ev5.cc revision 710 
1/* $Id$ */
2
3#include "targetarch/alpha_memory.hh"
4#include "sim/annotation.hh"
5#ifdef DEBUG
6#include "sim/debug.hh"
7#endif
8#include "cpu/exec_context.hh"
9#include "sim/sim_events.hh"
10#include "targetarch/isa_traits.hh"
11#include "base/remote_gdb.hh"
12#include "base/kgdb.h"	// for ALPHA_KENTRY_IF
13#include "targetarch/osfpal.hh"
14
15#ifdef FULL_SYSTEM
16
17#ifndef SYSTEM_EV5
18#error This code is only valid for EV5 systems
19#endif
20
21////////////////////////////////////////////////////////////////////////
22//
23//
24//
25void
26AlphaISA::swap_palshadow(RegFile *regs, bool use_shadow)
27{
28    if (regs->pal_shadow == use_shadow)
29        panic("swap_palshadow: wrong PAL shadow state");
30
31    regs->pal_shadow = use_shadow;
32
33    for (int i = 0; i < NumIntRegs; i++) {
34        if (reg_redir[i]) {
35            IntReg temp = regs->intRegFile[i];
36            regs->intRegFile[i] = regs->palregs[i];
37            regs->palregs[i] = temp;
38        }
39    }
40}
41
42////////////////////////////////////////////////////////////////////////
43//
44//  Machine dependent functions
45//
46void
47AlphaISA::initCPU(RegFile *regs)
48{
49    initIPRs(regs);
50    // CPU comes up with PAL regs enabled
51    swap_palshadow(regs, true);
52
53    regs->pc = regs->ipr[IPR_PAL_BASE] + fault_addr[Reset_Fault];
54    regs->npc = regs->pc + sizeof(MachInst);
55}
56
57////////////////////////////////////////////////////////////////////////
58//
59// alpha exceptions - value equals trap address, update with MD_FAULT_TYPE
60//
61Addr
62AlphaISA::fault_addr[Num_Faults] = {
63    0x0000,	/* No_Fault */
64    0x0001,	/* Reset_Fault */
65    0x0401,	/* Machine_Check_Fault */
66    0x0501,	/* Arithmetic_Fault */
67    0x0101,	/* Interrupt_Fault */
68    0x0201,	/* Ndtb_Miss_Fault */
69    0x0281,	/* Pdtb_Miss_Fault */
70    0x0301,	/* Alignment_Fault */
71    0x0381,	/* DTB_Fault_Fault */
72    0x0381,	/* DTB_Acv_Fault */
73    0x0181,	/* ITB_Miss_Fault */
74    0x0181,	/* ITB_Fault_Fault */
75    0x0081,	/* ITB_Acv_Fault */
76    0x0481,	/* Unimplemented_Opcode_Fault */
77    0x0581,	/* Fen_Fault */
78    0x2001,	/* Pal_Fault */
79    0x0501,	/* Integer_Overflow_Fault: maps to Arithmetic_Fault */
80};
81
82const int AlphaISA::reg_redir[AlphaISA::NumIntRegs] = {
83    /*  0 */ 0, 0, 0, 0, 0, 0, 0, 0,
84    /*  8 */ 1, 1, 1, 1, 1, 1, 1, 0,
85    /* 16 */ 0, 0, 0, 0, 0, 0, 0, 0,
86    /* 24 */ 0, 1, 0, 0, 0, 0, 0, 0 };
87
88////////////////////////////////////////////////////////////////////////
89//
90//
91//
92void
93AlphaISA::initIPRs(RegFile *regs)
94{
95    uint64_t *ipr = regs->ipr;
96
97    bzero((char *)ipr, NumInternalProcRegs * sizeof(InternalProcReg));
98    ipr[IPR_PAL_BASE] = PAL_BASE;
99    ipr[IPR_MCSR] = 0x6;
100}
101
102
103void
104ExecContext::ev5_trap(Fault fault)
105{
106    assert(!misspeculating());
107    kernelStats.fault(fault);
108
109    if (fault == Arithmetic_Fault)
110        panic("Arithmetic traps are unimplemented!");
111
112    AlphaISA::InternalProcReg *ipr = regs.ipr;
113
114    // exception restart address
115    if (fault != Interrupt_Fault || !PC_PAL(regs.pc))
116        ipr[AlphaISA::IPR_EXC_ADDR] = regs.pc;
117
118    if (fault == Pal_Fault || fault == Arithmetic_Fault /* ||
119        fault == Interrupt_Fault && !PC_PAL(regs.pc) */) {
120        // traps...  skip faulting instruction
121        ipr[AlphaISA::IPR_EXC_ADDR] += 4;
122    }
123
124    if (!PC_PAL(regs.pc))
