[Gems-users] Adding a handler in Opal for I/O instructions

[Philip Garcia <pcgarcia@xxxxxxxx>]

Hello,
I was wondering if anyone is familiar with how to add delays into  
Opals pipeline.  I am trying to add a delay so that certain I/O loads  
and stores get delayed by a set amount.  I have found the relevant  
place in load_inst_t::Execute where Opal checks if a memory operation  
is to an IO instruction, but if it is, I am unsure of how to delay  
it.  I tried adding a simple delay that doesn't set the stage to  
COMPLETE_STAGE until a static number of cycles passes, but this  
appears to cause opal to crash, as instructions in the queue end up  
having no stage associated with them.  However, when I tried adding my  
own stage into Dynamic.h which was DELAY_IO_STAGE, and setting the  
memop instructions stage to this, it doesn't appear to ever go into  
the relevant case statement I added in dynamic_inst_t::Schedule, and  
later crashes for the same reason.  I was wondering if maybe I am  
doing something wrong, or misunderstood the organization of this code.
Any help would be greatly appreciated.

thanks,
Phil