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The flow for Full System amdgpu is the use KVM to boot linux and begin loading the driver module. However, the amdgpu module requires reading the VGA ROM located at 0xc0000 in X86. KVM does not support having a small 128KiB hole at this location, therefore we take a checkpoint and switch to a timing CPU to continue loading the drivers before the VGA ROM is read. This creates a checkpoint just before the first MMIOs. This is indicated by three interrupts being sent to the PCI device. After three interrupts in a row are counted a checkpoint exit event occurs. The interrupt counter is reset if a non-interrupt PCI read is seen. Change-Id: I23b320abe81ff6e766cb3f604eca2979339938e5 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46161 Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Matt Sinclair <mattdsinclair@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.