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;

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257 } else {
258 _status = DcacheWaitResponse;
259 // memory system takes ownership of packet
260 dcache_pkt = NULL;
261 }
262 return dcache_pkt == NULL;
263}
264
265Fault
266TimingSimpleCPU::buildSplitPacket(PacketPtr &pkt1, PacketPtr &pkt2,
267 RequestPtr &req, Addr split_addr, uint8_t *data, bool read)
268{
269 Fault fault;
270 RequestPtr req1, req2;
271 assert(!req->isLocked() && !req->isSwap());
272 req->splitOnVaddr(split_addr, req1, req2);
273
274 pkt1 = pkt2 = NULL;
275 if ((fault = buildPacket(pkt1, req1, read)) != NoFault ||
276 (fault = buildPacket(pkt2, req2, read)) != NoFault) {
277 delete req;
278 delete pkt1;
279 req = NULL;
280 pkt1 = NULL;
281 return fault;
282 }
283
284 assert(!req1->isMmapedIpr() && !req2->isMmapedIpr());
285
286 req->setPhys(req1->getPaddr(), req->getSize(), req1->getFlags());
287 PacketPtr pkt = new Packet(req, pkt1->cmd.responseCommand(),
288 Packet::Broadcast);
289
290 pkt->dataDynamic<uint8_t>(data);
291 pkt1->dataStatic<uint8_t>(data);
292 pkt2->dataStatic<uint8_t>(data + req1->getSize());
293
294 SplitMainSenderState * main_send_state = new SplitMainSenderState;
295 pkt->senderState = main_send_state;
296 main_send_state->fragments[0] = pkt1;
297 main_send_state->fragments[1] = pkt2;
298 main_send_state->outstanding = 2;
299 pkt1->senderState = new SplitFragmentSenderState(pkt, 0);
300 pkt2->senderState = new SplitFragmentSenderState(pkt, 1);
301 return fault;
302}
303
304Fault
305TimingSimpleCPU::buildPacket(PacketPtr &pkt, RequestPtr &req, bool read)
306{
307 Fault fault = read ? thread->translateDataReadReq(req) :
308 thread->translateDataWriteReq(req);
309 MemCmd cmd;
310 if (fault != NoFault) {
311 delete req;
312 req = NULL;
313 pkt = NULL;
314 return fault;
315 } else if (read) {
316 cmd = MemCmd::ReadReq;
317 if (req->isLocked())
318 cmd = MemCmd::LoadLockedReq;
319 } else {
320 cmd = MemCmd::WriteReq;
321 if (req->isLocked()) {
322 cmd = MemCmd::StoreCondReq;
323 } else if (req->isSwap()) {
324 cmd = MemCmd::SwapReq;
325 }
326 }
327 pkt = new Packet(req, cmd, Packet::Broadcast);
328 return NoFault;
329}
330
331template <class T>
332Fault
333TimingSimpleCPU::read(Addr addr, T &data, unsigned flags)
334{
335 Fault fault;
336 const int asid = 0;
337 const int thread_id = 0;
338 const Addr pc = thread->readPC();
339 int block_size = dcachePort.peerBlockSize();
340 int data_size = sizeof(T);
341
342 PacketPtr pkt;
343 RequestPtr req = new Request(asid, addr, data_size,
344 flags, pc, _cpuId, thread_id);
345
346 Addr split_addr = roundDown(addr + data_size - 1, block_size);
347 assert(split_addr <= addr || split_addr - addr < block_size);
348
349 if (split_addr > addr) {
350 PacketPtr pkt1, pkt2;
351 this->buildSplitPacket(pkt1, pkt2, req,
352 split_addr, (uint8_t *)(new T), true);
353 if (handleReadPacket(pkt1)) {
354 SplitFragmentSenderState * send_state =
355 dynamic_cast<SplitFragmentSenderState *>(pkt1->senderState);
356 send_state->clearFromParent();
357 if (handleReadPacket(pkt2)) {
358 send_state =
359 dynamic_cast<SplitFragmentSenderState *>(pkt1->senderState);
360 send_state->clearFromParent();
361 }
362 }
363 } else {
364 Fault fault = buildPacket(pkt, req, true);
365 if (fault != NoFault) {
366 return fault;
367 }
368 pkt->dataDynamic<T>(new T);
369
370 handleReadPacket(pkt);
371 }
372
373 if (traceData) {
374 traceData->setData(data);
375 traceData->setAddr(addr);

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473}
474
475template <class T>
476Fault
477TimingSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
478{
479 const int asid = 0;
480 const int thread_id = 0;
481 const Addr pc = thread->readPC();
482 int block_size = dcachePort.peerBlockSize();
483 int data_size = sizeof(T);
484
485 RequestPtr req = new Request(asid, addr, data_size,
486 flags, pc, _cpuId, thread_id);
487
488 Addr split_addr = roundDown(addr + data_size - 1, block_size);
489 assert(split_addr <= addr || split_addr - addr < block_size);
490
491 if (split_addr > addr) {
492 PacketPtr pkt1, pkt2;
493 T *dataP = new T;
494 *dataP = data;
495 Fault fault = this->buildSplitPacket(pkt1, pkt2, req, split_addr,
496 (uint8_t *)dataP, false);
497 if (fault != NoFault)
498 return fault;
499 dcache_pkt = pkt1;
500 if (handleWritePacket()) {
501 SplitFragmentSenderState * send_state =
502 dynamic_cast<SplitFragmentSenderState *>(pkt1->senderState);
503 send_state->clearFromParent();
504 dcache_pkt = pkt2;
505 if (handleReadPacket(pkt2)) {
506 send_state =
507 dynamic_cast<SplitFragmentSenderState *>(pkt1->senderState);
508 send_state->clearFromParent();
509 }
510 }
511 } else {
512 bool do_access = true; // flag to suppress cache access
513
514 Fault fault = buildPacket(dcache_pkt, req, false);
515 if (fault != NoFault)
516 return fault;
517
518 if (req->isLocked()) {
519 do_access = TheISA::handleLockedWrite(thread, req);
520 } else if (req->isCondSwap()) {
521 assert(res);
522 req->setExtraData(*res);
523 }
524
525 dcache_pkt->allocate();
526 if (req->isMmapedIpr())
527 dcache_pkt->set(htog(data));
528 else
529 dcache_pkt->set(data);
530
531 if (do_access)
532 handleWritePacket();

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