changesets:10879:c994264eb814

config: pd-gem5 extention, parallel/distirbuted simulation of a cluster
pd-gem5 extention enables accurate/deterministic simulation of a

parallel/distributed system using multiple simulation hosts.
We employ fixed quantum barrier syncrhronization method to synchronize gem5

processes; quantum size is a simulation parameter.
Although it is possible to simulate the switch box alongside one of the gem5 

processes, we dedicate one gem5 process for simulating switch box in order to 

prevent any of gem5 processes to be the simulation bottleneck.
The current patch is for ARM ISA. We have tested it for x86 and will

submit a follow up patch for it.
Please apply dependent patches first.