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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 | /** @addtogroup mips32mm |
29 | /** @addtogroup mips32mm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <arch/mm/tlb.h> |
35 | #include <arch/mm/tlb.h> |
36 | #include <mm/asid.h> |
36 | #include <mm/asid.h> |
37 | #include <mm/tlb.h> |
37 | #include <mm/tlb.h> |
38 | #include <mm/page.h> |
38 | #include <mm/page.h> |
39 | #include <mm/as.h> |
39 | #include <mm/as.h> |
40 | #include <arch/cp0.h> |
40 | #include <arch/cp0.h> |
41 | #include <panic.h> |
41 | #include <panic.h> |
42 | #include <arch.h> |
42 | #include <arch.h> |
43 | #include <symtab.h> |
43 | #include <symtab.h> |
44 | #include <synch/spinlock.h> |
44 | #include <synch/spinlock.h> |
45 | #include <print.h> |
45 | #include <print.h> |
46 | #include <debug.h> |
46 | #include <debug.h> |
47 | #include <align.h> |
47 | #include <align.h> |
48 | #include <interrupt.h> |
48 | #include <interrupt.h> |
49 | 49 | ||
50 | static void tlb_refill_fail(istate_t *istate); |
50 | static void tlb_refill_fail(istate_t *istate); |
51 | static void tlb_invalid_fail(istate_t *istate); |
51 | static void tlb_invalid_fail(istate_t *istate); |
52 | static void tlb_modified_fail(istate_t *istate); |
52 | static void tlb_modified_fail(istate_t *istate); |
53 | 53 | ||
54 | static pte_t *find_mapping_and_check(uintptr_t badvaddr, int access, istate_t *istate, int *pfrc); |
54 | static pte_t *find_mapping_and_check(uintptr_t badvaddr, int access, istate_t *istate, int *pfrc); |
55 | 55 | ||
56 | static void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn); |
56 | static void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn); |
57 | static void prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr); |
57 | static void prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr); |
58 | 58 | ||
59 | /** Initialize TLB |
59 | /** Initialize TLB |
60 | * |
60 | * |
61 | * Initialize TLB. |
61 | * Initialize TLB. |
62 | * Invalidate all entries and mark wired entries. |
62 | * Invalidate all entries and mark wired entries. |
63 | */ |
63 | */ |
64 | void tlb_arch_init(void) |
64 | void tlb_arch_init(void) |
65 | { |
65 | { |
66 | int i; |
66 | int i; |
67 | 67 | ||
68 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
68 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
69 | cp0_entry_hi_write(0); |
69 | cp0_entry_hi_write(0); |
70 | cp0_entry_lo0_write(0); |
70 | cp0_entry_lo0_write(0); |
71 | cp0_entry_lo1_write(0); |
71 | cp0_entry_lo1_write(0); |
72 | 72 | ||
73 | /* Clear and initialize TLB. */ |
73 | /* Clear and initialize TLB. */ |
74 | 74 | ||
75 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
75 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
76 | cp0_index_write(i); |
76 | cp0_index_write(i); |
77 | tlbwi(); |
77 | tlbwi(); |
78 | } |
78 | } |
79 | 79 | ||
80 | 80 | ||
81 | /* |
81 | /* |
82 | * The kernel is going to make use of some wired |
82 | * The kernel is going to make use of some wired |
83 | * entries (e.g. mapping kernel stacks in kseg3). |
83 | * entries (e.g. mapping kernel stacks in kseg3). |
84 | */ |
84 | */ |
85 | cp0_wired_write(TLB_WIRED); |
85 | cp0_wired_write(TLB_WIRED); |
86 | } |
86 | } |
87 | 87 | ||
88 | /** Process TLB Refill Exception |
88 | /** Process TLB Refill Exception |
89 | * |
89 | * |
90 | * Process TLB Refill Exception. |
90 | * Process TLB Refill Exception. |
91 | * |
91 | * |
92 | * @param istate Interrupted register context. |
92 | * @param istate Interrupted register context. |
93 | */ |
93 | */ |
94 | void tlb_refill(istate_t *istate) |
94 | void tlb_refill(istate_t *istate) |
95 | { |
95 | { |
96 | entry_lo_t lo; |
96 | entry_lo_t lo; |
97 | entry_hi_t hi; |
97 | entry_hi_t hi; |
98 | asid_t asid; |
98 | asid_t asid; |
99 | uintptr_t badvaddr; |
99 | uintptr_t badvaddr; |
100 | pte_t *pte; |
100 | pte_t *pte; |
