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162 | decky | 1 | /* |
2 | * Copyright (C) 2005 Martin Decky |
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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 | #include <arch/mm/page.h> |
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684 | jermar | 30 | #include <genarch/mm/page_pt.h> |
162 | decky | 31 | #include <arch/mm/frame.h> |
1374 | decky | 32 | #include <arch/asm.h> |
162 | decky | 33 | #include <mm/frame.h> |
34 | #include <mm/page.h> |
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1374 | decky | 35 | #include <mm/as.h> |
36 | #include <arch.h> |
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684 | jermar | 37 | #include <arch/types.h> |
1374 | decky | 38 | #include <arch/exception.h> |
1383 | decky | 39 | #include <align.h> |
1374 | decky | 40 | #include <config.h> |
41 | #include <print.h> |
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42 | #include <symtab.h> |
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162 | decky | 43 | |
1374 | decky | 44 | static phte_t *phte; |
45 | |||
46 | |||
47 | /** Try to find PTE for faulting address |
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48 | * |
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49 | * Try to find PTE for faulting address. |
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1383 | decky | 50 | * The as->lock must be held on entry to this function |
51 | * if lock is true. |
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1374 | decky | 52 | * |
1383 | decky | 53 | * @param as Address space. |
54 | * @param lock Lock/unlock the address space. |
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1374 | decky | 55 | * @param badvaddr Faulting virtual address. |
1378 | decky | 56 | * @param istate Pointer to interrupted state. |
57 | * @param pfrc Pointer to variable where as_page_fault() return code will be stored. |
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1374 | decky | 58 | * @return PTE on success, NULL otherwise. |
59 | * |
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60 | */ |
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1383 | decky | 61 | static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, istate_t *istate, int *pfcr) |
1374 | decky | 62 | { |
63 | /* |
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64 | * Check if the mapping exists in page tables. |
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65 | */ |
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1383 | decky | 66 | pte_t *pte = page_mapping_find(as, badvaddr); |
1374 | decky | 67 | if ((pte) && (pte->p)) { |
68 | /* |
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69 | * Mapping found in page tables. |
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70 | * Immediately succeed. |
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71 | */ |
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72 | return pte; |
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73 | } else { |
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74 | int rc; |
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75 | |||
76 | /* |
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77 | * Mapping not found in page tables. |
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78 | * Resort to higher-level page fault handler. |
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79 | */ |
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1383 | decky | 80 | page_table_unlock(as, lock); |
1374 | decky | 81 | switch (rc = as_page_fault(badvaddr, istate)) { |
82 | case AS_PF_OK: |
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83 | /* |
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84 | * The higher-level page fault handler succeeded, |
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85 | * The mapping ought to be in place. |
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86 | */ |
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1383 | decky | 87 | page_table_lock(as, lock); |
88 | pte = page_mapping_find(as, badvaddr); |
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1374 | decky | 89 | ASSERT((pte) && (pte->p)); |
90 | return pte; |
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91 | case AS_PF_DEFER: |
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1383 | decky | 92 | page_table_lock(as, lock); |
1374 | decky | 93 | *pfcr = rc; |
94 | return NULL; |
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95 | case AS_PF_FAULT: |
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1383 | decky | 96 | page_table_lock(as, lock); |
1374 | decky | 97 | printf("Page fault.\n"); |
98 | *pfcr = rc; |
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99 | return NULL; |
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100 | default: |
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101 | panic("unexpected rc (%d)\n", rc); |
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102 | } |
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103 | } |
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104 | } |
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105 | |||
106 | |||
107 | static void pht_refill_fail(__address badvaddr, istate_t *istate) |
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108 | { |
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109 | char *symbol = ""; |
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110 | char *sym2 = ""; |
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111 | |||
112 | char *s = get_symtab_entry(istate->pc); |
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113 | if (s) |
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114 | symbol = s; |
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115 | s = get_symtab_entry(istate->lr); |
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116 | if (s) |
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117 | sym2 = s; |
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118 | panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2); |
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119 | } |
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120 | |||
1378 | decky | 121 | |
1374 | decky | 122 | static void pht_insert(const __address vaddr, const pfn_t pfn) |
123 | { |
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124 | __u32 page = (vaddr >> 12) & 0xffff; |
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125 | __u32 api = (vaddr >> 22) & 0x3f; |
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126 | __u32 vsid; |
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127 | |||
128 | asm volatile ( |
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129 | "mfsrin %0, %1\n" |
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130 | : "=r" (vsid) |
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131 | : "r" (vaddr) |
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132 | ); |
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133 | |||
134 | /* Primary hash (xor) */ |
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135 | __u32 hash = ((vsid ^ page) & 0x3ff) << 3; |
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136 | |||
137 | __u32 i; |
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1378 | decky | 138 | bool found = false; |
1374 | decky | 139 | /* Find unused PTE in PTEG */ |
140 | for (i = 0; i < 8; i++) { |
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1378 | decky | 141 | if (!phte[hash + i].v) { |
142 | found = true; |
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1374 | decky | 143 | break; |
1378 | decky | 144 | } |
1374 | decky | 145 | } |
146 | |||
1378 | decky | 147 | if (!found) { |
148 | /* Secondary hash (not) */ |
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149 | hash = ~hash; |
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150 | |||
151 | /* Find unused PTE in PTEG */ |
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152 | for (i = 0; i < 8; i++) { |
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153 | if (!phte[hash + i].v) { |
