BUF_OFFSET_CPU
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
(char *)(dev->mem_start + BUF_OFFSET_CPU +
(char *)(dev->mem_start + BUF_OFFSET_CPU +
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +