ev5.cc revision 2654:9559cfa91b9d
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 29#include "arch/alpha/tlb.hh" 30#include "arch/alpha/isa_traits.hh" 31#include "arch/alpha/osfpal.hh" 32#include "base/kgdb.h" 33#include "base/remote_gdb.hh" 34#include "base/stats/events.hh" 35#include "config/full_system.hh" 36#include "cpu/base.hh" 37#include "cpu/cpu_exec_context.hh" 38#include "cpu/exec_context.hh" 39#include "kern/kernel_stats.hh" 40#include "sim/debug.hh" 41#include "sim/sim_events.hh" 42 43#if FULL_SYSTEM 44 45using namespace EV5; 46 47//////////////////////////////////////////////////////////////////////// 48// 49// Machine dependent functions 50// 51void 52AlphaISA::initCPU(ExecContext *xc, int cpuId) 53{ 54 initIPRs(xc, cpuId); 55 56 xc->setIntReg(16, cpuId); 57 xc->setIntReg(0, cpuId); 58 59 xc->setPC(xc->readMiscReg(IPR_PAL_BASE) + (new ResetFault)->vect()); 60 xc->setNextPC(xc->readPC() + sizeof(MachInst)); 61} 62 63//////////////////////////////////////////////////////////////////////// 64// 65// 66// 67void 68AlphaISA::initIPRs(ExecContext *xc, int cpuId) 69{ 70 for (int i = 0; i < NumInternalProcRegs; ++i) { 71 xc->setMiscReg(i, 0); 72 } 73 74 xc->setMiscReg(IPR_PAL_BASE, PalBase); 75 xc->setMiscReg(IPR_MCSR, 0x6); 76 xc->setMiscReg(IPR_PALtemp16, cpuId); 77} 78 79 80template <class CPU> 81void 82AlphaISA::processInterrupts(CPU *cpu) 83{ 84 //Check if there are any outstanding interrupts 85 //Handle the interrupts 86 int ipl = 0; 87 int summary = 0; 88 89 cpu->checkInterrupts = false; 90 91 if (cpu->readMiscReg(IPR_ASTRR)) 92 panic("asynchronous traps not implemented\n"); 93 94 if (cpu->readMiscReg(IPR_SIRR)) { 95 for (int i = INTLEVEL_SOFTWARE_MIN; 96 i < INTLEVEL_SOFTWARE_MAX; i++) { 97 if (cpu->readMiscReg(IPR_SIRR) & (ULL(1) << i)) { 98 // See table 4-19 of the 21164 hardware reference 99 ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1; 100 summary |= (ULL(1) << i); 101 } 102 } 103 } 104 105 uint64_t interrupts = cpu->intr_status(); 106 107 if (interrupts) { 108 for (int i = INTLEVEL_EXTERNAL_MIN; 109 i < INTLEVEL_EXTERNAL_MAX; i++) { 110 if (interrupts & (ULL(1) << i)) { 111 // See table 4-19 of the 21164 hardware reference 112 ipl = i; 113 summary |= (ULL(1) << i); 114 } 115 } 116 } 117 118 if (ipl && ipl > cpu->readMiscReg(IPR_IPLR)) { 119 cpu->setMiscReg(IPR_ISR, summary); 120 cpu->setMiscReg(IPR_INTID, ipl); 121 cpu->trap(new InterruptFault); 122 DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n", 123 cpu->readMiscReg(IPR_IPLR), ipl, summary); 124 } 125 126} 127 128template <class CPU> 129void 130AlphaISA::zeroRegisters(CPU *cpu) 131{ 132 // Insure ISA semantics 133 // (no longer very clean due to the change in setIntReg() in the 134 // cpu model. Consider changing later.) 