1/*
2 * Copyright (c) 2001-2005 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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39#include <iostream>
40#include <string>
41
42#include "arch/isa_traits.hh"
43#include "base/misc.hh"
44#include "config/full_system.hh"
45#include "mem/packet_access.hh"
46#include "mem/physical.hh"
47#include "sim/builder.hh"
48#include "sim/eventq.hh"
49#include "sim/host.hh"
50
51using namespace std;
52using namespace TheISA;
53
54PhysicalMemory::PhysicalMemory(Params *p)
55 : MemObject(p->name), pmemAddr(NULL), lat(p->latency), _params(p)
56{
57 if (params()->addrRange.size() % TheISA::PageBytes != 0)
58 panic("Memory Size not divisible by page size\n");
59
60 int map_flags = MAP_ANON | MAP_PRIVATE;
61 pmemAddr =
62 (uint8_t *)mmap(NULL, params()->addrRange.size(),
63 PROT_READ | PROT_WRITE, map_flags, -1, 0);
64
65 if (pmemAddr == (void *)MAP_FAILED) {
66 perror("mmap");
67 fatal("Could not mmap!\n");
68 }
69
70 //If requested, initialize all the memory to 0
71 if(params()->zero)
72 memset(pmemAddr, 0, params()->addrRange.size());
73
74 pagePtr = 0;
75}
76
77void
78PhysicalMemory::init()
79{
80 if (ports.size() == 0) {

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85 if (*pi)
86 (*pi)->sendStatusChange(Port::RangeChange);
87 }
88}
89
90PhysicalMemory::~PhysicalMemory()
91{
92 if (pmemAddr)
93 munmap((char*)pmemAddr, params()->addrRange.size());
94 //Remove memPorts?
95}
96
97Addr
98PhysicalMemory::new_page()
99{
100 Addr return_addr = pagePtr << LogVMPageSize;
101 return_addr += start();

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117 return lat;
118}
119
120
121
122// Add load-locked to tracking list. Should only be called if the
123// operation is a load and the LOCKED flag is set.
124void
125PhysicalMemory::trackLoadLocked(PacketPtr pkt)
126{
127 Request *req = pkt->req;
128 Addr paddr = LockedAddr::mask(req->getPaddr());
129
130 // first we check if we already have a locked addr for this
131 // xc. Since each xc only gets one, we just update the
132 // existing record with the new address.
133 list<LockedAddr>::iterator i;
134
135 for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) {

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148}
149
150
151// Called on *writes* only... both regular stores and
152// store-conditional operations. Check for conventional stores which
153// conflict with locked addresses, and for success/failure of store
154// conditionals.
155bool
156PhysicalMemory::checkLockedAddrList(PacketPtr pkt)
157{
158 Request *req = pkt->req;
159 Addr paddr = LockedAddr::mask(req->getPaddr());
160 bool isLocked = pkt->isLocked();
161
162 // Initialize return value. Non-conditional stores always
163 // succeed. Assume conditional stores will fail until proven
164 // otherwise.
165 bool success = !isLocked;
166
167 // Iterate over list. Note that there could be multiple matching
168 // records, as more than one context could have done a load locked

