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This patch properly sets the access permissions in all controllers. 'Busy' was used for all transient states, which is incorrect in lots of cases when we still hold a valid copy of the line and are able to handle a functional read. In the L2 controller these states were split to differentiate the access permissions: IFGXX -> IFGXX, IFGXXD IGMO -> IGMO, IGMOU IGMIOF -> IGMIOF, IGMIOFD Same for the dir. controller: IS -> IS, IS_M MM -> MM, MM_M The dir. controllers also has the states WBI/WBS for lines that have been queued for a writeback. In these states we hold the data in the TBE for replying to functional reads until the memory acks the write and we move to I or S. Other minor changes includes updated debug messages and asserts. Change-Id: Ie4f6eac3b4d2641ec91ac6b168a0a017f61c0d6f Signed-off-by: Tiago Mück <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21927 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Pouya Fotouhi <pfotouhi@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.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/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. 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/documentation/general_docs/building 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 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/documentation/general_docs/building for more details and options. 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. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.