ev5.cc revision 4172
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 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 7 * met: 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 copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Steve Reinhardt 29 * Nathan Binkert 30 */ 31 32#include "arch/alpha/faults.hh" 33#include "arch/alpha/isa_traits.hh" 34#include "arch/alpha/kernel_stats.hh" 35#include "arch/alpha/osfpal.hh" 36#include "arch/alpha/tlb.hh" 37#include "arch/alpha/kgdb.h" 38#include "base/remote_gdb.hh" 39#include "base/stats/events.hh" 40#include "config/full_system.hh" 41#include "cpu/base.hh" 42#include "cpu/simple_thread.hh" 43#include "cpu/thread_context.hh" 44#include "sim/debug.hh" 45#include "sim/sim_exit.hh" 46 47#if FULL_SYSTEM 48 49using namespace EV5; 50 51//////////////////////////////////////////////////////////////////////// 52// 53// Machine dependent functions 54// 55void 56AlphaISA::initCPU(ThreadContext *tc, int cpuId) 57{ 58 initIPRs(tc, cpuId); 59 60 tc->setIntReg(16, cpuId); 61 tc->setIntReg(0, cpuId); 62 63 AlphaISA::AlphaFault *reset = new AlphaISA::ResetFault; 64 65 tc->setPC(tc->readMiscRegNoEffect(IPR_PAL_BASE) + reset->vect()); 66 tc->setNextPC(tc->readPC() + sizeof(MachInst)); 67 68 delete reset; 69} 70 71//////////////////////////////////////////////////////////////////////// 72// 73// 74// 75void 76AlphaISA::initIPRs(ThreadContext *tc, int cpuId) 77{ 78 for (int i = 0; i < NumInternalProcRegs; ++i) { 79 tc->setMiscRegNoEffect(i, 0); 80 } 81 82 tc->setMiscRegNoEffect(IPR_PAL_BASE, PalBase); 83 tc->setMiscRegNoEffect(IPR_MCSR, 0x6); 84 tc->setMiscRegNoEffect(IPR_PALtemp16, cpuId); 85} 86 87 88template <class CPU> 89void 90AlphaISA::processInterrupts(CPU *cpu) 91{ 92 //Check if there are any outstanding interrupts 93 //Handle the interrupts 94 int ipl = 0; 95 int summary = 0; 96 97 if (cpu->readMiscRegNoEffect(IPR_ASTRR)) 98 panic("asynchronous traps not implemented\n"); 99 100 if (cpu->readMiscRegNoEffect(IPR_SIRR)) { 101 for (int i = INTLEVEL_SOFTWARE_MIN; 102 i < INTLEVEL_SOFTWARE_MAX; i++) { 103 if (cpu->readMiscRegNoEffect(IPR_SIRR) & (ULL(1) << i)) { 104 // See table 4-19 of the 21164 hardware reference 105 ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1; 106 summary |= (ULL(1) << i); 107 } 108 } 109 } 110 111 uint64_t interrupts = cpu->intr_status(); 112 113 if (interrupts) { 114 for (int i = INTLEVEL_EXTERNAL_MIN; 115 i < INTLEVEL_EXTERNAL_MAX; i++) { 116 if (interrupts & (ULL(1) << i)) { 117 // See table 4-19 of the 21164 hardware reference 118 ipl = i; 119 summary |= (ULL(1) << i); 120 } 121 } 122 } 123 124 if (ipl && ipl > cpu->readMiscRegNoEffect(IPR_IPLR)) { 125 cpu->setMiscRegNoEffect(IPR_ISR, summary); 126 cpu->setMiscRegNoEffect(IPR_INTID, ipl); 127 cpu->trap(new InterruptFault); 128 DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n", 129 cpu->readMiscRegNoEffect(IPR_IPLR), ipl, summary); 130 } 131 132} 133 134template <class CPU> 135void 136AlphaISA::zeroRegisters(CPU *cpu) 137{ 138 // Insure ISA semantics 139 // (no longer very clean due to the change in setIntReg() in the 140 // cpu model. Consider changing later.) 