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