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The lock feature will let M mode do memory permission check before R/W/X data. If the lock bit of pmpicfg set, then the pmpicfg and pmpaddri will ignore the update value later until CPU reset, and pmpaddri-1 will ignore if the TOR A field is set. The following is add in CL: 1. Add condition to run PMP check when any lock bit of pmp tables is set 2. Add PMP_LOCK bit check when try to update pmpaddr and pmpcfg 3. If there is no PMP entry matches and priviledge mode is M, no fault generated 4. If the address matches PMP entry, return no fault if priviledge mode is M and lock bit is not set For more details about PMP, please see RISC-V Spec Volumn II, Priviledge Archtecture, Ver 1.12, Section 3.7 Physical Memory Protection Change-Id: I3e7c5824d6c05f2ea928ee9ec7714f7271e4c58c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68057 Reviewed-by: Ayaz Akram <yazakram@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Yu-hsin Wang <yuhsingw@google.com> Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
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.