dd77848e2c
Prior to this patch table walks were always cacheable unless
cacheability was globally disabled by SCTLR.C being 0. Arm allows to
select the memory attributes of table walks via the TCR registers.
For example the TCR.IRGN0 bits:
Inner cacheability attribute for memory associated with translation
table walks using TTBR0_EL1.
IRGN0 Meaning
0b00 Normal memory, Inner Non-cacheable.
0b01 Normal memory, Inner Write-Back Read-Allocate Write-Allocate
Cacheable.
0b10 Normal memory, Inner Write-Through Read-Allocate No
Write-Allocate Cacheable.
0b11 Normal memory, Inner Write-Back Read-Allocate No Write-Allocate
Cacheable.
Note: we check IRGNx bits (Inner Shareable domain) instead of ORGNx
(Outer Shareable domain) since in gem5 we consider everything as
Inner Shareable.
Change-Id: If472c218040029c9d165b056a052f522d48d4a82
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22723
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.