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-rw-r--r--mem/physical.cc373
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diff --git a/mem/physical.cc b/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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