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The patch is aiming to be spec compliant when it comes to setup the SMMU command queue (while CR0.CMDQEN = 0), in the following ways: * Writes to CMDQ_CONS (read index) are allowed during initialization * Writes to CMDQ_BASE (cmdq pointer) are allowed during initialization According to spec, If they happen when the command queue is in fuction (CR0.CMDQEN = 1), behaviour is constrained unpredictable, with the following options 1) The write is ignored 2) The register takes the value and it is unpredictable whether it affects the SMMU command queue internal state. In the model/patch we go for option 1. Change-Id: I1c55bc571a8b3a1c0b0a525e429ab7b1480544ff Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Michiel Van Tol <michiel.vantol@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19633 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.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/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. 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/Dependencies 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 ALPHA, 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/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. 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. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.