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1809 | decky | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * All rights reserved. |
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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 xen32mm |
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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 __xen32_PAGE_H__ |
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36 | #define __xen32_PAGE_H__ |
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37 | |||
38 | #include <arch/mm/frame.h> |
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39 | |||
40 | #define PAGE_WIDTH FRAME_WIDTH |
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41 | #define PAGE_SIZE FRAME_SIZE |
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42 | |||
43 | #ifdef KERNEL |
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44 | |||
45 | #ifndef __ASM__ |
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46 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
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47 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
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48 | #else |
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49 | # define KA2PA(x) ((x) - 0x80000000) |
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50 | # define PA2KA(x) ((x) + 0x80000000) |
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51 | #endif |
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52 | |||
53 | /* |
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54 | * Implementation of generic 4-level page table interface. |
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55 | * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out. |
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56 | */ |
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57 | #define PTL0_ENTRIES_ARCH 1024 |
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58 | #define PTL1_ENTRIES_ARCH 0 |
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59 | #define PTL2_ENTRIES_ARCH 0 |
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60 | #define PTL3_ENTRIES_ARCH 1024 |
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61 | |||
1821 | decky | 62 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 22) & 0x3ff) |
1809 | decky | 63 | #define PTL1_INDEX_ARCH(vaddr) 0 |
64 | #define PTL2_INDEX_ARCH(vaddr) 0 |
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1821 | decky | 65 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x3ff) |
1809 | decky | 66 | |
1824 | decky | 67 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *) MA2PA((((pte_t *) (ptl0))[(i)].frame_address) << 12)) |
1809 | decky | 68 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
69 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
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1824 | decky | 70 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((uintptr_t) MA2PA((((pte_t *) (ptl3))[(i)].frame_address) << 12)) |
1809 | decky | 71 | |
1821 | decky | 72 | #define SET_PTL0_ADDRESS_ARCH(ptl0) { \ |
73 | mmuext_op_t mmu_ext; \ |
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1824 | decky | 74 | \ |
1821 | decky | 75 | mmu_ext.cmd = MMUEXT_NEW_BASEPTR; \ |
1824 | decky | 76 | mmu_ext.mfn = ADDR2PFN(PA2MA(ptl0)); \ |
1821 | decky | 77 | xen_mmuext_op(&mmu_ext, 1, NULL, DOMID_SELF); \ |
78 | } |
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1824 | decky | 79 | |
1821 | decky | 80 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) { \ |
81 | mmu_update_t update; \ |
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1824 | decky | 82 | \ |
1821 | decky | 83 | update.ptr = PA2MA(KA2PA(&((pte_t *) (ptl0))[(i)])); \ |
1824 | decky | 84 | update.val = PA2MA(a) | 0x0003; \ |
1821 | decky | 85 | xen_mmu_update(&update, 1, NULL, DOMID_SELF); \ |
86 | } |
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1809 | decky | 87 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
88 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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1824 | decky | 89 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_t *) (ptl3))[(i)].frame_address = PA2MA(a) >> 12) |
1809 | decky | 90 | |
1824 | decky | 91 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_flags((pte_t *) (ptl0), (index_t)(i)) |
1809 | decky | 92 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
93 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
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1824 | decky | 94 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_flags((pte_t *) (ptl3), (index_t)(i)) |
1809 | decky | 95 | |
1824 | decky | 96 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_flags((pte_t *) (ptl0), (index_t)(i), (x)) |
1809 | decky | 97 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
98 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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1824 | decky | 99 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_flags((pte_t *) (ptl3), (index_t)(i), (x)) |
1809 | decky | 100 | |
101 | #define PTE_VALID_ARCH(p) (*((uint32_t *) (p)) != 0) |
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102 | #define PTE_PRESENT_ARCH(p) ((p)->present != 0) |
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1821 | decky | 103 | #define PTE_GET_FRAME_ARCH(p) ((p)->frame_address << FRAME_WIDTH) |
1809 | decky | 104 | #define PTE_WRITABLE_ARCH(p) ((p)->writeable != 0) |
105 | #define PTE_EXECUTABLE_ARCH(p) 1 |
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106 | |||
107 | #ifndef __ASM__ |
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108 | |||
109 | #include <mm/page.h> |
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110 | #include <arch/types.h> |
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111 | #include <arch/mm/frame.h> |
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112 | #include <typedefs.h> |
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1824 | decky | 113 | #include <arch/hypercall.h> |
1809 | decky | 114 | |
115 | /* Page fault error codes. */ |
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116 | |||
117 | /** When bit on this position is 0, the page fault was caused by a not-present page. */ |
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1821 | decky | 118 | #define PFERR_CODE_P (1 << 0) |
1809 | decky | 119 | |
120 | /** When bit on this position is 1, the page fault was caused by a write. */ |
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1821 | decky | 121 | #define PFERR_CODE_RW (1 << 1) |
1809 | decky | 122 | |
123 | /** When bit on this position is 1, the page fault was caused in user mode. */ |
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1821 | decky | 124 | #define PFERR_CODE_US (1 << 2) |
1809 | decky | 125 | |
126 | /** When bit on this position is 1, a reserved bit was set in page directory. */ |
