MdeModulePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdeModulePkg / Universal / Network / SnpDxe / WaitForPacket.c

/** @file\r
    Event handler to check for available packet.\r
\r
Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "Snp.h"\r
\r
\r
/**\r
  Nofication call back function for WaitForPacket event.\r
\r
  @param  Event       EFI Event.\r
  @param  SnpPtr      Pointer to SNP_DRIVER structure.\r
\r
**/\r
VOID\r
EFIAPI\r
SnpWaitForPacketNotify (\r
  EFI_EVENT     Event,\r
  VOID          *SnpPtr\r
  )\r
{\r
  PXE_DB_GET_STATUS PxeDbGetStatus;\r
\r
  //\r
  // Do nothing if either parameter is a NULL pointer.\r
  //\r
  if (Event == NULL || SnpPtr == NULL) {\r
    return ;\r
  }\r
  //\r
  // Do nothing if the SNP interface is not initialized.\r
  //\r
  switch (((SNP_DRIVER *) SnpPtr)->Mode.State) {\r
  case EfiSimpleNetworkInitialized:\r
    break;\r
\r
  case EfiSimpleNetworkStopped:\r
  case EfiSimpleNetworkStarted:\r
  default:\r
    return ;\r
  }\r
  //\r
  // Fill in CDB for UNDI GetStatus().\r
  //\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.OpCode     = PXE_OPCODE_GET_STATUS;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.OpFlags    = 0;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.DBsize     = (UINT16) (sizeof (UINT32) * 2);\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.DBaddr     = (UINT64)(UINTN) (((SNP_DRIVER *) SnpPtr)->Db);\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.StatCode   = PXE_STATCODE_INITIALIZE;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.IFnum      = ((SNP_DRIVER *) SnpPtr)->IfNum;\r
  ((SNP_DRIVER *) SnpPtr)->Cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;\r
\r
  //\r
  // Clear contents of DB buffer.\r
  //\r
  ZeroMem (((SNP_DRIVER *) SnpPtr)->Db, sizeof (UINT32) * 2);\r
\r
  //\r
  // Issue UNDI command and check result.\r
  //\r
  (*((SNP_DRIVER *) SnpPtr)->IssueUndi32Command) ((UINT64)(UINTN) &((SNP_DRIVER *) SnpPtr)->Cdb);\r
\r
  if (((SNP_DRIVER *) SnpPtr)->Cdb.StatCode != EFI_SUCCESS) {\r
    return ;\r
  }\r
  //\r
  // We might have a packet.  Check the receive length and signal\r
  // the event if the length is not zero.\r
  //\r
  CopyMem (\r
    &PxeDbGetStatus,\r
    ((SNP_DRIVER *) SnpPtr)->Db,\r
    sizeof (UINT32) * 2\r
    );\r
\r
  if (PxeDbGetStatus.RxFrameLen != 0) {\r
    gBS->SignalEvent (Event);\r
  }\r
}\r