EdkModulePkg/Universal/Network/Snp32_64/Dxe/WaitForPacket.c

   1 /*++
   2 Copyright (c) 2006, 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 VOID
  23 EFIAPI
  24 SnpWaitForPacketNotify (
  25   EFI_EVENT Event,
  26   VOID      *SnpPtr
  27   )
  28 /*++
  29
  30 Routine Description:
  31
  32 Arguments:
  33
  34 Returns:
  35
  36 --*/
  37 {
  38   PXE_DB_GET_STATUS PxeDbGetStatus;
  39
  40   //
  41   // Do nothing if either parameter is a NULL pointer.
  42   //
  43   if (Event == NULL || SnpPtr == NULL) {
  44     return ;
  45   }
  46   //
  47   // Do nothing if the SNP interface is not initialized.
  48   //
  49   switch (((SNP_DRIVER *) SnpPtr)->mode.State) {
  50   case EfiSimpleNetworkInitialized:
  51     break;
  52
  53   case EfiSimpleNetworkStopped:
  54   case EfiSimpleNetworkStarted:
  55   default:
  56     return ;
  57   }
  58   //
  59   // Fill in CDB for UNDI GetStatus().
  60   //
  61   ((SNP_DRIVER *) SnpPtr)->cdb.OpCode     = PXE_OPCODE_GET_STATUS;
  62   ((SNP_DRIVER *) SnpPtr)->cdb.OpFlags    = 0;
  63   ((SNP_DRIVER *) SnpPtr)->cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
  64   ((SNP_DRIVER *) SnpPtr)->cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;
  65   ((SNP_DRIVER *) SnpPtr)->cdb.DBsize     = sizeof (UINT32) * 2;
  66   ((SNP_DRIVER *) SnpPtr)->cdb.DBaddr     = (UINT64) (UINTN) (((SNP_DRIVER *) SnpPtr)->db);
  67   ((SNP_DRIVER *) SnpPtr)->cdb.StatCode   = PXE_STATCODE_INITIALIZE;
  68   ((SNP_DRIVER *) SnpPtr)->cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
  69   ((SNP_DRIVER *) SnpPtr)->cdb.IFnum      = ((SNP_DRIVER *) SnpPtr)->if_num;
  70   ((SNP_DRIVER *) SnpPtr)->cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;
  71
  72   //
  73   // Clear contents of DB buffer.
  74   //
  75   ZeroMem (((SNP_DRIVER *) SnpPtr)->db, sizeof (UINT32) * 2);
  76
  77   //
  78   // Issue UNDI command and check result.
  79   //
  80   (*((SNP_DRIVER *) SnpPtr)->issue_undi32_command) ((UINT64) (UINTN) &((SNP_DRIVER *) SnpPtr)->cdb);
  81
  82   if (((SNP_DRIVER *) SnpPtr)->cdb.StatCode != EFI_SUCCESS) {
  83     return ;
  84   }
  85   //
  86   // We might have a packet.  Check the receive length and signal
  87   // the event if the length is not zero.
  88   //
  89   CopyMem (
  90     &PxeDbGetStatus,
  91     ((SNP_DRIVER *) SnpPtr)->db,
  92     sizeof (UINT32) * 2
  93     );
  94
  95   if (PxeDbGetStatus.RxFrameLen != 0) {
  96     gBS->SignalEvent (Event);
  97   }
  98 }
  99
 100 /* eof - WaitForPacket.c */