PMCS_REGSET_3
if (ddi_dev_regsize(dip, PMCS_REGSET_3, &set3size) != DDI_SUCCESS) {
"unable to get size of register set %d", PMCS_REGSET_3);
if (ddi_regs_map_setup(dip, PMCS_REGSET_3, (caddr_t *)&pwp->mpi_regs,