MU_XFER_IN
if (mu->mu_datasize > 0 && (mu->mu_bufdir & MU_XFER_IN) != 0) {
#define MC_XFER_IN MU_XFER_IN /* Map describes inbound xfer */
mu.mu_bufdir = MU_XFER_IN;
mu.mu_bufdir = MU_XFER_IN;
mu.mu_bufdir = (wr ? MU_XFER_OUT : MU_XFER_IN);
mu.mu_bufdir = MU_XFER_IN;
mu.mu_bufdir = MU_XFER_IN | MU_XFER_OUT;