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1 | /* |
1 | /* |
2 | * Copyright (C) 2003-2004 Jakub Jermar |
2 | * Copyright (C) 2003-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <arch/mm/tlb.h> |
29 | #include <arch/mm/tlb.h> |
30 | #include <mm/asid.h> |
30 | #include <mm/asid.h> |
31 | #include <mm/tlb.h> |
31 | #include <mm/tlb.h> |
32 | #include <mm/page.h> |
32 | #include <mm/page.h> |
33 | #include <mm/as.h> |
33 | #include <mm/as.h> |
34 | #include <arch/cp0.h> |
34 | #include <arch/cp0.h> |
35 | #include <panic.h> |
35 | #include <panic.h> |
36 | #include <arch.h> |
36 | #include <arch.h> |
37 | #include <symtab.h> |
37 | #include <symtab.h> |
38 | #include <synch/spinlock.h> |
38 | #include <synch/spinlock.h> |
39 | #include <print.h> |
39 | #include <print.h> |
40 | #include <debug.h> |
40 | #include <debug.h> |
41 | #include <align.h> |
41 | #include <align.h> |
42 | 42 | ||
43 | static void tlb_refill_fail(istate_t *istate); |
43 | static void tlb_refill_fail(istate_t *istate); |
44 | static void tlb_invalid_fail(istate_t *istate); |
44 | static void tlb_invalid_fail(istate_t *istate); |
45 | static void tlb_modified_fail(istate_t *istate); |
45 | static void tlb_modified_fail(istate_t *istate); |
46 | 46 | ||
47 | static pte_t *find_mapping_and_check(__address badvaddr); |
47 | static pte_t *find_mapping_and_check(__address badvaddr, istate_t *istate, int *pfrc); |
48 | 48 | ||
49 | static void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, __address pfn); |
49 | static void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, __address pfn); |
50 | static void prepare_entry_hi(entry_hi_t *hi, asid_t asid, __address addr); |
50 | static void prepare_entry_hi(entry_hi_t *hi, asid_t asid, __address addr); |
51 | 51 | ||
52 | /** Initialize TLB |
52 | /** Initialize TLB |
53 | * |
53 | * |
54 | * Initialize TLB. |
54 | * Initialize TLB. |
55 | * Invalidate all entries and mark wired entries. |
55 | * Invalidate all entries and mark wired entries. |
56 | */ |
56 | */ |
57 | void tlb_arch_init(void) |
57 | void tlb_arch_init(void) |
58 | { |
58 | { |
59 | int i; |
59 | int i; |
60 | 60 | ||
61 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
61 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
62 | cp0_entry_hi_write(0); |
62 | cp0_entry_hi_write(0); |
63 | cp0_entry_lo0_write(0); |
63 | cp0_entry_lo0_write(0); |
64 | cp0_entry_lo1_write(0); |
64 | cp0_entry_lo1_write(0); |
65 | 65 | ||
66 | /* Clear and initialize TLB. */ |
66 | /* Clear and initialize TLB. */ |
67 | 67 | ||
68 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
68 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
69 | cp0_index_write(i); |
69 | cp0_index_write(i); |
70 | tlbwi(); |
70 | tlbwi(); |
71 | } |
71 | } |
72 | 72 | ||
73 | 73 | ||
74 | /* |
74 | /* |
75 | * The kernel is going to make use of some wired |
75 | * The kernel is going to make use of some wired |
76 | * entries (e.g. mapping kernel stacks in kseg3). |
76 | * entries (e.g. mapping kernel stacks in kseg3). |
77 | */ |
77 | */ |
78 | cp0_wired_write(TLB_WIRED); |
78 | cp0_wired_write(TLB_WIRED); |
79 | } |
79 | } |
80 | 80 | ||
81 | /** Process TLB Refill Exception |
81 | /** Process TLB Refill Exception |
82 | * |
82 | * |
83 | * Process TLB Refill Exception. |
83 | * Process TLB Refill Exception. |
84 | * |
84 | * |
85 | * @param istate Interrupted register context. |
85 | * @param istate Interrupted register context. |
86 | */ |
86 | */ |
87 | void tlb_refill(istate_t *istate) |
87 | void tlb_refill(istate_t *istate) |
88 | { |
88 | { |
89 | entry_lo_t lo; |
