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-rw-r--r--src/mem/physical.cc373
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diff --git a/src/mem/physical.cc b/src/mem/physical.cc
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+/*
+ * 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.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <zlib.h>
+
+#include <iostream>
+#include <string>
+
+
+#include "base/misc.hh"
+#include "config/full_system.hh"
+#include "mem/packet_impl.hh"
+#include "mem/physical.hh"
+#include "sim/host.hh"
+#include "sim/builder.hh"
+#include "sim/eventq.hh"
+#include "arch/isa_traits.hh"
+
+
+using namespace std;
+using namespace TheISA;
+
+PhysicalMemory::MemResponseEvent::MemResponseEvent(Packet *pkt, MemoryPort* _m)
+ : Event(&mainEventQueue, CPU_Tick_Pri), pkt(pkt), memoryPort(_m)
+{
+
+ this->setFlags(AutoDelete);
+}
+
+void
+PhysicalMemory::MemResponseEvent::process()
+{
+ memoryPort->sendTiming(pkt);
+}
+
+const char *
+PhysicalMemory::MemResponseEvent::description()
+{
+ return "Physical Memory Timing Access respnse event";
+}
+
+PhysicalMemory::PhysicalMemory(const string &n, Tick latency)
+ : MemObject(n),base_addr(0), pmem_addr(NULL), port(NULL), lat(latency)
+{
+ // Hardcoded to 128 MB for now.
+ pmem_size = 1 << 27;
+
+ if (pmem_size % TheISA::PageBytes != 0)
+ panic("Memory Size not divisible by page size\n");
+
+ int map_flags = MAP_ANON | MAP_PRIVATE;
+ pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
+ map_flags, -1, 0);
+
+ if (pmem_addr == (void *)MAP_FAILED) {
+ perror("mmap");
+ fatal("Could not mmap!\n");
+ }
+
+ page_ptr = 0;
+}
+
+void
+PhysicalMemory::init()
+{
+ if (!port)
+ panic("PhysicalMemory not connected to anything!");
+ port->sendStatusChange(Port::RangeChange);
+}
+
+PhysicalMemory::~PhysicalMemory()
+{
+ if (pmem_addr)
+ munmap(pmem_addr, pmem_size);
+ //Remove memPorts?
+}
+
+Addr
+PhysicalMemory::new_page()
+{
+ Addr return_addr = page_ptr << LogVMPageSize;
+ return_addr += base_addr;
+
+ ++page_ptr;
+ return return_addr;
+}
+
+int
+PhysicalMemory::deviceBlockSize()
+{
+ //Can accept anysize request
+ return 0;
+}
+
+bool
+PhysicalMemory::doTimingAccess (Packet *pkt, MemoryPort* memoryPort)
+{
+ doFunctionalAccess(pkt);
+
+ pkt->dest = pkt->src;
+ MemResponseEvent* response = new MemResponseEvent(pkt, memoryPort);
+ response->schedule(curTick + lat);
+
+ return true;
+}
+
+Tick
+PhysicalMemory::doAtomicAccess(Packet *pkt)
+{
+ doFunctionalAccess(pkt);
+ pkt->time = curTick + lat;
+ return curTick + lat;
+}
+
+void
+PhysicalMemory::doFunctionalAccess(Packet *pkt)
+{
+ assert(pkt->addr + pkt->size < pmem_size);
+
+ switch (pkt->cmd) {
+ case Read:
+ memcpy(pkt->getPtr<uint8_t>(), pmem_addr + pkt->addr - base_addr,
+ pkt->size);
+ break;
+ case Write:
+ memcpy(pmem_addr + pkt->addr - base_addr, pkt->getPtr<uint8_t>(),
+ pkt->size);
+ // temporary hack: will need to add real LL/SC implementation
+ // for cacheless systems later.
