summaryrefslogtreecommitdiff
path: root/src/dev/arm/gic.cc
blob: eff7d94bb32b3cf3ba284bad14412b9b3b043c6a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
/*
 * Copyright (c) 2010 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Ali Saidi
 *          Prakash Ramrakhyani
 */

#include "base/trace.hh"
#include "cpu/intr_control.hh"
#include "dev/arm/gic.hh"
#include "dev/platform.hh"
#include "dev/terminal.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"

Gic::Gic(const Params *p)
    : PioDevice(p),distAddr(p->dist_addr), cpuAddr(p->cpu_addr),
      distPioDelay(p->dist_pio_delay), cpuPioDelay(p->cpu_pio_delay),
      enabled(false), itLines(p->it_lines)
{
    itLinesLog2 = ceilLog2(itLines);

    for (int x = 0; x < 8; x++) {
        cpuEnabled[x] = false;
        cpuPriority[x] = 0;
        cpuBpr[x] = 0;
        // Initialize cpu highest int
        cpuHighestInt[x] = SPURIOUS_INT;
    }

    for (int x = 0; x < 32; x++) {
        intEnabled[x] = 0;
        pendingInt[x] = 0;
        activeInt[x] = 0;
    }

    for (int x = 0; x < 1020; x++) {
        intPriority[x] = 0;
        cpuTarget[x] = 0;
    }

    for (int x = 0; x < 64; x++) {
        intConfig[x] = 0;
    }
}

Tick
Gic::read(PacketPtr pkt)
{

    Addr addr = pkt->getAddr();

    if (addr >= distAddr && addr < distAddr + DIST_SIZE)
        return readDistributor(pkt);
    else if (addr >= cpuAddr && addr < cpuAddr + CPU_SIZE)
        return readCpu(pkt);
    else
        panic("Read to unknown address %#x\n", pkt->getAddr());
}


Tick
Gic::write(PacketPtr pkt)
{

    Addr addr = pkt->getAddr();

    if (addr >= distAddr && addr < distAddr + DIST_SIZE)
        return writeDistributor(pkt);
    else if (addr >= cpuAddr && addr < cpuAddr + CPU_SIZE)
        return writeCpu(pkt);
    else
        panic("Write to unknown address %#x\n", pkt->getAddr());
}

Tick
Gic::readDistributor(PacketPtr pkt)
{
    Addr daddr = pkt->getAddr() - distAddr;
    pkt->allocate();

    DPRINTF(Interrupt, "gic distributor read register %#x\n", daddr);

    if (daddr >= ICDISER_ST && daddr < ICDISER_ED + 4) {
        assert((daddr-ICDISER_ST) >> 2 < 32);
        pkt->set<uint32_t>(intEnabled[(daddr-ICDISER_ST)>>2]);
        goto done;
    }

    if (daddr >= ICDICER_ST && daddr < ICDICER_ED + 4) {
        assert((daddr-ICDICER_ST) >> 2 < 32);
        pkt->set<uint32_t>(intEnabled[(daddr-ICDICER_ST)>>2]);
        goto done;
    }

    if (daddr >= ICDISPR_ST && daddr < ICDISPR_ED + 4) {
        assert((daddr-ICDISPR_ST) >> 2 < 32);
        pkt->set<uint32_t>(pendingInt[(daddr-ICDISPR_ST)>>2]);
        goto done;
    }

    if (daddr >= ICDICPR_ST && daddr < ICDICPR_ED + 4) {
        assert((daddr-ICDICPR_ST) >> 2 < 32);
        pkt->set<uint32_t>(pendingInt[(daddr-ICDICPR_ST)>>2]);
        goto done;
    }

    if (daddr >= ICDABR_ST && daddr < ICDABR_ED + 4) {
        assert((daddr-ICDABR_ST) >> 2 < 32);
        pkt->set<uint32_t>(activeInt[(daddr-ICDABR_ST)>>2]);
        goto done;
    }

