prd_entry
prd_entry *prdt;
#define ATA_ADAPTER_MAX_SG_COUNT (B_PAGE_SIZE / sizeof( prd_entry ))
prdtSize = (ATA_ADAPTER_MAX_SG_COUNT * sizeof(prd_entry) + (B_PAGE_SIZE - 1)) & ~(B_PAGE_SIZE - 1);
prd_entry *prd = channel->prdt;
prd_entry * prdt;
prd_entry *prd = channel->prdt;
prdt_size = (ATA_ADAPTER_MAX_SG_COUNT * sizeof( prd_entry ) + (B_PAGE_SIZE - 1)) & ~(B_PAGE_SIZE - 1);