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196
197 if (isLocked) {
198 req->setExtraData(success ? 1 : 0);
199 }
200
201 return success;
202}
203
204
205#if TRACING_ON
206
207#define CASE(A, T) \
208 case sizeof(T): \
209 DPRINTF(MemoryAccess, A " of size %i on address 0x%x data 0x%x\n", \
210 pkt->getSize(), pkt->getAddr(), pkt->get<T>()); \
211 break
212
213
214#define TRACE_PACKET(A) \
215 do { \
216 switch (pkt->getSize()) { \
217 CASE(A, uint64_t); \
218 CASE(A, uint32_t); \
219 CASE(A, uint16_t); \
220 CASE(A, uint8_t); \
221 default: \
222 DPRINTF(MemoryAccess, A " of size %i on address 0x%x\n", \
223 pkt->getSize(), pkt->getAddr()); \
224 } \
225 } while (0)
226
227#else
228
229#define TRACE_PACKET(A)
230
231#endif
232
233Tick
234PhysicalMemory::doAtomicAccess(PacketPtr pkt)
235{
236 assert(pkt->getAddr() >= start() &&
237 pkt->getAddr() + pkt->getSize() <= start() + size());
238
239 if (pkt->memInhibitAsserted()) {
240 DPRINTF(MemoryAccess, "mem inhibited on 0x%x: not responding\n",
241 pkt->getAddr());
242 return 0;
243 }
244
245 uint8_t *hostAddr = pmemAddr + pkt->getAddr() - start();
246
247 if (pkt->cmd == MemCmd::SwapReq) {
248 IntReg overwrite_val;
249 bool overwrite_mem;
250 uint64_t condition_val64;
251 uint32_t condition_val32;
252
253 assert(sizeof(IntReg) >= pkt->getSize());
254
255 overwrite_mem = true;
256 // keep a copy of our possible write value, and copy what is at the
257 // memory address into the packet
258 std::memcpy(&overwrite_val, pkt->getPtr<uint8_t>(), pkt->getSize());
259 std::memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
260
261 if (pkt->req->isCondSwap()) {
262 if (pkt->getSize() == sizeof(uint64_t)) {
263 condition_val64 = pkt->req->getExtraData();
264 overwrite_mem = !std::memcmp(&condition_val64, hostAddr,
265 sizeof(uint64_t));
266 } else if (pkt->getSize() == sizeof(uint32_t)) {
267 condition_val32 = (uint32_t)pkt->req->getExtraData();
268 overwrite_mem = !std::memcmp(&condition_val32, hostAddr,
269 sizeof(uint32_t));
270 } else
271 panic("Invalid size for conditional read/write\n");
272 }
273
274 if (overwrite_mem)
275 std::memcpy(hostAddr, &overwrite_val, pkt->getSize());
276
277 TRACE_PACKET("Read/Write");
278 } else if (pkt->isRead()) {
279 assert(!pkt->isWrite());
280 if (pkt->isLocked()) {
281 trackLoadLocked(pkt);
282 }
283 memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
284 TRACE_PACKET("Read");
285 } else if (pkt->isWrite()) {
286 if (writeOK(pkt)) {
287 memcpy(hostAddr, pkt->getPtr<uint8_t>(), pkt->getSize());
288 TRACE_PACKET("Write");
289 }
290 } else if (pkt->isInvalidate()) {
291 //upgrade or invalidate
292 if (pkt->needsResponse()) {
293 pkt->makeAtomicResponse();
294 }
295 } else {
296 panic("unimplemented");
297 }
298
299 if (pkt->needsResponse()) {
300 pkt->makeAtomicResponse();
301 }
302 return calculateLatency(pkt);
303}
304
305
306void
307PhysicalMemory::doFunctionalAccess(PacketPtr pkt)
308{
309 assert(pkt->getAddr() >= start() &&
310 pkt->getAddr() + pkt->getSize() <= start() + size());
311
312 uint8_t *hostAddr = pmemAddr + pkt->getAddr() - start();
313
314 if (pkt->cmd == MemCmd::ReadReq) {
315 memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
316 TRACE_PACKET("Read");
317 } else if (pkt->cmd == MemCmd::WriteReq) {
318 memcpy(hostAddr, pkt->getPtr<uint8_t>(), pkt->getSize());
319 TRACE_PACKET("Write");
320 } else {
321 panic("PhysicalMemory: unimplemented functional command %s",
322 pkt->cmdString());
323 }
324
325 pkt->makeAtomicResponse();
326}
327
328
329Port *
330PhysicalMemory::getPort(const std::string &if_name, int idx)
331{
332 // Accept request for "functional" port for backwards compatibility
333 // with places where this function is called from C++. I'd prefer
334 // to move all these into Python someday.
335 if (if_name == "functional") {
336 return new MemoryPort(csprintf("%s-functional", name()), this);