101 | int pfrc; |
101 | int pfrc; |
102 | 102 | ||
103 | badvaddr = cp0_badvaddr_read(); |
103 | badvaddr = cp0_badvaddr_read(); |
104 | 104 | ||
105 | spinlock_lock(&AS->lock); |
105 | spinlock_lock(&AS->lock); |
106 | asid = AS->asid; |
106 | asid = AS->asid; |
107 | spinlock_unlock(&AS->lock); |
107 | spinlock_unlock(&AS->lock); |
108 | 108 | ||
109 | page_table_lock(AS, true); |
109 | page_table_lock(AS, true); |
110 | 110 | ||
111 | pte = find_mapping_and_check(badvaddr, PF_ACCESS_READ, istate, &pfrc); |
111 | pte = find_mapping_and_check(badvaddr, PF_ACCESS_READ, istate, &pfrc); |
112 | if (!pte) { |
112 | if (!pte) { |
113 | switch (pfrc) { |
113 | switch (pfrc) { |
114 | case AS_PF_FAULT: |
114 | case AS_PF_FAULT: |
115 | goto fail; |
115 | goto fail; |
116 | break; |
116 | break; |
117 | case AS_PF_DEFER: |
117 | case AS_PF_DEFER: |
118 | /* |
118 | /* |
119 | * The page fault came during copy_from_uspace() |
119 | * The page fault came during copy_from_uspace() |
120 | * or copy_to_uspace(). |
120 | * or copy_to_uspace(). |
121 | */ |
121 | */ |
122 | page_table_unlock(AS, true); |
122 | page_table_unlock(AS, true); |
123 | return; |
123 | return; |
124 | default: |
124 | default: |
125 | panic("unexpected pfrc (%d)\n", pfrc); |
125 | panic("unexpected pfrc (%d)\n", pfrc); |
126 | } |
126 | } |
127 | } |
127 | } |
128 | 128 | ||
129 | /* |
129 | /* |
130 | * Record access to PTE. |
130 | * Record access to PTE. |
131 | */ |
131 | */ |
132 | pte->a = 1; |
132 | pte->a = 1; |
133 | 133 | ||
134 | prepare_entry_hi(&hi, asid, badvaddr); |
134 | prepare_entry_hi(&hi, asid, badvaddr); |
135 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
135 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
136 | 136 | ||
137 | /* |
137 | /* |
138 | * New entry is to be inserted into TLB |
138 | * New entry is to be inserted into TLB |
139 | */ |
139 | */ |
140 | cp0_entry_hi_write(hi.value); |
140 | cp0_entry_hi_write(hi.value); |
141 | if ((badvaddr/PAGE_SIZE) % 2 == 0) { |
141 | if ((badvaddr/PAGE_SIZE) % 2 == 0) { |
142 | cp0_entry_lo0_write(lo.value); |
142 | cp0_entry_lo0_write(lo.value); |
143 | cp0_entry_lo1_write(0); |
143 | cp0_entry_lo1_write(0); |
144 | } |
144 | } |
145 | else { |
145 | else { |
146 | cp0_entry_lo0_write(0); |
146 | cp0_entry_lo0_write(0); |
147 | cp0_entry_lo1_write(lo.value); |
147 | cp0_entry_lo1_write(lo.value); |
148 | } |
148 | } |
149 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
149 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
150 | tlbwr(); |
150 | tlbwr(); |
151 | 151 | ||
152 | page_table_unlock(AS, true); |
152 | page_table_unlock(AS, true); |
153 | return; |
153 | return; |
154 | 154 | ||
155 | fail: |
155 | fail: |
156 | page_table_unlock(AS, true); |
156 | page_table_unlock(AS, true); |
157 | tlb_refill_fail(istate); |
157 | tlb_refill_fail(istate); |
158 | } |
158 | } |
159 | 159 | ||
160 | /** Process TLB Invalid Exception |
160 | /** Process TLB Invalid Exception |
161 | * |
161 | * |
162 | * Process TLB Invalid Exception. |
162 | * Process TLB Invalid Exception. |
163 | * |
163 | * |
164 | * @param istate Interrupted register context. |
164 | * @param istate Interrupted register context. |
165 | */ |
165 | */ |
166 | void tlb_invalid(istate_t *istate) |
166 | void tlb_invalid(istate_t *istate) |
167 | { |
167 | { |
168 | tlb_index_t index; |
168 | tlb_index_t index; |
169 | uintptr_t badvaddr; |
169 | uintptr_t badvaddr; |
170 | entry_lo_t lo; |
170 | entry_lo_t lo; |
171 | entry_hi_t hi; |
171 | entry_hi_t hi; |
172 | pte_t *pte; |
172 | pte_t *pte; |
173 | int pfrc; |
173 | int pfrc; |
174 | 174 | ||
175 | badvaddr = cp0_badvaddr_read(); |
175 | badvaddr = cp0_badvaddr_read(); |
176 | 176 | ||
177 | /* |
177 | /* |
178 | * Locate the faulting entry in TLB. |
178 | * Locate the faulting entry in TLB. |
179 | */ |
179 | */ |
180 | hi.value = cp0_entry_hi_read(); |
