mmu_helper.c (38361B)
1/* 2 * Copyright (c) 2011 - 2019, Max Filippov, Open Source and Linux Lab. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * * Neither the name of the Open Source and Linux Lab nor the 13 * names of its contributors may be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "qemu/osdep.h" 29#include "qemu/main-loop.h" 30#include "qemu/qemu-print.h" 31#include "qemu/units.h" 32#include "cpu.h" 33#include "exec/helper-proto.h" 34#include "qemu/host-utils.h" 35#include "exec/exec-all.h" 36#include "exec/cpu_ldst.h" 37 38#define XTENSA_MPU_SEGMENT_MASK 0x0000001f 39#define XTENSA_MPU_ACC_RIGHTS_MASK 0x00000f00 40#define XTENSA_MPU_ACC_RIGHTS_SHIFT 8 41#define XTENSA_MPU_MEM_TYPE_MASK 0x001ff000 42#define XTENSA_MPU_MEM_TYPE_SHIFT 12 43#define XTENSA_MPU_ATTR_MASK 0x001fff00 44 45#define XTENSA_MPU_PROBE_B 0x40000000 46#define XTENSA_MPU_PROBE_V 0x80000000 47 48#define XTENSA_MPU_SYSTEM_TYPE_DEVICE 0x0001 49#define XTENSA_MPU_SYSTEM_TYPE_NC 0x0002 50#define XTENSA_MPU_SYSTEM_TYPE_C 0x0003 51#define XTENSA_MPU_SYSTEM_TYPE_MASK 0x0003 52 53#define XTENSA_MPU_TYPE_SYS_C 0x0010 54#define XTENSA_MPU_TYPE_SYS_W 0x0020 55#define XTENSA_MPU_TYPE_SYS_R 0x0040 56#define XTENSA_MPU_TYPE_CPU_C 0x0100 57#define XTENSA_MPU_TYPE_CPU_W 0x0200 58#define XTENSA_MPU_TYPE_CPU_R 0x0400 59#define XTENSA_MPU_TYPE_CPU_CACHE 0x0800 60#define XTENSA_MPU_TYPE_B 0x1000 61#define XTENSA_MPU_TYPE_INT 0x2000 62 63void HELPER(itlb_hit_test)(CPUXtensaState *env, uint32_t vaddr) 64{ 65 /* 66 * Probe the memory; we don't care about the result but 67 * only the side-effects (ie any MMU or other exception) 68 */ 69 probe_access(env, vaddr, 1, MMU_INST_FETCH, 70 cpu_mmu_index(env, true), GETPC()); 71} 72 73void HELPER(wsr_rasid)(CPUXtensaState *env, uint32_t v) 74{ 75 v = (v & 0xffffff00) | 0x1; 76 if (v != env->sregs[RASID]) { 77 env->sregs[RASID] = v; 78 tlb_flush(env_cpu(env)); 79 } 80} 81 82static uint32_t get_page_size(const CPUXtensaState *env, 83 bool dtlb, uint32_t way) 84{ 85 uint32_t tlbcfg = env->sregs[dtlb ? DTLBCFG : ITLBCFG]; 86 87 switch (way) { 88 case 4: 89 return (tlbcfg >> 16) & 0x3; 90 91 case 5: 92 return (tlbcfg >> 20) & 0x1; 93 94 case 6: 95 return (tlbcfg >> 24) & 0x1; 96 97 default: 98 return 0; 99 } 100} 101 102/*! 103 * Get bit mask for the virtual address bits translated by the TLB way 104 */ 105static uint32_t xtensa_tlb_get_addr_mask(const CPUXtensaState *env, 106 bool dtlb, uint32_t way) 107{ 108 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 109 bool varway56 = dtlb ? 110 env->config->dtlb.varway56 : 111 env->config->itlb.varway56; 112 113 switch (way) { 114 case 4: 115 return 0xfff00000 << get_page_size(env, dtlb, way) * 2; 116 117 case 5: 118 if (varway56) { 119 return 0xf8000000 << get_page_size(env, dtlb, way); 120 } else { 121 return 0xf8000000; 122 } 123 124 case 6: 125 if (varway56) { 126 return 0xf0000000 << (1 - get_page_size(env, dtlb, way)); 127 } else { 128 return 0xf0000000; 129 } 130 131 default: 132 return 0xfffff000; 133 } 134 } else { 135 return REGION_PAGE_MASK; 136 } 137} 138 139/*! 140 * Get bit mask for the 'VPN without index' field. 141 * See ISA, 4.6.5.6, data format for RxTLB0 142 */ 143static uint32_t get_vpn_mask(const CPUXtensaState *env, bool dtlb, uint32_t way) 144{ 145 if (way < 4) { 146 bool is32 = (dtlb ? 147 env->config->dtlb.nrefillentries : 148 env->config->itlb.nrefillentries) == 32; 149 return is32 ? 0xffff8000 : 0xffffc000; 150 } else if (way == 4) { 151 return xtensa_tlb_get_addr_mask(env, dtlb, way) << 2; 152 } else if (way <= 6) { 153 uint32_t mask = xtensa_tlb_get_addr_mask(env, dtlb, way); 154 bool varway56 = dtlb ? 155 env->config->dtlb.varway56 : 156 env->config->itlb.varway56; 157 158 if (varway56) { 159 return mask << (way == 5 ? 2 : 3); 160 } else { 161 return mask << 1; 162 } 163 } else { 164 return 0xfffff000; 165 } 166} 167 168/*! 169 * Split virtual address into VPN (with index) and entry index 170 * for the given TLB way 171 */ 172static void split_tlb_entry_spec_way(const CPUXtensaState *env, uint32_t v, 173 bool dtlb, uint32_t *vpn, 174 uint32_t wi, uint32_t *ei) 175{ 176 bool varway56 = dtlb ? 