gem5/dev/disk_image.cc
Nathan Binkert 667cbb6690 Implement more m5 pseduo opcodes:
resetstats
dumpstats
dumpresetstats
m5checkpoint

Lots of cleanup of serialization and stats dumping/resetting to
work with these new instructions

arch/alpha/isa_desc:
    Implement more m5 pseduo opcodes:
    resetstats
    dumpstats
    dumpresetstats
    m5checkpoint

    All of these functions take two optional parameters, the first is a delay,
    and the second is a period.  The delay tells the simulator to wait the
    specified number of nanoseconds before triggering the event, the period
    tells the simulator to repeat the event with a specified frequency
base/statistics.cc:
base/statistics.hh:
    regReset RegResetCallback
dev/disk_image.cc:
    serializeFilename -> CheckpointFile()
sim/debug.cc:
    Move this debugging statement to sim_stats.cc
sim/eventq.cc:
    Don't AutoDelete an event if it is scheduled since the process()
    function could potentially schedule the event again.
sim/main.cc:
    DumpStatsEvent is now Statistics::SetupEvent(Dump, curTick)
sim/serialize.cc:
    Change the serialize event so that it's possible to cause the
    event to repeat.  Also make the priority such that the event
    happens just before the simulator would exit if both events
    were scheduled for the same cycle.

    get rid of the serializeFilename variable and provide a CheckpointFile()
    function.  This function takes a basename that is set in the
    configuration, and appends the current cycle to the name so that
    multiple checkpoints can be dumped from the same simulation.

    Also, don't exit the simulation when a checkpoint file is dumped.
sim/serialize.hh:
    serializeFilename -> CheckpointFile()
    SetupCheckpoint function to tell the simulator to prepare
    to checkpoint at a certain time with a certain period
sim/sim_events.cc:
    DumpStatsEvent stuff gets move to sim_stats.(cc|hh)
    The context stuff gets moved into the already existing
    stats context in stat_context.cc
sim/sim_events.hh:
    DumpStatsEvent stuff gets move to sim_stats.(cc|hh)
sim/universe.cc:
    Provide some simple functions for converting times into
    ticks.  These use floating point math to get as close as
    possible to the real values.  Multipliers are set up ahead
    of time

--HG--
extra : convert_revision : d06ef26a9237529a1e5060cb1ac2dcc04d4ec252
2003-11-02 18:02:58 -05:00