180 | hi.value = cp0_entry_hi_read(); |
181 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
181 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
182 | cp0_entry_hi_write(hi.value); |
182 | cp0_entry_hi_write(hi.value); |
183 | tlbp(); |
183 | tlbp(); |
184 | index.value = cp0_index_read(); |
184 | index.value = cp0_index_read(); |
185 | 185 | ||
186 | page_table_lock(AS, true); |
186 | page_table_lock(AS, true); |
187 | 187 | ||
188 | /* |
188 | /* |
189 | * Fail if the entry is not in TLB. |
189 | * Fail if the entry is not in TLB. |
190 | */ |
190 | */ |
191 | if (index.p) { |
191 | if (index.p) { |
192 | printf("TLB entry not found.\n"); |
192 | printf("TLB entry not found.\n"); |
193 | goto fail; |
193 | goto fail; |
194 | } |
194 | } |
195 | 195 | ||
196 | pte = find_mapping_and_check(badvaddr, PF_ACCESS_READ, istate, &pfrc); |
196 | pte = find_mapping_and_check(badvaddr, PF_ACCESS_READ, istate, &pfrc); |
197 | if (!pte) { |
197 | if (!pte) { |
198 | switch (pfrc) { |
198 | switch (pfrc) { |
199 | case AS_PF_FAULT: |
199 | case AS_PF_FAULT: |
200 | goto fail; |
200 | goto fail; |
201 | break; |
201 | break; |
202 | case AS_PF_DEFER: |
202 | case AS_PF_DEFER: |
203 | /* |
203 | /* |
204 | * The page fault came during copy_from_uspace() |
204 | * The page fault came during copy_from_uspace() |
205 | * or copy_to_uspace(). |
205 | * or copy_to_uspace(). |
206 | */ |
206 | */ |
207 | page_table_unlock(AS, true); |
207 | page_table_unlock(AS, true); |
208 | return; |
208 | return; |
209 | default: |
209 | default: |
210 | panic("unexpected pfrc (%d)\n", pfrc); |
210 | panic("unexpected pfrc (%d)\n", pfrc); |
211 | } |
211 | } |
212 | } |
212 | } |
213 | 213 | ||
214 | /* |
214 | /* |
215 | * Read the faulting TLB entry. |
215 | * Read the faulting TLB entry. |
216 | */ |
216 | */ |
217 | tlbr(); |
217 | tlbr(); |
218 | 218 | ||
219 | /* |
219 | /* |
220 | * Record access to PTE. |
220 | * Record access to PTE. |
221 | */ |
221 | */ |
222 | pte->a = 1; |
222 | pte->a = 1; |
223 | 223 | ||
224 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
224 | prepare_entry_lo(&lo, pte->g, pte->p, pte->d, pte->cacheable, pte->pfn); |
225 | 225 | ||
226 | /* |
226 | /* |
227 | * The entry is to be updated in TLB. |
227 | * The entry is to be updated in TLB. |
228 | */ |
228 | */ |
229 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
229 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
230 | cp0_entry_lo0_write(lo.value); |
230 | cp0_entry_lo0_write(lo.value); |
231 | else |
231 | else |
232 | cp0_entry_lo1_write(lo.value); |
232 | cp0_entry_lo1_write(lo.value); |
233 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
233 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
234 | tlbwi(); |
234 | tlbwi(); |
235 | 235 | ||
236 | page_table_unlock(AS, true); |
236 | page_table_unlock(AS, true); |
237 | return; |
237 | return; |
238 | 238 | ||
239 | fail: |
239 | fail: |
240 | page_table_unlock(AS, true); |
240 | page_table_unlock(AS, true); |
241 | tlb_invalid_fail(istate); |
241 | tlb_invalid_fail(istate); |
242 | } |
242 | } |
243 | 243 | ||
244 | /** Process TLB Modified Exception |
244 | /** Process TLB Modified Exception |
245 | * |
245 | * |
246 | * Process TLB Modified Exception. |
246 | * Process TLB Modified Exception. |
247 | * |
247 | * |
248 | * @param istate Interrupted register context. |
248 | * @param istate Interrupted register context. |
249 | */ |
249 | */ |
250 | void tlb_modified(istate_t *istate) |
250 | void tlb_modified(istate_t *istate) |
251 | { |
251 | { |
252 | tlb_index_t index; |
252 | tlb_index_t index; |
253 | uintptr_t badvaddr; |
253 | uintptr_t badvaddr; |
254 | entry_lo_t lo; |
254 | entry_lo_t lo; |
255 | entry_hi_t hi; |
255 | entry_hi_t hi; |
256 | pte_t *pte; |
256 | pte_t *pte; |
257 | int pfrc; |
257 | int pfrc; |
258 | 258 | ||
259 | badvaddr = cp0_badvaddr_read(); |
