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-rw-r--r--src/mem/abstract_mem.cc537
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diff --git a/src/mem/abstract_mem.cc b/src/mem/abstract_mem.cc
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+/*
+ * Copyright (c) 2010-2012 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) 2001-2005 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: Ron Dreslinski
+ * Ali Saidi
+ * Andreas Hansson
+ */
+
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/user.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <zlib.h>
+
+#include <cerrno>
+#include <cstdio>
+#include <iostream>
+#include <string>
+
+#include "arch/registers.hh"
+#include "config/the_isa.hh"
+#include "debug/LLSC.hh"
+#include "debug/MemoryAccess.hh"
+#include "mem/abstract_mem.hh"
+#include "mem/packet_access.hh"
+
+using namespace std;
+
+AbstractMemory::AbstractMemory(const Params *p) :
+ MemObject(p), range(params()->range), pmemAddr(NULL),
+ confTableReported(p->conf_table_reported), inAddrMap(p->in_addr_map)
+{
+ if (size() % TheISA::PageBytes != 0)
+ panic("Memory Size not divisible by page size\n");
+
+ if (params()->null)
+ return;
+
+ if (params()->file == "") {
+ int map_flags = MAP_ANON | MAP_PRIVATE;
+ pmemAddr = (uint8_t *)mmap(NULL, size(),
+ PROT_READ | PROT_WRITE, map_flags, -1, 0);
+ } else {
+ int map_flags = MAP_PRIVATE;
+ int fd = open(params()->file.c_str(), O_RDONLY);
+ long _size = lseek(fd, 0, SEEK_END);
+ if (_size != range.size()) {
+ warn("Specified size %d does not match file %s %d\n", range.size(),
+ params()->file, _size);
+ range = RangeSize(range.start, _size);
+ }
+ lseek(fd, 0, SEEK_SET);
+ pmemAddr = (uint8_t *)mmap(NULL, roundUp(_size, sysconf(_SC_PAGESIZE)),
+ PROT_READ | PROT_WRITE, map_flags, fd, 0);
+ }
+
+ if (pmemAddr == (void *)MAP_FAILED) {
+ perror("mmap");
+ if (params()->file == "")
+ fatal("Could not mmap!\n");
+ else
+ fatal("Could not find file: %s\n", params()->file);
+ }
+
+ //If requested, initialize all the memory to 0
+ if (p->zero)
+ memset(pmemAddr, 0, size());
+}
+
+
+AbstractMemory::~AbstractMemory()
+{
+ if (pmemAddr)
+ munmap((char*)pmemAddr, size());
+}
+
+void
+AbstractMemory::regStats()
+{
+ using namespace Stats;
+
+ bytesRead
+ .name(name() + ".bytes_read")
+ .desc("Number of bytes read from this memory")
+ ;
+ bytesInstRead
+ .name(name() + ".bytes_inst_read")
+ .desc("Number of instructions bytes read from this memory")
+ ;
+ bytesWritten
+ .name(name() + ".bytes_written")
+ .desc("Number of bytes written to this memory")
+ ;
+ numReads
+ .name(name() + ".num_reads")
+ .desc("Number of read requests responded to by this memory")
+ ;
+ numWrites
+ .name(name() + ".num_writes")
+ .desc("Number of write requests responded to by this memory")
+ ;
+ numOther
+ .name(name() + ".num_other")
+ .desc("Number of other requests responded to by this memory")
+ ;
+ bwRead
+ .name(name() + ".bw_read")
+ .desc("Total read bandwidth from this memory (bytes/s)")
+ .precision(0)
+ .prereq(bytesRead)
+ ;
+ bwInstRead
+ .name(name() + ".bw_inst_read")
+ .desc("Instruction read bandwidth from this memory (bytes/s)")
+ .precision(0)
+ .prereq(bytesInstRead)
+ ;
+ bwWrite
+ .name(name() + ".bw_write")
+ .desc("Write bandwidth from this memory (bytes/s)")
+ .precision(0)
+ .prereq(bytesWritten)
+ ;
+ bwTotal
+ .name(name() + ".bw_total")
+ .desc("Total bandwidth to/from this memory (bytes/s)")
+ .precision(0)
+ .prereq(bwTotal)
+ ;
+ bwRead = bytesRead / simSeconds;
+ bwInstRead = bytesInstRead / simSeconds;
+ bwWrite = bytesWritten / simSeconds;
+ bwTotal = (bytesRead + bytesWritten) / simSeconds;
+}
+
+Range<Addr>
+AbstractMemory::getAddrRange()
+{
+ return range;
+}
+
+// Add load-locked to tracking list. Should only be called if the
+// operation is a load and the LLSC flag is set.