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154 | found = true; |
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155 | break; |
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156 | } |
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157 | } |
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158 | |||
159 | if (!found) { |
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160 | // TODO: A/C precedence groups |
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161 | i = page % 8; |
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162 | } |
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163 | } |
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1374 | decky | 164 | |
165 | phte[hash + i].v = 1; |
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166 | phte[hash + i].vsid = vsid; |
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167 | phte[hash + i].h = 0; |
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168 | phte[hash + i].api = api; |
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169 | phte[hash + i].rpn = pfn; |
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170 | phte[hash + i].r = 0; |
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171 | phte[hash + i].c = 0; |
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172 | phte[hash + i].pp = 2; // FIXME |
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173 | } |
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174 | |||
175 | |||
176 | /** Process Instruction/Data Storage Interrupt |
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177 | * |
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178 | * @param data True if Data Storage Interrupt. |
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179 | * @param istate Interrupted register context. |
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180 | * |
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181 | */ |
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182 | void pht_refill(bool data, istate_t *istate) |
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183 | { |
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184 | asid_t asid; |
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185 | __address badvaddr; |
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186 | pte_t *pte; |
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187 | int pfcr; |
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1383 | decky | 188 | as_t *as; |
189 | bool lock; |
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1374 | decky | 190 | |
1383 | decky | 191 | if (AS == NULL) { |
192 | as = AS_KERNEL; |
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193 | lock = false; |
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194 | } else { |
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195 | as = AS; |
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196 | lock = true; |
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197 | } |
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198 | |||
1374 | decky | 199 | if (data) { |
200 | asm volatile ( |
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201 | "mfdar %0\n" |
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202 | : "=r" (badvaddr) |
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203 | ); |
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204 | } else |
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205 | badvaddr = istate->pc; |
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206 | |||
1383 | decky | 207 | spinlock_lock(&as->lock); |
208 | asid = as->asid; |
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209 | spinlock_unlock(&as->lock); |
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1374 | decky | 210 | |
1383 | decky | 211 | page_table_lock(as, lock); |
1374 | decky | 212 | |
1383 | decky | 213 | pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr); |
1374 | decky | 214 | if (!pte) { |
215 | switch (pfcr) { |
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1378 | decky | 216 | case AS_PF_FAULT: |
217 | goto fail; |
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218 | break; |
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219 | case AS_PF_DEFER: |
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220 | /* |
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221 | * The page fault came during copy_from_uspace() |
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222 | * or copy_to_uspace(). |
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223 | */ |
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1383 | decky | 224 | page_table_unlock(as, lock); |
1378 | decky | 225 | return; |
226 | default: |
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227 | panic("Unexpected pfrc (%d)\n", pfcr); |
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1374 | decky | 228 | } |
229 | } |
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230 | |||
231 | pte->a = 1; /* Record access to PTE */ |
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232 | pht_insert(badvaddr, pte->pfn); |
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233 | |||
1383 | decky | 234 | page_table_unlock(as, lock); |
1374 | decky | 235 | return; |
236 | |||
237 | fail: |
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1383 | decky | 238 | page_table_unlock(as, lock); |
1374 | decky | 239 | pht_refill_fail(badvaddr, istate); |
240 | } |
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241 | |||
242 | |||
243 | void pht_init(void) |
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244 | { |
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245 | memsetb((__address) phte, 1 << PHT_BITS, 0); |
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246 | } |
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247 | |||
248 | |||
162 | decky | 249 | void page_arch_init(void) |
250 | { |
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1374 | decky | 251 | if (config.cpu_active == 1) { |
252 | page_mapping_operations = &pt_mapping_operations; |
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253 | |||
254 | /* Allocate page hash table */ |
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255 | phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC)); |
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256 | phte = (phte_t *) PA2KA((__address) physical_phte); |
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257 | |||
258 | ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0); |
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259 | pht_init(); |
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260 | |||
261 | asm volatile ( |
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262 | "mtsdr1 %0\n" |
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263 | : |
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264 | : "r" ((__address) physical_phte) |
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265 | ); |
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266 | } |
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162 | decky | 267 | } |
1383 | decky | 268 | |
269 | |||
270 | __address hw_map(__address physaddr, size_t size) |
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271 | { |
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272 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) |
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273 | panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
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274 | |||
275 | __address virtaddr = PA2KA(last_frame); |
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276 | pfn_t i; |
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277 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) |
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278 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE); |
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279 | |||
280 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
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281 | |||
282 | return virtaddr; |
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283 | } |