gem5/mem/physical.cc
Ali Saidi 93b271117f Panic if physical memory isn't connected to anything
send range change at init for all devices

dev/io_device.cc:
dev/io_device.hh:
    add init function for pio devices to sent status changes around
mem/physical.cc:
mem/physical.hh:
    Panic if physical memory isn't connected to anything

--HG--
extra : convert_revision : 4223d1c3c73522d1e196c218eb0084d238677ad9
2006-04-10 14:40:22 -04:00

363 lines
9.2 KiB
C++

/*
* 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 <cstdio>
#include <iostream>
#include <string>
#include "base/misc.hh"
#include "config/full_system.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)
: MemObject(n), base_addr(0), pmem_addr(NULL), port(NULL)
{
// 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);
MemResponseEvent* response = new MemResponseEvent(pkt, memoryPort);
response->schedule(curTick + lat);
return true;
}
Tick
PhysicalMemory::doAtomicAccess(Packet &pkt)
{
doFunctionalAccess(pkt);
return curTick + lat;
}
void
PhysicalMemory::doFunctionalAccess(Packet &pkt)
{
assert(pkt.addr + pkt.size < pmem_size);
switch (pkt.cmd) {
case Read:
memcpy(pkt.data, pmem_addr + pkt.addr - base_addr, pkt.size);
break;
case Write:
memcpy(pmem_addr + pkt.addr - base_addr, pkt.data, pkt.size);
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)
{
panic("??");
}
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;
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")
END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
CREATE_SIM_OBJECT(PhysicalMemory)
{
return new PhysicalMemory(getInstanceName());
}
REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)