+void
+AbstractMemory::trackLoadLocked(PacketPtr pkt)
+{
+ Request *req = pkt->req;
+ Addr paddr = LockedAddr::mask(req->getPaddr());
+
+ // first we check if we already have a locked addr for this
+ // xc. Since each xc only gets one, we just update the
+ // existing record with the new address.
+ list<LockedAddr>::iterator i;
+
+ for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) {
+ if (i->matchesContext(req)) {
+ DPRINTF(LLSC, "Modifying lock record: context %d addr %#x\n",
+ req->contextId(), paddr);
+ i->addr = paddr;
+ return;
+ }
+ }
+
+ // no record for this xc: need to allocate a new one
+ DPRINTF(LLSC, "Adding lock record: context %d addr %#x\n",
+ req->contextId(), paddr);
+ lockedAddrList.push_front(LockedAddr(req));
+}
+
+
+// Called on *writes* only... both regular stores and
+// store-conditional operations. Check for conventional stores which
+// conflict with locked addresses, and for success/failure of store
+// conditionals.
+bool
+AbstractMemory::checkLockedAddrList(PacketPtr pkt)
+{
+ Request *req = pkt->req;
+ Addr paddr = LockedAddr::mask(req->getPaddr());
+ bool isLLSC = pkt->isLLSC();
+
+ // Initialize return value. Non-conditional stores always
+ // succeed. Assume conditional stores will fail until proven
+ // otherwise.
+ bool success = !isLLSC;
+
+ // Iterate over list. Note that there could be multiple matching
+ // records, as more than one context could have done a load locked
+ // to this location.
+ list<LockedAddr>::iterator i = lockedAddrList.begin();
+
+ while (i != lockedAddrList.end()) {
+
+ if (i->addr == paddr) {
+ // we have a matching address
+
+ if (isLLSC && i->matchesContext(req)) {
+ // it's a store conditional, and as far as the memory
+ // system can tell, the requesting context's lock is
+ // still valid.
+ DPRINTF(LLSC, "StCond success: context %d addr %#x\n",
+ req->contextId(), paddr);
+ success = true;
+ }
+
+ // Get rid of our record of this lock and advance to next
+ DPRINTF(LLSC, "Erasing lock record: context %d addr %#x\n",
+ i->contextId, paddr);
+ i = lockedAddrList.erase(i);
+ }
+ else {
+ // no match: advance to next record
+ ++i;
+ }
+ }
+
+ if (isLLSC) {
+ req->setExtraData(success ? 1 : 0);
+ }
+
+ return success;
+}
+
+
+#if TRACING_ON
+
+#define CASE(A, T) \
+ case sizeof(T): \
+ DPRINTF(MemoryAccess,"%s of size %i on address 0x%x data 0x%x\n", \
+ A, pkt->getSize(), pkt->getAddr(), pkt->get<T>()); \
+ break
+
+
+#define TRACE_PACKET(A) \
+ do { \
+ switch (pkt->getSize()) { \
+ CASE(A, uint64_t); \
+ CASE(A, uint32_t); \
+ CASE(A, uint16_t); \
+ CASE(A, uint8_t); \
+ default: \
+ DPRINTF(MemoryAccess, "%s of size %i on address 0x%x\n", \
+ A, pkt->getSize(), pkt->getAddr()); \
+ DDUMP(MemoryAccess, pkt->getPtr<uint8_t>(), pkt->getSize());\
+ } \
+ } while (0)
+
+#else
+
+#define TRACE_PACKET(A)
+
+#endif
+
+void
+AbstractMemory::access(PacketPtr pkt)
+{
+ assert(pkt->getAddr() >= range.start &&
+ (pkt->getAddr() + pkt->getSize() - 1) <= range.end);