    if (daddr >= ICDIPR_ST && daddr < ICDIPR_ED + 4) {
        Addr int_num;
        int_num = daddr - ICDIPR_ST;
        assert(int_num < 1020);
        DPRINTF(Interrupt, "Reading interrupt priority at int# %#x \n",int_num);
        switch(pkt->getSize()){
          case 1:
            pkt->set<uint8_t>(intPriority[int_num]);
            break;
          case 2:
            pkt->set<uint16_t>(intPriority[int_num] |
                               intPriority[int_num+1] << 8);
            break;
          case 4:
            pkt->set<uint32_t>(intPriority[int_num] |
                               intPriority[int_num+1] << 8 |
                               intPriority[int_num+2] << 16 |
                               intPriority[int_num+3] << 24);
            break;
          default:
            panic("Invalid access size while reading, priority registers in Gic: %d", pkt->getSize());
        }
        goto done;
    }

    if (daddr >= ICDIPTR_ST && daddr < ICDIPTR_ED + 4) {
        Addr int_num;
        int_num = (daddr-ICDIPTR_ST) << 2;
        assert(int_num < 1020);

        // First 31 interrupts only target single processor
        if (int_num > 31) {
            pkt->set<uint32_t>(cpuTarget[int_num] |
                               cpuTarget[int_num+1] << 8 |
                               cpuTarget[int_num+2] << 16 |
                               cpuTarget[int_num+3] << 24) ;
        } else {
            /** @todo should be processor id */
            pkt->set<uint32_t>(0);
        }
        goto done;
    }

    if (daddr >= ICDICFR_ST && daddr < ICDICFR_ED + 4) {
        assert((daddr-ICDICFR_ST) >> 2 < 64);
        /** @todo software generated interrutps and PPIs
         * can't be configured in some ways
         */
        pkt->set<uint32_t>(intConfig[(daddr-ICDICFR_ST)>>2]);
        goto done;
    }

    switch(daddr) {
      case ICDDCR:
        pkt->set<uint32_t>(enabled);
        break;
      case ICDICTR:
        /* @todo this needs to refelct the number of CPUs in the system */
        uint32_t tmp;
        tmp = 0 << 5 | // cpu number
              (itLines/32 -1);
        pkt->set<uint32_t>(tmp);
        break;
      default:
        panic("Tried to read Gic distributor at offset %#x\n", daddr);
        break;
    }
done:
    pkt->makeAtomicResponse();
    return distPioDelay;
}

Tick
Gic::readCpu(PacketPtr pkt)
{
    Addr daddr = pkt->getAddr() - cpuAddr;
    pkt->allocate();

    DPRINTF(Interrupt, "gic cpu read register %#x\n", daddr);

    switch(daddr) {
      case ICCICR:
        pkt->set<uint32_t>(cpuEnabled[0]);
        break;
      case ICCPMR:
        pkt->set<uint32_t>(cpuPriority[0]);
        break;
      case ICCBPR:
        pkt->set<uint32_t>(cpuBpr[0]);
        break;
      case ICCIAR:
        DPRINTF(Interrupt, "CPU reading IAR = %d\n", cpuHighestInt[0]);
        if(enabled && cpuEnabled[0]){
            pkt->set<uint32_t>(cpuHighestInt[0]);
            activeInt[intNumToWord(cpuHighestInt[0])] |=
                1 << intNumToBit(cpuHighestInt[0]);
            updateRunPri();
            pendingInt[intNumToWord(cpuHighestInt[0])] &=
                ~(1 << intNumToBit(cpuHighestInt[0]));
            cpuHighestInt[0] = SPURIOUS_INT;
            updateIntState(-1);
            platform->intrctrl->clear(0, ArmISA::INT_IRQ, 0);
        } else {
             pkt->set<uint32_t>(SPURIOUS_INT);
        }

        break;
      case ICCRPR:
        pkt->set<uint32_t>(iccrpr[0]);
        break;
      case ICCHPIR:
        pkt->set<uint32_t>(0);
        panic("Need to implement HPIR");
        break;
      default:
        panic("Tried to read Gic cpu at offset %#x\n", daddr);
        break;
    }
    pkt->makeAtomicResponse();
    return cpuPioDelay;
}


Tick
Gic::writeDistributor(PacketPtr pkt)
{
    Addr daddr = pkt->getAddr() - distAddr;
    pkt->allocate();