141 cpu->thread->setIntReg(ZeroReg, 0); 142 cpu->thread->setFloatReg(ZeroReg, 0.0); 143} 144 145Fault 146SimpleThread::hwrei() 147{ 148 if (!(readPC() & 0x3)) 149 return new UnimplementedOpcodeFault; 150 151 setNextPC(readMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR)); 152 153 if (!misspeculating()) { 154 if (kernelStats) 155 kernelStats->hwrei(); 156 } 157 158 // FIXME: XXX check for interrupts? XXX 159 return NoFault; 160} 161 162int 163AlphaISA::MiscRegFile::getInstAsid() 164{ 165 return EV5::ITB_ASN_ASN(ipr[IPR_ITB_ASN]); 166} 167 168int 169AlphaISA::MiscRegFile::getDataAsid() 170{ 171 return EV5::DTB_ASN_ASN(ipr[IPR_DTB_ASN]); 172} 173 174AlphaISA::MiscReg 175AlphaISA::MiscRegFile::readIpr(int idx, ThreadContext *tc) 176{ 177 uint64_t retval = 0; // return value, default 0 178 179 switch (idx) { 180 case AlphaISA::IPR_PALtemp0: 181 case AlphaISA::IPR_PALtemp1: 182 case AlphaISA::IPR_PALtemp2: 183 case AlphaISA::IPR_PALtemp3: 184 case AlphaISA::IPR_PALtemp4: 185 case AlphaISA::IPR_PALtemp5: 186 case AlphaISA::IPR_PALtemp6: 187 case AlphaISA::IPR_PALtemp7: 188 case AlphaISA::IPR_PALtemp8: 189 case AlphaISA::IPR_PALtemp9: 190 case AlphaISA::IPR_PALtemp10: 191 case AlphaISA::IPR_PALtemp11: 192 case AlphaISA::IPR_PALtemp12: 193 case AlphaISA::IPR_PALtemp13: 194 case AlphaISA::IPR_PALtemp14: 195 case AlphaISA::IPR_PALtemp15: 196 case AlphaISA::IPR_PALtemp16: 197 case AlphaISA::IPR_PALtemp17: 198 case AlphaISA::IPR_PALtemp18: 199 case AlphaISA::IPR_PALtemp19: 200 case AlphaISA::IPR_PALtemp20: 201 case AlphaISA::IPR_PALtemp21: 202 case AlphaISA::IPR_PALtemp22: 203 case AlphaISA::IPR_PALtemp23: 204 case AlphaISA::IPR_PAL_BASE: 205 206 case AlphaISA::IPR_IVPTBR: 207 case AlphaISA::IPR_DC_MODE: 208 case AlphaISA::IPR_MAF_MODE: 209 case AlphaISA::IPR_ISR: 210 case AlphaISA::IPR_EXC_ADDR: 211 case AlphaISA::IPR_IC_PERR_STAT: 212 case AlphaISA::IPR_DC_PERR_STAT: 213 case AlphaISA::IPR_MCSR: 214 case AlphaISA::IPR_ASTRR: 215 case AlphaISA::IPR_ASTER: 216 case AlphaISA::IPR_SIRR: 217 case AlphaISA::IPR_ICSR: 218 case AlphaISA::IPR_ICM: 219 case AlphaISA::IPR_DTB_CM: 220 case AlphaISA::IPR_IPLR: 221 case AlphaISA::IPR_INTID: 222 case AlphaISA::IPR_PMCTR: 223 // no side-effect 224 retval = ipr[idx]; 225 break; 226 227 case AlphaISA::IPR_CC: 228 retval |= ipr[idx] & ULL(0xffffffff00000000); 229 retval |= tc->getCpuPtr()->curCycle() & ULL(0x00000000ffffffff); 230 break; 231 232 case AlphaISA::IPR_VA: 233 retval = ipr[idx]; 234 break; 235 236 case AlphaISA::IPR_VA_FORM: 237 case AlphaISA::IPR_MM_STAT: 238 case AlphaISA::IPR_IFAULT_VA_FORM: 239 case AlphaISA::IPR_EXC_MASK: 240 case AlphaISA::IPR_EXC_SUM: 241 retval = ipr[idx]; 242 break; 243 244 case AlphaISA::IPR_DTB_PTE: 