177 env->config->dtlb.varway56 : 178 env->config->itlb.varway56; 179 180 if (!dtlb) { 181 wi &= 7; 182 } 183 184 if (wi < 4) { 185 bool is32 = (dtlb ? 186 env->config->dtlb.nrefillentries : 187 env->config->itlb.nrefillentries) == 32; 188 *ei = (v >> 12) & (is32 ? 0x7 : 0x3); 189 } else { 190 switch (wi) { 191 case 4: 192 { 193 uint32_t eibase = 20 + get_page_size(env, dtlb, wi) * 2; 194 *ei = (v >> eibase) & 0x3; 195 } 196 break; 197 198 case 5: 199 if (varway56) { 200 uint32_t eibase = 27 + get_page_size(env, dtlb, wi); 201 *ei = (v >> eibase) & 0x3; 202 } else { 203 *ei = (v >> 27) & 0x1; 204 } 205 break; 206 207 case 6: 208 if (varway56) { 209 uint32_t eibase = 29 - get_page_size(env, dtlb, wi); 210 *ei = (v >> eibase) & 0x7; 211 } else { 212 *ei = (v >> 28) & 0x1; 213 } 214 break; 215 216 default: 217 *ei = 0; 218 break; 219 } 220 } 221 *vpn = v & xtensa_tlb_get_addr_mask(env, dtlb, wi); 222} 223 224/*! 225 * Split TLB address into TLB way, entry index and VPN (with index). 226 * See ISA, 4.6.5.5 - 4.6.5.8 for the TLB addressing format 227 */ 228static void split_tlb_entry_spec(CPUXtensaState *env, uint32_t v, bool dtlb, 229 uint32_t *vpn, uint32_t *wi, uint32_t *ei) 230{ 231 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 232 *wi = v & (dtlb ? 0xf : 0x7); 233 split_tlb_entry_spec_way(env, v, dtlb, vpn, *wi, ei); 234 } else { 235 *vpn = v & REGION_PAGE_MASK; 236 *wi = 0; 237 *ei = (v >> 29) & 0x7; 238 } 239} 240 241static xtensa_tlb_entry *xtensa_tlb_get_entry(CPUXtensaState *env, bool dtlb, 242 unsigned wi, unsigned ei) 243{ 244 return dtlb ? 245 env->dtlb[wi] + ei : 246 env->itlb[wi] + ei; 247} 248 249static xtensa_tlb_entry *get_tlb_entry(CPUXtensaState *env, 250 uint32_t v, bool dtlb, uint32_t *pwi) 251{ 252 uint32_t vpn; 253 uint32_t wi; 254 uint32_t ei; 255 256 split_tlb_entry_spec(env, v, dtlb, &vpn, &wi, &ei); 257 if (pwi) { 258 *pwi = wi; 259 } 260 return xtensa_tlb_get_entry(env, dtlb, wi, ei); 261} 262 263static void xtensa_tlb_set_entry_mmu(const CPUXtensaState *env, 264 xtensa_tlb_entry *entry, bool dtlb, 265 unsigned wi, unsigned ei, uint32_t vpn, 266 uint32_t pte) 267{ 268 entry->vaddr = vpn; 269 entry->paddr = pte & xtensa_tlb_get_addr_mask(env, dtlb, wi); 270 entry->asid = (env->sregs[RASID] >> ((pte >> 1) & 0x18)) & 0xff; 271 entry->attr = pte & 0xf; 272} 273 274static void xtensa_tlb_set_entry(CPUXtensaState *env, bool dtlb, 275 unsigned wi, unsigned ei, 276 uint32_t vpn, uint32_t pte) 277{ 278 CPUState *cs = env_cpu(env); 279 xtensa_tlb_entry *entry = xtensa_tlb_get_entry(env, dtlb, wi, ei); 280 281 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 282 if (entry->variable) { 283 if (entry->asid) { 284 tlb_flush_page(cs, entry->vaddr); 285 } 286 xtensa_tlb_set_entry_mmu(env, entry, dtlb, wi, ei, vpn, pte); 287 tlb_flush_page(cs, entry->vaddr); 288 } else { 289 qemu_log_mask(LOG_GUEST_ERROR, 290 "%s %d, %d, %d trying to set immutable entry\n", 291 __func__, dtlb, wi, ei); 292 } 293 } else { 294 tlb_flush_page(cs, entry->vaddr); 295 if (xtensa_option_enabled(env->config, 296 XTENSA_OPTION_REGION_TRANSLATION)) { 297 entry->paddr = pte & REGION_PAGE_MASK; 298 } 299 entry->attr = pte & 0xf; 300 } 301} 302 303hwaddr xtensa_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) 304{ 305 XtensaCPU *cpu = XTENSA_CPU(cs); 306 uint32_t paddr; 307 uint32_t page_size; 308 unsigned access; 309 310 if (xtensa_get_physical_addr(&cpu->env, false, addr, 0, 0, 311 &paddr, &page_size, &access) == 0) { 312 return paddr; 313 } 314 if (xtensa_get_physical_addr(&cpu->env, false, addr, 2, 0, 315 &paddr, &page_size, &access) == 0) { 316 return paddr; 317 } 318 return ~0; 319} 320 321static void reset_tlb_mmu_all_ways(CPUXtensaState *env, 322 const xtensa_tlb *tlb, 323 xtensa_tlb_entry entry[][MAX_TLB_WAY_SIZE]) 324{ 325 unsigned wi, ei; 326 327 for (wi = 0; wi < tlb->nways; ++wi) { 328 for (ei = 0; ei < tlb->way_size[wi]; ++ei) { 329 entry[wi][ei].asid = 0; 330 entry[wi][ei].variable = true; 331 } 332 } 333} 334 