89 | entry_lo_t lo; |
90 | entry_hi_t hi; |
90 | entry_hi_t hi; |
91 | asid_t asid; |
91 | asid_t asid; |
92 | __address badvaddr; |
92 | __address badvaddr; |
93 | pte_t *pte; |
93 | pte_t *pte; |
- | 94 | int pfrc; |
|
94 | 95 | ||
95 | badvaddr = cp0_badvaddr_read(); |
96 | badvaddr = cp0_badvaddr_read(); |
96 | 97 | ||
97 | spinlock_lock(&AS->lock); |
98 | spinlock_lock(&AS->lock); |
98 | asid = AS->asid; |
99 | asid = AS->asid; |
99 | spinlock_unlock(&AS->lock); |
100 | spinlock_unlock(&AS->lock); |
100 | 101 | ||
101 | page_table_lock(AS, true); |
102 | page_table_lock(AS, true); |
102 | 103 | ||
103 | pte = find_mapping_and_check(badvaddr); |
104 | pte = find_mapping_and_check(badvaddr, istate, &pfrc); |
104 | if (!pte) |
105 | if (!pte) { |
- | 106 | switch (pfrc) { |
|
- | 107 | case AS_PF_FAULT: |
|
105 | goto fail; |
108 | goto fail; |
- | 109 | break; |
|
- | 110 | case AS_PF_DEFER: |
|
- | 111 | /* |
|
- | 112 | * The page fault came during copy_from_uspace() |
|
- | 113 | * or copy_to_uspace(). |
|
- | 114 | */ |
|
- | 115 | page_table_unlock(AS, true); |
|
- | 116 | return; |
|
- | 117 | default: |
|
- | 118 | panic("unexpected pfrc (%d)\n", pfrc); |
|
- | 119 | } |
|
- | 120 | } |
|
106 | 121 | ||
107 | /* |
122 | /* |
108 | * Record access to PTE. |
123 | * Record access to PTE. |
109 | */ |
124 | */ |
110 | pte->a = 1; |
125 | pte->a = 1; |
111 | 126 | ||
112 | prepare_entry_hi(&hi, asid, badvaddr); |
127 | prepare_entry_hi(&hi, asid, badvaddr); |
113 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
128 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
114 | 129 | ||
115 | /* |
130 | /* |
116 | * New entry is to be inserted into TLB |
131 | * New entry is to be inserted into TLB |
117 | */ |
132 | */ |
118 | cp0_entry_hi_write(hi.value); |
133 | cp0_entry_hi_write(hi.value); |
119 | if ((badvaddr/PAGE_SIZE) % 2 == 0) { |
134 | if ((badvaddr/PAGE_SIZE) % 2 == 0) { |
120 | cp0_entry_lo0_write(lo.value); |
135 | cp0_entry_lo0_write(lo.value); |
121 | cp0_entry_lo1_write(0); |
136 | cp0_entry_lo1_write(0); |
122 | } |
137 | } |
123 | else { |
138 | else { |
124 | cp0_entry_lo0_write(0); |
139 | cp0_entry_lo0_write(0); |
125 | cp0_entry_lo1_write(lo.value); |
140 | cp0_entry_lo1_write(lo.value); |
126 | } |
141 | } |
127 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
142 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
128 | tlbwr(); |
143 | tlbwr(); |
129 | 144 | ||
130 | page_table_unlock(AS, true); |
145 | page_table_unlock(AS, true); |
131 | return; |
146 | return; |
132 | 147 | ||
133 | fail: |
148 | fail: |
134 | page_table_unlock(AS, true); |
149 | page_table_unlock(AS, true); |
135 | tlb_refill_fail(istate); |
150 | tlb_refill_fail(istate); |
136 | } |
151 | } |
137 | 152 | ||
138 | /** Process TLB Invalid Exception |
153 | /** Process TLB Invalid Exception |
139 | * |
154 | * |
140 | * Process TLB Invalid Exception. |
155 | * Process TLB Invalid Exception. |
141 | * |
156 | * |
142 | * @param istate Interrupted register context. |
157 | * @param istate Interrupted register context. |
143 | */ |
158 | */ |
144 | void tlb_invalid(istate_t *istate) |
159 | void tlb_invalid(istate_t *istate) |
145 | { |
160 | { |
146 | tlb_index_t index; |
161 | tlb_index_t index; |
147 | __address badvaddr; |
162 | __address badvaddr; |
148 | entry_lo_t lo; |
163 | entry_lo_t lo; |
149 | entry_hi_t hi; |
164 | entry_hi_t hi; |
150 | pte_t *pte; |
165 | pte_t *pte; |
- | 166 | int pfrc; |
|
151 | 167 | ||
152 | badvaddr = cp0_badvaddr_read(); |
168 | badvaddr = cp0_badvaddr_read(); |
153 | 169 | ||
154 | /* |
170 | /* |
