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getArmSystem is the building block for a lot of ArmSystem getters a client can use to check for a specific feature. This method is called very often during simulation and it is basically casting a System pointer into an ArmSystem pointer. To do so, it is using dynamic casting to check if the system is really an ArmSystem. This is very expensive and usually not needed. The only chance arm code would use a non ArmSystem is when in SE mode. But if that's the case, we can just replace the assertion with a assert(FullSystem). Testing Linux boot with this patch provides a speedup of nearly 2x! (atomic mode). This is partially related to: JIRA: https://gem5.atlassian.net/browse/GEM5-337 Since the PAuth patch changed the purifyTagged helper (on the critical path of simulation) to rely more heavilly on getArmSystem (via ArmSystem:: static methods) Change-Id: Idbf079548ffe03513b4fc58c76f0d69613952a50 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Ciro Santilli <ciro.santilli@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25964 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.