Intel Extensible Firmware Interface, Specification

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Extensible Firmware Interface Specification
274 12/12/00 Version 1.02
14.2.1 EFI_PXE_BASE_CODE_CALLBACK.Callback()
Summary
Callback function that is invoked when the PXE Base Code Protocol is about to transmit, has
received, or is waiting to receive a packet.
Prototype
EFI_PXE_BASE_CODE_CALLBACK_STATUS
(*EFI_PXE_CALLBACK) (
IN EFI_PXE_BASE_CODE_CALLBACK *This,
IN EFI_PXE_BASE_CODE_FUNCTION Function,
IN BOOLEAN Received,
IN UINT32 PacketLen,
IN EFI_PXE_BASE_CODE_PACKET *Packet OPTIONAL
);
Parameters
This
Pointer to the
EFI_PXE_BASE_CODE
instance.
Function
The PXE Base Code Protocol function that is waiting for an event.
Received TRUE
if the callback is being invoked due to a receive event.
FALSE
if
the callback is being invoked due to a transmit event.
PacketLen
The length, in bytes, of
Packet
. This field will have a value of zero if
this is a wait for receive event.
Packet
If
Received
is
TRUE
, a pointer to the packet that was just received;
otherwise a pointer to the packet that is about to be transmitted. This
field will be
NULL
if this is not a packet event.