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379 memory->getAddressRanges(resp, snoop);
380}
381
382void
383PhysicalMemory::getAddressRanges(AddrRangeList &resp, bool &snoop)
384{
385 snoop = false;
386 resp.clear();
387 resp.push_back(RangeSize(start(), params()->addrRange.size()));
388}
389
390int
391PhysicalMemory::MemoryPort::deviceBlockSize()
392{
393 return memory->deviceBlockSize();
394}
395
396Tick
397PhysicalMemory::MemoryPort::recvAtomic(PacketPtr pkt)
398{
399 return memory->doAtomicAccess(pkt);
400}
401
402void
403PhysicalMemory::MemoryPort::recvFunctional(PacketPtr pkt)
404{
405 checkFunctional(pkt);
406
407 // Default implementation of SimpleTimingPort::recvFunctional()

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441 fatal("Can't open physical memory checkpoint file '%s'\n", filename);
442 }
443
444 compressedMem = gzdopen(fd, "wb");
445 if (compressedMem == NULL)
446 fatal("Insufficient memory to allocate compression state for %s\n",
447 filename);
448
449 if (gzwrite(compressedMem, pmemAddr, params()->addrRange.size()) != params()->addrRange.size()) {
450 fatal("Write failed on physical memory checkpoint file '%s'\n",
451 filename);
452 }
453
454 if (gzclose(compressedMem))
455 fatal("Close failed on physical memory checkpoint file '%s'\n",
456 filename);
457}

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483 compressedMem = gzdopen(fd, "rb");
484 if (compressedMem == NULL)
485 fatal("Insufficient memory to allocate compression state for %s\n",
486 filename);
487
488 // unmap file that was mmaped in the constructor
489 // This is done here to make sure that gzip and open don't muck with our
490 // nice large space of memory before we reallocate it
491 munmap((char*)pmemAddr, params()->addrRange.size());
492
493 pmemAddr = (uint8_t *)mmap(NULL, params()->addrRange.size(), PROT_READ | PROT_WRITE,
494 MAP_ANON | MAP_PRIVATE, -1, 0);
495
496 if (pmemAddr == (void *)MAP_FAILED) {
497 perror("mmap");
498 fatal("Could not mmap physical memory!\n");
499 }
500
501 curSize = 0;
502 tempPage = (long*)malloc(chunkSize);
503 if (tempPage == NULL)
504 fatal("Unable to malloc memory to read file %s\n", filename);
505
506 /* Only copy bytes that are non-zero, so we don't give the VM system hell */
507 while (curSize < params()->addrRange.size()) {
508 bytesRead = gzread(compressedMem, tempPage, chunkSize);
509 if (bytesRead != chunkSize && bytesRead != params()->addrRange.size() - curSize)
510 fatal("Read failed on physical memory checkpoint file '%s'"
511 " got %d bytes, expected %d or %d bytes\n",
512 filename, bytesRead, chunkSize, params()->addrRange.size()-curSize);
513
514 assert(bytesRead % sizeof(long) == 0);
515
516 for (int x = 0; x < bytesRead/sizeof(long); x++)
517 {
518 if (*(tempPage+x) != 0) {
519 pmem_current = (long*)(pmemAddr + curSize + x * sizeof(long));
520 *pmem_current = *(tempPage+x);

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526 free(tempPage);
527
528 if (gzclose(compressedMem))
529 fatal("Close failed on physical memory checkpoint file '%s'\n",
530 filename);
531
532}
533
534
535BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
536
537 Param<string> file;
538 Param<Range<Addr> > range;
539 Param<Tick> latency;
540 Param<bool> zero;
541
542END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
543
544BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
545
546 INIT_PARAM_DFLT(file, "memory mapped file", ""),
547 INIT_PARAM(range, "Device Address Range"),
548 INIT_PARAM(latency, "Memory access latency"),
549 INIT_PARAM(zero, "Zero initialize memory")
550
551END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
552
553CREATE_SIM_OBJECT(PhysicalMemory)
554{
555 PhysicalMemory::Params *p = new PhysicalMemory::Params;
556 p->name = getInstanceName();
557 p->addrRange = range;
558 p->latency = latency;
559 p->zero = zero;
560 return new PhysicalMemory(p);
561}
562
563REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)