125        AlphaISA::swap_palshadow(&regs, true);
126
127    regs.pc = ipr[AlphaISA::IPR_PAL_BASE] + AlphaISA::fault_addr[fault];
128    regs.npc = regs.pc + sizeof(MachInst);
129
130    Annotate::Ev5Trap(this, fault);
131}
132
133
134void
135AlphaISA::intr_post(RegFile *regs, Fault fault, Addr pc)
136{
137    InternalProcReg *ipr = regs->ipr;
138    bool use_pc = (fault == No_Fault);
139
140    if (fault == Arithmetic_Fault)
141        panic("arithmetic faults NYI...");
142
143    // compute exception restart address
144    if (use_pc || fault == Pal_Fault || fault == Arithmetic_Fault) {
145        // traps...  skip faulting instruction
146        ipr[IPR_EXC_ADDR] = regs->pc + 4;
147    } else {
148        // fault, post fault at excepting instruction
149        ipr[IPR_EXC_ADDR] = regs->pc;
150    }
151
152    // jump to expection address (PAL PC bit set here as well...)
153    if (!use_pc)
154        regs->npc = ipr[IPR_PAL_BASE] + fault_addr[fault];
155    else
156        regs->npc = ipr[IPR_PAL_BASE] + pc;
157
158    // that's it! (orders of magnitude less painful than x86)
159}
160
161bool AlphaISA::check_interrupts = false;
162
163Fault
164ExecContext::hwrei()
165{
166    uint64_t *ipr = regs.ipr;
167
168    if (!PC_PAL(regs.pc))
169        return Unimplemented_Opcode_Fault;
170
171    setNextPC(ipr[AlphaISA::IPR_EXC_ADDR]);
172
173    if (!misspeculating()) {
174        kernelStats.hwrei();
175
176        if ((ipr[AlphaISA::IPR_EXC_ADDR] & 1) == 0)
177            AlphaISA::swap_palshadow(&regs, false);
178
179        AlphaISA::check_interrupts = true;
180    }
181
182    // FIXME: XXX check for interrupts? XXX
183    return No_Fault;
184}
185
186uint64_t
187ExecContext::readIpr(int idx, Fault &fault)
188{
189    uint64_t *ipr = regs.ipr;
190    uint64_t retval = 0;	// return value, default 0
191
192    switch (idx) {
193      case AlphaISA::IPR_PALtemp0:
194      case AlphaISA::IPR_PALtemp1:
195      case AlphaISA::IPR_PALtemp2:
196      case AlphaISA::IPR_PALtemp3:
197      case AlphaISA::IPR_PALtemp4:
198      case AlphaISA::IPR_PALtemp5:
199      case AlphaISA::IPR_PALtemp6:
200      case AlphaISA::IPR_PALtemp7:
201      case AlphaISA::IPR_PALtemp8:
202      case AlphaISA::IPR_PALtemp9:
203      case AlphaISA::IPR_PALtemp10:
204      case AlphaISA::IPR_PALtemp11:
205      case AlphaISA::IPR_PALtemp12:
206      case AlphaISA::IPR_PALtemp13:
207      case AlphaISA::IPR_PALtemp14:
208      case AlphaISA::IPR_PALtemp15:
209      case AlphaISA::IPR_PALtemp16:
210      case AlphaISA::IPR_PALtemp17:
211      case AlphaISA::IPR_PALtemp18:
212      case AlphaISA::IPR_PALtemp19:
213      case AlphaISA::IPR_PALtemp20:
214      case AlphaISA::IPR_PALtemp21:
215      case AlphaISA::IPR_PALtemp22:
216      case AlphaISA::IPR_PALtemp23:
217      case AlphaISA::IPR_PAL_BASE:
218
219      case AlphaISA::IPR_IVPTBR:
220      case AlphaISA::IPR_DC_MODE:
221      case AlphaISA::IPR_MAF_MODE:
222      case AlphaISA::IPR_ISR:
223      case AlphaISA::IPR_EXC_ADDR:
224      case AlphaISA::IPR_IC_PERR_STAT:
225      case AlphaISA::IPR_DC_PERR_STAT:
226      case AlphaISA::IPR_MCSR:
227      case AlphaISA::IPR_ASTRR:
228      case AlphaISA::IPR_ASTER:
229      case AlphaISA::IPR_SIRR:
230      case AlphaISA::IPR_ICSR:
231      case AlphaISA::IPR_ICM:
232      case AlphaISA::IPR_DTB_CM:
233      case AlphaISA::IPR_IPLR:
234      case AlphaISA::IPR_INTID:
235      case AlphaISA::IPR_PMCTR:
236        // no side-effect
237        retval = ipr[idx];
