rootnex_pgmap_t
sizeof (rootnex_pgmap_t);
dma->dp_pgmap = (rootnex_pgmap_t *)(((uintptr_t)
rootnex_pgmap_t *cbpage;
(rootnex_prealloc_copybuf * sizeof (rootnex_pgmap_t));
rootnex_pgmap_t *dp_pgmap;