259 | badvaddr = cp0_badvaddr_read(); |
260 | 260 | ||
261 | /* |
261 | /* |
262 | * Locate the faulting entry in TLB. |
262 | * Locate the faulting entry in TLB. |
263 | */ |
263 | */ |
264 | hi.value = cp0_entry_hi_read(); |
264 | hi.value = cp0_entry_hi_read(); |
265 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
265 | prepare_entry_hi(&hi, hi.asid, badvaddr); |
266 | cp0_entry_hi_write(hi.value); |
266 | cp0_entry_hi_write(hi.value); |
267 | tlbp(); |
267 | tlbp(); |
268 | index.value = cp0_index_read(); |
268 | index.value = cp0_index_read(); |
269 | 269 | ||
270 | page_table_lock(AS, true); |
270 | page_table_lock(AS, true); |
271 | 271 | ||
272 | /* |
272 | /* |
273 | * Fail if the entry is not in TLB. |
273 | * Fail if the entry is not in TLB. |
274 | */ |
274 | */ |
275 | if (index.p) { |
275 | if (index.p) { |
276 | printf("TLB entry not found.\n"); |
276 | printf("TLB entry not found.\n"); |
277 | goto fail; |
277 | goto fail; |
278 | } |
278 | } |
279 | 279 | ||
280 | pte = find_mapping_and_check(badvaddr, PF_ACCESS_WRITE, istate, &pfrc); |
280 | pte = find_mapping_and_check(badvaddr, PF_ACCESS_WRITE, istate, &pfrc); |
281 | if (!pte) { |
281 | if (!pte) { |
282 | switch (pfrc) { |
282 | switch (pfrc) { |
283 | case AS_PF_FAULT: |
283 | case AS_PF_FAULT: |
284 | goto fail; |
284 | goto fail; |
285 | break; |
285 | break; |
286 | case AS_PF_DEFER: |
286 | case AS_PF_DEFER: |
287 | /* |
287 | /* |
288 | * The page fault came during copy_from_uspace() |
288 | * The page fault came during copy_from_uspace() |
289 | * or copy_to_uspace(). |
289 | * or copy_to_uspace(). |
290 | */ |
290 | */ |
291 | page_table_unlock(AS, true); |
291 | page_table_unlock(AS, true); |
292 | return; |
292 | return; |
293 | default: |
293 | default: |
294 | panic("unexpected pfrc (%d)\n", pfrc); |
294 | panic("unexpected pfrc (%d)\n", pfrc); |
295 | } |
295 | } |
296 | } |
296 | } |
297 | 297 | ||
298 | /* |
298 | /* |
299 | * Fail if the page is not writable. |
299 | * Fail if the page is not writable. |
300 | */ |
300 | */ |
301 | if (!pte->w) |
301 | if (!pte->w) |
302 | goto fail; |
302 | goto fail; |
303 | 303 | ||
304 | /* |
304 | /* |
305 | * Read the faulting TLB entry. |
305 | * Read the faulting TLB entry. |
306 | */ |
306 | */ |
307 | tlbr(); |
307 | tlbr(); |
308 | 308 | ||
309 | /* |
309 | /* |
310 | * Record access and write to PTE. |
310 | * Record access and write to PTE. |
311 | */ |
311 | */ |
312 | pte->a = 1; |
312 | pte->a = 1; |
313 | pte->d = 1; |
313 | pte->d = 1; |
314 | 314 | ||
315 | prepare_entry_lo(&lo, pte->g, pte->p, pte->w, pte->cacheable, pte->pfn); |
315 | prepare_entry_lo(&lo, pte->g, pte->p, pte->w, pte->cacheable, pte->pfn); |
316 | 316 | ||
317 | /* |
317 | /* |
318 | * The entry is to be updated in TLB. |
318 | * The entry is to be updated in TLB. |
319 | */ |
319 | */ |
320 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
320 | if ((badvaddr/PAGE_SIZE) % 2 == 0) |
321 | cp0_entry_lo0_write(lo.value); |
321 | cp0_entry_lo0_write(lo.value); |
322 | else |
322 | else |
323 | cp0_entry_lo1_write(lo.value); |
323 | cp0_entry_lo1_write(lo.value); |
324 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
324 | cp0_pagemask_write(TLB_PAGE_MASK_16K); |
325 | tlbwi(); |
325 | tlbwi(); |
326 | 326 | ||
327 | page_table_unlock(AS, true); |
327 | page_table_unlock(AS, true); |
328 | return; |
328 | return; |
329 | 329 | ||
330 | fail: |
330 | fail: |
331 | page_table_unlock(AS, true); |
331 | page_table_unlock(AS, true); |
332 | tlb_modified_fail(istate); |
332 | tlb_modified_fail(istate); |
333 | } |
333 | } |
334 | 334 | ||
335 | void tlb_refill_fail(istate_t *istate) |
335 | void tlb_refill_fail(istate_t *istate) |
336 | { |
336 | { |
337 | char *symbol = ""; |
337 | char *symbol = ""; |
338 | char *sym2 = ""; |
338 | char *sym2 = ""; |
339 | 339 | ||
340 | char *s = get_symtab_entry(istate->epc); |