238        break;
239
240      case AlphaISA::IPR_CC:
241        retval |= ipr[idx] & ULL(0xffffffff00000000);
242        retval |= curTick  & ULL(0x00000000ffffffff);
243        break;
244
245      case AlphaISA::IPR_VA:
246        // SFX: unlocks interrupt status registers
247        retval = ipr[idx];
248
249        if (!misspeculating())
250            regs.intrlock = false;
251        break;
252
253      case AlphaISA::IPR_VA_FORM:
254      case AlphaISA::IPR_MM_STAT:
255      case AlphaISA::IPR_IFAULT_VA_FORM:
256      case AlphaISA::IPR_EXC_MASK:
257      case AlphaISA::IPR_EXC_SUM:
258        retval = ipr[idx];
259        break;
260
261      case AlphaISA::IPR_DTB_PTE:
262        {
263            AlphaISA::PTE &pte = dtb->index(!misspeculating());
264
265            retval |= ((u_int64_t)pte.ppn & ULL(0x7ffffff)) << 32;
266            retval |= ((u_int64_t)pte.xre & ULL(0xf)) << 8;
267            retval |= ((u_int64_t)pte.xwe & ULL(0xf)) << 12;
268            retval |= ((u_int64_t)pte.fonr & ULL(0x1)) << 1;
269            retval |= ((u_int64_t)pte.fonw & ULL(0x1))<< 2;
270            retval |= ((u_int64_t)pte.asma & ULL(0x1)) << 4;
271            retval |= ((u_int64_t)pte.asn & ULL(0x7f)) << 57;
272        }
273        break;
274
275        // write only registers
276      case AlphaISA::IPR_HWINT_CLR:
277      case AlphaISA::IPR_SL_XMIT:
278      case AlphaISA::IPR_DC_FLUSH:
279      case AlphaISA::IPR_IC_FLUSH:
280      case AlphaISA::IPR_ALT_MODE:
281      case AlphaISA::IPR_DTB_IA:
282      case AlphaISA::IPR_DTB_IAP:
283      case AlphaISA::IPR_ITB_IA:
284      case AlphaISA::IPR_ITB_IAP:
285        fault = Unimplemented_Opcode_Fault;
286        break;
287
288      default:
289        // invalid IPR
290        fault = Unimplemented_Opcode_Fault;
291        break;
292    }
293
294    return retval;
295}
296
297#ifdef DEBUG
298// Cause the simulator to break when changing to the following IPL
299int break_ipl = -1;
300#endif
301
302Fault
303ExecContext::setIpr(int idx, uint64_t val)
304{
305    uint64_t *ipr = regs.ipr;
306    uint64_t old;
307
308    if (misspeculating())
309        return No_Fault;
310
311    switch (idx) {
312      case AlphaISA::IPR_PALtemp0:
313      case AlphaISA::IPR_PALtemp1:
314      case AlphaISA::IPR_PALtemp2:
315      case AlphaISA::IPR_PALtemp3:
316      case AlphaISA::IPR_PALtemp4:
317      case AlphaISA::IPR_PALtemp5:
318      case AlphaISA::IPR_PALtemp6:
319      case AlphaISA::IPR_PALtemp7:
320      case AlphaISA::IPR_PALtemp8:
321      case AlphaISA::IPR_PALtemp9:
322      case AlphaISA::IPR_PALtemp10:
323      case AlphaISA::IPR_PALtemp11:
324      case AlphaISA::IPR_PALtemp12:
325      case AlphaISA::IPR_PALtemp13:
326      case AlphaISA::IPR_PALtemp14:
327      case AlphaISA::IPR_PALtemp15:
328      case AlphaISA::IPR_PALtemp16:
329      case AlphaISA::IPR_PALtemp17:
330      case AlphaISA::IPR_PALtemp18:
331      case AlphaISA::IPR_PALtemp19:
332      case AlphaISA::IPR_PALtemp20:
333      case AlphaISA::IPR_PALtemp21:
334      case AlphaISA::IPR_PALtemp22:
335      case AlphaISA::IPR_PAL_BASE:
336      case AlphaISA::IPR_IC_PERR_STAT:
337      case AlphaISA::IPR_DC_PERR_STAT:
338      case AlphaISA::IPR_PMCTR:
339        // write entire quad w/ no side-effect
340        ipr[idx] = val;
341        break;
342
343      case AlphaISA::IPR_CC_CTL:
344        // This IPR resets the cycle counter.  We assume this only
345        // happens once... let's verify that.
