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Some platforms are not GICv4 compatible, therefore we need to make sure the stride between redistributors is configurable: 2 frames of 64KiB for GICv3 => a stride of 128KiB 4 frames of 64KiB for GICv4 => a stride of 256KiB We detect this at runtime by reading the GICD_PIDR2.ArchRev bitfield This is 3 for GICv3 and 4 for GICv4. Note: other software projects [1] rely on a different check, mainly reading the GICR_TYPER.VLPIS bit We diverge from this behaviour as VLPIS are not implemented and we do not want to incorrectly report this to the probing software. We should move to VLPIS once they get implemented [1]: https://github.com/torvalds/linux/blob/\ 107c948d1d3e61d10aee9d0f7c3d81bbee9842af/\ drivers/irqchip/irq-gic-v3.c#L864 Change-Id: I7cc554f48cc6a347c03ed80cf2ea320f618a59c2 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59394 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.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.