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According to privileged ISA specs, a valid 64 bit virtual address should have bit 63-39 same as bit 38 (for Sv39). Without this change, kernel page fault handler does not seem to work correctly. For example, while running a program, the kernel was segfaulting complaining that it cannot handle kernel paging request at some virtual address (which is the faulting address returned by gem5 currently, with all bits after first 39 cleared). With this change, that error goes away. Change-Id: Iae7c9d0af19e29214e14a0db08d7c0ac122122bc Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45920 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Nils Asmussen <nils.asmussen@barkhauseninstitut.org> 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, SWIG, 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 the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - 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 will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.