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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 | |
2242 | kebrt | 64 | #define PTL0_SIZE_ARCH FOUR_FRAMES |
65 | #define PTL1_SIZE_ARCH 0 |
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66 | #define PTL2_SIZE_ARCH 0 |
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67 | #define PTL3_SIZE_ARCH ONE_FRAME |
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68 | |||
2238 | kebrt | 69 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
70 | #define PTL1_INDEX_ARCH(vaddr) 0 |
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2241 | kebrt | 71 | #define PTL2_INDEX_ARCH(vaddr) 0 |
72 | /* TODO: ?? 0xfff or 0x0ff */ |
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73 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0xfff) |
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2128 | jermar | 74 | |
2238 | kebrt | 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 | |
2238 | kebrt | 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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2182 | jancik | 84 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12) |
2128 | jermar | 85 | |
2238 | kebrt | 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 | |
2238 | kebrt | 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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2238 | kebrt | 94 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x)) |
2128 | jermar | 95 | |
2182 | jancik | 96 | #define PTE_VALID_ARCH(pte) (*((uint32_t *) (pte)) != 0) |
2241 | kebrt | 97 | // TODO: ?? != 0 |
98 | #define PTE_PRESENT_ARCH(pte) ( ((pte_level0_t *)(pte))->descriptor_type != 0 ) |
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99 | |||
100 | /* pte should point into ptl3 */ |
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2238 | kebrt | 101 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
2241 | kebrt | 102 | /* pte should point into ptl3 */ |
2238 | kebrt | 103 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == pte_ap_user_rw_kernel_rw ) |
2241 | kebrt | 104 | |
2238 | kebrt | 105 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
2128 | jermar | 106 | |
107 | #ifndef __ASM__ |
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108 | |||
2241 | kebrt | 109 | /** |
110 | * Sets the address of level 0 page table. |
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111 | * |
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112 | * \param pt pointer to the page table to set |
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2182 | jancik | 113 | */ |
2238 | kebrt | 114 | static inline void set_ptl0_addr( pte_level0_t* pt) |
115 | { |
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2199 | jancik | 116 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
2238 | kebrt | 117 | : |
118 | : "r"(pt) |
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2182 | jancik | 119 | ); |
120 | |||
121 | } |
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2128 | jermar | 122 | |
2241 | kebrt | 123 | /** |
124 | * Returns level 0 page table entry flags. |
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125 | * |
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126 | * \param pt level 0 page table |
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127 | * \param i index of the entry to return |
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128 | */ |
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2147 | jancik | 129 | static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i) |
2128 | jermar | 130 | { |
2238 | kebrt | 131 | pte_level0_t *p = &pt[i]; |
2147 | jancik | 132 | |
133 | return ( |
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2149 | jancik | 134 | ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT | |
2241 | kebrt | 135 | ( 1 << PAGE_USER_SHIFT ) | |
136 | ( 1 << PAGE_READ_SHIFT ) | |
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137 | ( 1 << PAGE_WRITE_SHIFT ) | |
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138 | ( 1 << PAGE_EXEC_SHIFT ) | |
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139 | ( 1 << PAGE_CACHEABLE_SHIFT ) |
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2147 | jancik | 140 | ); |
2238 | kebrt | 141 | } |
2147 | jancik | 142 | |
2241 | kebrt | 143 | /** |
144 | * Returns level 1 page table entry flags. |
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145 | * |
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146 | * \param pt level 1 page table |
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147 | * \param i index of the entry to return |
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148 | */ |
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2149 | jancik | 149 | static inline int get_pt_level1_flags(pte_level1_t *pt, index_t i) |
2147 | jancik | 150 | { |
2241 | kebrt | 151 | pte_level1_t *p = &pt[i]; |
2128 | jermar | 152 | |
2147 | jancik | 153 | return ( |
2149 | jancik | 154 | ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT | |
2147 | jancik | 155 | ( (p->access_permission_0 == pte_ap_user_ro_kernel_rw) << PAGE_READ_SHIFT ) | |
156 | ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_READ_SHIFT ) | |