335static void reset_tlb_mmu_ways56(CPUXtensaState *env, 336 const xtensa_tlb *tlb, 337 xtensa_tlb_entry entry[][MAX_TLB_WAY_SIZE]) 338{ 339 if (!tlb->varway56) { 340 static const xtensa_tlb_entry way5[] = { 341 { 342 .vaddr = 0xd0000000, 343 .paddr = 0, 344 .asid = 1, 345 .attr = 7, 346 .variable = false, 347 }, { 348 .vaddr = 0xd8000000, 349 .paddr = 0, 350 .asid = 1, 351 .attr = 3, 352 .variable = false, 353 } 354 }; 355 static const xtensa_tlb_entry way6[] = { 356 { 357 .vaddr = 0xe0000000, 358 .paddr = 0xf0000000, 359 .asid = 1, 360 .attr = 7, 361 .variable = false, 362 }, { 363 .vaddr = 0xf0000000, 364 .paddr = 0xf0000000, 365 .asid = 1, 366 .attr = 3, 367 .variable = false, 368 } 369 }; 370 memcpy(entry[5], way5, sizeof(way5)); 371 memcpy(entry[6], way6, sizeof(way6)); 372 } else { 373 uint32_t ei; 374 for (ei = 0; ei < 8; ++ei) { 375 entry[6][ei].vaddr = ei << 29; 376 entry[6][ei].paddr = ei << 29; 377 entry[6][ei].asid = 1; 378 entry[6][ei].attr = 3; 379 } 380 } 381} 382 383static void reset_tlb_region_way0(CPUXtensaState *env, 384 xtensa_tlb_entry entry[][MAX_TLB_WAY_SIZE]) 385{ 386 unsigned ei; 387 388 for (ei = 0; ei < 8; ++ei) { 389 entry[0][ei].vaddr = ei << 29; 390 entry[0][ei].paddr = ei << 29; 391 entry[0][ei].asid = 1; 392 entry[0][ei].attr = 2; 393 entry[0][ei].variable = true; 394 } 395} 396 397void reset_mmu(CPUXtensaState *env) 398{ 399 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 400 env->sregs[RASID] = 0x04030201; 401 env->sregs[ITLBCFG] = 0; 402 env->sregs[DTLBCFG] = 0; 403 env->autorefill_idx = 0; 404 reset_tlb_mmu_all_ways(env, &env->config->itlb, env->itlb); 405 reset_tlb_mmu_all_ways(env, &env->config->dtlb, env->dtlb); 406 reset_tlb_mmu_ways56(env, &env->config->itlb, env->itlb); 407 reset_tlb_mmu_ways56(env, &env->config->dtlb, env->dtlb); 408 } else if (xtensa_option_enabled(env->config, XTENSA_OPTION_MPU)) { 409 unsigned i; 410 411 env->sregs[MPUENB] = 0; 412 env->sregs[MPUCFG] = env->config->n_mpu_fg_segments; 413 env->sregs[CACHEADRDIS] = 0; 414 assert(env->config->n_mpu_bg_segments > 0 && 415 env->config->mpu_bg[0].vaddr == 0); 416 for (i = 1; i < env->config->n_mpu_bg_segments; ++i) { 417 assert(env->config->mpu_bg[i].vaddr >= 418 env->config->mpu_bg[i - 1].vaddr); 419 } 420 } else { 421 env->sregs[CACHEATTR] = 0x22222222; 422 reset_tlb_region_way0(env, env->itlb); 423 reset_tlb_region_way0(env, env->dtlb); 424 } 425} 426 427static unsigned get_ring(const CPUXtensaState *env, uint8_t asid) 428{ 429 unsigned i; 430 for (i = 0; i < 4; ++i) { 431 if (((env->sregs[RASID] >> i * 8) & 0xff) == asid) { 432 return i; 433 } 434 } 435 return 0xff; 436} 437 438/*! 439 * Lookup xtensa TLB for the given virtual address. 440 * See ISA, 4.6.2.2 441 * 442 * \param pwi: [out] way index 443 * \param pei: [out] entry index 444 * \param pring: [out] access ring 445 * \return 0 if ok, exception cause code otherwise 446 */ 447static int xtensa_tlb_lookup(const CPUXtensaState *env, 448 uint32_t addr, bool dtlb, 449 uint32_t *pwi, uint32_t *pei, uint8_t *pring) 450{ 451 const xtensa_tlb *tlb = dtlb ? 452 &env->config->dtlb : &env->config->itlb; 453 const xtensa_tlb_entry (*entry)[MAX_TLB_WAY_SIZE] = dtlb ? 454 env->dtlb : env->itlb; 455 456 int nhits = 0; 457 unsigned wi; 458 459 for (wi = 0; wi < tlb->nways; ++wi) { 460 uint32_t vpn; 461 uint32_t ei; 462 split_tlb_entry_spec_way(env, addr, dtlb, &vpn, wi, &ei); 463 if (entry[wi][ei].vaddr == vpn && entry[wi][ei].asid) { 464 unsigned ring = get_ring(env, entry[wi][ei].asid); 465 if (ring < 4) { 466 if (++nhits > 1) { 467 return dtlb ? 468 LOAD_STORE_TLB_MULTI_HIT_CAUSE : 469 INST_TLB_MULTI_HIT_CAUSE; 470 } 471 *pwi = wi; 472 *pei = ei; 473 *pring = ring; 474 } 475 } 476 } 477 return nhits ? 