bwn_shm_read_4
backup = bwn_shm_read_4(mac, BWN_SHARED, 0);
if (bwn_shm_read_4(mac, BWN_SHARED, 0) != TESTVAL0)
if (bwn_shm_read_4(mac, BWN_SHARED, 0) != TESTVAL1)
extern uint32_t bwn_shm_read_4(struct bwn_mac *, uint16_t, uint16_t);
tmp = bwn_shm_read_4(mac, BWN_SHARED, shm_offset);