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NMI is platform dependent according to riscv spec, so we intentionally propose a very minimal design that doesn't give user any new accessible register to interact with the NMI mechanism. In current design, the NMI reset vector is fixed to 0x0 and always set mcause to zero. mret from NMI handler is still possible, but it's up to the user to detect whether a M-mode trap handler is interrupted and to recover from it (if at all possible). 1. Add new fault type to represent NMI fault 2. Add non-standard registers to save the status of NMI a. nmivec[63:2] = NMI reset vector address b. nmie[0:0] = is NMI enabled = not in NMI handler c. nmip[0:0] = is NMI pending 3. Add new function in RiscvInterrupts to raise/clear NMI Bug: 200169094 Test: None Change-Id: Ia81e1c9589bc02f0690d094fff5f13412846acbe Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52363 Reviewed-by: Yu-hsin Wang <yuhsingw@google.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@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.