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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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33 | */ |
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34 | |||
35 | #ifndef KERN_arm32_PAGE_H_ |
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36 | #define KERN_arm32_PAGE_H_ |
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37 | |||
38 | #include <arch/mm/frame.h> |
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2182 | jancik | 39 | #include <mm/mm.h> |
40 | #include <arch/exception.h> |
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2128 | jermar | 41 | |
2182 | jancik | 42 | |
2128 | jermar | 43 | #define PAGE_WIDTH FRAME_WIDTH |
44 | #define PAGE_SIZE FRAME_SIZE |
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45 | |||
46 | #define PAGE_COLOR_BITS 0 /* dummy */ |
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47 | |||
48 | #ifndef __ASM__ |
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49 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
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50 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
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51 | #else |
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52 | # define KA2PA(x) ((x) - 0x80000000) |
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53 | # define PA2KA(x) ((x) + 0x80000000) |
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54 | #endif |
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55 | |||
56 | #ifdef KERNEL |
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57 | |||
2238 | kebrt | 58 | #define PTL0_ENTRIES_ARCH (2<<12) // 4096 |
59 | #define PTL1_ENTRIES_ARCH 0 |
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60 | #define PTL2_ENTRIES_ARCH 0 |
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2241 | kebrt | 61 | /* coarse page tables used (256*4 = 1KB per page) */ |
2238 | kebrt | 62 | #define PTL3_ENTRIES_ARCH (2<<8) // 256 |
2128 | jermar | 63 | |
2238 | kebrt | 64 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
65 | #define PTL1_INDEX_ARCH(vaddr) 0 |
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2241 | kebrt | 66 | #define PTL2_INDEX_ARCH(vaddr) 0 |
67 | /* TODO: ?? 0xfff or 0x0ff */ |
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68 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0xfff) |
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2128 | jermar | 69 | |
2238 | kebrt | 70 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *)( (((pte_level0_t*)(ptl0))[(i)]).coarse_table_addr << 10 )) |
71 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
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72 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
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73 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((uintptr_t)( (((pte_level1_t*)(ptl3))[(i)]).frame_base_addr << 12 )) |
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2128 | jermar | 74 | |
2238 | kebrt | 75 | #define SET_PTL0_ADDRESS_ARCH(ptl0) (set_ptl0_addr((pte_level0_t *)(ptl0))) |
76 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_level0_t *)(ptl0))[(i)].coarse_table_addr = (a)>>10) |
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2147 | jancik | 77 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
78 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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2182 | jancik | 79 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12) |
2128 | jermar | 80 | |
2238 | kebrt | 81 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i)) |
82 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
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83 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
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84 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i)) |
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2128 | jermar | 85 | |
2238 | kebrt | 86 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i), (x)) |
2147 | jancik | 87 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
88 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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2238 | kebrt | 89 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x)) |
2128 | jermar | 90 | |
2182 | jancik | 91 | #define PTE_VALID_ARCH(pte) (*((uint32_t *) (pte)) != 0) |
2241 | kebrt | 92 | // TODO: ?? != 0 |
93 | #define PTE_PRESENT_ARCH(pte) ( ((pte_level0_t *)(pte))->descriptor_type != 0 ) |
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94 | |||
95 | /* pte should point into ptl3 */ |
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2238 | kebrt | 96 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
2241 | kebrt | 97 | /* pte should point into ptl3 */ |
2238 | kebrt | 98 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == pte_ap_user_rw_kernel_rw ) |
2241 | kebrt | 99 | |
2238 | kebrt | 100 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
2128 | jermar | 101 | |
102 | #ifndef __ASM__ |
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103 | |||
2241 | kebrt | 104 | /** |
105 | * Sets the address of level 0 page table. |
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106 | * |
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107 | * \param pt pointer to the page table to set |
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2182 | jancik | 108 | */ |
2238 | kebrt | 109 | static inline void set_ptl0_addr( pte_level0_t* pt) |
110 | { |
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2199 | jancik | 111 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
2238 | kebrt | 112 | : |
113 | : "r"(pt) |
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2182 | jancik | 114 | ); |
115 | |||
116 | } |
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2128 | jermar | 117 | |
2241 | kebrt | 118 | /** |
119 | * Returns level 0 page table entry flags. |
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120 | * |
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121 | * \param pt level 0 page table |
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122 | * \param i index of the entry to return |
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123 | */ |
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2147 | jancik | 124 | static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i) |
2128 | jermar | 125 | { |
2238 | kebrt | 126 | pte_level0_t *p = &pt[i]; |
2147 | jancik | 127 | |
128 | return ( |
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2149 | jancik | 129 | ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT | |
