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/** @file
Event handler to check for available packet.
Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Snp.h"
/**
Notification call back function for WaitForPacket event.
@param Event EFI Event.
@param SnpPtr Pointer to SNP_DRIVER structure.
**/
VOID
EFIAPI
SnpWaitForPacketNotify (
EFI_EVENT Event,
VOID *SnpPtr
)
{
PXE_DB_GET_STATUS PxeDbGetStatus;
//
// Do nothing if either parameter is a NULL pointer.
//
if ((Event == NULL) || (SnpPtr == NULL)) {
return;
}
//
// Do nothing if the SNP interface is not initialized.
//
switch (((SNP_DRIVER *)SnpPtr)->Mode.State) {
case EfiSimpleNetworkInitialized:
break;
case EfiSimpleNetworkStopped:
case EfiSimpleNetworkStarted:
default:
return;
}
//
// Fill in CDB for UNDI GetStatus().
//
((SNP_DRIVER *)SnpPtr)->Cdb.OpCode = PXE_OPCODE_GET_STATUS;
((SNP_DRIVER *)SnpPtr)->Cdb.OpFlags = 0;
((SNP_DRIVER *)SnpPtr)->Cdb.CPBsize = PXE_CPBSIZE_NOT_USED;
((SNP_DRIVER *)SnpPtr)->Cdb.CPBaddr = PXE_CPBADDR_NOT_USED;
((SNP_DRIVER *)SnpPtr)->Cdb.DBsize = (UINT16)(sizeof (UINT32) * 2);
((SNP_DRIVER *)SnpPtr)->Cdb.DBaddr = (UINT64)(UINTN)(((SNP_DRIVER *)SnpPtr)->Db);
((SNP_DRIVER *)SnpPtr)->Cdb.StatCode = PXE_STATCODE_INITIALIZE;
((SNP_DRIVER *)SnpPtr)->Cdb.StatFlags = PXE_STATFLAGS_INITIALIZE;
((SNP_DRIVER *)SnpPtr)->Cdb.IFnum = ((SNP_DRIVER *)SnpPtr)->IfNum;
((SNP_DRIVER *)SnpPtr)->Cdb.Control = PXE_CONTROL_LAST_CDB_IN_LIST;
//
// Clear contents of DB buffer.
//
ZeroMem (((SNP_DRIVER *)SnpPtr)->Db, sizeof (UINT32) * 2);
//
// Issue UNDI command and check result.
//
(*((SNP_DRIVER *)SnpPtr)->IssueUndi32Command)((UINT64)(UINTN)&((SNP_DRIVER *)SnpPtr)->Cdb);
if (((SNP_DRIVER *)SnpPtr)->Cdb.StatCode != EFI_SUCCESS) {
return;
}
//
// We might have a packet. Check the receive length and signal
// the event if the length is not zero.
//
CopyMem (
&PxeDbGetStatus,
((SNP_DRIVER *)SnpPtr)->Db,
sizeof (UINT32) * 2
);
if (PxeDbGetStatus.RxFrameLen != 0) {
gBS->SignalEvent (Event);
}
}
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