340 | char *s = get_symtab_entry(istate->epc); |
341 | if (s) |
341 | if (s) |
342 | symbol = s; |
342 | symbol = s; |
343 | s = get_symtab_entry(istate->ra); |
343 | s = get_symtab_entry(istate->ra); |
344 | if (s) |
344 | if (s) |
345 | sym2 = s; |
345 | sym2 = s; |
346 | 346 | ||
347 | fault_if_from_uspace(istate, "TLB Refill Exception on %p", cp0_badvaddr_read()); |
347 | fault_if_from_uspace(istate, "TLB Refill Exception on %p", cp0_badvaddr_read()); |
348 | panic("%x: TLB Refill Exception at %x(%s<-%s)\n", cp0_badvaddr_read(), istate->epc, symbol, sym2); |
348 | panic("%x: TLB Refill Exception at %x(%s<-%s)\n", cp0_badvaddr_read(), istate->epc, symbol, sym2); |
349 | } |
349 | } |
350 | 350 | ||
351 | 351 | ||
352 | void tlb_invalid_fail(istate_t *istate) |
352 | void tlb_invalid_fail(istate_t *istate) |
353 | { |
353 | { |
354 | char *symbol = ""; |
354 | char *symbol = ""; |
355 | 355 | ||
356 | char *s = get_symtab_entry(istate->epc); |
356 | char *s = get_symtab_entry(istate->epc); |
357 | if (s) |
357 | if (s) |
358 | symbol = s; |
358 | symbol = s; |
359 | fault_if_from_uspace(istate, "TLB Invalid Exception on %p", cp0_badvaddr_read()); |
359 | fault_if_from_uspace(istate, "TLB Invalid Exception on %p", cp0_badvaddr_read()); |
360 | panic("%x: TLB Invalid Exception at %x(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
360 | panic("%x: TLB Invalid Exception at %x(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
361 | } |
361 | } |
362 | 362 | ||
363 | void tlb_modified_fail(istate_t *istate) |
363 | void tlb_modified_fail(istate_t *istate) |
364 | { |
364 | { |
365 | char *symbol = ""; |
365 | char *symbol = ""; |
366 | 366 | ||
367 | char *s = get_symtab_entry(istate->epc); |
367 | char *s = get_symtab_entry(istate->epc); |
368 | if (s) |
368 | if (s) |
369 | symbol = s; |
369 | symbol = s; |
370 | fault_if_from_uspace(istate, "TLB Modified Exception on %p", cp0_badvaddr_read()); |
370 | fault_if_from_uspace(istate, "TLB Modified Exception on %p", cp0_badvaddr_read()); |
371 | panic("%x: TLB Modified Exception at %x(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
371 | panic("%x: TLB Modified Exception at %x(%s)\n", cp0_badvaddr_read(), istate->epc, symbol); |
372 | } |
372 | } |
373 | 373 | ||
374 | /** Try to find PTE for faulting address |
374 | /** Try to find PTE for faulting address |
375 | * |
375 | * |
376 | * Try to find PTE for faulting address. |
376 | * Try to find PTE for faulting address. |
377 | * The AS->lock must be held on entry to this function. |
377 | * The AS->lock must be held on entry to this function. |
378 | * |
378 | * |
379 | * @param badvaddr Faulting virtual address. |
379 | * @param badvaddr Faulting virtual address. |
380 | * @param access Access mode that caused the fault. |
380 | * @param access Access mode that caused the fault. |
381 | * @param istate Pointer to interrupted state. |
381 | * @param istate Pointer to interrupted state. |
382 | * @param pfrc Pointer to variable where as_page_fault() return code will be stored. |
382 | * @param pfrc Pointer to variable where as_page_fault() return code will be stored. |
383 | * |
383 | * |
384 | * @return PTE on success, NULL otherwise. |
384 | * @return PTE on success, NULL otherwise. |
385 | */ |
385 | */ |
386 | pte_t *find_mapping_and_check(uintptr_t badvaddr, int access, istate_t *istate, int *pfrc) |
386 | pte_t *find_mapping_and_check(uintptr_t badvaddr, int access, istate_t *istate, int *pfrc) |
387 | { |
387 | { |
388 | entry_hi_t hi; |
388 | entry_hi_t hi; |
389 | pte_t *pte; |
389 | pte_t *pte; |
390 | 390 | ||
391 | hi.value = cp0_entry_hi_read(); |
391 | hi.value = cp0_entry_hi_read(); |
392 | 392 | ||
393 | /* |
393 | /* |
394 | * Handler cannot succeed if the ASIDs don't match. |
394 | * Handler cannot succeed if the ASIDs don't match. |
395 | */ |
395 | */ |
396 | if (hi.asid != AS->asid) { |
396 | if (hi.asid != AS->asid) { |
