MC5_MEM_MASK
high_mem_base = (priv->adec[ADEC2 + offset] & MC5_MEM_MASK) * MC5_HIMEM_BASE;
high_mem_offset = priv->adec[ADEC3 + offset] & MC5_MEM_MASK;
low_mem_offset = priv->adec[ADEC1 + offset] & MC5_MEM_MASK;