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This class helps translate a region of memory one chunk at a time. The generator returns an iterator through its begin and end methods which can be used as part of a regular for loop, or as part of a range based for loop. The iterator points to a Range object which holds the virtual and physical address of the translation, the size of the region included in the translation, and a Fault if the translation of that chunk faulted. When incrementing the iterator, if there was no fault it simply moves ahead to the next region and attempts to translate it using a virtual method implemented by subclasses. It's up to the subclass to determine if there is now a fault, how many bytes have been translated if, for instance, the page size is variable, and what the translated physical address is. If there was a fault, the iterator does not increment, it just clears the fault and tries the previous translation again. This gives consumers of the translation generator a chance to fix up faulting addresses without having to abort the whole process and try again. This might be useful if, for instance, you've reached the end of the stack and a new page needs to be demand-paged in. Change-Id: I8c4023845d989fe3781b1b73ab12f7c8855c9171 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50758 Reviewed-by: Gabe Black <gabe.black@gmail.com> Reviewed-by: Matthew Poremba <matthew.poremba@amd.com> Maintainer: Gabe Black <gabe.black@gmail.com> 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, 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.