- Provides services that allow ATA commands to be sent to ATA Devices attached to an ATA controller.
- Packet-based commands would be sent to ATAPI devices only through
Extended SCSI Pass Thru Protocol.
- While the ATA_PASS_THRU interface would expose an interface to the underlying ATA devices on
an ATA controller, EXT_SCSI_PASS_THRU is resopnsible for exposing a packet-based
command interface for the ATAPI devices on the same ATA controller.
在 UEFI 规范中 Pass Thru Protocol 有三种
> EFI_ATA_PASS_THRU_PROTOCOL
Provides information about an ATA controller and the ability to send
ATA Command Blocks to any ATA device attached to that ATA Controller.
> EFI_SCSI_PASS_THRU_PROTOCOL
Provides information about a SCSI channel and the ability to send SCSI
Request Packets to any SCSI device attached to that SCSI channel.
> EFI_EXT_SCSI_PASS_THRU_PROTOCOL
Provides information about a SCSI channel and the ability to send SCSI
Request Packets to any SCSI device attached to that SCSI channel.
> gEfiAtaPassThruProtocolGuid =
{ 0x1d3de7f0, 0x807, 0x424f, {0xaa, 0x69, 0x11, 0xa5, 0x4e, 0x19, 0xa4, 0x6f }}
> gEfiScsiPassThruProtocolGuid =
{ 0xA59E8FCF, 0xBDA0, 0x43BB, { 0x90, 0xB1, 0xD3, 0x73, 0x2E, 0xCA, 0xA8, 0x77 }}
> gEfiExtScsiPassThruProtocolGuid =
{ 0x143b7632, 0xb81b, 0x4cb7, {0xab, 0xd3, 0xb6, 0x25, 0xa5, 0xb9, 0xbf, 0xfe }}