155 | * Locate the faulting entry in TLB. |
171 | * Locate the faulting entry in TLB. |
156 | */ |
172 | */ |
157 | hi.value = cp0_entry_hi_read(); |
173 | hi.value = cp0_entry_hi_read(); |
158 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
174 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
159 | cp0_entry_hi_write(hi.value); |
175 | cp0_entry_hi_write(hi.value); |
160 | tlbp(); |
176 | tlbp(); |
161 | index.value = cp0_index_read(); |
177 | index.value = cp0_index_read(); |
162 | 178 | ||
163 | page_table_lock(AS, true); |
179 | page_table_lock(AS, true); |
164 | 180 | ||
165 | /* |
181 | /* |
166 | * Fail if the entry is not in TLB. |
182 | * Fail if the entry is not in TLB. |
167 | */ |
183 | */ |
168 | if (index.p) { |
184 | if (index.p) { |
169 | printf("TLB entry not found.\n"); |
185 | printf("TLB entry not found.\n"); |
170 | goto fail; |
186 | goto fail; |
171 | } |
187 | } |
172 | 188 | ||
173 | pte = find_mapping_and_check(badvaddr); |
189 | pte = find_mapping_and_check(badvaddr, istate, &pfrc); |
174 | if (!pte) |
190 | if (!pte) { |
- | 191 | switch (pfrc) { |
|
- | 192 | case AS_PF_FAULT: |
|
175 | goto fail; |
193 | goto fail; |
- | 194 | break; |
|
- | 195 | case AS_PF_DEFER: |
|
- | 196 | /* |
|
- | 197 | * The page fault came during copy_from_uspace() |
|
- | 198 | * or copy_to_uspace(). |
|
- | 199 | */ |
|
- | 200 | page_table_unlock(AS, true); |
|
- | 201 | return; |
|
- | 202 | default: |
|
- | 203 | panic("unexpected pfrc (%d)\n", pfrc); |
|
- | 204 | } |
|
- | 205 | } |
|
176 | 206 | ||
177 | /* |
207 | /* |
178 | * Read the faulting TLB entry. |
208 | * Read the faulting TLB entry. |
179 | */ |
209 | */ |
180 | tlbr(); |
210 | tlbr(); |
181 | 211 | ||
182 | /* |
212 | /* |
183 | * Record access to PTE. |
213 | * Record access to PTE. |
184 | */ |
214 | */ |
185 | pte->a = 1; |
215 | pte->a = 1; |
186 | 216 | ||
187 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
217 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
188 | 218 | ||
189 | /* |
219 | /* |
190 | * The entry is to be updated in TLB. |
220 | * The entry is to be updated in TLB. |
191 | */ |
221 | */ |
192 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
222 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
193 | cp0_entry_lo0_write(lo.value); |
223 | cp0_entry_lo0_write(lo.value); |
194 | else |
224 | else |
195 | cp0_entry_lo1_write(lo.value); |
225 | cp0_entry_lo1_write(lo.value); |
196 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
226 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
197 | tlbwi(); |
227 | tlbwi(); |
198 | 228 | ||
199 | page_table_unlock(AS, true); |
229 | page_table_unlock(AS, true); |
200 | return; |
230 | return; |
201 | 231 | ||
202 | fail: |
232 | fail: |
203 | page_table_unlock(AS, true); |
233 | page_table_unlock(AS, true); |
204 | tlb_invalid_fail(istate); |
234 | tlb_invalid_fail(istate); |
205 | } |
235 | } |
206 | 236 | ||
207 | /** Process TLB Modified Exception |
237 | /** Process TLB Modified Exception |
208 | * |
238 | * |
209 | * Process TLB Modified Exception. |
239 | * Process TLB Modified Exception. |
210 | * |
240 | * |
211 | * @param istate Interrupted register context. |
241 | * @param istate Interrupted register context. |
212 | */ |
242 | */ |
213 | void tlb_modified(istate_t *istate) |
243 | void tlb_modified(istate_t *istate) |
214 | { |
244 | { |
215 | tlb_index_t index; |
245 | tlb_index_t index; |
216 | __address badvaddr; |
246 | __address badvaddr; |
217 | entry_lo_t lo; |
247 | entry_lo_t lo; |
218 | entry_hi_t hi; |
248 | entry_hi_t hi; |
219 | pte_t *pte; |
249 | pte_t *pte; |
