Intel Extensible Firmware Interface - Manual (Page 525)

Protocols — SCSI Bus Support
Version 1.10 12/01/02 13-5
EFI_SCSI_PASS_THRU_PROTOCOL.PassThru()
Summary
Sends a SCSI Request Packet to a SCSI device that is attached to the SCSI channel. This function
supports both blocking I/O and nonblocking I/O. The blocking I/O functionality is required, and
the nonblocking I/O functionality is optional.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_SCSI_PASS_THRU_PASSTHRU) (
IN EFI_SCSI_PASS_THRU_PROTOCOL
*This,
IN UINT32 Target,
IN UINT64 Lun,
IN OUT EFI_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet,
IN EFI_EVENT Event OPTIONAL
);
Parameters
This A pointer to the EFI_SCSI_PASS_THRU_PROTOCOL
instance. Type EFI_SCSI_PASS_THRU_PROTOCOL is
defined in Section 13.1.
Target The Target ID of the SCSI device to send the SCSI Request
Packet.
Lun The LUN of the SCSI device to send the SCSI Request Packet.
Packet A pointer to the SCSI Request Packet to send to the SCSI device
specified by
Target and Lun . See “Related Definitions”
below for a description of
EFI_SCSI_PASS_THRU_SCSI_REQUEST_
PACKET .
Event If nonblocking I/O is not supported then Event is ignored, and
blocking I/O is performed. If Event is NULL , then blocking
I/O is performed. If Event is not NULL and non blocking I/O is
supported, then nonblocking I/O is performed, and Event will
be signaled when the SCSI Request Packet completes.