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Trying to read MISCREG_CTR_EL0 on AArch64 returned 0 as is was not implmemented. With that an operating system relying on the cache line sizes reported in order to manage the caches would (a) panic given the returned value 0 is not valid (high bit is RES1) or (b) worst case would assume a cache line size of 4 doing a tremendous amount of extra instruction work (including fetching). Return the same values as for ARMv7 as the fields seem to be the same, or RES0/1 seem to be reported accordingly for AArch64 In collaboration with: Andrew Turner Testing Done: Checked on FreeBSD boots with extra printfs; also observed a reduction of a factor of about 10 in instruction fetches for a simple micro-test. Reviewed at http://reviews.gem5.org/r/3667/ Signed-off-by: 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.