MdeModulePkg/Universal/Network/SnpDxe/WaitForPacket.c

   1 /** @file
   2 Copyright (c) 2004, Intel Corporation
   3 All rights reserved. This program and the accompanying materials
   4 are licensed and made available under the terms and conditions of the BSD License
   5 which accompanies this distribution.  The full text of the license may be found at
   6 http://opensource.org/licenses/bsd-license.php
   7
   8 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10
  11 Module name:
  12   WaitForPacket.c
  13
  14 Abstract:
  15   Event handler to check for available packet.
  16
  17
  18 **/
  19
  20 #include "Snp.h"
  21
  22
  23 /**
  24
  25
  26
  27 **/
  28 VOID
  29 EFIAPI
  30 SnpWaitForPacketNotify (
  31   EFI_EVENT Event,
  32   VOID      *SnpPtr
  33   )
  34 {
  35   PXE_DB_GET_STATUS PxeDbGetStatus;
  36
  37   //
  38   // Do nothing if either parameter is a NULL pointer.
  39   //
  40   if (Event == NULL || SnpPtr == NULL) {
  41     return ;
  42   }
  43   //
  44   // Do nothing if the SNP interface is not initialized.
  45   //
  46   switch (((SNP_DRIVER *) SnpPtr)->mode.State) {
  47   case EfiSimpleNetworkInitialized:
  48     break;
  49
  50   case EfiSimpleNetworkStopped:
  51   case EfiSimpleNetworkStarted:
  52   default:
  53     return ;
  54   }
  55   //
  56   // Fill in CDB for UNDI GetStatus().
  57   //
  58   ((SNP_DRIVER *) SnpPtr)->cdb.OpCode     = PXE_OPCODE_GET_STATUS;
  59   ((SNP_DRIVER *) SnpPtr)->cdb.OpFlags    = 0;
  60   ((SNP_DRIVER *) SnpPtr)->cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
  61   ((SNP_DRIVER *) SnpPtr)->cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;
  62   ((SNP_DRIVER *) SnpPtr)->cdb.DBsize     = sizeof (UINT32) * 2;
  63   ((SNP_DRIVER *) SnpPtr)->cdb.DBaddr     = (UINT64)(UINTN) (((SNP_DRIVER *) SnpPtr)->db);
  64   ((SNP_DRIVER *) SnpPtr)->cdb.StatCode   = PXE_STATCODE_INITIALIZE;
  65   ((SNP_DRIVER *) SnpPtr)->cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
  66   ((SNP_DRIVER *) SnpPtr)->cdb.IFnum      = ((SNP_DRIVER *) SnpPtr)->if_num;
  67   ((SNP_DRIVER *) SnpPtr)->cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;
  68
  69   //
  70   // Clear contents of DB buffer.
  71   //
  72   ZeroMem (((SNP_DRIVER *) SnpPtr)->db, sizeof (UINT32) * 2);
  73
  74   //
  75   // Issue UNDI command and check result.
  76   //
  77   (*((SNP_DRIVER *) SnpPtr)->issue_undi32_command) ((UINT64)(UINTN) &((SNP_DRIVER *) SnpPtr)->cdb);
  78
  79   if (((SNP_DRIVER *) SnpPtr)->cdb.StatCode != EFI_SUCCESS) {
  80     return ;
  81   }
  82   //
  83   // We might have a packet.  Check the receive length and signal
  84   // the event if the length is not zero.
  85   //
  86   CopyMem (
  87     &PxeDbGetStatus,
  88     ((SNP_DRIVER *) SnpPtr)->db,
  89     sizeof (UINT32) * 2
  90     );
  91
  92   if (PxeDbGetStatus.RxFrameLen != 0) {
  93     gBS->SignalEvent (Event);
  94   }
  95 }
  96
  97 /* eof - WaitForPacket.c */