397 | printf("EntryHi.asid=%d, AS->asid=%d\n", hi.asid, AS->asid); |
397 | printf("EntryHi.asid=%d, AS->asid=%d\n", hi.asid, AS->asid); |
398 | return NULL; |
398 | return NULL; |
399 | } |
399 | } |
400 | 400 | ||
401 | /* |
401 | /* |
402 | * Check if the mapping exists in page tables. |
402 | * Check if the mapping exists in page tables. |
403 | */ |
403 | */ |
404 | pte = page_mapping_find(AS, badvaddr); |
404 | pte = page_mapping_find(AS, badvaddr); |
405 | if (pte && pte->p) { |
405 | if (pte && pte->p) { |
406 | /* |
406 | /* |
407 | * Mapping found in page tables. |
407 | * Mapping found in page tables. |
408 | * Immediately succeed. |
408 | * Immediately succeed. |
409 | */ |
409 | */ |
410 | return pte; |
410 | return pte; |
411 | } else { |
411 | } else { |
412 | int rc; |
412 | int rc; |
413 | 413 | ||
414 | /* |
414 | /* |
415 | * Mapping not found in page tables. |
415 | * Mapping not found in page tables. |
416 | * Resort to higher-level page fault handler. |
416 | * Resort to higher-level page fault handler. |
417 | */ |
417 | */ |
418 | page_table_unlock(AS, true); |
418 | page_table_unlock(AS, true); |
419 | switch (rc = as_page_fault(badvaddr, access, istate)) { |
419 | switch (rc = as_page_fault(badvaddr, access, istate)) { |
420 | case AS_PF_OK: |
420 | case AS_PF_OK: |
421 | /* |
421 | /* |
422 | * The higher-level page fault handler succeeded, |
422 | * The higher-level page fault handler succeeded, |
423 | * The mapping ought to be in place. |
423 | * The mapping ought to be in place. |
424 | */ |
424 | */ |
425 | page_table_lock(AS, true); |
425 | page_table_lock(AS, true); |
426 | pte = page_mapping_find(AS, badvaddr); |
426 | pte = page_mapping_find(AS, badvaddr); |
427 | ASSERT(pte && pte->p); |
427 | ASSERT(pte && pte->p); |
428 | return pte; |
428 | return pte; |
429 | break; |
429 | break; |
430 | case AS_PF_DEFER: |
430 | case AS_PF_DEFER: |
431 | page_table_lock(AS, true); |
431 | page_table_lock(AS, true); |
432 | *pfrc = AS_PF_DEFER; |
432 | *pfrc = AS_PF_DEFER; |
433 | return NULL; |
433 | return NULL; |
434 | break; |
434 | break; |
435 | case AS_PF_FAULT: |
435 | case AS_PF_FAULT: |
436 | page_table_lock(AS, true); |
436 | page_table_lock(AS, true); |
437 | printf("Page fault.\n"); |
437 | printf("Page fault.\n"); |
438 | *pfrc = AS_PF_FAULT; |
438 | *pfrc = AS_PF_FAULT; |
439 | return NULL; |
439 | return NULL; |
440 | break; |
440 | break; |
441 | default: |
441 | default: |
442 | panic("unexpected rc (%d)\n", rc); |
442 | panic("unexpected rc (%d)\n", rc); |
443 | } |
443 | } |
444 | 444 | ||
445 | } |
445 | } |
446 | } |
446 | } |
447 | 447 | ||
448 | void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn) |
448 | void prepare_entry_lo(entry_lo_t *lo, bool g, bool v, bool d, bool cacheable, uintptr_t pfn) |
449 | { |
449 | { |
450 | lo->value = 0; |
450 | lo->value = 0; |
451 | lo->g = g; |
451 | lo->g = g; |
452 | lo->v = v; |
452 | lo->v = v; |
453 | lo->d = d; |
453 | lo->d = d; |
454 | lo->c = cacheable ? PAGE_CACHEABLE_EXC_WRITE : PAGE_UNCACHED; |
454 | lo->c = cacheable ? PAGE_CACHEABLE_EXC_WRITE : PAGE_UNCACHED; |
455 | lo->pfn = pfn; |
455 | lo->pfn = pfn; |
456 | } |
456 | } |
457 | 457 | ||
458 | void prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr) |
458 | void prepare_entry_hi(entry_hi_t *hi, asid_t asid, uintptr_t addr) |
459 | { |
459 | { |
460 | hi->value = ALIGN_DOWN(addr, PAGE_SIZE * 2); |
460 | hi->value = ALIGN_DOWN(addr, PAGE_SIZE * 2); |
461 | hi->asid = asid; |
461 | hi->asid = asid; |
462 | } |
462 | } |
463 | 463 | ||
464 | /** Print contents of TLB. */ |
464 | /** Print contents of TLB. */ |
465 | void tlb_print(void) |
465 | void tlb_print(void) |
466 | { |
466 | { |
467 | page_mask_t mask; |
467 | page_mask_t mask; |
468 | entry_lo_t lo0, lo1; |
468 | entry_lo_t lo0, lo1; |
469 | entry_hi_t hi, hi_save; |
469 | entry_hi_t hi, hi_save; |
