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Ruby caches block incoming ports with messages on a locked address to make sure the line would not be replaced by others. But they do not check the lock upon capacity/conflict misses. This change adds a new slicc statement "check_on_cache_probe" which takes two arguments (mandatoryQueue for the controller, and the line subject to eviction - i.e. address returned by cacheProbe). If the line is locked, incoming message is delayed for 1 cycle and the controller skips this request (i.e. does not trigger an event). Coherence protocols should be updated accordingly. One use case for MESI Two Level will be added in a separate change. Signed-off-by: Pouya Fotouhi <pfotouhi@ucdavis.edu> Change-Id: I79ca2d45518de7a4e382b520a11f8e221b0cb803 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/16808 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Srikant Bharadwaj <srikant.bharadwaj@amd.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/Dependencies for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ALPHA, ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. The basic source release includes these subdirectories: - 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 If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.