Adding src and ssd dirs with pertinent disksim code. After applying the 64bit patches, overwrite with these files. In this upload are two fixes. 1)fix to message passing in physim_driver.h, disksim component was failing because blocklength was not being communicated. Size of data transmission increased to 32 from 24. 2) commenting out failing assert statement in ssd.c, the simulated component will not perform optimally but it will run. Essentially, the module was programmed so that if a workload was not block aligned it should fail, some PFSsim workloads are not block aligned