ETR_SG_PAGE_SIZE
(ETR_SG_PAGE_SIZE * (sgtidx + 1));
paddr = data_daddrs[dpidx] + spidx * ETR_SG_PAGE_SIZE;
paddr = data_daddrs[dpidx] + spidx * ETR_SG_PAGE_SIZE;
#define ETR_SG_PAGES_PER_SYSPAGE (PAGE_SIZE / ETR_SG_PAGE_SIZE)
#define ETR_SG_PTRS_PER_PAGE (ETR_SG_PAGE_SIZE / sizeof(sgte_t))