+ if (pkt->req->getFlags() & LOCKED) {
+ pkt->req->setScResult(1);
+ }
+ break;
+ default:
+ panic("unimplemented");
+ }
+
+ pkt->result = Success;
+}
+
+Port *
+PhysicalMemory::getPort(const std::string &if_name)
+{
+ if (if_name == "") {
+ if (port != NULL)
+ panic("PhysicalMemory::getPort: additional port requested to memory!");
+ port = new MemoryPort(this);
+ return port;
+ } else if (if_name == "functional") {
+ /* special port for functional writes at startup. */
+ return new MemoryPort(this);
+ } else {
+ panic("PhysicalMemory::getPort: unknown port %s requested", if_name);
+ }
+}
+
+void
+PhysicalMemory::recvStatusChange(Port::Status status)
+{
+}
+
+PhysicalMemory::MemoryPort::MemoryPort(PhysicalMemory *_memory)
+ : memory(_memory)
+{ }
+
+void
+PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status)
+{
+ memory->recvStatusChange(status);
+}
+
+void
+PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp,
+ AddrRangeList &snoop)
+{
+ memory->getAddressRanges(resp, snoop);
+}
+
+void
+PhysicalMemory::getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
+{
+ snoop.clear();
+ resp.clear();
+ resp.push_back(RangeSize(base_addr, pmem_size));
+}
+
+int
+PhysicalMemory::MemoryPort::deviceBlockSize()
+{
+ return memory->deviceBlockSize();
+}
+
+bool
+PhysicalMemory::MemoryPort::recvTiming(Packet *pkt)
+{
+ return memory->doTimingAccess(pkt, this);
+}
+
+Tick
+PhysicalMemory::MemoryPort::recvAtomic(Packet *pkt)
+{
+ return memory->doAtomicAccess(pkt);
+}
+
+void
+PhysicalMemory::MemoryPort::recvFunctional(Packet *pkt)
+{
+ memory->doFunctionalAccess(pkt);
+}
+
+
+
+void
+PhysicalMemory::serialize(ostream &os)
+{
+ gzFile compressedMem;
+ string filename = name() + ".physmem";
+
+ SERIALIZE_SCALAR(pmem_size);
+ SERIALIZE_SCALAR(filename);
+
+ // 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, pmem_addr, pmem_size) != pmem_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);
+}
+
+void
+PhysicalMemory::unserialize(Checkpoint *cp, const string &section)
+{
+ gzFile compressedMem;
+ long *tempPage;
+ long *pmem_current;
+ uint64_t curSize;
+ uint32_t bytesRead;
+ const int chunkSize = 16384;
+
+
+ // unmap file that was mmaped in the constructor
+ munmap(pmem_addr, pmem_size);
+
+ string filename;
+
+ UNSERIALIZE_SCALAR(pmem_size);
+ 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);
+
+
+ pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_PRIVATE, -1, 0);
+
+ if (pmem_addr == (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 < pmem_size) {
+ bytesRead = gzread(compressedMem, tempPage, chunkSize);
+ if (bytesRead != chunkSize && bytesRead != pmem_size - curSize)
+ fatal("Read failed on physical memory checkpoint file '%s'"
+ " got %d bytes, expected %d or %d bytes\n",
+ filename, bytesRead, chunkSize, pmem_size-curSize);
+
+ assert(bytesRead % sizeof(long) == 0);
+
+ for (int x = 0; x < bytesRead/sizeof(long); x++)
+ {
+ if (*(tempPage+x) != 0) {
+ pmem_current = (long*)(pmem_addr + 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);
+
+}
+
+
+BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
+
+ Param<string> file;
+ Param<Range<Addr> > range;
+ Param<Tick> latency;
+
+END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
+
+BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
+
+ INIT_PARAM_DFLT(file, "memory mapped file", ""),
+ INIT_PARAM(range, "Device Address Range"),
+ INIT_PARAM(latency, "Memory access latency")
+
+END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
+
+CREATE_SIM_OBJECT(PhysicalMemory)
+{
+
+ return new PhysicalMemory(getInstanceName(), latency);
+}
+
+REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)
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