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Individual register files, like the ones for scalar integer, floating point, or condition code registers, are now declared as vectors of their actual type. Accessing them is simple, since the register you want can be accessed simply by indexing into the vector. Unfortunately, that means the code that sets up that storage has to know what that underlying type is, and that means knowing (and hard coding) information about the ISA being built. Instead, this change makes the SimpleThread and O3 PhysRegFile classes store registers as vectors of bytes, and offsets into those vectors using computed offsets. Because the elements of the register files are forced to be offset by powers of 2, computing the offsets can be done with a shift rather than a multiplication. The accessors which actually pull values in and out of these vectors are still specific to each register type and need to know what the underlying type is, but this change pulls that one level out of the CPUs towards their peripheral APIs. Later changes will factor these uses out as well. Change-Id: I5e19d359a0e83e5827ae263d369999f90c7aa63d Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49105 Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@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.