450 lines
11 KiB
C++

/*
* Copyright (c) 2003 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.
*/
/* @file
* Disk Image Definitions
*/
#include <sys/types.h>
#include <sys/uio.h>
#include <errno.h>
#include <unistd.h>
#include <cstdio>
#include <cstring>
#include <fstream>
#include <string>
#include "base/callback.hh"
#include "base/misc.hh"
#include "base/trace.hh"
#include "dev/disk_image.hh"
#include "sim/builder.hh"
#include "sim/sim_exit.hh"
using namespace std;
////////////////////////////////////////////////////////////////////////
//
// Raw Disk image
//
RawDiskImage::RawDiskImage(const string &name, const string &filename,
bool rd_only)
: DiskImage(name), disk_size(0)
{ open(filename, rd_only); }
RawDiskImage::~RawDiskImage()
{ close(); }
void
RawDiskImage::open(const string &filename, bool rd_only)
{
if (!filename.empty()) {
initialized = true;
readonly = rd_only;
file = filename;
ios::openmode mode = ios::in | ios::binary;
if (!readonly)
mode |= ios::out;
stream.open(file.c_str(), mode);
if (!stream.is_open())
panic("Error opening %s", filename);
}
}
void
RawDiskImage::close()
{
stream.close();
}
off_t
RawDiskImage::size() const
{
if (disk_size == 0) {
if (!stream.is_open())
panic("file not open!\n");
stream.seekg(0, ios::end);
disk_size = stream.tellg();
}
return disk_size / SectorSize;
}
off_t
RawDiskImage::read(uint8_t *data, off_t offset) const
{
if (!initialized)
panic("RawDiskImage not initialized");
if (!stream.is_open())
panic("file not open!\n");
if (stream.seekg(offset * SectorSize, ios::beg) < 0)
panic("Could not seek to location in file");
off_t pos = stream.tellg();
stream.read((char *)data, SectorSize);
DPRINTF(DiskImageRead, "read: offset=%d\n", (uint64_t)offset);
DDUMP(DiskImageRead, data, SectorSize);
return stream.tellg() - pos;
}
off_t
RawDiskImage::write(const uint8_t *data, off_t offset)
{
if (!initialized)
panic("RawDiskImage not initialized");
if (readonly)
panic("Cannot write to a read only disk image");
if (!stream.is_open())
panic("file not open!\n");
if (stream.seekp(offset * SectorSize, ios::beg) < 0)
panic("Could not seek to location in file");
DPRINTF(DiskImageWrite, "write: offset=%d\n", (uint64_t)offset);
DDUMP(DiskImageWrite, data, SectorSize);
off_t pos = stream.tellp();
stream.write((const char *)data, SectorSize);
return stream.tellp() - pos;
}
DEFINE_SIM_OBJECT_CLASS_NAME("DiskImage", DiskImage)
BEGIN_DECLARE_SIM_OBJECT_PARAMS(RawDiskImage)
Param<string> image_file;
Param<bool> read_only;
END_DECLARE_SIM_OBJECT_PARAMS(RawDiskImage)
BEGIN_INIT_SIM_OBJECT_PARAMS(RawDiskImage)
INIT_PARAM(image_file, "disk image file"),
INIT_PARAM_DFLT(read_only, "read only image", false)
END_INIT_SIM_OBJECT_PARAMS(RawDiskImage)
CREATE_SIM_OBJECT(RawDiskImage)
{
return new RawDiskImage(getInstanceName(), image_file, read_only);
}
REGISTER_SIM_OBJECT("RawDiskImage", RawDiskImage)
////////////////////////////////////////////////////////////////////////
//
// Copy on Write Disk image
//
const int CowDiskImage::VersionMajor = 1;
const int CowDiskImage::VersionMinor = 0;
CowDiskImage::CowDiskImage(const string &name, DiskImage *kid, int hash_size)
: DiskImage(name), child(kid), table(NULL)
{ init(hash_size); }
class CowDiskCallback : public Callback
{
private:
CowDiskImage *image;
public:
CowDiskCallback(CowDiskImage *i) : image(i) {}
void process() { image->save(); delete this; }
};
CowDiskImage::CowDiskImage(const string &name, DiskImage *kid, int hash_size,
const string &file, bool read_only)
: DiskImage(name), filename(file), child(kid), table(NULL)
{
if (!open(filename)) {
assert(!read_only && "why have a non-existent read only file?");
init(hash_size);
}
if (!read_only)
registerExitCallback(new CowDiskCallback(this));
}
CowDiskImage::~CowDiskImage()
{
SectorTable::iterator i = table->begin();
SectorTable::iterator end = table->end();
while (i != end) {
delete (*i).second;
++i;
}
}
void
SafeRead(ifstream &stream, void *data, int count)
{
stream.read((char *)data, count);
if (!stream.is_open())
panic("file not open");
if (stream.eof())
panic("premature end-of-file");
if (stream.bad() || stream.fail())
panic("error reading cowdisk image");
}
template<class T>
void
SafeRead(ifstream &stream, T &data)
{ SafeRead(stream, &data, sizeof(data)); }
bool
CowDiskImage::open(const string &file)
{
ifstream stream(file.c_str());
if (!stream.is_open())
return false;
if (stream.fail() || stream.bad())
panic("Error opening %s", file);
