MR_ArPdGet
pd0 = MR_ArPdGet(arRef, arm, drv_map);
pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
pd = MR_ArPdGet(arRef, physArm, map); /* Get the Pd. */
r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
pd = MR_ArPdGet(arRef, physArm, map);
MR_ArPdGet(u_int32_t ar, u_int32_t arm,
pd = MR_ArPdGet(arRef, physArm, map);
r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
pd = MR_ArPdGet(arRef, physArm, map);