AHCI_PRDT_NUMBER
AHCI_PRDT_NUMBER, /* dma_attr_sgllen */
int ahci_dma_prdt_number = AHCI_PRDT_NUMBER;
(ahci_dma_prdt_number - AHCI_PRDT_NUMBER) *
if (ahci_dma_prdt_number != AHCI_PRDT_NUMBER)
ahci_prdt_item_t ahcict_prdt[AHCI_PRDT_NUMBER];