uint64_t magic;
SafeRead(stream, magic);
if (memcmp(&magic, "COWDISK!", sizeof(magic)) != 0)
panic("Could not open %s: Invalid magic", file);
uint32_t major, minor;
SafeRead(stream, major);
SafeRead(stream, minor);
if (major != VersionMajor && minor != VersionMinor)
panic("Could not open %s: invalid version %d.%d != %d.%d",
file, major, minor, VersionMajor, VersionMinor);
uint64_t sector_count;
SafeRead(stream, sector_count);
table = new SectorTable(sector_count);
for (uint64_t i = 0; i < sector_count; i++) {
uint64_t offset;
SafeRead(stream, offset);
Sector *sector = new Sector;
SafeRead(stream, sector, sizeof(Sector));
assert(table->find(offset) == table->end());
(*table)[offset] = sector;
}
stream.close();
initialized = true;
return true;
}
void
CowDiskImage::init(int hash_size)
{
table = new SectorTable(hash_size);
initialized = true;
}
void
SafeWrite(ofstream &stream, const void *data, int count)
{
stream.write((const char *)data, count);
if (!stream.is_open())
panic("file not open");
if (stream.eof())
panic("premature end-of-file");
if (stream.bad() || stream.fail())
panic("error reading cowdisk image");
}
template<class T>
void
SafeWrite(ofstream &stream, const T &data)
{ SafeWrite(stream, &data, sizeof(data)); }
void
CowDiskImage::save()
{
save(filename);
}
void
CowDiskImage::save(const string &file)
{
if (!initialized)
panic("RawDiskImage not initialized");
ofstream stream(file.c_str());
if (!stream.is_open() || stream.fail() || stream.bad())
panic("Error opening %s", file);
uint64_t magic;
memcpy(&magic, "COWDISK!", sizeof(magic));
SafeWrite(stream, magic);
SafeWrite(stream, (uint32_t)VersionMajor);
SafeWrite(stream, (uint32_t)VersionMinor);
SafeWrite(stream, (uint64_t)table->size());
uint64_t size = table->size();
SectorTable::iterator iter = table->begin();
SectorTable::iterator end = table->end();
for (uint64_t i = 0; i < size; i++) {
if (iter == end)
panic("Incorrect Table Size during save of COW disk image");
SafeWrite(stream, (uint64_t)(*iter).first);
SafeWrite(stream, (*iter).second->data, sizeof(Sector));
++iter;
}
stream.close();
}
void
CowDiskImage::writeback()
{
SectorTable::iterator i = table->begin();
SectorTable::iterator end = table->end();
while (i != end) {
child->write((*i).second->data, (*i).first);
++i;
}
}
off_t
CowDiskImage::size() const
{ return child->size(); }
off_t
CowDiskImage::read(uint8_t *data, off_t offset) const
{
if (!initialized)
panic("CowDiskImage not initialized");
if (offset > size())
panic("access out of bounds");
SectorTable::const_iterator i = table->find(offset);
if (i == table->end())
return child->read(data, offset);
else {
memcpy(data, (*i).second->data, SectorSize);
DPRINTF(DiskImageRead, "read: offset=%d\n", (uint64_t)offset);
DDUMP(DiskImageRead, data, SectorSize);
return SectorSize;
}
}
off_t
CowDiskImage::write(const uint8_t *data, off_t offset)
{
if (!initialized)
panic("RawDiskImage not initialized");
if (offset > size())
panic("access out of bounds");
SectorTable::iterator i = table->find(offset);
if (i == table->end()) {
Sector *sector = new Sector;
memcpy(sector, data, SectorSize);
table->insert(make_pair(offset, sector));
} else {
memcpy((*i).second->data, data, SectorSize);
}
DPRINTF(DiskImageWrite, "write: offset=%d\n", (uint64_t)offset);
DDUMP(DiskImageWrite, data, SectorSize);
return SectorSize;
}
void
CowDiskImage::serialize(ostream &os)
{
string cowFilename = CheckpointFile() + "." + name() + ".cow";
SERIALIZE_SCALAR(cowFilename);
save(cowFilename);
}
void
CowDiskImage::unserialize(Checkpoint *cp, const string &section)
{
string cowFilename;
UNSERIALIZE_SCALAR(cowFilename);
open(cowFilename);
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(CowDiskImage)
SimObjectParam<DiskImage *> child;
Param<string> image_file;
Param<int> table_size;
Param<bool> read_only;
END_DECLARE_SIM_OBJECT_PARAMS(CowDiskImage)
BEGIN_INIT_SIM_OBJECT_PARAMS(CowDiskImage)
INIT_PARAM(child, "child image"),
INIT_PARAM_DFLT(image_file, "disk image file", ""),
INIT_PARAM_DFLT(table_size, "initial table size", 65536),
INIT_PARAM_DFLT(read_only, "don't write back to the copy-on-write file",
true)
END_INIT_SIM_OBJECT_PARAMS(CowDiskImage)
CREATE_SIM_OBJECT(CowDiskImage)
{
if (((string)image_file).empty())
return new CowDiskImage(getInstanceName(), child, table_size);
else
return new CowDiskImage(getInstanceName(), child, table_size,
image_file, read_only);
}
REGISTER_SIM_OBJECT("CowDiskImage", CowDiskImage)