135 cpu->cpuXC->setIntReg(ZeroReg, 0); 136 cpu->cpuXC->setFloatReg(ZeroReg, 0.0); 137} 138 139Fault 140CPUExecContext::hwrei() 141{ 142 if (!inPalMode()) 143 return new UnimplementedOpcodeFault; 144 145 setNextPC(readMiscReg(AlphaISA::IPR_EXC_ADDR)); 146 147 if (!misspeculating()) { 148 if (kernelStats) 149 kernelStats->hwrei(); 150 151 cpu->checkInterrupts = true; 152 } 153 154 // FIXME: XXX check for interrupts? XXX 155 return NoFault; 156} 157 158int 159AlphaISA::MiscRegFile::getInstAsid() 160{ 161 return EV5::ITB_ASN_ASN(ipr[IPR_ITB_ASN]); 162} 163 164int 165AlphaISA::MiscRegFile::getDataAsid() 166{ 167 return EV5::DTB_ASN_ASN(ipr[IPR_DTB_ASN]); 168} 169 170AlphaISA::MiscReg 171AlphaISA::MiscRegFile::readIpr(int idx, Fault &fault, ExecContext *xc) 172{ 173 uint64_t retval = 0; // return value, default 0 174 175 switch (idx) { 176 case AlphaISA::IPR_PALtemp0: 177 case AlphaISA::IPR_PALtemp1: 178 case AlphaISA::IPR_PALtemp2: 179 case AlphaISA::IPR_PALtemp3: 180 case AlphaISA::IPR_PALtemp4: 181 case AlphaISA::IPR_PALtemp5: 182 case AlphaISA::IPR_PALtemp6: 183 case AlphaISA::IPR_PALtemp7: 184 case AlphaISA::IPR_PALtemp8: 185 case AlphaISA::IPR_PALtemp9: 186 case AlphaISA::IPR_PALtemp10: 187 case AlphaISA::IPR_PALtemp11: 188 case AlphaISA::IPR_PALtemp12: 189 case AlphaISA::IPR_PALtemp13: 190 case AlphaISA::IPR_PALtemp14: 191 case AlphaISA::IPR_PALtemp15: 192 case AlphaISA::IPR_PALtemp16: 193 case AlphaISA::IPR_PALtemp17: 194 case AlphaISA::IPR_PALtemp18: 195 case AlphaISA::IPR_PALtemp19: 196 case AlphaISA::IPR_PALtemp20: 197 case AlphaISA::IPR_PALtemp21: 198 case AlphaISA::IPR_PALtemp22: 199 case AlphaISA::IPR_PALtemp23: 200 case AlphaISA::IPR_PAL_BASE: 201 202 case AlphaISA::IPR_IVPTBR: 203 case AlphaISA::IPR_DC_MODE: 204 case AlphaISA::IPR_MAF_MODE: 205 case AlphaISA::IPR_ISR: 206 case AlphaISA::IPR_EXC_ADDR: 207 case AlphaISA::IPR_IC_PERR_STAT: 208 case AlphaISA::IPR_DC_PERR_STAT: 209 case AlphaISA::IPR_MCSR: 210 case AlphaISA::IPR_ASTRR: 211 case AlphaISA::IPR_ASTER: 212 case AlphaISA::IPR_SIRR: 213 case AlphaISA::IPR_ICSR: 214 case AlphaISA::IPR_ICM: 215 case AlphaISA::IPR_DTB_CM: 216 case AlphaISA::IPR_IPLR: 217 case AlphaISA::IPR_INTID: 218 case AlphaISA::IPR_PMCTR: 219 // no side-effect 220 retval = ipr[idx]; 221 break; 222 223 case AlphaISA::IPR_CC: 224 retval |= ipr[idx] & ULL(0xffffffff00000000); 225 retval |= xc->getCpuPtr()->curCycle() & ULL(0x00000000ffffffff); 226 break; 227 228 case AlphaISA::IPR_VA: 229 retval = ipr[idx]; 230 break; 231 232 case AlphaISA::IPR_VA_FORM: 233 case AlphaISA::IPR_MM_STAT: 234 case AlphaISA::IPR_IFAULT_VA_FORM: 235 case AlphaISA::IPR_EXC_MASK: 236 case AlphaISA::IPR_EXC_SUM: 237 retval = ipr[idx]; 238 break; 239 240 case AlphaISA::IPR_DTB_PTE: 241 { 242 AlphaISA::PTE &pte = xc->getDTBPtr()->index(!xc->misspeculating()); 243 244 retval |= ((u_int64_t)pte.ppn & ULL(0x7ffffff)) << 32; 245 retval |= ((u_int64_t)pte.xre & ULL(0xf)) << 8; 246 retval |= ((u_int64_t)pte.xwe & ULL(0xf)) << 12; 247 retval |= ((u_int64_t)pte.fonr & ULL(0x1)) << 1; 248 retval |= ((u_int64_t)pte.fonw & ULL(0x1))<< 2; 249 retval |= ((u_int64_t)pte.asma & ULL(0x1)) << 4; 250 retval |= ((u_int64_t)pte.asn & ULL(0x7f)) << 57; 251 } 252 break; 253 254 // write only registers 255 case AlphaISA::IPR_HWINT_CLR: 256 case AlphaISA::IPR_SL_XMIT: 257 case AlphaISA::IPR_DC_FLUSH: 258 case AlphaISA::IPR_IC_FLUSH: 259 case AlphaISA::IPR_ALT_MODE: 260 case AlphaISA::IPR_DTB_IA: 261 case AlphaISA::IPR_DTB_IAP: 262 case AlphaISA::IPR_ITB_IA: 263 case AlphaISA::IPR_ITB_IAP: 264 fault = new UnimplementedOpcodeFault; 265 break; 266 267 default: 268 // invalid IPR 269 fault = new UnimplementedOpcodeFault; 270 break; 271 } 272 273 return retval; 274} 275 276#ifdef DEBUG 277// Cause the simulator to break when changing to the following IPL 278int break_ipl = -1; 279#endif 280 281Fault 282AlphaISA::MiscRegFile::setIpr(int idx, uint64_t val, ExecContext *xc) 283{ 284 uint64_t old; 285 286 if (xc->misspeculating()) 287 return NoFault; 288 289 switch (idx) { 290 case AlphaISA::IPR_PALtemp0: 291 case AlphaISA::IPR_PALtemp1: 292 case AlphaISA::IPR_PALtemp2: 293 case AlphaISA::IPR_PALtemp3: 294 case AlphaISA::IPR_PALtemp4: 295 case AlphaISA::IPR_PALtemp5: 296 case AlphaISA::IPR_PALtemp6: 297 case AlphaISA::IPR_PALtemp7: 298 case AlphaISA::IPR_PALtemp8: 299 case AlphaISA::IPR_PALtemp9: 300 case AlphaISA::IPR_PALtemp10: 301 case AlphaISA::IPR_PALtemp11: 302 case AlphaISA::IPR_PALtemp12: 303 case AlphaISA::IPR_PALtemp13: 304 case AlphaISA::IPR_PALtemp14: 305 case AlphaISA::IPR_PALtemp15: 306 case AlphaISA::IPR_PALtemp16: 307 case AlphaISA::IPR_PALtemp17: 308 case AlphaISA::IPR_PALtemp18: 309 case AlphaISA::IPR_PALtemp19: 310 case AlphaISA::IPR_PALtemp20: 311 case AlphaISA::IPR_PALtemp21: 312 case AlphaISA::IPR_PALtemp22: 313 case AlphaISA::IPR_PAL_BASE: 314 case AlphaISA::IPR_IC_PERR_STAT: 315 case AlphaISA::IPR_DC_PERR_STAT: 316 case AlphaISA::IPR_PMCTR: 317 // write entire quad w/ no side-effect 318 ipr[idx] = val; 319 break; 320 321 case AlphaISA::IPR_CC_CTL: 322 // This IPR resets the cycle counter. We assume this only 323 // happens once... let's verify that. 324 assert(ipr[idx] == 0); 325 ipr[idx] = 1; 326 break; 327 328 case AlphaISA::IPR_CC: 329 // This IPR only writes the upper 64 bits. It's ok to write 330 // all 64 here since we mask out the lower 32 in rpcc (see 331 // isa_desc). 