+
+ if (pkt->memInhibitAsserted()) {
+ DPRINTF(MemoryAccess, "mem inhibited on 0x%x: not responding\n",
+ pkt->getAddr());
+ return;
+ }
+
+ uint8_t *hostAddr = pmemAddr + pkt->getAddr() - range.start;
+
+ if (pkt->cmd == MemCmd::SwapReq) {
+ TheISA::IntReg overwrite_val;
+ bool overwrite_mem;
+ uint64_t condition_val64;
+ uint32_t condition_val32;
+
+ if (!pmemAddr)
+ panic("Swap only works if there is real memory (i.e. null=False)");
+ assert(sizeof(TheISA::IntReg) >= pkt->getSize());
+
+ overwrite_mem = true;
+ // keep a copy of our possible write value, and copy what is at the
+ // memory address into the packet
+ std::memcpy(&overwrite_val, pkt->getPtr<uint8_t>(), pkt->getSize());
+ std::memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
+
+ if (pkt->req->isCondSwap()) {
+ if (pkt->getSize() == sizeof(uint64_t)) {
+ condition_val64 = pkt->req->getExtraData();
+ overwrite_mem = !std::memcmp(&condition_val64, hostAddr,
+ sizeof(uint64_t));
+ } else if (pkt->getSize() == sizeof(uint32_t)) {
+ condition_val32 = (uint32_t)pkt->req->getExtraData();
+ overwrite_mem = !std::memcmp(&condition_val32, hostAddr,
+ sizeof(uint32_t));
+ } else
+ panic("Invalid size for conditional read/write\n");
+ }
+
+ if (overwrite_mem)
+ std::memcpy(hostAddr, &overwrite_val, pkt->getSize());
+
+ assert(!pkt->req->isInstFetch());
+ TRACE_PACKET("Read/Write");
+ numOther++;
+ } else if (pkt->isRead()) {
+ assert(!pkt->isWrite());
+ if (pkt->isLLSC()) {
+ trackLoadLocked(pkt);
+ }
+ if (pmemAddr)
+ memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
+ TRACE_PACKET(pkt->req->isInstFetch() ? "IFetch" : "Read");
+ numReads++;
+ bytesRead += pkt->getSize();
+ if (pkt->req->isInstFetch())
+ bytesInstRead += pkt->getSize();
+ } else if (pkt->isWrite()) {
+ if (writeOK(pkt)) {
+ if (pmemAddr)
+ memcpy(hostAddr, pkt->getPtr<uint8_t>(), pkt->getSize());
+ assert(!pkt->req->isInstFetch());
+ TRACE_PACKET("Write");
+ numWrites++;
+ bytesWritten += pkt->getSize();
+ }
+ } else if (pkt->isInvalidate()) {
+ // no need to do anything
+ } else {
+ panic("unimplemented");
+ }
+
+ if (pkt->needsResponse()) {
+ pkt->makeResponse();
+ }
+}
+
+void
+AbstractMemory::functionalAccess(PacketPtr pkt)
+{
+ assert(pkt->getAddr() >= range.start &&
+ (pkt->getAddr() + pkt->getSize() - 1) <= range.end);
+
+ uint8_t *hostAddr = pmemAddr + pkt->getAddr() - range.start;
+
+ if (pkt->isRead()) {
+ if (pmemAddr)
+ memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize());
+ TRACE_PACKET("Read");
+ pkt->makeResponse();
+ } else if (pkt->isWrite()) {
+ if (pmemAddr)
+ memcpy(hostAddr, pkt->getPtr<uint8_t>(), pkt->getSize());
+ TRACE_PACKET("Write");
+ pkt->makeResponse();
+ } else if (pkt->isPrint()) {
+ Packet::PrintReqState *prs =
+ dynamic_cast<Packet::PrintReqState*>(pkt->senderState);
+ // Need to call printLabels() explicitly since we're not going
+ // through printObj().
+ prs->printLabels();
+ // Right now we just print the single byte at the specified address.
