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This patch hosts gem5 onto SystemC scheduler. There's already an upstream
review board patch that does something similar but this patch ...:
1) is less obtrusive to the existing gem5 code organisation. It's divided
into the 'generic' preparatory patches (already submitted) and this patch
which affects no existing files
2) does not try to exactly track the gem5 event queue with notifys into
SystemC and so doesn't requive the event queue to be modified for
anything other than 'out of event queue' scheduling events
3) supports debug logging with SC_REPORT
The patch consists of the files:
util/systemc/
sc_gem5_control.{cc,hh} -- top level objects to use to
instantiate gem5 Systems within
larger SystemC test harnesses as
sc_module objects
sc_logger.{cc,hh} -- logging support
sc_module.{cc,hh} -- a separated event loop specific to
SystemC
stats.{cc,hh} -- example Stats handling for the sample
top level
main.{cc,hh} -- a sample top level
On the downside this patch is only currently functional with C++
configuration at the top level.
The above sc_... files are indended to be compiled alongside gem5 (as a
library, see main.cc for a command line and util/systemc/README for
more details.)
The top-level system instantiation in sc_gem5_control.{cc,hh} provides
two classes: Gem5Control and Gem5System
Gem5Control is a simulation control class (from which a singleton
object should be created) derived from Gem5SystemC::Module which
carries the top level simulation control interface for gem5. This
includes hosting a system-building configuration file and
instantiating the Root object from that file.
Gem5System is a base class for instantiating renamed gem5 Systems
from the config file hosted by the Gem5Control object. In use, a
SystemC module class should be made which represents the desired,
instantiable gem5 System. That class's instances should create
a Gem5System during their construction, set the parameters of that
system and then call instantiate to build that system. If this
is all carried out in the sc_core::sc_module-derived classes
constructor, the System's external ports will become children of
that module and can then be recovered by name using sc_core::
sc_find_object.
It is intended that this interface is used with dlopen. To that
end, the header file sc_gem5_control.hh includes no other header
files from gem5 (and so can be easily copied into another project).
The classes Gem5System and Gem5Control have all their member
functions declared `virtual' so that those functions can be called
through the vtable acquired by building the top level Gem5Control
using dlsym(..., "makeGem5Control") and `makeSystem' on the
Gem5Control.
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