1. A method for invalidating entries within a translation control entry (TCE) cache within a host bridge, wherein said host bridge is coupled between a plurality of processors and a plurality of adaptors, said method comprising: detecting a modification to a TCE in a TCE table; in response to a detection of a modified TCE in said TCE table, sending a memory mapped input/output (MMIO) Store to a TCE invalidate register to specify an address of said modified TCE; utilizing data within said TCE invalidate register to generate a command for invalidating an entry in said TCE cache containing an unmodified copy of said modified TCE in said TCE table; and invalidating said entry in said TCE cache.