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docs/system/gdb.rst: Add some more heading structure
[qemu/ar7.git] / target / ppc / mmu-hash32.c
blob178cf090b72eef4af5213d2fa19b1ed5a914a122
1 /*
2 * PowerPC MMU, TLB and BAT emulation helpers for QEMU.
3 *
4 * Copyright (c) 2003-2007 Jocelyn Mayer
5 * Copyright (c) 2013 David Gibson, IBM Corporation
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "exec/exec-all.h"
24 #include "exec/helper-proto.h"
25 #include "sysemu/kvm.h"
26 #include "kvm_ppc.h"
27 #include "mmu-hash32.h"
28 #include "exec/log.h"
29
30 /* #define DEBUG_BAT */
31
32 #ifdef DEBUG_BATS
33 # define LOG_BATS(...) qemu_log_mask(CPU_LOG_MMU, __VA_ARGS__)
34 #else
35 # define LOG_BATS(...) do { } while (0)
36 #endif
37
38 struct mmu_ctx_hash32 {
39 hwaddr raddr; /* Real address */
40 int prot; /* Protection bits */
41 int key; /* Access key */
42 };
43
44 static int ppc_hash32_pp_prot(int key, int pp, int nx)
45 {
46 int prot;
47
48 if (key == 0) {
49 switch (pp) {
50 case 0x0:
51 case 0x1:
52 case 0x2:
53 prot = PAGE_READ | PAGE_WRITE;
54 break;
55
56 case 0x3:
57 prot = PAGE_READ;
58 break;
59
60 default:
61 abort();
62 }
63 } else {
64 switch (pp) {
65 case 0x0:
66 prot = 0;
67 break;
68
69 case 0x1:
70 case 0x3:
71 prot = PAGE_READ;
72 break;
73
74 case 0x2:
75 prot = PAGE_READ | PAGE_WRITE;
76 break;
77
78 default:
79 abort();
80 }
81 }
82 if (nx == 0) {
83 prot |= PAGE_EXEC;
84 }
85
86 return prot;
87 }
88
89 static int ppc_hash32_pte_prot(PowerPCCPU *cpu,
90 target_ulong sr, ppc_hash_pte32_t pte)
91 {
92 CPUPPCState *env = &cpu->env;
93 unsigned pp, key;
94
95 key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS));
96 pp = pte.pte1 & HPTE32_R_PP;
97
98 return ppc_hash32_pp_prot(key, pp, !!(sr & SR32_NX));
99 }
100
101 static target_ulong hash32_bat_size(PowerPCCPU *cpu,
102 target_ulong batu, target_ulong batl)
103 {
104 CPUPPCState *env = &cpu->env;
105
106 if ((msr_pr && !(batu & BATU32_VP))
107 || (!msr_pr && !(batu & BATU32_VS))) {
108 return 0;
109 }
110
111 return BATU32_BEPI & ~((batu & BATU32_BL) << 15);
112 }
113
114 static int hash32_bat_prot(PowerPCCPU *cpu,
115 target_ulong batu, target_ulong batl)
116 {
117 int pp, prot;
118
119 prot = 0;
120 pp = batl & BATL32_PP;
121 if (pp != 0) {
122 prot = PAGE_READ | PAGE_EXEC;
123 if (pp == 0x2) {
124 prot |= PAGE_WRITE;
125 }
126 }
127 return prot;
128 }
129
130 static target_ulong hash32_bat_601_size(PowerPCCPU *cpu,
131 target_ulong batu, target_ulong batl)
132 {
133 if (!(batl & BATL32_601_V)) {
134 return 0;
135 }
136
137 return BATU32_BEPI & ~((batl & BATL32_601_BL) << 17);
138 }
139
140 static int hash32_bat_601_prot(PowerPCCPU *cpu,