- | 250 | int pfrc; |
|
220 | 251 | ||
221 | badvaddr = cp0_badvaddr_read(); |
252 | badvaddr = cp0_badvaddr_read(); |
222 | 253 | ||
223 | /* |
254 | /* |
224 | * Locate the faulting entry in TLB. |
255 | * Locate the faulting entry in TLB. |
225 | */ |
256 | */ |
226 | hi.value = cp0_entry_hi_read(); |
257 | hi.value = cp0_entry_hi_read(); |
227 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
258 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
228 | cp0_entry_hi_write(hi.value); |
259 | cp0_entry_hi_write(hi.value); |
229 | tlbp(); |
260 | tlbp(); |
230 | index.value = cp0_index_read(); |
261 | index.value = cp0_index_read(); |
231 | 262 | ||
232 | page_table_lock(AS, true); |
263 | page_table_lock(AS, true); |
233 | 264 | ||
234 | /* |
265 | /* |
235 | * Fail if the entry is not in TLB. |
266 | * Fail if the entry is not in TLB. |
236 | */ |
267 | */ |
237 | if (index.p) { |
268 | if (index.p) { |
238 | printf("TLB entry not found.\n"); |
269 | printf("TLB entry not found.\n"); |
239 | goto fail; |
270 | goto fail; |
240 | } |
271 | } |
241 | 272 | ||
242 | pte = find_mapping_and_check(badvaddr); |
273 | pte = find_mapping_and_check(badvaddr, istate, &pfrc); |
243 | if (!pte) |
274 | if (!pte) { |
- | 275 | switch (pfrc) { |
|
- | 276 | case AS_PF_FAULT: |
|
244 | goto fail; |
277 | goto fail; |
- | 278 | break; |
|
- | 279 | case AS_PF_DEFER: |
|
- | 280 | /* |
|
- | 281 | * The page fault came during copy_from_uspace() |
|
- | 282 | * or copy_to_uspace(). |
|
- | 283 | */ |
|
- | 284 | page_table_unlock(AS, true); |
|
- | 285 | return; |
|
- | 286 | default: |
|
- | 287 | panic("unexpected pfrc (%d)\n", pfrc); |
|
- | 288 | } |
|
- | 289 | } |
|
245 | 290 | ||
246 | /* |
291 | /* |
247 | * Fail if the page is not writable. |
292 | * Fail if the page is not writable. |
248 | */ |
293 | */ |
249 | if (!pte->w) |
294 | if (!pte->w) |
250 | goto fail; |
295 | goto fail; |
251 | 296 | ||
252 | /* |
297 | /* |
253 | * Read the faulting TLB entry. |
298 | * Read the faulting TLB entry. |
254 | */ |
299 | */ |
255 | tlbr(); |
300 | tlbr(); |
256 | 301 | ||
257 | /* |
302 | /* |
258 | * Record access and write to PTE. |
303 | * Record access and write to PTE. |
259 | */ |
304 | */ |
260 | pte->a = 1; |
305 | pte->a = 1; |
261 | pte->d = 1; |
306 | pte->d = 1; |
262 | 307 | ||
263 | prepare_entry_lo(&lo, pte->g, pte->p, pte->w, pte->cacheable, pte->pfn); |
308 | prepare_entry_lo(&lo, pte->g, pte->p, pte->w, pte->cacheable, pte->pfn); |
264 | 309 | ||
265 | /* |
310 | /* |
266 | * The entry is to be updated in TLB. |
311 | * The entry is to be updated in TLB. |
267 | */ |
312 | */ |
268 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
313 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
269 | cp0_entry_lo0_write(lo.value); |
314 | cp0_entry_lo0_write(lo.value); |
270 | else |
315 | else |
271 | cp0_entry_lo1_write(lo.value); |
316 | cp0_entry_lo1_write(lo.value); |
272 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
317 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
273 | tlbwi(); |
318 | tlbwi(); |
274 | 319 | ||
275 | page_table_unlock(AS, true); |
320 | page_table_unlock(AS, true); |
276 | return; |
321 | return; |
277 | 322 | ||
278 | fail: |
323 | fail: |
279 | page_table_unlock(AS, true); |
324 | page_table_unlock(AS, true); |
280 | tlb_modified_fail(istate); |
325 | tlb_modified_fail(istate); |
281 | } |
326 | } |
282 | 327 | ||
283 | void tlb_refill_fail(istate_t *istate) |
328 | void tlb_refill_fail(istate_t *istate) |
284 | { |
329 | { |
285 | char *symbol = ""; |
330 | char *symbol = ""; |
286 | char *sym2 = ""; |