0 : 478 (dtlb ? LOAD_STORE_TLB_MISS_CAUSE : INST_TLB_MISS_CAUSE); 479} 480 481uint32_t HELPER(rtlb0)(CPUXtensaState *env, uint32_t v, uint32_t dtlb) 482{ 483 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 484 uint32_t wi; 485 const xtensa_tlb_entry *entry = get_tlb_entry(env, v, dtlb, &wi); 486 return (entry->vaddr & get_vpn_mask(env, dtlb, wi)) | entry->asid; 487 } else { 488 return v & REGION_PAGE_MASK; 489 } 490} 491 492uint32_t HELPER(rtlb1)(CPUXtensaState *env, uint32_t v, uint32_t dtlb) 493{ 494 const xtensa_tlb_entry *entry = get_tlb_entry(env, v, dtlb, NULL); 495 return entry->paddr | entry->attr; 496} 497 498void HELPER(itlb)(CPUXtensaState *env, uint32_t v, uint32_t dtlb) 499{ 500 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 501 uint32_t wi; 502 xtensa_tlb_entry *entry = get_tlb_entry(env, v, dtlb, &wi); 503 if (entry->variable && entry->asid) { 504 tlb_flush_page(env_cpu(env), entry->vaddr); 505 entry->asid = 0; 506 } 507 } 508} 509 510uint32_t HELPER(ptlb)(CPUXtensaState *env, uint32_t v, uint32_t dtlb) 511{ 512 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 513 uint32_t wi; 514 uint32_t ei; 515 uint8_t ring; 516 int res = xtensa_tlb_lookup(env, v, dtlb, &wi, &ei, &ring); 517 518 switch (res) { 519 case 0: 520 if (ring >= xtensa_get_ring(env)) { 521 return (v & 0xfffff000) | wi | (dtlb ? 0x10 : 0x8); 522 } 523 break; 524 525 case INST_TLB_MULTI_HIT_CAUSE: 526 case LOAD_STORE_TLB_MULTI_HIT_CAUSE: 527 HELPER(exception_cause_vaddr)(env, env->pc, res, v); 528 break; 529 } 530 return 0; 531 } else { 532 return (v & REGION_PAGE_MASK) | 0x1; 533 } 534} 535 536void HELPER(wtlb)(CPUXtensaState *env, uint32_t p, uint32_t v, uint32_t dtlb) 537{ 538 uint32_t vpn; 539 uint32_t wi; 540 uint32_t ei; 541 split_tlb_entry_spec(env, v, dtlb, &vpn, &wi, &ei); 542 xtensa_tlb_set_entry(env, dtlb, wi, ei, vpn, p); 543} 544 545/*! 546 * Convert MMU ATTR to PAGE_{READ,WRITE,EXEC} mask. 547 * See ISA, 4.6.5.10 548 */ 549static unsigned mmu_attr_to_access(uint32_t attr) 550{ 551 unsigned access = 0; 552 553 if (attr < 12) { 554 access |= PAGE_READ; 555 if (attr & 0x1) { 556 access |= PAGE_EXEC; 557 } 558 if (attr & 0x2) { 559 access |= PAGE_WRITE; 560 } 561 562 switch (attr & 0xc) { 563 case 0: 564 access |= PAGE_CACHE_BYPASS; 565 break; 566 567 case 4: 568 access |= PAGE_CACHE_WB; 569 break; 570 571 case 8: 572 access |= PAGE_CACHE_WT; 573 break; 574 } 575 } else if (attr == 13) { 576 access |= PAGE_READ | PAGE_WRITE | PAGE_CACHE_ISOLATE; 577 } 578 return access; 579} 580 581/*! 582 * Convert region protection ATTR to PAGE_{READ,WRITE,EXEC} mask. 583 * See ISA, 4.6.3.3 584 */ 585static unsigned region_attr_to_access(uint32_t attr) 586{ 587 static const unsigned access[16] = { 588 [0] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_WT, 589 [1] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WT, 590 [2] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_BYPASS, 591 [3] = PAGE_EXEC | PAGE_CACHE_WB, 592 [4] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WB, 593 [5] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WB, 594 [14] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_ISOLATE, 595 }; 596 597 return access[attr & 0xf]; 598} 599 600/*! 601 * Convert cacheattr to PAGE_{READ,WRITE,EXEC} mask. 602 * See ISA, A.2.14 The Cache Attribute Register 603 */ 604static unsigned cacheattr_attr_to_access(uint32_t attr) 605{ 606 static const unsigned access[16] = { 607 [0] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_WT, 608 [1] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WT, 609 [2] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_BYPASS, 610 [3] = PAGE_EXEC | PAGE_CACHE_WB, 611 [4] = PAGE_READ | PAGE_WRITE | PAGE_EXEC | PAGE_CACHE_WB, 612 [14] = PAGE_READ | PAGE_WRITE | PAGE_CACHE_ISOLATE, 613 }; 614 615 return access[attr & 0xf]; 616} 617 618struct attr_pattern { 619 uint32_t mask; 620 uint32_t value; 621}; 622 623static int attr_pattern_match(uint32_t attr, 624 const struct attr_pattern *pattern, 625 size_t n) 626{ 627 size_t i; 628 629 for (i = 0; i < n; ++i) { 630 if ((attr & pattern[i].mask) == pattern[i].value) { 631 return 1; 632 } 633 } 634 return 0; 635} 636 637static unsigned mpu_attr_to_cpu_cache(uint32_t attr) 638{ 639 static const struct attr_pattern cpu_c[] = { 640 { .mask = 0x18f, .value = 0x089 }, 641 { .mask = 0x188, .value = 0x080 }, 642 { .mask = 0x180, .value = 0x180 }, 