141 target_ulong batu, target_ulong batl)
142 {
143 CPUPPCState *env = &cpu->env;
144 int key, pp;
145
146 pp = batu & BATU32_601_PP;
147 if (msr_pr == 0) {
148 key = !!(batu & BATU32_601_KS);
149 } else {
150 key = !!(batu & BATU32_601_KP);
151 }
152 return ppc_hash32_pp_prot(key, pp, 0);
153 }
154
155 static hwaddr ppc_hash32_bat_lookup(PowerPCCPU *cpu, target_ulong ea, int rwx,
156 int *prot)
157 {
158 CPUPPCState *env = &cpu->env;
159 target_ulong *BATlt, *BATut;
160 int i;
161
162 LOG_BATS("%s: %cBAT v " TARGET_FMT_lx "\n", __func__,
163 rwx == 2 ? 'I' : 'D', ea);
164 if (rwx == 2) {
165 BATlt = env->IBAT[1];
166 BATut = env->IBAT[0];
167 } else {
168 BATlt = env->DBAT[1];
169 BATut = env->DBAT[0];
170 }
171 for (i = 0; i < env->nb_BATs; i++) {
172 target_ulong batu = BATut[i];
173 target_ulong batl = BATlt[i];
174 target_ulong mask;
175
176 if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
177 mask = hash32_bat_601_size(cpu, batu, batl);
178 } else {
179 mask = hash32_bat_size(cpu, batu, batl);
180 }
181 LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
182 " BATl " TARGET_FMT_lx "\n", __func__,
183 type == ACCESS_CODE ? 'I' : 'D', i, ea, batu, batl);
184
185 if (mask && ((ea & mask) == (batu & BATU32_BEPI))) {
186 hwaddr raddr = (batl & mask) | (ea & ~mask);
187
188 if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
189 *prot = hash32_bat_601_prot(cpu, batu, batl);
190 } else {
191 *prot = hash32_bat_prot(cpu, batu, batl);
192 }
193
194 return raddr & TARGET_PAGE_MASK;
195 }
196 }
197
198 /* No hit */
199 #if defined(DEBUG_BATS)
200 if (qemu_log_enabled()) {
201 LOG_BATS("no BAT match for " TARGET_FMT_lx ":\n", ea);
202 for (i = 0; i < 4; i++) {
203 BATu = &BATut[i];
204 BATl = &BATlt[i];
205 BEPIu = *BATu & BATU32_BEPIU;
206 BEPIl = *BATu & BATU32_BEPIL;
207 bl = (*BATu & 0x00001FFC) << 15;
208 LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
209 " BATl " TARGET_FMT_lx "\n\t" TARGET_FMT_lx " "
210 TARGET_FMT_lx " " TARGET_FMT_lx "\n",
211 __func__, type == ACCESS_CODE ? 'I' : 'D', i, ea,
212 *BATu, *BATl, BEPIu, BEPIl, bl);
213 }
214 }
215 #endif
216
217 return -1;
218 }
219
220 static int ppc_hash32_direct_store(PowerPCCPU *cpu, target_ulong sr,
221 target_ulong eaddr, int rwx,
222 hwaddr *raddr, int *prot)
223 {
224 CPUState *cs = CPU(cpu);
225 CPUPPCState *env = &cpu->env;
226 int key = !!(msr_pr ? (sr & SR32_KP) : (sr & SR32_KS));
227
228 qemu_log_mask(CPU_LOG_MMU, "direct store...\n");
229
230 if ((sr & 0x1FF00000) >> 20 == 0x07f) {
231 /*
232 * Memory-forced I/O controller interface access
233 *
234 * If T=1 and BUID=x'07F', the 601 performs a memory access
235 * to SR[28-31] LA[4-31], bypassing all protection mechanisms.