331 | char *sym2 = ""; |
287 | 332 | ||
288 | char *s = get_symtab_entry(istate->epc); |
333 | char *s = get_symtab_entry(istate->epc); |
289 | if (s) |
334 | if (s) |
290 | symbol = s; |
335 | symbol = s; |
291 | s = get_symtab_entry(istate->ra); |
336 | s = get_symtab_entry(istate->ra); |
292 | if (s) |
337 | if (s) |
293 | sym2 = s; |
338 | sym2 = s; |
294 | panic("%X: TLB Refill Exception at %X(%s<-%s)\n", cp0_badvaddr_read(), istate->epc, symbol, sym2); |
339 | panic("%X: TLB Refill Exception at %X(%s<-%s)\n", cp0_badvaddr_read(), istate->epc, symbol, sym2); |
295 | } |
340 | } |
296 | 341 | ||
297 | 342 | ||
298 | void tlb_invalid_fail(istate_t *istate) |
343 | void tlb_invalid_fail(istate_t *istate) |
299 | { |
344 | { |
300 | char *symbol = ""; |
345 | char *symbol = ""; |
301 | 346 | ||
302 | char *s = get_symtab_entry(istate->epc); |
347 | char *s = get_symtab_entry(istate->epc); |
303 | if (s) |
348 | if (s) |
304 | symbol = s; |
349 | symbol = s; |
305 | panic("%X: TLB Invalid Exception at %X(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
350 | panic("%X: TLB Invalid Exception at %X(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
306 | } |
351 | } |
307 | 352 | ||
308 | void tlb_modified_fail(istate_t *istate) |
353 | void tlb_modified_fail(istate_t *istate) |
309 | { |
354 | { |
310 | char *symbol = ""; |
355 | char *symbol = ""; |
311 | 356 | ||
312 | char *s = get_symtab_entry(istate->epc); |
357 | char *s = get_symtab_entry(istate->epc); |
313 | if (s) |
358 | if (s) |
314 | symbol = s; |
359 | symbol = s; |
315 | panic("%X: TLB Modified Exception at %X(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
360 | panic("%X: TLB Modified Exception at %X(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
316 | } |
361 | } |
317 | 362 | ||
318 | /** Try to find PTE for faulting address |
363 | /** Try to find PTE for faulting address |
319 | * |
364 | * |
320 | * Try to find PTE for faulting address. |
365 | * Try to find PTE for faulting address. |
321 | * The AS->lock must be held on entry to this function. |
366 | * The AS->lock must be held on entry to this function. |
322 | * |
367 | * |
323 | * @param badvaddr Faulting virtual address. |
368 | * @param badvaddr Faulting virtual address. |
- | 369 | * @param istate Pointer to interrupted state. |
|
- | 370 | * @param pfrc Pointer to variable where as_page_fault() return code will be stored. |
|
324 | * |
371 | * |
325 | * @return PTE on success, NULL otherwise. |
372 | * @return PTE on success, NULL otherwise. |
326 | */ |
373 | */ |
327 | pte_t *find_mapping_and_check(__address badvaddr) |
374 | pte_t *find_mapping_and_check(__address badvaddr, istate_t *istate, int *pfrc) |
328 | { |
375 | { |
329 | entry_hi_t hi; |
376 | entry_hi_t hi; |
330 | pte_t *pte; |
377 | pte_t *pte; |
331 | 378 | ||
332 | hi.value = cp0_entry_hi_read(); |
379 | hi.value = cp0_entry_hi_read(); |
333 | 380 | ||
334 | /* |
381 | /* |
335 | * Handler cannot succeed if the ASIDs don't match. |
382 | * Handler cannot succeed if the ASIDs don't match. |
336 | */ |
383 | */ |
337 | if (hi.asid != AS->asid) { |
384 | if (hi.asid != AS->asid) { |
338 | printf("EntryHi.asid=%d, AS->asid=%d\n", hi.asid, AS->asid); |
385 | printf("EntryHi.asid=%d, AS->asid=%d\n", hi.asid, AS->asid); |
339 | return NULL; |
386 | return NULL; |
340 | } |
387 | } |
341 | 388 | ||
342 | /* |
389 | /* |
343 | * Check if the mapping exists in page tables. |
390 | * Check if the mapping exists in page tables. |
344 | */ |
391 | */ |
345 | pte = page_mapping_find(AS, badvaddr); |
392 | pte = page_mapping_find(AS, badvaddr); |