332 ipr[idx] = val; 333 break; 334 335 case AlphaISA::IPR_PALtemp23: 336 // write entire quad w/ no side-effect 337 old = ipr[idx]; 338 ipr[idx] = val; 339 if (xc->getKernelStats()) 340 xc->getKernelStats()->context(old, val, xc); 341 break; 342 343 case AlphaISA::IPR_DTB_PTE: 344 // write entire quad w/ no side-effect, tag is forthcoming 345 ipr[idx] = val; 346 break; 347 348 case AlphaISA::IPR_EXC_ADDR: 349 // second least significant bit in PC is always zero 350 ipr[idx] = val & ~2; 351 break; 352 353 case AlphaISA::IPR_ASTRR: 354 case AlphaISA::IPR_ASTER: 355 // only write least significant four bits - privilege mask 356 ipr[idx] = val & 0xf; 357 break; 358 359 case AlphaISA::IPR_IPLR: 360#ifdef DEBUG 361 if (break_ipl != -1 && break_ipl == (val & 0x1f)) 362 debug_break(); 363#endif 364 365 // only write least significant five bits - interrupt level 366 ipr[idx] = val & 0x1f; 367 if (xc->getKernelStats()) 368 xc->getKernelStats()->swpipl(ipr[idx]); 369 break; 370 371 case AlphaISA::IPR_DTB_CM: 372 if (val & 0x18) { 373 if (xc->getKernelStats()) 374 xc->getKernelStats()->mode(Kernel::user, xc); 375 } else { 376 if (xc->getKernelStats()) 377 xc->getKernelStats()->mode(Kernel::kernel, xc); 378 } 379 380 case AlphaISA::IPR_ICM: 381 // only write two mode bits - processor mode 382 ipr[idx] = val & 0x18; 383 break; 384 385 case AlphaISA::IPR_ALT_MODE: 386 // only write two mode bits - processor mode 387 ipr[idx] = val & 0x18; 388 break; 389 390 case AlphaISA::IPR_MCSR: 391 // more here after optimization... 392 ipr[idx] = val; 393 break; 394 395 case AlphaISA::IPR_SIRR: 396 // only write software interrupt mask 397 ipr[idx] = val & 0x7fff0; 398 break; 399 400 case AlphaISA::IPR_ICSR: 401 ipr[idx] = val & ULL(0xffffff0300); 402 break; 403 404 case AlphaISA::IPR_IVPTBR: 405 case AlphaISA::IPR_MVPTBR: 406 ipr[idx] = val & ULL(0xffffffffc0000000); 407 break; 408 409 case AlphaISA::IPR_DC_TEST_CTL: 410 ipr[idx] = val & 0x1ffb; 411 break; 412 413 case AlphaISA::IPR_DC_MODE: 414 case AlphaISA::IPR_MAF_MODE: 415 ipr[idx] = val & 0x3f; 416 break; 417 418 case AlphaISA::IPR_ITB_ASN: 419 ipr[idx] = val & 0x7f0; 420 break; 421 422 case AlphaISA::IPR_DTB_ASN: 423 ipr[idx] = val & ULL(0xfe00000000000000); 424 break; 425 426 case AlphaISA::IPR_EXC_SUM: 427 case AlphaISA::IPR_EXC_MASK: 428 // any write to this register clears it 429 ipr[idx] = 0; 430 break; 431 432 case AlphaISA::IPR_INTID: 433 case AlphaISA::IPR_SL_RCV: 434 case AlphaISA::IPR_MM_STAT: 435 case AlphaISA::IPR_ITB_PTE_TEMP: 436 case AlphaISA::IPR_DTB_PTE_TEMP: 437 // read-only registers 438 return new UnimplementedOpcodeFault; 439 440 case AlphaISA::IPR_HWINT_CLR: 441 case AlphaISA::IPR_SL_XMIT: 442 case AlphaISA::IPR_DC_FLUSH: 443 case AlphaISA::IPR_IC_FLUSH: 444 // the following are write only 445 ipr[idx] = val; 446 break; 447 448 case AlphaISA::IPR_DTB_IA: 449 // really a control write 450 ipr[idx] = 0; 451 452 xc->getDTBPtr()->flushAll(); 453 break; 454 455 case AlphaISA::IPR_DTB_IAP: 456 // really a control write 457 ipr[idx] = 0; 458 459 xc->getDTBPtr()->flushProcesses(); 460 break; 461 462 case AlphaISA::IPR_DTB_IS: 463 // really a control write 464 ipr[idx] = val; 465 466 xc->getDTBPtr()->flushAddr(val, 467 DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN])); 