AHCI_CMD_STATUS_CCS
current_slot = (port_cmd_status & AHCI_CMD_STATUS_CCS) >>
failed_slot = (port_cmd_status & AHCI_CMD_STATUS_CCS) >>
failed_slot = (port_cmd_status & AHCI_CMD_STATUS_CCS) >>
(port_cmd_status & AHCI_CMD_STATUS_CCS) >>