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219 | palkovsky | 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 | |||
540 | jermar | 29 | #include <arch/mm/page.h> |
684 | jermar | 30 | #include <genarch/mm/page_pt.h> |
540 | jermar | 31 | #include <arch/mm/frame.h> |
219 | palkovsky | 32 | #include <mm/page.h> |
226 | palkovsky | 33 | #include <mm/frame.h> |
755 | jermar | 34 | #include <mm/as.h> |
226 | palkovsky | 35 | #include <arch/interrupt.h> |
36 | #include <arch/asm.h> |
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37 | #include <config.h> |
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38 | #include <memstr.h> |
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576 | palkovsky | 39 | #include <interrupt.h> |
1051 | jermar | 40 | #include <print.h> |
41 | #include <panic.h> |
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1063 | palkovsky | 42 | #include <align.h> |
226 | palkovsky | 43 | |
1051 | jermar | 44 | /* Definitions for identity page mapper */ |
45 | pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE))); |
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46 | pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE))); |
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47 | pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE))); |
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48 | extern pte_t ptl_0; /* From boot.S */ |
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49 | |||
50 | #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
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51 | #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
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52 | #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
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53 | |||
54 | #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page)))) |
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55 | #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page)))) |
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56 | #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page)))) |
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57 | |||
58 | #define SETUP_PTL1(ptl0, page, tgt) { \ |
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59 | SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
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60 | SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
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61 | } |
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62 | #define SETUP_PTL2(ptl1, page, tgt) { \ |
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63 | SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
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64 | SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
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65 | } |
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66 | #define SETUP_PTL3(ptl2, page, tgt) { \ |
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67 | SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
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68 | SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
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69 | } |
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70 | #define SETUP_FRAME(ptl3, page, tgt) { \ |
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71 | SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
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72 | SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
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73 | } |
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1382 | decky | 74 | |
75 | |||
219 | palkovsky | 76 | void page_arch_init(void) |
77 | { |
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540 | jermar | 78 | __address cur; |
1063 | palkovsky | 79 | int i; |
80 | int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL; |
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226 | palkovsky | 81 | |
82 | if (config.cpu_active == 1) { |
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793 | jermar | 83 | page_mapping_operations = &pt_mapping_operations; |
814 | palkovsky | 84 | |
226 | palkovsky | 85 | /* |
86 | * PA2KA(identity) mapping for all frames. |
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87 | */ |
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540 | jermar | 88 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
1063 | palkovsky | 89 | /* Standard identity mapping */ |
1064 | palkovsky | 90 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags); |
226 | palkovsky | 91 | } |
1063 | palkovsky | 92 | /* Upper kernel mapping |
93 | * - from zero to top of kernel (include bottom addresses |
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94 | * because some are needed for init ) |
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95 | */ |
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96 | for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) { |
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97 | page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags); |
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98 | } |
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99 | for (i=0; i < init.cnt; i++) { |
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100 | for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) { |
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101 | page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags); |
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102 | } |
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103 | } |
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104 | |||
799 | palkovsky | 105 | exc_register(14, "page_fault", (iroutine)page_fault); |
756 | jermar | 106 | write_cr3((__address) AS_KERNEL->page_table); |
226 | palkovsky | 107 | } |
108 | else { |
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756 | jermar | 109 | write_cr3((__address) AS_KERNEL->page_table); |
226 | palkovsky | 110 | } |
219 | palkovsky | 111 | } |
1051 | jermar | 112 | |
1382 | decky | 113 | |
1051 | jermar | 114 | /** Identity page mapper |
115 | * |
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116 | * We need to map whole physical memory identically before the page subsystem |
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117 | * is initializaed. This thing clears page table and fills in the specific |
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118 | * items. |
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119 | */ |
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120 | void ident_page_fault(int n, istate_t *istate) |
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121 | { |
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122 | __address page; |
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123 | static __address oldpage = 0; |
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124 | pte_t *aptl_1, *aptl_2, *aptl_3; |
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125 | |||
126 | page = read_cr2(); |
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127 | if (oldpage) { |
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128 | /* Unmap old address */ |
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129 | aptl_1 = PTL1_ADDR(&ptl_0, oldpage); |
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130 | aptl_2 = PTL2_ADDR(aptl_1, oldpage); |
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131 | aptl_3 = PTL3_ADDR(aptl_2, oldpage); |
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132 | |||
133 | SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
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1064 | palkovsky | 134 | if (KA2PA(aptl_3) == KA2PA(helper_ptl3)) |
1051 | jermar | 135 | SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
1064 | palkovsky | 136 | if (KA2PA(aptl_2) == KA2PA(helper_ptl2)) |
1051 | jermar | 137 | SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
1064 | palkovsky | 138 | if (KA2PA(aptl_1) == KA2PA(helper_ptl1)) |
1051 | jermar | 139 | SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
140 | } |
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141 | if (PTL1_PRESENT(&ptl_0, page)) |
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142 | aptl_1 = PTL1_ADDR(&ptl_0, page); |
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143 | else { |
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144 | SETUP_PTL1(&ptl_0, page, helper_ptl1); |
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145 | aptl_1 = helper_ptl1; |
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146 | } |
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147 | |||
148 | if (PTL2_PRESENT(aptl_1, page)) |
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149 | aptl_2 = PTL2_ADDR(aptl_1, page); |
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150 | else { |
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151 | SETUP_PTL2(aptl_1, page, helper_ptl2); |
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152 | aptl_2 = helper_ptl2; |
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153 | } |
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154 | |||
155 | if (PTL3_PRESENT(aptl_2, page)) |
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156 | aptl_3 = PTL3_ADDR(aptl_2, page); |
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157 | else { |
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158 | SETUP_PTL3(aptl_2, page, helper_ptl3); |
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159 | aptl_3 = helper_ptl3; |
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160 | } |
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161 | |||
162 | SETUP_FRAME(aptl_3, page, page); |
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163 | |||
164 | oldpage = page; |
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165 | } |
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166 | |||
1382 | decky | 167 | |
1051 | jermar | 168 | void page_fault(int n, istate_t *istate) |
169 | { |
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170 | __address page; |
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1411 | jermar | 171 | pf_access_t access; |
1051 | jermar | 172 | |
173 | page = read_cr2(); |
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1411 | jermar | 174 | |
175 | if (istate->error_word & PFERR_CODE_RSVD) |
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176 | panic("Reserved bit set in page table entry.\n"); |
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177 | |||
178 | if (istate->error_word & PFERR_CODE_RW) |
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179 | access = PF_ACCESS_WRITE; |
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180 | else if (istate->error_word & PFERR_CODE_ID) |
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181 | access = PF_ACCESS_EXEC; |
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182 | else |
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183 | access = PF_ACCESS_READ; |
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184 | |||
185 | if (as_page_fault(page, access, istate) == AS_PF_FAULT) { |
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1595 | palkovsky | 186 | fault_if_from_uspace(istate, "Page fault: %#x", page); |
187 | |||
1051 | jermar | 188 | print_info_errcode(n, istate); |
1212 | palkovsky | 189 | printf("Page fault address: %llX\n", page); |
1051 | jermar | 190 | panic("page fault\n"); |
191 | } |
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192 | } |
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1382 | decky | 193 | |
194 | |||
195 | __address hw_map(__address physaddr, size_t size) |
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196 | { |
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197 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) |
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198 | panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
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199 | |||
200 | __address virtaddr = PA2KA(last_frame); |
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201 | pfn_t i; |
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202 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) |
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203 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE); |
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204 | |||
205 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
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206 | |||
207 | return virtaddr; |
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208 | } |