How Can I set up DMA operation with my own PC software application?

I am correct that DMA operates on the End Point memory mapped to BAR[0], or is the memory involved in DMA located elsewhere?

Also, for individual DWORD read/writes to RC_SLAVE memory, must I set USE_RC_DIRECT_MEM to 1?

altpcierd_rc_slave.vhd:

USE_EP_MWR := 0;-- Allow EP to issue MemWr to RC on command

USE_RC_MWR_MRD := 1; -- Allow RC access to EP MEM thru opcode regs

USE_INIT_MEM: INTEGER := 0;

USE_RC_DIRECT_MEM: INTEGER := 0;-- Allow RC direct access to EP MEM

USE_EP_IO_RDWR:= 0; -- Allow EP to issue IO Rd/Wr to RC on command

Thanks for any insights.