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   Notification call back function for WaitForPacket event.
  13
  14   @param  Event       EFI Event.
  15   @param  SnpPtr      Pointer to SNP_DRIVER structure.
  16
  17 **/
  18 VOID
  19 EFIAPI
  20 SnpWaitForPacketNotify (
  21   EFI_EVENT  Event,
  22   VOID       *SnpPtr
  23   )
  24 {
  25   PXE_DB_GET_STATUS  PxeDbGetStatus;
  26
  27   //
  28   // Do nothing if either parameter is a NULL pointer.
  29   //
  30   if ((Event == NULL) || (SnpPtr == NULL)) {
  31     return;
  32   }
  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   //
  48   // Fill in CDB for UNDI GetStatus().
  49   //
  50   ((SNP_DRIVER *)SnpPtr)->Cdb.OpCode    = PXE_OPCODE_GET_STATUS;
  51   ((SNP_DRIVER *)SnpPtr)->Cdb.OpFlags   = 0;
  52   ((SNP_DRIVER *)SnpPtr)->Cdb.CPBsize   = PXE_CPBSIZE_NOT_USED;
  53   ((SNP_DRIVER *)SnpPtr)->Cdb.CPBaddr   = PXE_CPBADDR_NOT_USED;
  54   ((SNP_DRIVER *)SnpPtr)->Cdb.DBsize    = (UINT16)(sizeof (UINT32) * 2);
  55   ((SNP_DRIVER *)SnpPtr)->Cdb.DBaddr    = (UINT64)(UINTN)(((SNP_DRIVER *)SnpPtr)->Db);
  56   ((SNP_DRIVER *)SnpPtr)->Cdb.StatCode  = PXE_STATCODE_INITIALIZE;
  57   ((SNP_DRIVER *)SnpPtr)->Cdb.StatFlags = PXE_STATFLAGS_INITIALIZE;
  58   ((SNP_DRIVER *)SnpPtr)->Cdb.IFnum     = ((SNP_DRIVER *)SnpPtr)->IfNum;
  59   ((SNP_DRIVER *)SnpPtr)->Cdb.Control   = PXE_CONTROL_LAST_CDB_IN_LIST;
  60
  61   //
  62   // Clear contents of DB buffer.
  63   //
  64   ZeroMem (((SNP_DRIVER *)SnpPtr)->Db, sizeof (UINT32) * 2);
  65
  66   //
  67   // Issue UNDI command and check result.
  68   //
  69   (*((SNP_DRIVER *)SnpPtr)->IssueUndi32Command)((UINT64)(UINTN)&((SNP_DRIVER *)SnpPtr)->Cdb);
  70
  71   if (((SNP_DRIVER *)SnpPtr)->Cdb.StatCode != EFI_SUCCESS) {
  72     return;
  73   }
  74
  75   //
  76   // We might have a packet.  Check the receive length and signal
  77   // the event if the length is not zero.
  78   //
  79   CopyMem (
  80     &PxeDbGetStatus,
  81     ((SNP_DRIVER *)SnpPtr)->Db,
  82     sizeof (UINT32) * 2
  83     );
  84
  85   if (PxeDbGetStatus.RxFrameLen != 0) {
  86     gBS->SignalEvent (Event);
  87   }
  88 }