346 | if (pte && pte->p) { |
393 | if (pte && pte->p) { |
347 | /* |
394 | /* |
348 | * Mapping found in page tables. |
395 | * Mapping found in page tables. |
349 | * Immediately succeed. |
396 | * Immediately succeed. |
350 | */ |
397 | */ |
351 | return pte; |
398 | return pte; |
352 | } else { |
399 | } else { |
- | 400 | int rc; |
|
- | 401 | ||
353 | /* |
402 | /* |
354 | * Mapping not found in page tables. |
403 | * Mapping not found in page tables. |
355 | * Resort to higher-level page fault handler. |
404 | * Resort to higher-level page fault handler. |
356 | */ |
405 | */ |
357 | page_table_unlock(AS, true); |
406 | page_table_unlock(AS, true); |
358 | if (as_page_fault(badvaddr)) { |
407 | switch (rc = as_page_fault(badvaddr, istate)) { |
- | 408 | case AS_PF_OK: |
|
359 | /* |
409 | /* |
360 | * The higher-level page fault handler succeeded, |
410 | * The higher-level page fault handler succeeded, |
361 | * The mapping ought to be in place. |
411 | * The mapping ought to be in place. |
362 | */ |
412 | */ |
363 | page_table_lock(AS, true); |
413 | page_table_lock(AS, true); |
364 | pte = page_mapping_find(AS, badvaddr); |
414 | pte = page_mapping_find(AS, badvaddr); |
365 | ASSERT(pte && pte->p); |
415 | ASSERT(pte && pte->p); |
366 | return pte; |
416 | return pte; |
- | 417 | break; |
|
- | 418 | case AS_PF_DEFER: |
|
- | 419 | page_table_lock(AS, true); |
|
- | 420 | *pfrc = AS_PF_DEFER; |
|
- | 421 | return NULL; |
|
367 | } else { |
422 | break; |
- | 423 | case AS_PF_FAULT: |
|
368 | page_table_lock(AS, true); |
424 | page_table_lock(AS, true); |
369 | printf("Page fault.\n"); |
425 | printf("Page fault.\n"); |
- | 426 | *pfrc = AS_PF_FAULT; |
|
370 | return NULL; |
427 | return NULL; |
- | 428 | break; |
|
- | 429 | default: |
|
- | 430 | panic("unexpected rc (%d)\n", rc); |
|
371 | } |
431 | } |
372 | 432 | ||
373 | } |
433 | } |
374 | } |
434 | } |
375 | 435 | ||
376 | void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, __address pfn) |
436 | void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, __address pfn) |
377 | { |
437 | { |
378 | lo->value = 0; |
438 | lo->value = 0; |
379 | lo->g = g; |
439 | lo->g = g; |
380 | lo->v = v; |
440 | lo->v = v; |
381 | lo->d = d; |
441 | lo->d = d; |
382 | lo->c = cacheable ? PAGE_CACHEABLE_EXC_WRITE : PAGE_UNCACHED; |
442 | lo->c = cacheable ? PAGE_CACHEABLE_EXC_WRITE : PAGE_UNCACHED; |
383 | lo->pfn = pfn; |
443 | lo->pfn = pfn; |
384 | } |
444 | } |
385 | 445 | ||
386 | void prepare_entry_hi(entry_hi_t *hi, asid_t asid, __address addr) |
446 | void prepare_entry_hi(entry_hi_t *hi, asid_t asid, __address addr) |
387 | { |
447 | { |
388 | hi->value = ALIGN_DOWN(addr, PAGE_SIZE * 2); |
448 | hi->value = ALIGN_DOWN(addr, PAGE_SIZE * 2); |
389 | hi->asid = asid; |
449 | hi->asid = asid; |
390 | } |
450 | } |
391 | 451 | ||
392 | /** Print contents of TLB. */ |
452 | /** Print contents of TLB. */ |
393 | void tlb_print(void) |
453 | void tlb_print(void) |
394 | { |
454 | { |
395 | page_mask_t mask; |
455 | page_mask_t mask; |
396 | entry_lo_t lo0, lo1; |
456 | entry_lo_t lo0, lo1; |
397 | entry_hi_t hi, hi_save; |
457 | entry_hi_t hi, hi_save; |
398 | int i; |
458 | int i; |
399 | 459 | ||
400 | hi_save.value = cp0_entry_hi_read(); |
460 | hi_save.value = cp0_entry_hi_read(); |
401 | 461 | ||
402 | printf("TLB:\n"); |
462 | printf("TLB:\n"); |
403 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
463 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
404 | cp0_index_write(i); |
464 | cp0_index_write(i); |
405 | tlbr(); |
465 | tlbr(); |
406 | 466 | ||