245 { 246 AlphaISA::PTE &pte = tc->getDTBPtr()->index(!tc->misspeculating()); 247 248 retval |= ((u_int64_t)pte.ppn & ULL(0x7ffffff)) << 32; 249 retval |= ((u_int64_t)pte.xre & ULL(0xf)) << 8; 250 retval |= ((u_int64_t)pte.xwe & ULL(0xf)) << 12; 251 retval |= ((u_int64_t)pte.fonr & ULL(0x1)) << 1; 252 retval |= ((u_int64_t)pte.fonw & ULL(0x1))<< 2; 253 retval |= ((u_int64_t)pte.asma & ULL(0x1)) << 4; 254 retval |= ((u_int64_t)pte.asn & ULL(0x7f)) << 57; 255 } 256 break; 257 258 // write only registers 259 case AlphaISA::IPR_HWINT_CLR: 260 case AlphaISA::IPR_SL_XMIT: 261 case AlphaISA::IPR_DC_FLUSH: 262 case AlphaISA::IPR_IC_FLUSH: 263 case AlphaISA::IPR_ALT_MODE: 264 case AlphaISA::IPR_DTB_IA: 265 case AlphaISA::IPR_DTB_IAP: 266 case AlphaISA::IPR_ITB_IA: 267 case AlphaISA::IPR_ITB_IAP: 268 panic("Tried to read write only register %d\n", idx); 269 break; 270 271 default: 272 // invalid IPR 273 panic("Tried to read from invalid ipr %d\n", idx); 274 break; 275 } 276 277 return retval; 278} 279 280#ifdef DEBUG 281// Cause the simulator to break when changing to the following IPL 282int break_ipl = -1; 283#endif 284 285void 286AlphaISA::MiscRegFile::setIpr(int idx, uint64_t val, ThreadContext *tc) 287{ 288 uint64_t old; 289 290 if (tc->misspeculating()) 291 return; 292 293 switch (idx) { 294 case AlphaISA::IPR_PALtemp0: 295 case AlphaISA::IPR_PALtemp1: 296 case AlphaISA::IPR_PALtemp2: 297 case AlphaISA::IPR_PALtemp3: 298 case AlphaISA::IPR_PALtemp4: 299 case AlphaISA::IPR_PALtemp5: 300 case AlphaISA::IPR_PALtemp6: 301 case AlphaISA::IPR_PALtemp7: 302 case AlphaISA::IPR_PALtemp8: 303 case AlphaISA::IPR_PALtemp9: 304 case AlphaISA::IPR_PALtemp10: 305 case AlphaISA::IPR_PALtemp11: 306 case AlphaISA::IPR_PALtemp12: 307 case AlphaISA::IPR_PALtemp13: 308 case AlphaISA::IPR_PALtemp14: 309 case AlphaISA::IPR_PALtemp15: 310 case AlphaISA::IPR_PALtemp16: 311 case AlphaISA::IPR_PALtemp17: 312 case AlphaISA::IPR_PALtemp18: 313 case AlphaISA::IPR_PALtemp19: 314 case AlphaISA::IPR_PALtemp20: 315 case AlphaISA::IPR_PALtemp21: 316 case AlphaISA::IPR_PALtemp22: 317 case AlphaISA::IPR_PAL_BASE: 318 case AlphaISA::IPR_IC_PERR_STAT: 319 case AlphaISA::IPR_DC_PERR_STAT: 320 case AlphaISA::IPR_PMCTR: 321 // write entire quad w/ no side-effect 322 ipr[idx] = val; 323 break; 324 325 case AlphaISA::IPR_CC_CTL: 326 // This IPR resets the cycle counter. We assume this only 327 // happens once... let's verify that. 328 assert(ipr[idx] == 0); 329 ipr[idx] = 1; 330 break; 331 332 case AlphaISA::IPR_CC: 333 // This IPR only writes the upper 64 bits. It's ok to write 334 // all 64 here since we mask out the lower 32 in rpcc (see 335 // isa_desc). 