470 | unsigned int i; |
470 | unsigned int i; |
471 | 471 | ||
472 | hi_save.value = cp0_entry_hi_read(); |
472 | hi_save.value = cp0_entry_hi_read(); |
473 | 473 | ||
474 | printf("# ASID VPN2 MASK G V D C PFN\n"); |
474 | printf("# ASID VPN2 MASK G V D C PFN\n"); |
475 | printf("-- ---- ------ ---- - - - - ------\n"); |
475 | printf("-- ---- ------ ---- - - - - ------\n"); |
476 | 476 | ||
477 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
477 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
478 | cp0_index_write(i); |
478 | cp0_index_write(i); |
479 | tlbr(); |
479 | tlbr(); |
480 | 480 | ||
481 | mask.value = cp0_pagemask_read(); |
481 | mask.value = cp0_pagemask_read(); |
482 | hi.value = cp0_entry_hi_read(); |
482 | hi.value = cp0_entry_hi_read(); |
483 | lo0.value = cp0_entry_lo0_read(); |
483 | lo0.value = cp0_entry_lo0_read(); |
484 | lo1.value = cp0_entry_lo1_read(); |
484 | lo1.value = cp0_entry_lo1_read(); |
485 | 485 | ||
486 | printf("%-2u %-4u %#6x %#4x %1u %1u %1u %1u %#6x\n", |
486 | printf("%-2u %-4u %#6x %#4x %1u %1u %1u %1u %#6x\n", |
487 | i, hi.asid, hi.vpn2, mask.mask, |
487 | i, hi.asid, hi.vpn2, mask.mask, |
488 | lo0.g, lo0.v, lo0.d, lo0.c, lo0.pfn); |
488 | lo0.g, lo0.v, lo0.d, lo0.c, lo0.pfn); |
489 | printf(" %1u %1u %1u %1u %#6x\n", |
489 | printf(" %1u %1u %1u %1u %#6x\n", |
490 | lo1.g, lo1.v, lo1.d, lo1.c, lo1.pfn); |
490 | lo1.g, lo1.v, lo1.d, lo1.c, lo1.pfn); |
491 | } |
491 | } |
492 | 492 | ||
493 | cp0_entry_hi_write(hi_save.value); |
493 | cp0_entry_hi_write(hi_save.value); |
494 | } |
494 | } |
495 | 495 | ||
496 | /** Invalidate all not wired TLB entries. */ |
496 | /** Invalidate all not wired TLB entries. */ |
497 | void tlb_invalidate_all(void) |
497 | void tlb_invalidate_all(void) |
498 | { |
498 | { |
499 | ipl_t ipl; |
499 | ipl_t ipl; |
500 | entry_lo_t lo0, lo1; |
500 | entry_lo_t lo0, lo1; |
501 | entry_hi_t hi_save; |
501 | entry_hi_t hi_save; |
502 | int i; |
502 | int i; |
503 | 503 | ||
504 | hi_save.value = cp0_entry_hi_read(); |
504 | hi_save.value = cp0_entry_hi_read(); |
505 | ipl = interrupts_disable(); |
505 | ipl = interrupts_disable(); |
506 | 506 | ||
507 | for (i = TLB_WIRED; i < TLB_ENTRY_COUNT; i++) { |
507 | for (i = TLB_WIRED; i < TLB_ENTRY_COUNT; i++) { |
508 | cp0_index_write(i); |
508 | cp0_index_write(i); |
509 | tlbr(); |
509 | tlbr(); |
510 | 510 | ||
511 | lo0.value = cp0_entry_lo0_read(); |
511 | lo0.value = cp0_entry_lo0_read(); |
512 | lo1.value = cp0_entry_lo1_read(); |
512 | lo1.value = cp0_entry_lo1_read(); |
513 | 513 | ||
514 | lo0.v = 0; |
514 | lo0.v = 0; |
515 | lo1.v = 0; |
515 | lo1.v = 0; |
516 | 516 | ||
517 | cp0_entry_lo0_write(lo0.value); |
517 | cp0_entry_lo0_write(lo0.value); |
518 | cp0_entry_lo1_write(lo1.value); |
518 | cp0_entry_lo1_write(lo1.value); |
519 | 519 | ||
520 | tlbwi(); |
520 | tlbwi(); |
521 | } |
521 | } |
522 | 522 | ||
523 | interrupts_restore(ipl); |
523 | interrupts_restore(ipl); |
524 | cp0_entry_hi_write(hi_save.value); |
524 | cp0_entry_hi_write(hi_save.value); |
525 | } |
525 | } |
526 | 526 | ||
527 | /** Invalidate all TLB entries belonging to specified address space. |
527 | /** Invalidate all TLB entries belonging to specified address space. |
528 | * |
528 | * |
529 | * @param asid Address space identifier. |
529 | * @param asid Address space identifier. |
530 | */ |
530 | */ |
531 | void tlb_invalidate_asid(asid_t asid) |
531 | void tlb_invalidate_asid(asid_t asid) |
532 | { |
532 | { |
533 | ipl_t ipl; |
533 | ipl_t ipl; |
534 | entry_lo_t lo0, lo1; |
534 | entry_lo_t lo0, lo1; |
535 | entry_hi_t hi, hi_save; |
535 | entry_hi_t hi, hi_save; |
536 | int i; |
536 | int i; |
537 | 537 | ||
538 | ASSERT(asid != ASID_INVALID); |
538 | ASSERT(asid != ASID_INVALID); |
539 | 539 | ||
540 | hi_save.value = cp0_entry_hi_read(); |
540 | hi_save.value = cp0_entry_hi_read(); |
541 | ipl = interrupts_disable(); |