2241 | kebrt | 130 | ( 1 << PAGE_USER_SHIFT ) | |
131 | ( 1 << PAGE_READ_SHIFT ) | |
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132 | ( 1 << PAGE_WRITE_SHIFT ) | |
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133 | ( 1 << PAGE_EXEC_SHIFT ) | |
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134 | ( 1 << PAGE_CACHEABLE_SHIFT ) |
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2147 | jancik | 135 | ); |
2238 | kebrt | 136 | } |
2147 | jancik | 137 | |
2241 | kebrt | 138 | /** |
139 | * Returns level 1 page table entry flags. |
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140 | * |
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141 | * \param pt level 1 page table |
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142 | * \param i index of the entry to return |
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143 | */ |
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2149 | jancik | 144 | static inline int get_pt_level1_flags(pte_level1_t *pt, index_t i) |
2147 | jancik | 145 | { |
2241 | kebrt | 146 | pte_level1_t *p = &pt[i]; |
2128 | jermar | 147 | |
2147 | jancik | 148 | return ( |
2149 | jancik | 149 | ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT | |
2147 | jancik | 150 | ( (p->access_permission_0 == pte_ap_user_ro_kernel_rw) << PAGE_READ_SHIFT ) | |
151 | ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_READ_SHIFT ) | |
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152 | ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_WRITE_SHIFT ) | |
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2182 | jancik | 153 | ( (p->access_permission_0 != pte_ap_user_no_kernel_rw) << PAGE_USER_SHIFT ) | |
2147 | jancik | 154 | ( 1 << PAGE_EXEC_SHIFT ) | |
2241 | kebrt | 155 | ( p->bufferable << PAGE_CACHEABLE ) |
2147 | jancik | 156 | ); |
157 | } |
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158 | |||
2241 | kebrt | 159 | /** |
160 | * Sets flags of level 0 page table entry. |
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161 | * |
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162 | * \param pt level 0 page table |
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163 | * \param i index of the entry to be changed |
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164 | * \param flags new flags |
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165 | * |
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166 | * TODO: why should_be_zero set to 1? |
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167 | */ |
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2147 | jancik | 168 | static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags) |
2128 | jermar | 169 | { |
2147 | jancik | 170 | pte_level0_t *p = &pt[i]; |
171 | |||
2241 | kebrt | 172 | if (flags & PAGE_NOT_PRESENT) { |
2238 | kebrt | 173 | p->descriptor_type = pte_descriptor_not_preset; |
174 | p->should_be_zero = 1; |
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175 | } else { |
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176 | p->descriptor_type = pte_descriptor_coarse_table; |
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177 | p->should_be_zero = 0; |
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2147 | jancik | 178 | } |
2128 | jermar | 179 | } |
180 | |||
2241 | kebrt | 181 | /** |
182 | * Sets flags of level 1 page table entry. |
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183 | * |
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184 | * We use same access rights for the whole page. When page is not preset then |
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185 | * store 1 in acess_rigts_3. |
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186 | * TODO: why access_right_3? |
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187 | * |
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188 | * \param pt level 1 page table |
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189 | * \param i index of the entry to be changed |
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190 | * \param flags new flags |
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2147 | jancik | 191 | */ |
192 | static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags) |
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193 | { |
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194 | pte_level1_t *p = &pt[i]; |
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195 | |||
2241 | kebrt | 196 | if (flags & PAGE_NOT_PRESENT) { |
2238 | kebrt | 197 | p->descriptor_type = pte_descriptor_not_preset; |
198 | p->access_permission_3 = 1; |
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199 | } else { |
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2241 | kebrt | 200 | p->descriptor_type = pte_descriptor_small_page; |
2238 | kebrt | 201 | p->access_permission_3 = p->access_permission_0; |
202 | } |
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2147 | jancik | 203 | |
2238 | kebrt | 204 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
205 | |||
2241 | kebrt | 206 | /* default access permission */ |
2238 | kebrt | 207 | p->access_permission_0 = p->access_permission_1 = |
208 | p->access_permission_2 = p->access_permission_3 = pte_ap_user_no_kernel_rw; |
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209 | |||
2241 | kebrt | 210 | if (flags & PAGE_USER) { |
211 | if (flags & PAGE_READ) { |
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2238 | kebrt | 212 | p->access_permission_0 = p->access_permission_1 = |
213 | p->access_permission_2 = p->access_permission_3 = |
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214 | pte_ap_user_ro_kernel_rw; |
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215 | } |
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2241 | kebrt | 216 | if (flags & PAGE_WRITE) { |
2238 | kebrt | 217 | p->access_permission_0 = p->access_permission_1 = |
218 | p->access_permission_2 = p->access_permission_3 = |
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219 | pte_ap_user_rw_kernel_rw; |
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220 | } |
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221 | } |
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2147 | jancik | 222 | } |
223 | |||
2128 | jermar | 224 | extern void page_arch_init(void); |
225 | |||
226 | #endif /* __ASM__ */ |
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227 | |||
228 | #endif /* KERNEL */ |
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229 | |||
230 | #endif |
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231 | |||
232 | /** @} |
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233 | */ |
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2147 | jancik | 234 |