__snb_pcode_rw
err = __snb_pcode_rw(uncore, mbox, val, val1, 500, 20, true);
err = __snb_pcode_rw(uncore, mbox, &val, NULL, 250, timeout_ms, false);
*status = __snb_pcode_rw(uncore, mbox, &request, NULL, 500, 0, true);