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The TARGET_ISA variable would let you select one ISA from a list of possible ISAs. That has now been replaced with USE_ARM_ISA, USE_X86_ISA, etc, variables which are boolean on or off. That will allow any number of ISAs to be enabled or disabled individually. Enabling something other than exactly one of these will probably prevent you from getting a working gem5 binary, but those problems are being addressed in other, parallel change series. I decided to use the USE_ prefix since it was consistent with most other on/off variables we have in gem5. One noteable exception is the BUILD_GPU setting which, you could convincingly argue, is a better prefix than USE_. Another option would be to use CONFIG_, in anticipation of using a kconfig style config mechanism in gem5. It seemed premature to start using a CONFIG_ prefix here, and if we decide to switch to some other prefix like BUILD_, it should be a purposeful choice and not something somebody just starts using. Change-Id: I90fef2835aa4712782e6c1313fbf564d0ed45538 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52491 Tested-by: kokoro <noreply+kokoro@google.com> Maintainer: Gabe Black <gabe.black@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.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, 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 these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - 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 may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.