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1821 | decky | 127 | #define PFERR_CODE_RSVD (1 << 3) |
1809 | decky | 128 | |
129 | /** Page Table Entry. */ |
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130 | struct page_specifier { |
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131 | unsigned present : 1; |
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132 | unsigned writeable : 1; |
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133 | unsigned uaccessible : 1; |
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134 | unsigned page_write_through : 1; |
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135 | unsigned page_cache_disable : 1; |
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136 | unsigned accessed : 1; |
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137 | unsigned dirty : 1; |
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138 | unsigned pat : 1; |
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139 | unsigned global : 1; |
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140 | unsigned soft_valid : 1; /**< Valid content even if the present bit is not set. */ |
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141 | unsigned avl : 2; |
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142 | unsigned frame_address : 20; |
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143 | } __attribute__ ((packed)); |
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144 | |||
1824 | decky | 145 | typedef struct { |
146 | uint64_t ptr; /**< Machine address of PTE */ |
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147 | union { /**< New contents of PTE */ |
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148 | uint64_t val; |
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149 | pte_t pte; |
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150 | }; |
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151 | } mmu_update_t; |
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152 | |||
153 | typedef struct { |
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154 | unsigned int cmd; |
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155 | union { |
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156 | unsigned long mfn; |
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157 | unsigned long linear_addr; |
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158 | }; |
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159 | union { |
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160 | unsigned int nr_ents; |
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161 | void *vcpumask; |
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162 | }; |
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163 | } mmuext_op_t; |
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164 | |||
165 | static inline int xen_update_va_mapping(const void *va, const pte_t pte, const unsigned int flags) |
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166 | { |
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167 | return hypercall4(XEN_UPDATE_VA_MAPPING, va, pte, 0, flags); |
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168 | } |
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169 | |||
170 | static inline int xen_mmu_update(const mmu_update_t *req, const unsigned int count, unsigned int *success_count, domid_t domid) |
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171 | { |
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172 | return hypercall4(XEN_MMU_UPDATE, req, count, success_count, domid); |
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173 | } |
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174 | |||
175 | static inline int xen_mmuext_op(const mmuext_op_t *op, const unsigned int count, unsigned int *success_count, domid_t domid) |
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176 | { |
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177 | return hypercall4(XEN_MMUEXT_OP, op, count, success_count, domid); |
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178 | } |
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179 | |||
1809 | decky | 180 | static inline int get_pt_flags(pte_t *pt, index_t i) |
181 | { |
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182 | pte_t *p = &pt[i]; |
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183 | |||
184 | return ( |
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185 | (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT | |
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186 | (!p->present)<<PAGE_PRESENT_SHIFT | |
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187 | p->uaccessible<<PAGE_USER_SHIFT | |
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188 | 1<<PAGE_READ_SHIFT | |
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189 | p->writeable<<PAGE_WRITE_SHIFT | |
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190 | 1<<PAGE_EXEC_SHIFT | |
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191 | p->global<<PAGE_GLOBAL_SHIFT |
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192 | ); |
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193 | } |
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194 | |||
195 | static inline void set_pt_flags(pte_t *pt, index_t i, int flags) |
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196 | { |
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197 | pte_t *p = &pt[i]; |
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198 | |||
199 | p->page_cache_disable = !(flags & PAGE_CACHEABLE); |
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200 | p->present = !(flags & PAGE_NOT_PRESENT); |
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201 | p->uaccessible = (flags & PAGE_USER) != 0; |
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202 | p->writeable = (flags & PAGE_WRITE) != 0; |
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203 | p->global = (flags & PAGE_GLOBAL) != 0; |
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204 | |||
205 | /* |
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206 | * Ensure that there is at least one bit set even if the present bit is cleared. |
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207 | */ |
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208 | p->soft_valid = true; |
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209 | } |
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210 | |||
211 | extern void page_arch_init(void); |
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212 | extern void page_fault(int n, istate_t *istate); |
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213 | |||
214 | #endif /* __ASM__ */ |
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215 | |||
216 | #endif /* KERNEL */ |
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217 | |||
218 | #endif |
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219 | |||
220 | /** @} |
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221 | */ |