643 }; 644 645 unsigned type = 0; 646 647 if (attr_pattern_match(attr, cpu_c, ARRAY_SIZE(cpu_c))) { 648 type |= XTENSA_MPU_TYPE_CPU_CACHE; 649 if (attr & 0x10) { 650 type |= XTENSA_MPU_TYPE_CPU_C; 651 } 652 if (attr & 0x20) { 653 type |= XTENSA_MPU_TYPE_CPU_W; 654 } 655 if (attr & 0x40) { 656 type |= XTENSA_MPU_TYPE_CPU_R; 657 } 658 } 659 return type; 660} 661 662static unsigned mpu_attr_to_type(uint32_t attr) 663{ 664 static const struct attr_pattern device_type[] = { 665 { .mask = 0x1f6, .value = 0x000 }, 666 { .mask = 0x1f6, .value = 0x006 }, 667 }; 668 static const struct attr_pattern sys_nc_type[] = { 669 { .mask = 0x1fe, .value = 0x018 }, 670 { .mask = 0x1fe, .value = 0x01e }, 671 { .mask = 0x18f, .value = 0x089 }, 672 }; 673 static const struct attr_pattern sys_c_type[] = { 674 { .mask = 0x1f8, .value = 0x010 }, 675 { .mask = 0x188, .value = 0x080 }, 676 { .mask = 0x1f0, .value = 0x030 }, 677 { .mask = 0x180, .value = 0x180 }, 678 }; 679 static const struct attr_pattern b[] = { 680 { .mask = 0x1f7, .value = 0x001 }, 681 { .mask = 0x1f7, .value = 0x007 }, 682 { .mask = 0x1ff, .value = 0x019 }, 683 { .mask = 0x1ff, .value = 0x01f }, 684 }; 685 686 unsigned type = 0; 687 688 attr = (attr & XTENSA_MPU_MEM_TYPE_MASK) >> XTENSA_MPU_MEM_TYPE_SHIFT; 689 if (attr_pattern_match(attr, device_type, ARRAY_SIZE(device_type))) { 690 type |= XTENSA_MPU_SYSTEM_TYPE_DEVICE; 691 if (attr & 0x80) { 692 type |= XTENSA_MPU_TYPE_INT; 693 } 694 } 695 if (attr_pattern_match(attr, sys_nc_type, ARRAY_SIZE(sys_nc_type))) { 696 type |= XTENSA_MPU_SYSTEM_TYPE_NC; 697 } 698 if (attr_pattern_match(attr, sys_c_type, ARRAY_SIZE(sys_c_type))) { 699 type |= XTENSA_MPU_SYSTEM_TYPE_C; 700 if (attr & 0x1) { 701 type |= XTENSA_MPU_TYPE_SYS_C; 702 } 703 if (attr & 0x2) { 704 type |= XTENSA_MPU_TYPE_SYS_W; 705 } 706 if (attr & 0x4) { 707 type |= XTENSA_MPU_TYPE_SYS_R; 708 } 709 } 710 if (attr_pattern_match(attr, b, ARRAY_SIZE(b))) { 711 type |= XTENSA_MPU_TYPE_B; 712 } 713 type |= mpu_attr_to_cpu_cache(attr); 714 715 return type; 716} 717 718static unsigned mpu_attr_to_access(uint32_t attr, unsigned ring) 719{ 720 static const unsigned access[2][16] = { 721 [0] = { 722 [4] = PAGE_READ, 723 [5] = PAGE_READ | PAGE_EXEC, 724 [6] = PAGE_READ | PAGE_WRITE, 725 [7] = PAGE_READ | PAGE_WRITE | PAGE_EXEC, 726 [8] = PAGE_WRITE, 727 [9] = PAGE_READ | PAGE_WRITE, 728 [10] = PAGE_READ | PAGE_WRITE, 729 [11] = PAGE_READ | PAGE_WRITE | PAGE_EXEC, 730 [12] = PAGE_READ, 731 [13] = PAGE_READ | PAGE_EXEC, 732 [14] = PAGE_READ | PAGE_WRITE, 733 [15] = PAGE_READ | PAGE_WRITE | PAGE_EXEC, 734 }, 735 [1] = { 736 [8] = PAGE_WRITE, 737 [9] = PAGE_READ | PAGE_WRITE | PAGE_EXEC, 738 [10] = PAGE_READ, 739 [11] = PAGE_READ | PAGE_EXEC, 740 [12] = PAGE_READ, 741 [13] = PAGE_READ | PAGE_EXEC, 742 [14] = PAGE_READ | PAGE_WRITE, 743 [15] = PAGE_READ | PAGE_WRITE | PAGE_EXEC, 744 }, 745 }; 746 unsigned rv; 747 unsigned type; 748 749 type = mpu_attr_to_cpu_cache(attr); 750 rv = access[ring != 0][(attr & XTENSA_MPU_ACC_RIGHTS_MASK) >> 751 XTENSA_MPU_ACC_RIGHTS_SHIFT]; 752 753 if (type & XTENSA_MPU_TYPE_CPU_CACHE) { 754 rv |= (type & XTENSA_MPU_TYPE_CPU_C) ? PAGE_CACHE_WB : PAGE_CACHE_WT; 755 } else { 756 rv |= PAGE_CACHE_BYPASS; 757 } 758 return rv; 759} 760 761static bool is_access_granted(unsigned access, int is_write) 762{ 763 switch (is_write) { 764 case 0: 765 return access & PAGE_READ; 766 767 case 1: 768 return access & PAGE_WRITE; 769 770 case 2: 771 return access & PAGE_EXEC; 772 773 default: 774 return 0; 775 } 776} 777 778static bool get_pte(CPUXtensaState *env, uint32_t vaddr, uint32_t *pte); 779 780static int get_physical_addr_mmu(CPUXtensaState *env, bool update_tlb, 781 uint32_t vaddr, int is_write, int mmu_idx, 782 uint32_t *paddr, uint32_t *page_size, 783 unsigned *access, bool may_lookup_pt) 784{ 785 bool dtlb = is_write != 2; 786 uint32_t wi; 787 uint32_t ei; 788 uint8_t ring; 789 uint32_t vpn; 790 uint32_t pte; 791 const xtensa_tlb_entry *entry = NULL; 792 xtensa_tlb_entry tmp_entry; 793 int ret = xtensa_tlb_lookup(env, vaddr, dtlb, &wi, &ei, &ring); 