Intel Extensible Firmware Interface Specification page 315

Intel extensible firmware interface specification
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Description
This function gets the current interrupt and recycled transmit buffer status from the network
interface. The interrupt status is returned as a bit mask in InterruptStatus. If
is NULL, the interrupt status will not be read. If
InterruptStatus
recycled transmit buffer address will be retrieved. If a recycled transmit buffer address is returned
in TxBuf, then the buffer has been successfully transmitted, and the status for that buffer is
cleared. If the status of the network interface is successfully collected,
returned. If the driver has not been initialized,
Status Codes Returned
EFI_SUCCESS
EFI_NOT_STARTED
EFI_INVALID_PARAMETER
EFI_DEVICE_ERROR
EFI_UNSUPPORTED
Version 1.02
EFI_DEVICE_ERROR
The status of the network interface was retrieved.
The network interface has not been started.
One or more of the parameters has an unsupported value.
The command could not be sent to the network interface.
This function is not supported by the network interface.
12/12/00
SIMPLE_NETWORK Protocol
is not NULL, a
TxBuf
will be
EFI_SUCCESS
will be returned.
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