541 | ipl = interrupts_disable(); |
542 | 542 | ||
543 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
543 | for (i = 0; i < TLB_ENTRY_COUNT; i++) { |
544 | cp0_index_write(i); |
544 | cp0_index_write(i); |
545 | tlbr(); |
545 | tlbr(); |
546 | 546 | ||
547 | hi.value = cp0_entry_hi_read(); |
547 | hi.value = cp0_entry_hi_read(); |
548 | 548 | ||
549 | if (hi.asid == asid) { |
549 | if (hi.asid == asid) { |
550 | lo0.value = cp0_entry_lo0_read(); |
550 | lo0.value = cp0_entry_lo0_read(); |
551 | lo1.value = cp0_entry_lo1_read(); |
551 | lo1.value = cp0_entry_lo1_read(); |
552 | 552 | ||
553 | lo0.v = 0; |
553 | lo0.v = 0; |
554 | lo1.v = 0; |
554 | lo1.v = 0; |
555 | 555 | ||
556 | cp0_entry_lo0_write(lo0.value); |
556 | cp0_entry_lo0_write(lo0.value); |
557 | cp0_entry_lo1_write(lo1.value); |
557 | cp0_entry_lo1_write(lo1.value); |
558 | 558 | ||
559 | tlbwi(); |
559 | tlbwi(); |
560 | } |
560 | } |
561 | } |
561 | } |
562 | 562 | ||
563 | interrupts_restore(ipl); |
563 | interrupts_restore(ipl); |
564 | cp0_entry_hi_write(hi_save.value); |
564 | cp0_entry_hi_write(hi_save.value); |
565 | } |
565 | } |
566 | 566 | ||
567 | /** Invalidate TLB entries for specified page range belonging to specified address space. |
567 | /** Invalidate TLB entries for specified page range belonging to specified address space. |
568 | * |
568 | * |
569 | * @param asid Address space identifier. |
569 | * @param asid Address space identifier. |
570 | * @param page First page whose TLB entry is to be invalidated. |
570 | * @param page First page whose TLB entry is to be invalidated. |
571 | * @param cnt Number of entries to invalidate. |
571 | * @param cnt Number of entries to invalidate. |
572 | */ |
572 | */ |
573 | void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt) |
573 | void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt) |
574 | { |
574 | { |
575 | int i; |
575 | unsigned int i; |
576 | ipl_t ipl; |
576 | ipl_t ipl; |
577 | entry_lo_t lo0, lo1; |
577 | entry_lo_t lo0, lo1; |
578 | entry_hi_t hi, hi_save; |
578 | entry_hi_t hi, hi_save; |
579 | tlb_index_t index; |
579 | tlb_index_t index; |
580 | 580 | ||
581 | ASSERT(asid != ASID_INVALID); |
581 | ASSERT(asid != ASID_INVALID); |
582 | 582 | ||
583 | hi_save.value = cp0_entry_hi_read(); |
583 | hi_save.value = cp0_entry_hi_read(); |
584 | ipl = interrupts_disable(); |
584 | ipl = interrupts_disable(); |
585 | 585 | ||
586 | for (i = 0; i < cnt+1; i+=2) { |
586 | for (i = 0; i < cnt + 1; i += 2) { |
587 | hi.value = 0; |
587 | hi.value = 0; |
588 | prepare_entry_hi(&hi, asid, page + i * PAGE_SIZE); |
588 | prepare_entry_hi(&hi, asid, page + i * PAGE_SIZE); |
589 | cp0_entry_hi_write(hi.value); |
589 | cp0_entry_hi_write(hi.value); |
590 | 590 | ||
591 | tlbp(); |
591 | tlbp(); |
592 | index.value = cp0_index_read(); |
592 | index.value = cp0_index_read(); |
593 | 593 | ||
594 | if (!index.p) { |
594 | if (!index.p) { |
595 | /* Entry was found, index register contains valid index. */ |
595 | /* Entry was found, index register contains valid index. */ |
596 | tlbr(); |
596 | tlbr(); |
597 | 597 | ||
598 | lo0.value = cp0_entry_lo0_read(); |
598 | lo0.value = cp0_entry_lo0_read(); |
599 | lo1.value = cp0_entry_lo1_read(); |
599 | lo1.value = cp0_entry_lo1_read(); |
600 | 600 | ||
601 | lo0.v = 0; |
601 | lo0.v = 0; |
602 | lo1.v = 0; |
602 | lo1.v = 0; |
603 | 603 | ||
604 | cp0_entry_lo0_write(lo0.value); |
604 | cp0_entry_lo0_write(lo0.value); |
605 | cp0_entry_lo1_write(lo1.value); |
605 | cp0_entry_lo1_write(lo1.value); |
606 | 606 | ||
607 | tlbwi(); |
607 | tlbwi(); |
608 | } |
608 | } |
609 | } |
609 | } |
610 | 610 | ||
611 | interrupts_restore(ipl); |
611 | interrupts_restore(ipl); |
612 | cp0_entry_hi_write(hi_save.value); |
612 | cp0_entry_hi_write(hi_save.value); |
613 | } |
613 | } |
614 | 614 | ||
615 | /** @} |
615 | /** @} |
616 | */ |
616 | */ |
617 | 617 |