794 795 if ((ret == INST_TLB_MISS_CAUSE || ret == LOAD_STORE_TLB_MISS_CAUSE) && 796 may_lookup_pt && get_pte(env, vaddr, &pte)) { 797 ring = (pte >> 4) & 0x3; 798 wi = 0; 799 split_tlb_entry_spec_way(env, vaddr, dtlb, &vpn, wi, &ei); 800 801 if (update_tlb) { 802 wi = ++env->autorefill_idx & 0x3; 803 xtensa_tlb_set_entry(env, dtlb, wi, ei, vpn, pte); 804 env->sregs[EXCVADDR] = vaddr; 805 qemu_log_mask(CPU_LOG_MMU, "%s: autorefill(%08x): %08x -> %08x\n", 806 __func__, vaddr, vpn, pte); 807 } else { 808 xtensa_tlb_set_entry_mmu(env, &tmp_entry, dtlb, wi, ei, vpn, pte); 809 entry = &tmp_entry; 810 } 811 ret = 0; 812 } 813 if (ret != 0) { 814 return ret; 815 } 816 817 if (entry == NULL) { 818 entry = xtensa_tlb_get_entry(env, dtlb, wi, ei); 819 } 820 821 if (ring < mmu_idx) { 822 return dtlb ? 823 LOAD_STORE_PRIVILEGE_CAUSE : 824 INST_FETCH_PRIVILEGE_CAUSE; 825 } 826 827 *access = mmu_attr_to_access(entry->attr) & 828 ~(dtlb ? PAGE_EXEC : PAGE_READ | PAGE_WRITE); 829 if (!is_access_granted(*access, is_write)) { 830 return dtlb ? 831 (is_write ? 832 STORE_PROHIBITED_CAUSE : 833 LOAD_PROHIBITED_CAUSE) : 834 INST_FETCH_PROHIBITED_CAUSE; 835 } 836 837 *paddr = entry->paddr | (vaddr & ~xtensa_tlb_get_addr_mask(env, dtlb, wi)); 838 *page_size = ~xtensa_tlb_get_addr_mask(env, dtlb, wi) + 1; 839 840 return 0; 841} 842 843static bool get_pte(CPUXtensaState *env, uint32_t vaddr, uint32_t *pte) 844{ 845 CPUState *cs = env_cpu(env); 846 uint32_t paddr; 847 uint32_t page_size; 848 unsigned access; 849 uint32_t pt_vaddr = 850 (env->sregs[PTEVADDR] | (vaddr >> 10)) & 0xfffffffc; 851 int ret = get_physical_addr_mmu(env, false, pt_vaddr, 0, 0, 852 &paddr, &page_size, &access, false); 853 854 if (ret == 0) { 855 qemu_log_mask(CPU_LOG_MMU, 856 "%s: autorefill(%08x): PTE va = %08x, pa = %08x\n", 857 __func__, vaddr, pt_vaddr, paddr); 858 } else { 859 qemu_log_mask(CPU_LOG_MMU, 860 "%s: autorefill(%08x): PTE va = %08x, failed (%d)\n", 861 __func__, vaddr, pt_vaddr, ret); 862 } 863 864 if (ret == 0) { 865 MemTxResult result; 866 867 *pte = address_space_ldl(cs->as, paddr, MEMTXATTRS_UNSPECIFIED, 868 &result); 869 if (result != MEMTX_OK) { 870 qemu_log_mask(CPU_LOG_MMU, 871 "%s: couldn't load PTE: transaction failed (%u)\n", 872 __func__, (unsigned)result); 873 ret = 1; 874 } 875 } 876 return ret == 0; 877} 878 879static int get_physical_addr_region(CPUXtensaState *env, 880 uint32_t vaddr, int is_write, int mmu_idx, 881 uint32_t *paddr, uint32_t *page_size, 882 unsigned *access) 883{ 884 bool dtlb = is_write != 2; 885 uint32_t wi = 0; 886 uint32_t ei = (vaddr >> 29) & 0x7; 887 const xtensa_tlb_entry *entry = 888 xtensa_tlb_get_entry(env, dtlb, wi, ei); 889 890 *access = region_attr_to_access(entry->attr); 891 if (!is_access_granted(*access, is_write)) { 892 return dtlb ? 893 (is_write ? 894 STORE_PROHIBITED_CAUSE : 895 LOAD_PROHIBITED_CAUSE) : 896 INST_FETCH_PROHIBITED_CAUSE; 897 } 898 899 *paddr = entry->paddr | (vaddr & ~REGION_PAGE_MASK); 900 *page_size = ~REGION_PAGE_MASK + 1; 901 902 return 0; 903} 904 905static int xtensa_mpu_lookup(const xtensa_mpu_entry *entry, unsigned n, 906 uint32_t vaddr, unsigned *segment) 907{ 908 unsigned nhits = 0; 909 unsigned i; 910 911 for (i = 0; i < n; ++i) { 912 if (vaddr >= entry[i].vaddr && 913 (i == n - 1 || vaddr < entry[i + 1].vaddr)) { 914 if (nhits++) { 915 break; 916 } 917 *segment = i; 918 } 919 } 920 return nhits; 921} 922 923void HELPER(wsr_mpuenb)(CPUXtensaState *env, uint32_t v) 924{ 925 v &= (2u << (env->config->n_mpu_fg_segments - 1)) - 1; 926 927 if (v != env->sregs[MPUENB]) { 928 env->sregs[MPUENB] = v; 929 tlb_flush(env_cpu(env)); 930 } 931} 932 933void HELPER(wptlb)(CPUXtensaState *env, uint32_t p, uint32_t v) 934{ 935 unsigned segment = p & XTENSA_MPU_SEGMENT_MASK; 936 937 if (segment < env->config->n_mpu_fg_segments) { 938 env->mpu_fg[segment].vaddr = v & -env->config->mpu_align; 939 env->mpu_fg[segment].attr = p & XTENSA_MPU_ATTR_MASK; 940 env->sregs[MPUENB] = deposit32(env->sregs[MPUENB], segment, 1, v); 941 tlb_flush(env_cpu(env)); 942 } 943} 944 945uint32_t