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