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157 | ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_WRITE_SHIFT ) | |
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2182 | jancik | 158 | ( (p->access_permission_0 != pte_ap_user_no_kernel_rw) << PAGE_USER_SHIFT ) | |
2147 | jancik | 159 | ( 1 << PAGE_EXEC_SHIFT ) | |
2241 | kebrt | 160 | ( p->bufferable << PAGE_CACHEABLE ) |
2147 | jancik | 161 | ); |
162 | } |
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163 | |||
2241 | kebrt | 164 | /** |
165 | * Sets flags of level 0 page table entry. |
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166 | * |
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167 | * \param pt level 0 page table |
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168 | * \param i index of the entry to be changed |
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169 | * \param flags new flags |
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170 | * |
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171 | * TODO: why should_be_zero set to 1? |
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172 | */ |
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2147 | jancik | 173 | static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags) |
2128 | jermar | 174 | { |
2147 | jancik | 175 | pte_level0_t *p = &pt[i]; |
176 | |||
2241 | kebrt | 177 | if (flags & PAGE_NOT_PRESENT) { |
2238 | kebrt | 178 | p->descriptor_type = pte_descriptor_not_preset; |
179 | p->should_be_zero = 1; |
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180 | } else { |
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181 | p->descriptor_type = pte_descriptor_coarse_table; |
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182 | p->should_be_zero = 0; |
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2147 | jancik | 183 | } |
2128 | jermar | 184 | } |
185 | |||
2241 | kebrt | 186 | /** |
187 | * Sets flags of level 1 page table entry. |
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188 | * |
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189 | * We use same access rights for the whole page. When page is not preset then |
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190 | * store 1 in acess_rigts_3. |
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191 | * TODO: why access_right_3? |
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192 | * |
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193 | * \param pt level 1 page table |
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194 | * \param i index of the entry to be changed |
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195 | * \param flags new flags |
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2147 | jancik | 196 | */ |
197 | static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags) |
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198 | { |
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199 | pte_level1_t *p = &pt[i]; |
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200 | |||
2241 | kebrt | 201 | if (flags & PAGE_NOT_PRESENT) { |
2238 | kebrt | 202 | p->descriptor_type = pte_descriptor_not_preset; |
203 | p->access_permission_3 = 1; |
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204 | } else { |
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2241 | kebrt | 205 | p->descriptor_type = pte_descriptor_small_page; |
2238 | kebrt | 206 | p->access_permission_3 = p->access_permission_0; |
207 | } |
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2147 | jancik | 208 | |
2238 | kebrt | 209 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
210 | |||
2241 | kebrt | 211 | /* default access permission */ |
2238 | kebrt | 212 | p->access_permission_0 = p->access_permission_1 = |
213 | p->access_permission_2 = p->access_permission_3 = pte_ap_user_no_kernel_rw; |
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214 | |||
2241 | kebrt | 215 | if (flags & PAGE_USER) { |
216 | if (flags & PAGE_READ) { |
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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_ro_kernel_rw; |
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220 | } |
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2241 | kebrt | 221 | if (flags & PAGE_WRITE) { |
2238 | kebrt | 222 | p->access_permission_0 = p->access_permission_1 = |
223 | p->access_permission_2 = p->access_permission_3 = |
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224 | pte_ap_user_rw_kernel_rw; |
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225 | } |
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226 | } |
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2147 | jancik | 227 | } |
228 | |||
2128 | jermar | 229 | extern void page_arch_init(void); |
230 | |||
231 | #endif /* __ASM__ */ |
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232 | |||
233 | #endif /* KERNEL */ |
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234 | |||
235 | #endif |
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236 | |||
237 | /** @} |
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238 | */ |
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2147 | jancik | 239 |