Intel Extensible Firmware Interface - Manual (Page 526)

Extensible Firmware Interface Specification
13-6 12/01/02 Version 1.10
Related Definitions
typedef struct {
UINT64
Timeout;
VOID *DataBuffer;
VOID *SenseData;
VOID *Cdb;
UINT32 TransferLength;
UINT8 CdbLength;
UINT8 DataDirection;
UINT8 HostAdapterStatus;
UINT8 TargetStatus;
UINT8 SenseDataLength;
} EFI_SCSI_PASS_THRU_SCSI_REQUEST_PACKET;
Timeout The timeout, in 100 ns units, to use for the execution of this
SCSI Request Packet. A
Timeout value of 0 means that this
function will wait indefinitely for the SCSI Request Packet to
execute. If
Timeout is greater than zero, then this function will
return EFI_TIMEOUT if the time required to execute the SCSI
Request Packet is greater than Timeout .
DataBuffer A pointer to the data buffer to transfer between the SCSI
controller and the SCSI device. Must be aligned to the boundary
specified in the
IoAlign field of the
EFI_SCSI_PASS_THRU_MODE structure.
SenseData A pointer to the sense data that was generated by the execution
of the SCSI Request Packet. Must be aligned to the boundary
specified in the
IoAlign field of the
EFI_SCSI_PASS_THRU_MODE structure.
Cdb A pointer to buffer that contains the Command Data Block to
send to the SCSI device specified by
Target and Lun .
TransferLength On input, the size, in bytes, of DataBuffer . On output, the
number of bytes transferred between the SCSI controller and the
SCSI device. If
TransferLength is larger than the SCSI
controller can handle, no data will be transferred,
TransferLength will be updated to contain the number of
bytes that the SCSI controller is able to transfer, and
EFI_BAD_BUFFER_SIZE will be returned.
CdbLength The length, in bytes, of the buffer Cdb . The standard values are
6, 10, 12, and 16, but other values are possible if a variable
length CDB is used.
DataDirection The direction of the data transfer. 0 for reads, 1 for writes. All
other values are reserved, and must not be used.