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The Request::NO_ACCESS flag instructs the cpu model to not issue the request to the memory port. While Atomic and Timing CPU models properly implement it [1], [2], * MinorCPU is not looking at the flag * O3CPU is looking at the flag only in case of a nested transaction start/commit This patch is extending NO_ACCESS support to all memory instructions. This is achieved by using the localAccess callback in the Request object. Handling of nested hardware transactions in the O3 LSQUnit is moved within the local accessor callback [1]: https://github.com/gem5/gem5/blob/v21.1.0.2/\ src/cpu/simple/timing.cc#L318 [2]: https://github.com/gem5/gem5/blob/v21.1.0.2/\ src/cpu/simple/atomic.cc#L396 Change-Id: Ifd5b388c53ead4fe358aa35d2197c12f1c5bb4f2 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56591 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: ZHENGRONG WANG <seanyukigeek@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: 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, 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.