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This was set by MIPS in two places, I think largely just because it was available. This flag refers to IPRs which are an Alpha concept. In the O3 CPU, IsIprAccess was used as a possible indicator to determine if an instruction IsSerializeBefore, but we've already got a flag for that. In the minor CPU, which hasn't been made to work with MIPS as far as I know, it was used in a condition but not mentioned in the comment alongside the condition. I think there it was added for the sake of Alpha. This change eliminates that flag and removes it from the O3 and minor CPUs. In the MIPS ISA description, the instructions that were marked as IsIprAccess have now been marked as IsSerializeBefore since, if there was a real reason for them to be marked as IsIprAccess, it would have been to get it them to work in O3, and there IsSerializeBefore gets equivalent behavior. Change-Id: Ia874cde12fa70b998d3e638458f13d69798d40b7 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33739 Maintainer: Gabe Black <gabeblack@google.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.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.