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676ae57827
1. Eliminate state NP in L0 and L1 Caches: The two states 'NP' and 'I' both mean that the cache block is not present in the cache. 'I' also means that the cache entry has been allocated. This causes problems when we do not correctly initialize the cache entry when it is re-used. Hence, this patch eliminates the state NP altogether. Everytime a new block comes into the cache, a cache entry is allocated. Everytime a block leaves, the corresponding entry is deallocated. 2. Separate transient state for instruction fetches: purely for accouting purposes. 3. Drop state IS_I in L1 Cache and the message type STALE_DATA: when invalidation is received for a block in IS, the block used to be moved to IS_I. This meant that the data that would arrive in future would be used but not stored since the controller lost the permissions after gaining them. This state is being dropped and now invalidation messages would not processed till the data has arrived. This also means that STALE_DATA type is not longer required. |
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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.