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