HELPER(rptlb0)(CPUXtensaState *env, uint32_t s) 946{ 947 unsigned segment = s & XTENSA_MPU_SEGMENT_MASK; 948 949 if (segment < env->config->n_mpu_fg_segments) { 950 return env->mpu_fg[segment].vaddr | 951 extract32(env->sregs[MPUENB], segment, 1); 952 } else { 953 return 0; 954 } 955} 956 957uint32_t HELPER(rptlb1)(CPUXtensaState *env, uint32_t s) 958{ 959 unsigned segment = s & XTENSA_MPU_SEGMENT_MASK; 960 961 if (segment < env->config->n_mpu_fg_segments) { 962 return env->mpu_fg[segment].attr; 963 } else { 964 return 0; 965 } 966} 967 968uint32_t HELPER(pptlb)(CPUXtensaState *env, uint32_t v) 969{ 970 unsigned nhits; 971 unsigned segment = XTENSA_MPU_PROBE_B; 972 unsigned bg_segment; 973 974 nhits = xtensa_mpu_lookup(env->mpu_fg, env->config->n_mpu_fg_segments, 975 v, &segment); 976 if (nhits > 1) { 977 HELPER(exception_cause_vaddr)(env, env->pc, 978 LOAD_STORE_TLB_MULTI_HIT_CAUSE, v); 979 } else if (nhits == 1 && (env->sregs[MPUENB] & (1u << segment))) { 980 return env->mpu_fg[segment].attr | segment | XTENSA_MPU_PROBE_V; 981 } else { 982 xtensa_mpu_lookup(env->config->mpu_bg, 983 env->config->n_mpu_bg_segments, 984 v, &bg_segment); 985 return env->config->mpu_bg[bg_segment].attr | segment; 986 } 987} 988 989static int get_physical_addr_mpu(CPUXtensaState *env, 990 uint32_t vaddr, int is_write, int mmu_idx, 991 uint32_t *paddr, uint32_t *page_size, 992 unsigned *access) 993{ 994 unsigned nhits; 995 unsigned segment; 996 uint32_t attr; 997 998 nhits = xtensa_mpu_lookup(env->mpu_fg, env->config->n_mpu_fg_segments, 999 vaddr, &segment); 1000 if (nhits > 1) { 1001 return is_write < 2 ? 1002 LOAD_STORE_TLB_MULTI_HIT_CAUSE : 1003 INST_TLB_MULTI_HIT_CAUSE; 1004 } else if (nhits == 1 && (env->sregs[MPUENB] & (1u << segment))) { 1005 attr = env->mpu_fg[segment].attr; 1006 } else { 1007 xtensa_mpu_lookup(env->config->mpu_bg, 1008 env->config->n_mpu_bg_segments, 1009 vaddr, &segment); 1010 attr = env->config->mpu_bg[segment].attr; 1011 } 1012 1013 *access = mpu_attr_to_access(attr, mmu_idx); 1014 if (!is_access_granted(*access, is_write)) { 1015 return is_write < 2 ? 1016 (is_write ? 1017 STORE_PROHIBITED_CAUSE : 1018 LOAD_PROHIBITED_CAUSE) : 1019 INST_FETCH_PROHIBITED_CAUSE; 1020 } 1021 *paddr = vaddr; 1022 *page_size = env->config->mpu_align; 1023 return 0; 1024} 1025 1026/*! 1027 * Convert virtual address to physical addr. 1028 * MMU may issue pagewalk and change xtensa autorefill TLB way entry. 1029 * 1030 * \return 0 if ok, exception cause code otherwise 1031 */ 1032int xtensa_get_physical_addr(CPUXtensaState *env, bool update_tlb, 1033 uint32_t vaddr, int is_write, int mmu_idx, 1034 uint32_t *paddr, uint32_t *page_size, 1035 unsigned *access) 1036{ 1037 if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) { 1038 return get_physical_addr_mmu(env, update_tlb, 1039 vaddr, is_write, mmu_idx, paddr, 1040 page_size, access, true); 1041 } else if (xtensa_option_bits_enabled(env->config, 1042 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_PROTECTION) | 1043 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_TRANSLATION))) { 1044 return get_physical_addr_region(env, vaddr, is_write, mmu_idx, 1045 paddr, page_size, access); 1046 } else if (xtensa_option_enabled(env->config, XTENSA_OPTION_MPU)) { 1047 return get_physical_addr_mpu(env, vaddr, is_write, mmu_idx, 1048 paddr, page_size, access); 1049 } else { 1050 *paddr = vaddr; 1051 *page_size = TARGET_PAGE_SIZE; 1052 *access = cacheattr_attr_to_access(env->sregs[CACHEATTR] >> 1053 ((vaddr & 0xe0000000) >> 27)); 1054 return 0; 1055 } 1056} 1057 1058static void dump_tlb(CPUXtensaState *env, bool dtlb) 1059{ 1060 unsigned wi, ei; 1061 const xtensa_tlb *conf = 1062 dtlb ? &env->config->dtlb : &env->config->itlb; 1063 unsigned (*attr_to_access)(uint32_t) = 1064 xtensa_option_enabled(env->config, XTENSA_OPTION_MMU) ? 