Specifies the 64-bit address of the watchpoint in shared system
 	space (S0, S1, S2, shared page tables, global page tables, and the
 	PFN database).  Specify the input address in hexadecimal radix.  The
 	address may be proceeded by the letter 'G'.  This will have the
 	effect of adding to the input address the value  'FFFFFFFF80000000'.
 	This can be used as a short hand to specify an S0/S1 system address.
 	The address may be proceeded by the letter 'I'.   This will have the
 	effect of adding leading 'F's to the input address.   It can be used
 	as a short hand for specifying an S2 address.