In reply to Prashant Soni:
If you have more than 1 register sub-blocks in your RAL you can get these subblocks by executing 'get_blocks'.
The definition is:
virtual function void get_blocks (ref uvm_reg_block blks[$], input uvm_hier_e hier = UVM_HIER)
and you have to execute this on your register map.
Afterwards you can extract all registers belonging to the corresponding register block by executing 'get_registers'.