1065 mmu_attr_to_access : region_attr_to_access; 1066 1067 for (wi = 0; wi < conf->nways; ++wi) { 1068 uint32_t sz = ~xtensa_tlb_get_addr_mask(env, dtlb, wi) + 1; 1069 const char *sz_text; 1070 bool print_header = true; 1071 1072 if (sz >= 0x100000) { 1073 sz /= MiB; 1074 sz_text = "MB"; 1075 } else { 1076 sz /= KiB; 1077 sz_text = "KB"; 1078 } 1079 1080 for (ei = 0; ei < conf->way_size[wi]; ++ei) { 1081 const xtensa_tlb_entry *entry = 1082 xtensa_tlb_get_entry(env, dtlb, wi, ei); 1083 1084 if (entry->asid) { 1085 static const char * const cache_text[8] = { 1086 [PAGE_CACHE_BYPASS >> PAGE_CACHE_SHIFT] = "Bypass", 1087 [PAGE_CACHE_WT >> PAGE_CACHE_SHIFT] = "WT", 1088 [PAGE_CACHE_WB >> PAGE_CACHE_SHIFT] = "WB", 1089 [PAGE_CACHE_ISOLATE >> PAGE_CACHE_SHIFT] = "Isolate", 1090 }; 1091 unsigned access = attr_to_access(entry->attr); 1092 unsigned cache_idx = (access & PAGE_CACHE_MASK) >> 1093 PAGE_CACHE_SHIFT; 1094 1095 if (print_header) { 1096 print_header = false; 1097 qemu_printf("Way %u (%d %s)\n", wi, sz, sz_text); 1098 qemu_printf("\tVaddr Paddr ASID Attr RWX Cache\n" 1099 "\t---------- ---------- ---- ---- --- -------\n"); 1100 } 1101 qemu_printf("\t0x%08x 0x%08x 0x%02x 0x%02x %c%c%c %-7s\n", 1102 entry->vaddr, 1103 entry->paddr, 1104 entry->asid, 1105 entry->attr, 1106 (access & PAGE_READ) ? 'R' : '-', 1107 (access & PAGE_WRITE) ? 'W' : '-', 1108 (access & PAGE_EXEC) ? 'X' : '-', 1109 cache_text[cache_idx] ? 1110 cache_text[cache_idx] : "Invalid"); 1111 } 1112 } 1113 } 1114} 1115 1116static void dump_mpu(CPUXtensaState *env, 1117 const xtensa_mpu_entry *entry, unsigned n) 1118{ 1119 unsigned i; 1120 1121 qemu_printf("\t%s Vaddr Attr Ring0 Ring1 System Type CPU cache\n" 1122 "\t%s ---------- ---------- ----- ----- ------------- ---------\n", 1123 env ? "En" : " ", 1124 env ? "--" : " "); 1125 1126 for (i = 0; i < n; ++i) { 1127 uint32_t attr = entry[i].attr; 1128 unsigned access0 = mpu_attr_to_access(attr, 0); 1129 unsigned access1 = mpu_attr_to_access(attr, 1); 1130 unsigned type = mpu_attr_to_type(attr); 1131 char cpu_cache = (type & XTENSA_MPU_TYPE_CPU_CACHE) ? '-' : ' '; 1132 1133 qemu_printf("\t %c 0x%08x 0x%08x %c%c%c %c%c%c ", 1134 env ? 1135 ((env->sregs[MPUENB] & (1u << i)) ? '+' : '-') : ' ', 1136 entry[i].vaddr, attr, 1137 (access0 & PAGE_READ) ? 'R' : '-', 1138 (access0 & PAGE_WRITE) ? 'W' : '-', 1139 (access0 & PAGE_EXEC) ? 'X' : '-', 1140 (access1 & PAGE_READ) ? 'R' : '-', 1141 (access1 & PAGE_WRITE) ? 'W' : '-', 1142 (access1 & PAGE_EXEC) ? 'X' : '-'); 1143 1144 switch (type & XTENSA_MPU_SYSTEM_TYPE_MASK) { 1145 case XTENSA_MPU_SYSTEM_TYPE_DEVICE: 1146 qemu_printf("Device %cB %3s\n", 1147 (type & XTENSA_MPU_TYPE_B) ? ' ' : 'n', 1148 (type & XTENSA_MPU_TYPE_INT) ? "int" : ""); 1149 break; 1150 case XTENSA_MPU_SYSTEM_TYPE_NC: 1151 qemu_printf("Sys NC %cB %c%c%c\n", 1152 (type & XTENSA_MPU_TYPE_B) ? ' ' : 'n', 1153 (type & XTENSA_MPU_TYPE_CPU_R) ? 'r' : cpu_cache, 1154 (type & XTENSA_MPU_TYPE_CPU_W) ? 'w' : cpu_cache, 1155 (type & XTENSA_MPU_TYPE_CPU_C) ? 'c' : cpu_cache); 1156 break; 1157 case XTENSA_MPU_SYSTEM_TYPE_C: 1158 qemu_printf("Sys C %c%c%c %c%c%c\n", 1159 (type & XTENSA_MPU_TYPE_SYS_R) ? 'R' : '-', 1160 (type & XTENSA_MPU_TYPE_SYS_W) ? 'W' : '-', 1161 (type & XTENSA_MPU_TYPE_SYS_C) ? 'C' : '-', 1162 (type & XTENSA_MPU_TYPE_CPU_R) ? 'r' : cpu_cache, 1163 (type & XTENSA_MPU_TYPE_CPU_W) ? 'w' : cpu_cache, 1164 (type & XTENSA_MPU_TYPE_CPU_C) ? 'c' : cpu_cache); 1165 break; 1166 default: 1167 qemu_printf("Unknown\n"); 1168 break; 1169 } 1170 } 1171} 1172 1173void dump_mmu(CPUXtensaState *env) 1174{ 1175 if (xtensa_option_bits_enabled(env->config, 1176 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_PROTECTION) | 1177 XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_TRANSLATION) | 1178 XTENSA_OPTION_BIT(XTENSA_OPTION_MMU))) { 1179 1180 qemu_printf("ITLB:\n"); 1181 dump_tlb(env, false); 1182 qemu_printf("\nDTLB:\n"); 1183 dump_tlb(env, true); 1184 } else if (xtensa_option_enabled(env->config, XTENSA_OPTION_MPU)) { 1185 qemu_printf("Foreground map:\n"); 1186 dump_mpu(env, env->mpu_fg, env->config->n_mpu_fg_segments); 1187 qemu_printf("\nBackground map:\n"); 1188 dump_mpu(NULL, env->config->mpu_bg, env->config->n_mpu_bg_segments); 1189 } else { 1190 qemu_printf("No TLB for this CPU core\n"); 1191 } 1192}