336 ipr[idx] = val; 337 break; 338 339 case AlphaISA::IPR_PALtemp23: 340 // write entire quad w/ no side-effect 341 old = ipr[idx]; 342 ipr[idx] = val; 343 if (tc->getKernelStats()) 344 tc->getKernelStats()->context(old, val, tc); 345 break; 346 347 case AlphaISA::IPR_DTB_PTE: 348 // write entire quad w/ no side-effect, tag is forthcoming 349 ipr[idx] = val; 350 break; 351 352 case AlphaISA::IPR_EXC_ADDR: 353 // second least significant bit in PC is always zero 354 ipr[idx] = val & ~2; 355 break; 356 357 case AlphaISA::IPR_ASTRR: 358 case AlphaISA::IPR_ASTER: 359 // only write least significant four bits - privilege mask 360 ipr[idx] = val & 0xf; 361 break; 362 363 case AlphaISA::IPR_IPLR: 364#ifdef DEBUG 365 if (break_ipl != -1 && break_ipl == (val & 0x1f)) 366 debug_break(); 367#endif 368 369 // only write least significant five bits - interrupt level 370 ipr[idx] = val & 0x1f; 371 if (tc->getKernelStats()) 372 tc->getKernelStats()->swpipl(ipr[idx]); 373 break; 374 375 case AlphaISA::IPR_DTB_CM: 376 if (val & 0x18) { 377 if (tc->getKernelStats()) 378 tc->getKernelStats()->mode(TheISA::Kernel::user, tc); 379 } else { 380 if (tc->getKernelStats()) 381 tc->getKernelStats()->mode(TheISA::Kernel::kernel, tc); 382 } 383 384 case AlphaISA::IPR_ICM: 385 // only write two mode bits - processor mode 386 ipr[idx] = val & 0x18; 387 break; 388 389 case AlphaISA::IPR_ALT_MODE: 390 // only write two mode bits - processor mode 391 ipr[idx] = val & 0x18; 392 break; 393 394 case AlphaISA::IPR_MCSR: 395 // more here after optimization... 396 ipr[idx] = val; 397 break; 398 399 case AlphaISA::IPR_SIRR: 400 // only write software interrupt mask 401 ipr[idx] = val & 0x7fff0; 402 break; 403 404 case AlphaISA::IPR_ICSR: 405 ipr[idx] = val & ULL(0xffffff0300); 406 break; 407 408 case AlphaISA::IPR_IVPTBR: 409 case AlphaISA::IPR_MVPTBR: 410 ipr[idx] = val & ULL(0xffffffffc0000000); 411 break; 412 413 case AlphaISA::IPR_DC_TEST_CTL: 414 ipr[idx] = val & 0x1ffb; 415 break; 416 417 case AlphaISA::IPR_DC_MODE: 418 case AlphaISA::IPR_MAF_MODE: 419 ipr[idx] = val & 0x3f; 420 break; 421 422 case AlphaISA::IPR_ITB_ASN: 423 ipr[idx] = val & 0x7f0; 424 break; 425 426 case AlphaISA::IPR_DTB_ASN: 427 ipr[idx] = val & ULL(0xfe00000000000000); 428 break; 429 430 case AlphaISA::IPR_EXC_SUM: 431 case AlphaISA::IPR_EXC_MASK: 432 // any write to this register clears it 433 ipr[idx] = 0; 434 break; 435 436 case AlphaISA::IPR_INTID: 437 case AlphaISA::IPR_SL_RCV: 438 case AlphaISA::IPR_MM_STAT: 439 case AlphaISA::IPR_ITB_PTE_TEMP: 440 case AlphaISA::IPR_DTB_PTE_TEMP: 441 // read-only registers 442 panic("Tried to write read only ipr %d\n", idx); 443 444 case AlphaISA::IPR_HWINT_CLR: 445 case AlphaISA::IPR_SL_XMIT: 446 case AlphaISA::IPR_DC_FLUSH: 447 case AlphaISA::IPR_IC_FLUSH: 448 // the following are write only 449 ipr[idx] = val; 450 break; 451 452 case AlphaISA::IPR_DTB_IA: 453 // really a control write 454 ipr[idx] = 0; 455 456 tc->getDTBPtr()->flushAll(); 457 break; 458 459 case AlphaISA::IPR_DTB_IAP: 460 // really a control write 461 ipr[idx] = 0; 462 463 tc->getDTBPtr()->flushProcesses(); 464 break; 465 466 case AlphaISA::IPR_DTB_IS: 467 // really a control write 468 ipr[idx] = val; 469 470 