468 break; 469 470 case AlphaISA::IPR_DTB_TAG: { 471 struct AlphaISA::PTE pte; 472 473 // FIXME: granularity hints NYI... 474 if (DTB_PTE_GH(ipr[AlphaISA::IPR_DTB_PTE]) != 0) 475 panic("PTE GH field != 0"); 476 477 // write entire quad 478 ipr[idx] = val; 479 480 // construct PTE for new entry 481 pte.ppn = DTB_PTE_PPN(ipr[AlphaISA::IPR_DTB_PTE]); 482 pte.xre = DTB_PTE_XRE(ipr[AlphaISA::IPR_DTB_PTE]); 483 pte.xwe = DTB_PTE_XWE(ipr[AlphaISA::IPR_DTB_PTE]); 484 pte.fonr = DTB_PTE_FONR(ipr[AlphaISA::IPR_DTB_PTE]); 485 pte.fonw = DTB_PTE_FONW(ipr[AlphaISA::IPR_DTB_PTE]); 486 pte.asma = DTB_PTE_ASMA(ipr[AlphaISA::IPR_DTB_PTE]); 487 pte.asn = DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]); 488 489 // insert new TAG/PTE value into data TLB 490 xc->getDTBPtr()->insert(val, pte); 491 } 492 break; 493 494 case AlphaISA::IPR_ITB_PTE: { 495 struct AlphaISA::PTE pte; 496 497 // FIXME: granularity hints NYI... 498 if (ITB_PTE_GH(val) != 0) 499 panic("PTE GH field != 0"); 500 501 // write entire quad 502 ipr[idx] = val; 503 504 // construct PTE for new entry 505 pte.ppn = ITB_PTE_PPN(val); 506 pte.xre = ITB_PTE_XRE(val); 507 pte.xwe = 0; 508 pte.fonr = ITB_PTE_FONR(val); 509 pte.fonw = ITB_PTE_FONW(val); 510 pte.asma = ITB_PTE_ASMA(val); 511 pte.asn = ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]); 512 513 // insert new TAG/PTE value into data TLB 514 xc->getITBPtr()->insert(ipr[AlphaISA::IPR_ITB_TAG], pte); 515 } 516 break; 517 518 case AlphaISA::IPR_ITB_IA: 519 // really a control write 520 ipr[idx] = 0; 521 522 xc->getITBPtr()->flushAll(); 523 break; 524 525 case AlphaISA::IPR_ITB_IAP: 526 // really a control write 527 ipr[idx] = 0; 528 529 xc->getITBPtr()->flushProcesses(); 530 break; 531 532 case AlphaISA::IPR_ITB_IS: 533 // really a control write 534 ipr[idx] = val; 535 536 xc->getITBPtr()->flushAddr(val, 537 ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN])); 538 break; 539 540 default: 541 // invalid IPR 542 return new UnimplementedOpcodeFault; 543 } 544 545 // no error... 546 return NoFault; 547} 548 549void 550AlphaISA::copyIprs(ExecContext *src, ExecContext *dest) 551{ 552 for (int i = IPR_Base_DepTag; i < NumInternalProcRegs; ++i) { 553 dest->setMiscReg(i, src->readMiscReg(i)); 554 } 555} 556 557/** 558 * Check for special simulator handling of specific PAL calls. 559 * If return value is false, actual PAL call will be suppressed. 560 */ 561bool 562CPUExecContext::simPalCheck(int palFunc) 563{ 564 if (kernelStats) 565 kernelStats->callpal(palFunc, proxy); 566 567 switch (palFunc) { 568 case PAL::halt: 569 halt(); 570 if (--System::numSystemsRunning == 0) 571 new SimExitEvent("all cpus halted"); 572 break; 573 574 case PAL::bpt: 575 case PAL::bugchk: 576 if (system->breakpoint()) 577 return false; 578 break; 579 } 580 581 return true; 582} 583 584#endif // FULL_SYSTEM 585