c9325700d0
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10877 6f19259b-4bc3-4df7-8a09-765794883524
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/** @file
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Event handler to check for available packet.
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Copyright (c) 2004 - 2008, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed
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and made available under the terms and conditions of the BSD License which
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accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "Snp.h"
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/**
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Nofication call back function for WaitForPacket event.
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@param Event EFI Event.
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@param SnpPtr Pointer to SNP_DRIVER structure.
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**/
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VOID
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EFIAPI
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SnpWaitForPacketNotify (
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EFI_EVENT Event,
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VOID *SnpPtr
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)
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{
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PXE_DB_GET_STATUS PxeDbGetStatus;
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//
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// Do nothing if either parameter is a NULL pointer.
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//
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if (Event == NULL || SnpPtr == NULL) {
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return ;
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}
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//
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// Do nothing if the SNP interface is not initialized.
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//
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switch (((SNP_DRIVER *) SnpPtr)->Mode.State) {
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case EfiSimpleNetworkInitialized:
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break;
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case EfiSimpleNetworkStopped:
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case EfiSimpleNetworkStarted:
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default:
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return ;
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}
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//
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// Fill in CDB for UNDI GetStatus().
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//
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((SNP_DRIVER *) SnpPtr)->Cdb.OpCode = PXE_OPCODE_GET_STATUS;
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((SNP_DRIVER *) SnpPtr)->Cdb.OpFlags = 0;
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((SNP_DRIVER *) SnpPtr)->Cdb.CPBsize = PXE_CPBSIZE_NOT_USED;
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((SNP_DRIVER *) SnpPtr)->Cdb.CPBaddr = PXE_CPBADDR_NOT_USED;
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((SNP_DRIVER *) SnpPtr)->Cdb.DBsize = (UINT16) (sizeof (UINT32) * 2);
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((SNP_DRIVER *) SnpPtr)->Cdb.DBaddr = (UINT64)(UINTN) (((SNP_DRIVER *) SnpPtr)->Db);
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((SNP_DRIVER *) SnpPtr)->Cdb.StatCode = PXE_STATCODE_INITIALIZE;
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((SNP_DRIVER *) SnpPtr)->Cdb.StatFlags = PXE_STATFLAGS_INITIALIZE;
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((SNP_DRIVER *) SnpPtr)->Cdb.IFnum = ((SNP_DRIVER *) SnpPtr)->IfNum;
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((SNP_DRIVER *) SnpPtr)->Cdb.Control = PXE_CONTROL_LAST_CDB_IN_LIST;
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//
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// Clear contents of DB buffer.
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//
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ZeroMem (((SNP_DRIVER *) SnpPtr)->Db, sizeof (UINT32) * 2);
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//
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// Issue UNDI command and check result.
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//
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(*((SNP_DRIVER *) SnpPtr)->IssueUndi32Command) ((UINT64)(UINTN) &((SNP_DRIVER *) SnpPtr)->Cdb);
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if (((SNP_DRIVER *) SnpPtr)->Cdb.StatCode != EFI_SUCCESS) {
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return ;
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}
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//
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// We might have a packet. Check the receive length and signal
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// the event if the length is not zero.
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//
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CopyMem (
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&PxeDbGetStatus,
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((SNP_DRIVER *) SnpPtr)->Db,
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sizeof (UINT32) * 2
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);
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if (PxeDbGetStatus.RxFrameLen != 0) {
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gBS->SignalEvent (Event);
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}
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}
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