407 | mask.value = cp0_pagemask_read(); |
467 | mask.value = cp0_pagemask_read(); |
408 | hi.value = cp0_entry_hi_read(); |
468 | hi.value = cp0_entry_hi_read(); |
409 | lo0.value = cp0_entry_lo0_read(); |
469 | lo0.value = cp0_entry_lo0_read(); |
410 | lo1.value = cp0_entry_lo1_read(); |
470 | lo1.value = cp0_entry_lo1_read(); |
411 | 471 | ||
412 | printf("%d: asid=%d, vpn2=%d, mask=%d\tg[0]=%d, v[0]=%d, d[0]=%d, c[0]=%hhd, pfn[0]=%d\n" |
472 | printf("%d: asid=%d, vpn2=%d, mask=%d\tg[0]=%d, v[0]=%d, d[0]=%d, c[0]=%hhd, pfn[0]=%d\n" |
413 | "\t\t\t\tg[1]=%d, v[1]=%d, d[1]=%d, c[1]=%hhd, pfn[1]=%d\n", |
473 | "\t\t\t\tg[1]=%d, v[1]=%d, d[1]=%d, c[1]=%hhd, pfn[1]=%d\n", |
414 | i, hi.asid, hi.vpn2, mask.mask, lo0.g, lo0.v, lo0.d, lo0.c, lo0.pfn, |
474 | i, hi.asid, hi.vpn2, mask.mask, lo0.g, lo0.v, lo0.d, lo0.c, lo0.pfn, |
415 | lo1.g, lo1.v, lo1.d, lo1.c, lo1.pfn); |
475 | lo1.g, lo1.v, lo1.d, lo1.c, lo1.pfn); |
416 | } |
476 | } |
417 | 477 | ||
418 | cp0_entry_hi_write(hi_save.value); |
478 | cp0_entry_hi_write(hi_save.value); |
419 | } |
479 | } |
420 | 480 | ||
421 | /** Invalidate all not wired TLB entries. */ |
481 | /** Invalidate all not wired TLB entries. */ |
422 | void tlb_invalidate_all(void) |
482 | void tlb_invalidate_all(void) |
423 | { |
483 | { |
424 | ipl_t ipl; |
484 | ipl_t ipl; |
425 | entry_lo_t lo0, lo1; |
485 | entry_lo_t lo0, lo1; |
426 | entry_hi_t hi_save; |
486 | entry_hi_t hi_save; |
427 | int i; |
487 | int i; |
428 | 488 | ||
429 | hi_save.value = cp0_entry_hi_read(); |
489 | hi_save.value = cp0_entry_hi_read(); |
430 | ipl = interrupts_disable(); |
490 | ipl = interrupts_disable(); |
431 | 491 | ||
432 | for (i = TLB_WIRED; i < TLB_ENTRY_COUNT; i++) { |
492 | for (i = TLB_WIRED; i < TLB_ENTRY_COUNT; i++) { |
433 | cp0_index_write(i); |
493 | cp0_index_write(i); |
434 | tlbr(); |
494 | tlbr(); |
435 | 495 | ||
436 | lo0.value = cp0_entry_lo0_read(); |
496 | lo0.value = cp0_entry_lo0_read(); |
437 | lo1.value = cp0_entry_lo1_read(); |
497 | lo1.value = cp0_entry_lo1_read(); |
438 | 498 | ||
439 | lo0.v = 0; |
499 | lo0.v = 0; |
440 | lo1.v = 0; |
500 | lo1.v = 0; |
441 | 501 | ||
442 | cp0_entry_lo0_write(lo0.value); |
502 | cp0_entry_lo0_write(lo0.value); |
443 | cp0_entry_lo1_write(lo1.value); |
503 | cp0_entry_lo1_write(lo1.value); |
444 | 504 | ||
445 | tlbwi(); |
505 | tlbwi(); |
446 | } |
506 | } |
447 | 507 | ||
448 | interrupts_restore(ipl); |
508 | interrupts_restore(ipl); |
449 | cp0_entry_hi_write(hi_save.value); |
509 | cp0_entry_hi_write(hi_save.value); |
450 | } |
510 | } |
451 | 511 | ||
452 | /** Invalidate all TLB entries belonging to specified address space. |
512 | /** Invalidate all TLB entries belonging to specified address space. |
453 | * |
513 | * |
454 | * @param asid Address space identifier. |
514 | * @param asid Address space identifier. |
455 | */ |
515 | */ |
456 | void tlb_invalidate_asid(asid_t asid) |
516 | void tlb_invalidate_asid(asid_t asid) |
457 | { |
517 | { |
458 | ipl_t ipl; |
518 | ipl_t ipl; |
459 | entry_lo_t lo0, lo1; |
519 | entry_lo_t lo0, lo1; |
460 | entry_hi_t hi, hi_save; |
520 | entry_hi_t hi, hi_save; |
461 | int i; |
521 | int i; |
462 | 522 | ||
463 | ASSERT(asid != ASID_INVALID); |
523 | ASSERT(asid != ASID_INVALID); |
464 | 524 | ||
465 | hi_save.value = cp0_entry_hi_read(); |
525 | hi_save.value = cp0_entry_hi_read(); |
466 | ipl = interrupts_disable(); |
526 | ipl = interrupts_disable(); |
467 | 527 | ||
468 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
528 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
469 | cp0_index_write(i); |
529 | cp0_index_write(i); |