346        assert(ipr[idx] == 0);
347        ipr[idx] = 1;
348        break;
349
350      case AlphaISA::IPR_CC:
351        // This IPR only writes the upper 64 bits.  It's ok to write
352        // all 64 here since we mask out the lower 32 in rpcc (see
353        // isa_desc).
354        ipr[idx] = val;
355        break;
356
357      case AlphaISA::IPR_PALtemp23:
358        // write entire quad w/ no side-effect
359        old = ipr[idx];
360        ipr[idx] = val;
361        kernelStats.context(old, val);
362        Annotate::Context(this);
363        break;
364
365      case AlphaISA::IPR_DTB_PTE:
366        // write entire quad w/ no side-effect, tag is forthcoming
367        ipr[idx] = val;
368        break;
369
370      case AlphaISA::IPR_EXC_ADDR:
371        // second least significant bit in PC is always zero
372        ipr[idx] = val & ~2;
373        break;
374
375      case AlphaISA::IPR_ASTRR:
376      case AlphaISA::IPR_ASTER:
377        // only write least significant four bits - privilege mask
378        ipr[idx] = val & 0xf;
379        break;
380
381      case AlphaISA::IPR_IPLR:
382#ifdef DEBUG
383        if (break_ipl != -1 && break_ipl == (val & 0x1f))
384            debug_break();
385#endif
386
387        // only write least significant five bits - interrupt level
388        ipr[idx] = val & 0x1f;
389        kernelStats.swpipl(ipr[idx]);
390        Annotate::IPL(this, val & 0x1f);
391        break;
392
393      case AlphaISA::IPR_DTB_CM:
394        Annotate::ChangeMode(this, (val & 0x18) != 0);
395        kernelStats.mode((val & 0x18) != 0);
396
397      case AlphaISA::IPR_ICM:
398        // only write two mode bits - processor mode
399        ipr[idx] = val & 0x18;
400        break;
401
402      case AlphaISA::IPR_ALT_MODE:
403        // only write two mode bits - processor mode
404        ipr[idx] = val & 0x18;
405        break;
406
407      case AlphaISA::IPR_MCSR:
408        // more here after optimization...
409        ipr[idx] = val;
410        break;
411
412      case AlphaISA::IPR_SIRR:
413        // only write software interrupt mask
414        ipr[idx] = val & 0x7fff0;
415        break;
416
417      case AlphaISA::IPR_ICSR:
418        ipr[idx] = val & ULL(0xffffff0300);
419        break;
420
421      case AlphaISA::IPR_IVPTBR:
422      case AlphaISA::IPR_MVPTBR:
423        ipr[idx] = val & ULL(0xffffffffc0000000);
424        break;
425
426      case AlphaISA::IPR_DC_TEST_CTL:
427        ipr[idx] = val & 0x1ffb;
428        break;
429
430      case AlphaISA::IPR_DC_MODE:
431      case AlphaISA::IPR_MAF_MODE:
432        ipr[idx] = val & 0x3f;
433        break;
434
435      case AlphaISA::IPR_ITB_ASN:
436        ipr[idx] = val & 0x7f0;
437        break;
438
439      case AlphaISA::IPR_DTB_ASN:
440        ipr[idx] = val & ULL(0xfe00000000000000);
441        break;
442
443      case AlphaISA::IPR_EXC_SUM:
444      case AlphaISA::IPR_EXC_MASK:
445        // any write to this register clears it
446        ipr[idx] = 0;
447        break;
448
449      case AlphaISA::IPR_INTID:
450      case AlphaISA::IPR_SL_RCV:
451      case AlphaISA::IPR_MM_STAT:
452      case AlphaISA::IPR_ITB_PTE_TEMP:
453      case AlphaISA::IPR_DTB_PTE_TEMP:
454        // read-only registers
455        return Unimplemented_Opcode_Fault;
456
457      case AlphaISA::IPR_HWINT_CLR:
458      case AlphaISA::IPR_SL_XMIT:
459      case AlphaISA::IPR_DC_FLUSH:
460      case AlphaISA::IPR_IC_FLUSH:
461        // the following are write only
462        ipr[idx] = val;
463        break;
464
465      case AlphaISA::IPR_DTB_IA:
466        // really a control write
467        ipr[idx] = 0;
468
469        dtb->flushAll();
470        break;
471
472      case AlphaISA::IPR_DTB_IAP:
473        // really a control write
474        ipr[idx] = 0;
475
476        dtb->flushProcesses();
477        break;
478
479      case AlphaISA::IPR_DTB_IS:
480        // really a control write
481        ipr[idx] = val;
482
483        dtb->flushAddr(val, DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]));
484        break;
485
486      case AlphaISA::IPR_DTB_TAG: {
487          struct AlphaISA::PTE pte;
488
489          // FIXME: granularity hints NYI...
