DRAM_MSG_TYPE_OFFSET
msg_type = (response >> DRAM_MSG_TYPE_OFFSET) & DRAM_MSG_TYPE_MASK;
#define DRAM_MSG_ADDR_MASK ((1UL << DRAM_MSG_TYPE_OFFSET) - 1)
(BITS_PER_LONG - DRAM_MSG_TYPE_OFFSET)) - 1)