tc->getDTBPtr()->flushAddr(val, 471 DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN])); 472 break; 473 474 case AlphaISA::IPR_DTB_TAG: { 475 struct AlphaISA::PTE pte; 476 477 // FIXME: granularity hints NYI... 478 if (DTB_PTE_GH(ipr[AlphaISA::IPR_DTB_PTE]) != 0) 479 panic("PTE GH field != 0"); 480 481 // write entire quad 482 ipr[idx] = val; 483 484 // construct PTE for new entry 485 pte.ppn = DTB_PTE_PPN(ipr[AlphaISA::IPR_DTB_PTE]); 486 pte.xre = DTB_PTE_XRE(ipr[AlphaISA::IPR_DTB_PTE]); 487 pte.xwe = DTB_PTE_XWE(ipr[AlphaISA::IPR_DTB_PTE]); 488 pte.fonr = DTB_PTE_FONR(ipr[AlphaISA::IPR_DTB_PTE]); 489 pte.fonw = DTB_PTE_FONW(ipr[AlphaISA::IPR_DTB_PTE]); 490 pte.asma = DTB_PTE_ASMA(ipr[AlphaISA::IPR_DTB_PTE]); 491 pte.asn = DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]); 492 493 // insert new TAG/PTE value into data TLB 494 tc->getDTBPtr()->insert(val, pte); 495 } 496 break; 497 498 case AlphaISA::IPR_ITB_PTE: { 499 struct AlphaISA::PTE pte; 500 501 // FIXME: granularity hints NYI... 502 if (ITB_PTE_GH(val) != 0) 503 panic("PTE GH field != 0"); 504 505 // write entire quad 506 ipr[idx] = val; 507 508 // construct PTE for new entry 509 pte.ppn = ITB_PTE_PPN(val); 510 pte.xre = ITB_PTE_XRE(val); 511 pte.xwe = 0; 512 pte.fonr = ITB_PTE_FONR(val); 513 pte.fonw = ITB_PTE_FONW(val); 514 pte.asma = ITB_PTE_ASMA(val); 515 pte.asn = ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]); 516 517 // insert new TAG/PTE value into data TLB 518 tc->getITBPtr()->insert(ipr[AlphaISA::IPR_ITB_TAG], pte); 519 } 520 break; 521 522 case AlphaISA::IPR_ITB_IA: 523 // really a control write 524 ipr[idx] = 0; 525 526 tc->getITBPtr()->flushAll(); 527 break; 528 529 case AlphaISA::IPR_ITB_IAP: 530 // really a control write 531 ipr[idx] = 0; 532 533 tc->getITBPtr()->flushProcesses(); 534 break; 535 536 case AlphaISA::IPR_ITB_IS: 537 // really a control write 538 ipr[idx] = val; 539 540 tc->getITBPtr()->flushAddr(val, 541 ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN])); 542 break; 543 544 default: 545 // invalid IPR 546 panic("Tried to write to invalid ipr %d\n", idx); 547 } 548 549 // no error... 550} 551 552 553void 554AlphaISA::copyIprs(ThreadContext *src, ThreadContext *dest) 555{ 556 for (int i = 0; i < NumInternalProcRegs; ++i) { 557 dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i)); 558 } 559} 560 561 562/** 563 * Check for special simulator handling of specific PAL calls. 564 * If return value is false, actual PAL call will be suppressed. 565 */ 566bool 567SimpleThread::simPalCheck(int palFunc) 568{ 569 if (kernelStats) 570 kernelStats->callpal(palFunc, tc); 571 572 switch (palFunc) { 573 case PAL::halt: 574 halt(); 575 if (--System::numSystemsRunning == 0) 576 exitSimLoop("all cpus halted"); 577 break; 578 579 case PAL::bpt: 580 case PAL::bugchk: 581 if (system->breakpoint()) 582 return false; 583 break; 584 } 585 586 return true; 587} 588 589#endif // FULL_SYSTEM 590