490          if (DTB_PTE_GH(ipr[AlphaISA::IPR_DTB_PTE]) != 0)
491              panic("PTE GH field != 0");
492
493          // write entire quad
494          ipr[idx] = val;
495
496          // construct PTE for new entry
497          pte.ppn = DTB_PTE_PPN(ipr[AlphaISA::IPR_DTB_PTE]);
498          pte.xre = DTB_PTE_XRE(ipr[AlphaISA::IPR_DTB_PTE]);
499          pte.xwe = DTB_PTE_XWE(ipr[AlphaISA::IPR_DTB_PTE]);
500          pte.fonr = DTB_PTE_FONR(ipr[AlphaISA::IPR_DTB_PTE]);
501          pte.fonw = DTB_PTE_FONW(ipr[AlphaISA::IPR_DTB_PTE]);
502          pte.asma = DTB_PTE_ASMA(ipr[AlphaISA::IPR_DTB_PTE]);
503          pte.asn = DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]);
504
505          // insert new TAG/PTE value into data TLB
506          dtb->insert(val, pte);
507      }
508        break;
509
510      case AlphaISA::IPR_ITB_PTE: {
511          struct AlphaISA::PTE pte;
512
513          // FIXME: granularity hints NYI...
514          if (ITB_PTE_GH(val) != 0)
515              panic("PTE GH field != 0");
516
517          // write entire quad
518          ipr[idx] = val;
519
520          // construct PTE for new entry
521          pte.ppn = ITB_PTE_PPN(val);
522          pte.xre = ITB_PTE_XRE(val);
523          pte.xwe = 0;
524          pte.fonr = ITB_PTE_FONR(val);
525          pte.fonw = ITB_PTE_FONW(val);
526          pte.asma = ITB_PTE_ASMA(val);
527          pte.asn = ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]);
528
529          // insert new TAG/PTE value into data TLB
530          itb->insert(ipr[AlphaISA::IPR_ITB_TAG], pte);
531      }
532        break;
533
534      case AlphaISA::IPR_ITB_IA:
535        // really a control write
536        ipr[idx] = 0;
537
538        itb->flushAll();
539        break;
540
541      case AlphaISA::IPR_ITB_IAP:
542        // really a control write
543        ipr[idx] = 0;
544
545        itb->flushProcesses();
546        break;
547
548      case AlphaISA::IPR_ITB_IS:
549        // really a control write
550        ipr[idx] = val;
551
552        itb->flushAddr(val, ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]));
553        break;
554
555      default:
556        // invalid IPR
557        return Unimplemented_Opcode_Fault;
558    }
559
560    // no error...
561    return No_Fault;
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
569ExecContext::simPalCheck(int palFunc)
570{
571    kernelStats.callpal(palFunc);
572
573    switch (palFunc) {
574      case PAL::halt:
575        halt();
576        if (--System::numSystemsRunning == 0)
577            new SimExitEvent("all cpus halted");
578        break;
579
580      case PAL::bpt:
581      case PAL::bugchk:
582        if (system->breakpoint())
583            return false;
584        break;
585    }
586
587    return true;
588}
589
590#endif // FULL_SYSTEM
591