tn40_tx_map
struct tn40_tx_map **pptr)
d->size = memsz / sizeof(struct tn40_tx_map) - 1;
struct tn40_tx_map *start; /* Points to the first element */
struct tn40_tx_map *end; /* Points just AFTER the last element */
struct tn40_tx_map *rptr; /* Points to the next element to read */
struct tn40_tx_map *wptr; /* Points to the next element to write */