    DPRINTF(Interrupt, "gic distributor write register %#x size %#x\n",
            daddr, pkt->getSize());

    if (daddr >= ICDISER_ST && daddr < ICDISER_ED + 4) {
        assert((daddr-ICDISER_ST) >> 2 < 32);
        intEnabled[(daddr-ICDISER_ST)>>2] |= pkt->get<uint32_t>();
        goto done;
    }

    if (daddr >= ICDICER_ST && daddr < ICDICER_ED + 4) {
        assert((daddr-ICDICER_ST) >> 2 < 32);
        intEnabled[(daddr-ICDICER_ST)>>2] &= ~pkt->get<uint32_t>();
        goto done;
    }

    if (daddr >= ICDISPR_ST && daddr < ICDISPR_ED + 4) {
        assert((daddr-ICDISPR_ST) >> 2 < 32);
        pendingInt[(daddr-ICDISPR_ST)>>2] |= pkt->get<uint32_t>();
        updateIntState((daddr-ICDISPR_ST)>>2);
        goto done;
    }

    if (daddr >= ICDICPR_ST && daddr < ICDICPR_ED + 4) {
        assert((daddr-ICDICPR_ST) >> 2 < 32);
        pendingInt[(daddr-ICDICPR_ST)>>2] &= ~pkt->get<uint32_t>();
        updateIntState((daddr-ICDICPR_ST)>>2);
        goto done;
    }

    if (daddr >= ICDIPR_ST && daddr < ICDIPR_ED + 4) {
        Addr int_num = daddr - ICDIPR_ST;
        assert(int_num < 1020);
        uint32_t tmp;
        switch(pkt->getSize()){
          case 1:
            tmp = pkt->get<uint8_t>();
            intPriority[int_num] = tmp & 0xff;
            break;
          case 2:
            tmp = pkt->get<uint16_t>();
            intPriority[int_num] = tmp & 0xff;
            intPriority[int_num + 1] = (tmp >> 8) & 0xff;
            break;
          case 4:
            tmp = pkt->get<uint32_t>();
            intPriority[int_num] = tmp & 0xff;
            intPriority[int_num + 1] = (tmp >> 8) & 0xff;
            intPriority[int_num + 2] = (tmp >> 16) & 0xff;
            intPriority[int_num + 3] = (tmp >> 24) & 0xff;
            break;
          default:
            panic("Invalid access size while writing to, priority registers in Gic: %d", pkt->getSize());
        }

        updateIntState(-1);
        updateRunPri();
        goto done;
    }

    if (daddr >= ICDIPTR_ST && daddr < ICDIPTR_ED + 4) {
        Addr int_num = (daddr-ICDIPTR_ST) << 2;
        assert(int_num < 1020);

        // First 31 interrupts only target single processor
        if (int_num > 31) {
            uint32_t tmp = pkt->get<uint32_t>();
            cpuTarget[int_num] = tmp & 0xff;
            cpuTarget[int_num+1] = (tmp >> 8) & 0xff;
            cpuTarget[int_num+2] = (tmp >> 16) & 0xff;
            cpuTarget[int_num+3] = (tmp >> 24) & 0xff;
            updateIntState((daddr-ICDIPTR_ST)>>2);
        }
        goto done;
    }

    if (daddr >= ICDICFR_ST && daddr < ICDICFR_ED + 4) {
        assert((daddr-ICDICFR_ST) >> 2 < 64);
        intConfig[(daddr-ICDICFR_ST)>>2] = pkt->get<uint32_t>();
        goto done;
    }

    switch(daddr) {
      case ICDDCR:
        enabled = pkt->get<uint32_t>();
        DPRINTF(Interrupt, "Distributor enable flag set to = %d\n", enabled);
        break;
      case ICDSGIR:
        softInt(pkt->get<uint32_t>());
        break;
      default:
        panic("Tried to write Gic distributor at offset %#x\n", daddr);
        break;
    }

done:
    pkt->makeAtomicResponse();
    return distPioDelay;
}

Tick
Gic::writeCpu(PacketPtr pkt)
{
    Addr daddr = pkt->getAddr() - cpuAddr;
    pkt->allocate();

