | unsigned cacheable : 1; |
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130 | /* access permissions for each of 4 subparts of a page |
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131 | * (for each 1KB when small pages used */ |
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132 | unsigned access_permission_0 : 2; |
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133 | unsigned access_permission_1 : 2; |
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134 | unsigned access_permission_2 : 2; |
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135 | unsigned access_permission_3 : 2; |
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136 | unsigned frame_base_addr : 20; |
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137 | } __attribute__ ((packed)) pte_level1_t; |
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138 | |||
139 | |||
140 | /* Level 1 page tables access permissions */ |
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141 | |||
2329 | kebrt | 142 | /** User mode: no access, privileged mode: no access. */ |
2276 | jancik | 143 | #define PTE_AP_USER_NO_KERNEL_NO 0 |
2329 | kebrt | 144 | /** User mode: no access, privileged mode: read/write. */ |
2276 | jancik | 145 | #define PTE_AP_USER_NO_KERNEL_RW 1 |
2329 | kebrt | 146 | /** User mode: read only, privileged mode: read/write. */ |
2276 | jancik | 147 | #define PTE_AP_USER_RO_KERNEL_RW 2 |
2329 | kebrt | 148 | /** User mode: read/write, privileged mode: read/write. */ |
2276 | jancik | 149 | #define PTE_AP_USER_RW_KERNEL_RW 3 |
150 | |||
151 | |||
152 | /* pte_level0_t and pte_level1_t descriptor_type flags */ |
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153 | |||
2329 | kebrt | 154 | /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type). */ |
2276 | jancik | 155 | #define PTE_DESCRIPTOR_NOT_PRESENT 0 |
2329 | kebrt | 156 | /** pte_level0_t coarse page table flag (used in descriptor_type). */ |
2276 | jancik | 157 | #define PTE_DESCRIPTOR_COARSE_TABLE 1 |
2329 | kebrt | 158 | /** pte_level1_t small page table flag (used in descriptor type). */ |
2276 | jancik | 159 | #define PTE_DESCRIPTOR_SMALL_PAGE 2 |
160 | |||
161 | |||
2329 | kebrt | 162 | /** Sets the address of level 0 page table. |
2241 | kebrt | 163 | * |
2329 | kebrt | 164 | * @param pt Pointer to the page table to set. |
2182 | jancik | 165 | */ |
2238 | kebrt | 166 | static inline void set_ptl0_addr( pte_level0_t* pt) |
167 | { |
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2276 | jancik | 168 | asm volatile ( |
169 | "mcr p15, 0, %0, c2, c0, 0 \n" |
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170 | : |
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171 | : "r"(pt) |
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172 | ); |
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2182 | jancik | 173 | } |
2128 | jermar | 174 | |
2329 | kebrt | 175 | |
2263 | kebrt | 176 | /** Returns level 0 page table entry flags. |
2241 | kebrt | 177 | * |
2329 | kebrt | 178 | * @param pt Level 0 page table. |
179 | * @param i Index of the entry to return. |
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2241 | kebrt | 180 | */ |
2147 | jancik | 181 | static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i) |
2128 | jermar | 182 | { |
2238 | kebrt | 183 | pte_level0_t *p = &pt[i]; |
2147 | jancik | 184 | |
2256 | kebrt | 185 | return |
186 | ( (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT ) | |
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2241 | kebrt | 187 | ( 1 << PAGE_USER_SHIFT ) | |
188 | ( 1 << PAGE_READ_SHIFT ) | |
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189 | ( 1 << PAGE_WRITE_SHIFT ) | |
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190 | ( 1 << PAGE_EXEC_SHIFT ) | |
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191 | ( 1 << PAGE_CACHEABLE_SHIFT ) |
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2256 | kebrt | 192 | ; |
2238 | kebrt | 193 | } |
2147 | jancik | 194 | |
2329 | kebrt | 195 | |
2263 | kebrt | 196 | /** Returns level 1 page table entry flags. |
2241 | kebrt | 197 | * |
2329 | kebrt | 198 | * @param pt Level 1 page table. |
199 | * @param i Index of the entry to return. |
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2241 | kebrt | 200 | */ |
2149 | jancik | 201 | static inline int get_pt_level1_flags(pte_level1_t *pt, index_t i) |
2147 | jancik | 202 | { |
2241 | kebrt | 203 | pte_level1_t *p = &pt[i]; |
2128 | jermar | 204 | |
2256 | kebrt | 205 | return |
206 | ( (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT) | |
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207 | ( (p->access_permission_0 == PTE_AP_USER_RO_KERNEL_RW) << PAGE_READ_SHIFT ) | |
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208 | ( (p->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW) << PAGE_READ_SHIFT ) | |
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209 | ( (p->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW) << PAGE_WRITE_SHIFT ) | |
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2259 | jancik | 210 | ( (p->access_permission_0 != PTE_AP_USER_NO_KERNEL_RW) << PAGE_USER_SHIFT ) | |
211 | ( (p->access_permission_0 == PTE_AP_USER_NO_KERNEL_RW) << PAGE_READ_SHIFT ) | |
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212 | ( (p->access_permission_0 == PTE_AP_USER_NO_KERNEL_RW) << PAGE_WRITE_SHIFT ) | |
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2147 | jancik | 213 | ( 1 << PAGE_EXEC_SHIFT ) | |
2241 | kebrt | 214 | ( p->bufferable << PAGE_CACHEABLE ) |
2256 | kebrt | 215 | ; |
2147 | jancik | 216 | } |
217 | |||
2329 | kebrt | 218 | |
2263 | kebrt | 219 | /** Sets flags of level 0 page table entry. |
2241 | kebrt | 220 | * |
2329 | kebrt | 221 | * @param pt level 0 page table |
222 | * @param i index of the entry to be changed |
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223 | * @param flags new flags |
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2241 | kebrt | 224 | */ |
2147 | jancik | 225 | static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags) |
2128 | jermar | 226 | { |
2147 | jancik | 227 | pte_level0_t *p = &pt[i]; |
2256 | kebrt | 228 | |
2241 | kebrt | 229 | if (flags & PAGE_NOT_PRESENT) { |
2256 | kebrt | 230 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
2263 | kebrt | 231 | // ensures that the entry will be recognized as valid when PTE_VALID_ARCH applied |
2259 | jancik | 232 | p->should_be_zero = 1; |
2238 | kebrt | 233 | } else { |
2256 | kebrt | 234 | p->descriptor_type = PTE_DESCRIPTOR_COARSE_TABLE; |
2259 | jancik | 235 | p->should_be_zero = 0; |
2147 | jancik | 236 | } |
2128 | jermar | 237 | } |
238 | |||
2329 | kebrt | 239 | |
2263 | kebrt | 240 | /** Sets flags of level 1 page table entry. |
2241 | kebrt | 241 | * |
2263 | kebrt | 242 | * We use same access rights for the whole page. When page is not preset we |
243 | * store 1 in acess_rigts_3 so that at least one bit is 1 (to mark correct |
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244 | * page entry, see #PAGE_VALID_ARCH). |
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2241 | kebrt | 245 | * |
2329 | kebrt | 246 | * @param pt Level 1 page table. |
247 | * @param i Index of the entry to be changed. |
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248 | * @param flags New flags. |
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2147 | jancik | 249 | */ |
250 | static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags) |
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251 | { |
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252 | pte_level1_t *p = &pt[i]; |
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253 | |||
2241 | kebrt | 254 | if (flags & PAGE_NOT_PRESENT) { |
2256 | kebrt | 255 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
2259 | jancik | 256 | p->access_permission_3 = 1; |
2238 | kebrt | 257 | } else { |
2256 | kebrt | 258 | p->descriptor_type = PTE_DESCRIPTOR_SMALL_PAGE; |
2259 | jancik | 259 | p->access_permission_3 = p->access_permission_0; |
2238 | kebrt | 260 | } |
2147 | jancik | 261 | |
2238 | kebrt | 262 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
263 | |||
2241 | kebrt | 264 | /* default access permission */ |
2238 | kebrt | 265 | p->access_permission_0 = p->access_permission_1 = |
2256 | kebrt | 266 | p->access_permission_2 = p->access_permission_3 = PTE_AP_USER_NO_KERNEL_RW; |
2238 | kebrt | 267 | |
2241 | kebrt | 268 | if (flags & PAGE_USER) { |
269 | if (flags & PAGE_READ) { |
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2238 | kebrt | 270 | p->access_permission_0 = p->access_permission_1 = |
271 | p->access_permission_2 = p->access_permission_3 = |
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2256 | kebrt | 272 | PTE_AP_USER_RO_KERNEL_RW; |
2238 | kebrt | 273 | } |
2241 | kebrt | 274 | if (flags & PAGE_WRITE) { |
2238 | kebrt | 275 | p->access_permission_0 = p->access_permission_1 = |
276 | p->access_permission_2 = p->access_permission_3 = |
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2256 | kebrt | 277 | PTE_AP_USER_RW_KERNEL_RW; |
2238 | kebrt | 278 | } |
279 | } |
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2147 | jancik | 280 | } |
281 | |||
2258 | jancik | 282 | |
2128 | jermar | 283 | extern void page_arch_init(void); |
284 | |||
2258 | jancik | 285 | |
2128 | jermar | 286 | #endif /* __ASM__ */ |
287 | |||
288 | #endif /* KERNEL */ |
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289 | |||
290 | #endif |
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291 | |||
292 | /** @} |
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293 | */ |
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2147 | jancik | 294 |