470 | tlbr(); |
530 | tlbr(); |
471 | 531 | ||
472 | hi.value = cp0_entry_hi_read(); |
532 | hi.value = cp0_entry_hi_read(); |
473 | 533 | ||
474 | if (hi.asid == asid) { |
534 | if (hi.asid == asid) { |
475 | lo0.value = cp0_entry_lo0_read(); |
535 | lo0.value = cp0_entry_lo0_read(); |
476 | lo1.value = cp0_entry_lo1_read(); |
536 | lo1.value = cp0_entry_lo1_read(); |
477 | 537 | ||
478 | lo0.v = 0; |
538 | lo0.v = 0; |
479 | lo1.v = 0; |
539 | lo1.v = 0; |
480 | 540 | ||
481 | cp0_entry_lo0_write(lo0.value); |
541 | cp0_entry_lo0_write(lo0.value); |
482 | cp0_entry_lo1_write(lo1.value); |
542 | cp0_entry_lo1_write(lo1.value); |
483 | 543 | ||
484 | tlbwi(); |
544 | tlbwi(); |
485 | } |
545 | } |
486 | } |
546 | } |
487 | 547 | ||
488 | interrupts_restore(ipl); |
548 | interrupts_restore(ipl); |
489 | cp0_entry_hi_write(hi_save.value); |
549 | cp0_entry_hi_write(hi_save.value); |
490 | } |
550 | } |
491 | 551 | ||
492 | /** Invalidate TLB entries for specified page range belonging to specified address space. |
552 | /** Invalidate TLB entries for specified page range belonging to specified address space. |
493 | * |
553 | * |
494 | * @param asid Address space identifier. |
554 | * @param asid Address space identifier. |
495 | * @param page First page whose TLB entry is to be invalidated. |
555 | * @param page First page whose TLB entry is to be invalidated. |
496 | * @param cnt Number of entries to invalidate. |
556 | * @param cnt Number of entries to invalidate. |
497 | */ |
557 | */ |
498 | void tlb_invalidate_pages(asid_t asid, __address page, count_t cnt) |
558 | void tlb_invalidate_pages(asid_t asid, __address page, count_t cnt) |
499 | { |
559 | { |
500 | int i; |
560 | int i; |
501 | ipl_t ipl; |
561 | ipl_t ipl; |
502 | entry_lo_t lo0, lo1; |
562 | entry_lo_t lo0, lo1; |
503 | entry_hi_t hi, hi_save; |
563 | entry_hi_t hi, hi_save; |
504 | tlb_index_t index; |
564 | tlb_index_t index; |
505 | 565 | ||
506 | ASSERT(asid != ASID_INVALID); |
566 | ASSERT(asid != ASID_INVALID); |
507 | 567 | ||
508 | hi_save.value = cp0_entry_hi_read(); |
568 | hi_save.value = cp0_entry_hi_read(); |
509 | ipl = interrupts_disable(); |
569 | ipl = interrupts_disable(); |
510 | 570 | ||
511 | for (i = 0; i < cnt+1; i+=2) { |
571 | for (i = 0; i < cnt+1; i+=2) { |
512 | hi.value = 0; |
572 | hi.value = 0; |
513 | prepare_entry_hi(&hi, asid, page + i * PAGE_SIZE); |
573 | prepare_entry_hi(&hi, asid, page + i * PAGE_SIZE); |
514 | cp0_entry_hi_write(hi.value); |
574 | cp0_entry_hi_write(hi.value); |
515 | 575 | ||
516 | tlbp(); |
576 | tlbp(); |
517 | index.value = cp0_index_read(); |
577 | index.value = cp0_index_read(); |
518 | 578 | ||
519 | if (!index.p) { |
579 | if (!index.p) { |
520 | /* Entry was found, index register contains valid index. */ |
580 | /* Entry was found, index register contains valid index. */ |
521 | tlbr(); |
581 | tlbr(); |
522 | 582 | ||
523 | lo0.value = cp0_entry_lo0_read(); |
583 | lo0.value = cp0_entry_lo0_read(); |
524 | lo1.value = cp0_entry_lo1_read(); |
584 | lo1.value = cp0_entry_lo1_read(); |
525 | 585 | ||
526 | lo0.v = 0; |
586 | lo0.v = 0; |
527 | lo1.v = 0; |
587 | lo1.v = 0; |
528 | 588 | ||
529 | cp0_entry_lo0_write(lo0.value); |
589 | cp0_entry_lo0_write(lo0.value); |
530 | cp0_entry_lo1_write(lo1.value); |
590 | cp0_entry_lo1_write(lo1.value); |
531 | 591 | ||
532 | tlbwi(); |
592 | tlbwi(); |
533 | } |
593 | } |
534 | } |
594 | } |
535 | 595 | ||
536 | interrupts_restore(ipl); |
596 | interrupts_restore(ipl); |
537 | cp0_entry_hi_write(hi_save.value); |
597 | cp0_entry_hi_write(hi_save.value); |
538 | } |
598 | } |
539 | 599 |