    DPRINTF(Interrupt, "gic cpu write register %#x val: %#x\n",
            daddr, pkt->get<uint32_t>());

    switch(daddr) {
      case ICCICR:
        cpuEnabled[0] = pkt->get<uint32_t>();
        updateIntState(-1);
        break;
      case ICCPMR:
        cpuPriority[0] = pkt->get<uint32_t>();
        updateIntState(-1);
        break;
      case ICCBPR:
        cpuBpr[0] = pkt->get<uint32_t>();
        updateIntState(-1);
        break;
      case ICCEOIR:
        uint32_t tmp;
        tmp = pkt->get<uint32_t>();
        if (!(activeInt[intNumToWord(tmp)] & (1 << intNumToBit(tmp))))
            panic("Done handling interrupt that isn't active?\n");
        activeInt[intNumToWord(tmp)] &= ~(1 << intNumToBit(tmp));
        updateRunPri();
        DPRINTF(Interrupt, "CPU done handling interrupt IAR = %d\n", tmp);
        break;
      default:
        panic("Tried to write Gic cpu at offset %#x\n", daddr);
        break;
    }
    pkt->makeAtomicResponse();
    return cpuPioDelay;
}

void
Gic::softInt(SWI swi)
{
    warn("Should be causing software interrupt");
}

void
Gic::updateIntState(int hint)
{
    /*@todo use hint to do less work. */
    int highest_int = SPURIOUS_INT;
    // Priorities below that set in ICCPMR can be ignored
    uint8_t highest_pri = cpuPriority[0];

    for (int x = 0; x < (itLines/32) ; x++) {
        if (intEnabled[x] & pendingInt[x]) {
            for (int y = 0; y < 32; y++) {
                if (bits(intEnabled[x], y) & bits(pendingInt[x], y))
                    if (intPriority[x*32+y] < highest_pri) {
                        highest_pri = intPriority[x*32+y];
                        highest_int = x*32 + y;
                    }
            }
        }
    }

    if (highest_int == SPURIOUS_INT)
        return;

    cpuHighestInt[0] = highest_int;


    /* @todo make this work for more than one cpu, need to handle 1:N, N:N
     * models */
    if (enabled && cpuEnabled[0] && (highest_pri < cpuPriority[0])) {
        /* @todo delay interrupt by some time to deal with calculation delay */
        /* @todo only interrupt if we've haven't already interrupted for this
         * int !!!!!!!!!! */
        DPRINTF(Interrupt, "Posting interrupt %d to cpu0\n", highest_int);
        platform->intrctrl->post(0, ArmISA::INT_IRQ, 0);
    }
}

void
Gic::updateRunPri()
{
    uint8_t maxPriority = 0xff;
    for (int i = 0 ; i < itLines ; i++){
        if ( activeInt[intNumToWord(i)] & (1 << intNumToBit(i))){
            if (intPriority[i] < maxPriority) maxPriority = intPriority[i];
        }
    }
    iccrpr[0] = maxPriority;
}
void
Gic::sendInt(uint32_t num)
{
    DPRINTF(Interrupt, "Received Interupt number %d\n", num);
    pendingInt[intNumToWord(num)] |= 1 << intNumToBit(num);
    updateIntState(intNumToWord(num));

}

void
Gic::clearInt(uint32_t number)
{
    /* @todo assume edge triggered only at the moment. Nothing to do. */
}

void
Gic::addressRanges(AddrRangeList &range_list)
{
    range_list.clear();
    range_list.push_back(RangeSize(distAddr, DIST_SIZE));
    range_list.push_back(RangeSize(cpuAddr, CPU_SIZE));
}


void
Gic::serialize(std::ostream &os)
{
    panic("Need to implement serialization\n");
}

void
Gic::unserialize(Checkpoint *cp, const std::string &section)
{
    panic("Need to implement serialization\n");
}

Gic *
GicParams::create()
{
    return new Gic(this);
}

/* Functions for debugging and testing */
void
Gic::driveSPI(unsigned int spiVect)
{
    DPRINTF(GIC, "Received SPI Vector:%x Enable: %d\n", spiVect, irqEnable);
    if( irqEnable && enabled ){
        pendingInt[1] |= spiVect;
        updateIntState(-1);
    }
}

void
Gic::driveIrqEn( bool state)
{
    irqEnable = state;
}

void
Gic::driveLegIRQ(bool state)
{
    if (irqEnable && !(!enabled && cpuEnabled[0])){
        if(state){
            DPRINTF(GIC, "Driving Legacy Irq\n");
            platform->intrctrl->post(0, ArmISA::INT_IRQ, 0);
        }
        else platform->intrctrl->clear(0, ArmISA::INT_IRQ, 0);
    }
}

void
Gic::driveLegFIQ(bool state)
{
    if (state)
        platform->intrctrl->post(0, ArmISA::INT_FIQ, 0);
    else platform->intrctrl->clear(0, ArmISA::INT_FIQ, 0);
}