NetworkPkg/SnpDxe/WaitForPacket.c

   1 /** @file
   2     Event handler to check for available packet.
   3
   4 Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "Snp.h"
  10
  11
  12 /**
  13   Nofication call back function for WaitForPacket event.
  14
  15   @param  Event       EFI Event.
  16   @param  SnpPtr      Pointer to SNP_DRIVER structure.
  17
  18 **/
  19 VOID
  20 EFIAPI
  21 SnpWaitForPacketNotify (
  22   EFI_EVENT     Event,
  23   VOID          *SnpPtr
  24   )
  25 {
  26   PXE_DB_GET_STATUS PxeDbGetStatus;
  27
  28   //
  29   // Do nothing if either parameter is a NULL pointer.
  30   //
  31   if (Event == NULL || SnpPtr == NULL) {
  32     return ;
  33   }
  34   //
  35   // Do nothing if the SNP interface is not initialized.
  36   //
  37   switch (((SNP_DRIVER *) SnpPtr)->Mode.State) {
  38   case EfiSimpleNetworkInitialized:
  39     break;
  40
  41   case EfiSimpleNetworkStopped:
  42   case EfiSimpleNetworkStarted:
  43   default:
  44     return ;
  45   }
  46   //
  47   // Fill in CDB for UNDI GetStatus().
  48   //
  49   ((SNP_DRIVER *) SnpPtr)->Cdb.OpCode     = PXE_OPCODE_GET_STATUS;
  50   ((SNP_DRIVER *) SnpPtr)->Cdb.OpFlags    = 0;
  51   ((SNP_DRIVER *) SnpPtr)->Cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
  52   ((SNP_DRIVER *) SnpPtr)->Cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;
  53   ((SNP_DRIVER *) SnpPtr)->Cdb.DBsize     = (UINT16) (sizeof (UINT32) * 2);
  54   ((SNP_DRIVER *) SnpPtr)->Cdb.DBaddr     = (UINT64)(UINTN) (((SNP_DRIVER *) SnpPtr)->Db);
  55   ((SNP_DRIVER *) SnpPtr)->Cdb.StatCode   = PXE_STATCODE_INITIALIZE;
  56   ((SNP_DRIVER *) SnpPtr)->Cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
  57   ((SNP_DRIVER *) SnpPtr)->Cdb.IFnum      = ((SNP_DRIVER *) SnpPtr)->IfNum;
  58   ((SNP_DRIVER *) SnpPtr)->Cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;
  59
  60   //
  61   // Clear contents of DB buffer.
  62   //
  63   ZeroMem (((SNP_DRIVER *) SnpPtr)->Db, sizeof (UINT32) * 2);
  64
  65   //
  66   // Issue UNDI command and check result.
  67   //
  68   (*((SNP_DRIVER *) SnpPtr)->IssueUndi32Command) ((UINT64)(UINTN) &((SNP_DRIVER *) SnpPtr)->Cdb);
  69
  70   if (((SNP_DRIVER *) SnpPtr)->Cdb.StatCode != EFI_SUCCESS) {
  71     return ;
  72   }
  73   //
  74   // We might have a packet.  Check the receive length and signal
  75   // the event if the length is not zero.
  76   //
  77   CopyMem (
  78     &PxeDbGetStatus,
  79     ((SNP_DRIVER *) SnpPtr)->Db,
  80     sizeof (UINT32) * 2
  81     );
  82
  83   if (PxeDbGetStatus.RxFrameLen != 0) {
  84     gBS->SignalEvent (Event);
  85   }
  86 }