236 */
237 *raddr = ((sr & 0xF) << 28) | (eaddr & 0x0FFFFFFF);
238 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
239 return 0;
240 }
241
242 if (rwx == 2) {
243 /* No code fetch is allowed in direct-store areas */
244 cs->exception_index = POWERPC_EXCP_ISI;
245 env->error_code = 0x10000000;
246 return 1;
247 }
248
249 switch (env->access_type) {
250 case ACCESS_INT:
251 /* Integer load/store : only access allowed */
252 break;
253 case ACCESS_FLOAT:
254 /* Floating point load/store */
255 cs->exception_index = POWERPC_EXCP_ALIGN;
256 env->error_code = POWERPC_EXCP_ALIGN_FP;
257 env->spr[SPR_DAR] = eaddr;
258 return 1;
259 case ACCESS_RES:
260 /* lwarx, ldarx or srwcx. */
261 env->error_code = 0;
262 env->spr[SPR_DAR] = eaddr;
263 if (rwx == 1) {
264 env->spr[SPR_DSISR] = 0x06000000;
265 } else {
266 env->spr[SPR_DSISR] = 0x04000000;
267 }
268 return 1;
269 case ACCESS_CACHE:
270 /*
271 * dcba, dcbt, dcbtst, dcbf, dcbi, dcbst, dcbz, or icbi
272 *
273 * Should make the instruction do no-op. As it already do
274 * no-op, it's quite easy :-)
275 */
276 *raddr = eaddr;
277 return 0;
278 case ACCESS_EXT:
279 /* eciwx or ecowx */
280 cs->exception_index = POWERPC_EXCP_DSI;
281 env->error_code = 0;
282 env->spr[SPR_DAR] = eaddr;
283 if (rwx == 1) {
284 env->spr[SPR_DSISR] = 0x06100000;
285 } else {
286 env->spr[SPR_DSISR] = 0x04100000;
287 }
288 return 1;
289 default:
290 cpu_abort(cs, "ERROR: instruction should not need "
291 "address translation\n");
292 }
293 if ((rwx == 1 || key != 1) && (rwx == 0 || key != 0)) {
294 *raddr = eaddr;
295 return 0;
296 } else {
297 cs->exception_index = POWERPC_EXCP_DSI;
298 env->error_code = 0;
299 env->spr[SPR_DAR] = eaddr;
300 if (rwx == 1) {
301 env->spr[SPR_DSISR] = 0x0a000000;
302 } else {
303 env->spr[SPR_DSISR] = 0x08000000;
304 }
305 return 1;
306 }
307 }
308
309 hwaddr get_pteg_offset32(PowerPCCPU *cpu, hwaddr hash)
310 {
311 target_ulong mask = ppc_hash32_hpt_mask(cpu);
312
313 return (hash * HASH_PTEG_SIZE_32) & mask;
314 }
315
316 static hwaddr ppc_hash32_pteg_search(PowerPCCPU *cpu, hwaddr pteg_off,
317 bool secondary, target_ulong ptem,
318 ppc_hash_pte32_t *pte)
319 {
320 hwaddr pte_offset = pteg_off;
321 target_ulong pte0, pte1;
322 int i;
323
324 for (i = 0; i < HPTES_PER_GROUP; i++) {
325 pte0 = ppc_hash32_load_hpte0(cpu, pte_offset);
326 /*
327 * pte0 contains the valid bit and must be read before pte1,
328 * otherwise we might see an old pte1 with a new valid bit and
329 * thus an inconsistent hpte value
330 */
331 smp_rmb();
332 pte1 = ppc_hash32_load_hpte1(cpu, pte_offset);
333
334 if ((pte0 & HPTE32_V_VALID)
335 && (secondary == !!(pte0 & HPTE32_V_SECONDARY))
336 && HPTE32_V_COMPARE(pte0, ptem)) {
337 pte->pte0 = pte0;
338 pte->pte1 = pte1;
339 return pte_offset;
340 }
341
342 pte_offset += HASH_PTE_SIZE_32;
343 }
344
345 return -1;
346 }
347
348 static void ppc_hash32_set_r(PowerPCCPU *cpu, hwaddr pte_offset, uint32_t pte1)
349 {
350 target_ulong base = ppc_hash32_hpt_base(cpu);
351 hwaddr offset = pte_offset + 6;
352
353 /* The HW performs a non-atomic byte update */
354 stb_phys(CPU(cpu)->as, base + offset, ((pte1 >> 8) & 0xff) | 0x01);
355 }
356
357 static void ppc_hash32_set_c(PowerPCCPU *cpu, hwaddr pte_offset, uint64_t pte1)
358 {
359 target_ulong base = ppc_hash32_hpt_base(cpu);
