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We currently execute instructions in the guest and then handle any IO request right after we break out of the virtualized environment. This has the effect of executing IO requests in the exact same tick as the first instruction in the sequence that was just run. There seem to be cases where this simplification upsets some timing-sensitive devices. This changeset splits execute and IO (and other services) across multiple ticks. This is implemented by adding a separate RunningService state to the CPU state machine. When a VM requires service, it enters into this state and pending IO is then serviced in the future instead of immediately. The delay between getting the request and servicing it depends on the number of cycles executed in the guest, which allows other components to catch up with the CPU.
This is the gem5 simulator.
For detailed information about building the simulator and getting
started please refer to:
* The main website: http://www.gem5.org
* Documentation wiki: http://www.gem5.org/Documentation
* Doxygen generated: http://www.gem5.org/docs
* Tutorials: http://www.gem5.org/Tutorials
Specific pages of interest are:
http://www.gem5.org/Introduction
http://www.gem5.org/Build_System
http://www.gem5.org/Dependencies
http://www.gem5.org/Running_gem5
Short version:
External tools and required versions
To build gem5, you will need the following software:
g++ version 4.3 or newer.
Python, version 2.4 - 2.7 (we don't support Python 3.X). gem5 links in the
Python interpreter, so you need the Python header files and shared
library (e.g., /usr/lib/libpython2.4.so) in addition to the interpreter
executable. These may or may not be installed by default. For example,
on Debian/Ubuntu, you need the "python-dev" package in addition to the
"python" package. If you need a newer or different Python installation
but can't or don't want to upgrade the default Python on your system,
see http://www.gem5.org/Using_a_non-default_Python_installation
SCons, version 0.98.1 or newer. SCons is a powerful replacement for make.
If you don't have administrator privileges on your machine, you can use the
"scons-local" package to install scons in your m5 directory, or install SCons
in your home directory using the '--prefix=' option.
SWIG, version 1.3.34 or newer
zlib, any recent version. For Debian/Ubuntu, you will need the "zlib-dev" or
"zlib1g-dev" package to get the zlib.h header file as well as the library
itself.
m4, the macro processor.
4. In this directory, type 'scons build/<ARCH>/gem5.opt' where ARCH is one
of ALPHA, ARM, MIPS, POWER, SPARC, or X86. This will build an optimized version
of the gem5 binary (gem5.opt) for the the specified architecture.
If you have questions, please send mail to gem5-users@gem5.org
WHAT'S INCLUDED (AND NOT)
-------------------------
The basic source release includes these subdirectories:
- gem5:
- configs: example simulation configuration scripts
- ext: less-common external packages needed to build gem5
- src: source code of the gem5 simulator
- system: source for some optional system software for simulated systems
- tests: regression tests
- util: useful utility programs and files
To run full-system simulations, you will need compiled system firmware
(console and PALcode for Alpha), kernel binaries and one or more disk images.
Please see the gem5 download page for these items at http://www.gem5.org/Download