Imbedded Device Driver Helpers

The following helper functions are available to the mini-FSD and may be 
called during stage 1, 2, or 3. These helpers are counterparts for some of 
the device help functions and are intended for use by a device driver 
imbedded within the mini-FSD. 

oMFSH_CALLRM 
oMFSH_LOCK 
oMFSH_PHYSTOVIRT 
oMFSH_UNLOCK 
oMFSH_UNPHYSTOVIRT 
oMFSH_VIRTTOPHYS