360 hwaddr offset = pte_offset + 7;
361
362 /* The HW performs a non-atomic byte update */
363 stb_phys(CPU(cpu)->as, base + offset, (pte1 & 0xff) | 0x80);
364 }
365
366 static hwaddr ppc_hash32_htab_lookup(PowerPCCPU *cpu,
367 target_ulong sr, target_ulong eaddr,
368 ppc_hash_pte32_t *pte)
369 {
370 hwaddr pteg_off, pte_offset;
371 hwaddr hash;
372 uint32_t vsid, pgidx, ptem;
373
374 vsid = sr & SR32_VSID;
375 pgidx = (eaddr & ~SEGMENT_MASK_256M) >> TARGET_PAGE_BITS;
376 hash = vsid ^ pgidx;
377 ptem = (vsid << 7) | (pgidx >> 10);
378
379 /* Page address translation */
380 qemu_log_mask(CPU_LOG_MMU, "htab_base " TARGET_FMT_plx
381 " htab_mask " TARGET_FMT_plx
382 " hash " TARGET_FMT_plx "\n",
383 ppc_hash32_hpt_base(cpu), ppc_hash32_hpt_mask(cpu), hash);
384
385 /* Primary PTEG lookup */
386 qemu_log_mask(CPU_LOG_MMU, "0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
387 " vsid=%" PRIx32 " ptem=%" PRIx32
388 " hash=" TARGET_FMT_plx "\n",
389 ppc_hash32_hpt_base(cpu), ppc_hash32_hpt_mask(cpu),
390 vsid, ptem, hash);
391 pteg_off = get_pteg_offset32(cpu, hash);
392 pte_offset = ppc_hash32_pteg_search(cpu, pteg_off, 0, ptem, pte);
393 if (pte_offset == -1) {
394 /* Secondary PTEG lookup */
395 qemu_log_mask(CPU_LOG_MMU, "1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
396 " vsid=%" PRIx32 " api=%" PRIx32
397 " hash=" TARGET_FMT_plx "\n", ppc_hash32_hpt_base(cpu),
398 ppc_hash32_hpt_mask(cpu), vsid, ptem, ~hash);
399 pteg_off = get_pteg_offset32(cpu, ~hash);
400 pte_offset = ppc_hash32_pteg_search(cpu, pteg_off, 1, ptem, pte);
401 }
402
403 return pte_offset;
404 }
405
406 static hwaddr ppc_hash32_pte_raddr(target_ulong sr, ppc_hash_pte32_t pte,
407 target_ulong eaddr)
408 {
409 hwaddr rpn = pte.pte1 & HPTE32_R_RPN;
410 hwaddr mask = ~TARGET_PAGE_MASK;
411
412 return (rpn & ~mask) | (eaddr & mask);
413 }
414
415 int ppc_hash32_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr, int rwx,
416 int mmu_idx)
417 {
418 CPUState *cs = CPU(cpu);
419 CPUPPCState *env = &cpu->env;
420 target_ulong sr;
421 hwaddr pte_offset;
422 ppc_hash_pte32_t pte;
423 int prot;
424 const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC};
425 hwaddr raddr;
426
427 assert((rwx == 0) || (rwx == 1) || (rwx == 2));
428
429 /* 1. Handle real mode accesses */
430 if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
431 /* Translation is off */
432 raddr = eaddr;
433 tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
434 PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx,
435 TARGET_PAGE_SIZE);
436 return 0;
437 }
438
439 /* 2. Check Block Address Translation entries (BATs) */
440 if (env->nb_BATs != 0) {
441 raddr = ppc_hash32_bat_lookup(cpu, eaddr, rwx, &prot);
442 if (raddr != -1) {
443 if (need_prot[rwx] & ~prot) {
444 if (rwx == 2) {
445 cs->exception_index = POWERPC_EXCP_ISI;
446 env->error_code = 0x08000000;
447 } else {
448 cs->exception_index = POWERPC_EXCP_DSI;
449 env->error_code = 0;
450 env->spr[SPR_DAR] = eaddr;
451 if (rwx == 1) {
452 env->spr[SPR_DSISR] = 0x0a000000;
453 } else {
454 env->spr[SPR_DSISR] = 0x08000000;
455 }
456 }
457 return 1;
458 }
459
460 tlb_set_page(cs, eaddr & TARGET_PAGE_MASK,
461 raddr & TARGET_PAGE_MASK, prot, mmu_idx,
462 TARGET_PAGE_SIZE);
463 return 0;
464 }
465 }
466
467 /* 3. Look up the Segment Register */