+ ccprintf(prs->os, "%s%#x\n", prs->curPrefix(), *hostAddr);
+ } else {
+ panic("AbstractMemory: unimplemented functional command %s",
+ pkt->cmdString());
+ }
+}
+
+void
+AbstractMemory::serialize(ostream &os)
+{
+ if (!pmemAddr)
+ return;
+
+ gzFile compressedMem;
+ string filename = name() + ".physmem";
+ long _size = range.size();
+
+ SERIALIZE_SCALAR(filename);
+ SERIALIZE_SCALAR(_size);
+
+ // write memory file
+ string thefile = Checkpoint::dir() + "/" + filename.c_str();
+ int fd = creat(thefile.c_str(), 0664);
+ if (fd < 0) {
+ perror("creat");
+ fatal("Can't open physical memory checkpoint file '%s'\n", filename);
+ }
+
+ compressedMem = gzdopen(fd, "wb");
+ if (compressedMem == NULL)
+ fatal("Insufficient memory to allocate compression state for %s\n",
+ filename);
+
+ if (gzwrite(compressedMem, pmemAddr, size()) != (int)size()) {
+ fatal("Write failed on physical memory checkpoint file '%s'\n",
+ filename);
+ }
+
+ if (gzclose(compressedMem))
+ fatal("Close failed on physical memory checkpoint file '%s'\n",
+ filename);
+
+ list<LockedAddr>::iterator i = lockedAddrList.begin();
+
+ vector<Addr> lal_addr;
+ vector<int> lal_cid;
+ while (i != lockedAddrList.end()) {
+ lal_addr.push_back(i->addr);
+ lal_cid.push_back(i->contextId);
+ i++;
+ }
+ arrayParamOut(os, "lal_addr", lal_addr);
+ arrayParamOut(os, "lal_cid", lal_cid);
+}
+
+void
+AbstractMemory::unserialize(Checkpoint *cp, const string &section)
+{
+ if (!pmemAddr)
+ return;
+
+ gzFile compressedMem;
+ long *tempPage;
+ long *pmem_current;
+ uint64_t curSize;
+ uint32_t bytesRead;
+ const uint32_t chunkSize = 16384;
+
+ string filename;
+
+ UNSERIALIZE_SCALAR(filename);
+
+ filename = cp->cptDir + "/" + filename;
+
+ // mmap memoryfile
+ int fd = open(filename.c_str(), O_RDONLY);
+ if (fd < 0) {
+ perror("open");
+ fatal("Can't open physical memory checkpoint file '%s'", filename);
+ }
+
+ compressedMem = gzdopen(fd, "rb");
+ if (compressedMem == NULL)
+ fatal("Insufficient memory to allocate compression state for %s\n",
+ filename);
+
+ // unmap file that was mmapped in the constructor
+ // This is done here to make sure that gzip and open don't muck with our
+ // nice large space of memory before we reallocate it
+ munmap((char*)pmemAddr, size());
+
+ long _size;
+ UNSERIALIZE_SCALAR(_size);
+ if (_size > params()->range.size())
+ fatal("Memory size has changed! size %lld, param size %lld\n",
+ _size, params()->range.size());
+
+ pmemAddr = (uint8_t *)mmap(NULL, size(),
+ PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
+
+ if (pmemAddr == (void *)MAP_FAILED) {
+ perror("mmap");
+ fatal("Could not mmap physical memory!\n");
+ }
+
+ curSize = 0;
+ tempPage = (long*)malloc(chunkSize);
+ if (tempPage == NULL)
+ fatal("Unable to malloc memory to read file %s\n", filename);
+
+ /* Only copy bytes that are non-zero, so we don't give the VM system hell */
+ while (curSize < size()) {
+ bytesRead = gzread(compressedMem, tempPage, chunkSize);
+ if (bytesRead == 0)
+ break;
+
+ assert(bytesRead % sizeof(long) == 0);
+
+ for (uint32_t x = 0; x < bytesRead / sizeof(long); x++)
+ {
+ if (*(tempPage+x) != 0) {
+ pmem_current = (long*)(pmemAddr + curSize + x * sizeof(long));
+ *pmem_current = *(tempPage+x);
+ }
+ }
+ curSize += bytesRead;
+ }
+
+ free(tempPage);
+
+ if (gzclose(compressedMem))
+ fatal("Close failed on physical memory checkpoint file '%s'\n",
+ filename);
+
+ vector<Addr> lal_addr;
+ vector<int> lal_cid;
+ arrayParamIn(cp, section, "lal_addr", lal_addr);
+ arrayParamIn(cp, section, "lal_cid", lal_cid);
+ for(int i = 0; i < lal_addr.size(); i++)
+ lockedAddrList.push_front(LockedAddr(lal_addr[i], lal_cid[i]));
+}
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