468 sr = env->sr[eaddr >> 28];
469
470 /* 4. Handle direct store segments */
471 if (sr & SR32_T) {
472 if (ppc_hash32_direct_store(cpu, sr, eaddr, rwx,
473 &raddr, &prot) == 0) {
474 tlb_set_page(cs, eaddr & TARGET_PAGE_MASK,
475 raddr & TARGET_PAGE_MASK, prot, mmu_idx,
476 TARGET_PAGE_SIZE);
477 return 0;
478 } else {
479 return 1;
480 }
481 }
482
483 /* 5. Check for segment level no-execute violation */
484 if ((rwx == 2) && (sr & SR32_NX)) {
485 cs->exception_index = POWERPC_EXCP_ISI;
486 env->error_code = 0x10000000;
487 return 1;
488 }
489
490 /* 6. Locate the PTE in the hash table */
491 pte_offset = ppc_hash32_htab_lookup(cpu, sr, eaddr, &pte);
492 if (pte_offset == -1) {
493 if (rwx == 2) {
494 cs->exception_index = POWERPC_EXCP_ISI;
495 env->error_code = 0x40000000;
496 } else {
497 cs->exception_index = POWERPC_EXCP_DSI;
498 env->error_code = 0;
499 env->spr[SPR_DAR] = eaddr;
500 if (rwx == 1) {
501 env->spr[SPR_DSISR] = 0x42000000;
502 } else {
503 env->spr[SPR_DSISR] = 0x40000000;
504 }
505 }
506
507 return 1;
508 }
509 qemu_log_mask(CPU_LOG_MMU,
510 "found PTE at offset %08" HWADDR_PRIx "\n", pte_offset);
511
512 /* 7. Check access permissions */
513
514 prot = ppc_hash32_pte_prot(cpu, sr, pte);
515
516 if (need_prot[rwx] & ~prot) {
517 /* Access right violation */
518 qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
519 if (rwx == 2) {
520 cs->exception_index = POWERPC_EXCP_ISI;
521 env->error_code = 0x08000000;
522 } else {
523 cs->exception_index = POWERPC_EXCP_DSI;
524 env->error_code = 0;
525 env->spr[SPR_DAR] = eaddr;
526 if (rwx == 1) {
527 env->spr[SPR_DSISR] = 0x0a000000;
528 } else {
529 env->spr[SPR_DSISR] = 0x08000000;
530 }
531 }
532 return 1;
533 }
534
535 qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");
536
537 /* 8. Update PTE referenced and changed bits if necessary */
538
539 if (!(pte.pte1 & HPTE32_R_R)) {
540 ppc_hash32_set_r(cpu, pte_offset, pte.pte1);
541 }
542 if (!(pte.pte1 & HPTE32_R_C)) {
543 if (rwx == 1) {
544 ppc_hash32_set_c(cpu, pte_offset, pte.pte1);
545 } else {
546 /*
547 * Treat the page as read-only for now, so that a later write
548 * will pass through this function again to set the C bit
549 */
550 prot &= ~PAGE_WRITE;
551 }
552 }
553
554 /* 9. Determine the real address from the PTE */
555
556 raddr = ppc_hash32_pte_raddr(sr, pte, eaddr);
557
558 tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
559 prot, mmu_idx, TARGET_PAGE_SIZE);
560
561 return 0;
562 }
563
564 hwaddr ppc_hash32_get_phys_page_debug(PowerPCCPU *cpu, target_ulong eaddr)
565 {
566 CPUPPCState *env = &cpu->env;
567 target_ulong sr;
568 hwaddr pte_offset;
569 ppc_hash_pte32_t pte;
570 int prot;
571
572 if (msr_dr == 0) {
573 /* Translation is off */
574 return eaddr;
575 }
576
577 if (env->nb_BATs != 0) {
578 hwaddr raddr = ppc_hash32_bat_lookup(cpu, eaddr, 0, &prot);
579 if (raddr != -1) {
580 return raddr;
581 }
582 }
583
584 sr = env->sr[eaddr >> 28];
585
586 if (sr & SR32_T) {
587 /* FIXME: Add suitable debug support for Direct Store segments */
588 return -1;
589 }
590
591 pte_offset = ppc_hash32_htab_lookup(cpu, sr, eaddr, &pte);
592 if (pte_offset == -1) {
593 return -1;
594 }
595
596 return ppc_hash32_pte_raddr(sr, pte, eaddr) & TARGET_PAGE_MASK;
597 }
AR7 emulation for QEMU