text: /** @file
      Implementation of resetting a network adapter.
  
  Copyright (c) 2004 - 2007, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials are licensed and made available under the
  terms and conditions of the BSD License which accompanies this distribution. The
  full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php
  
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  
  **/
  
  #include "Snp.h"
  
  
  /**
    Call UNDI to reset the NIC.
  
    @param  Snp                 Pointer to the snp driver structure.
  
    @return EFI_SUCCESSFUL      The NIC was reset.
    @retval EFI_DEVICE_ERROR    The NIC cannot be reset.
  
  **/
  EFI_STATUS
  PxeReset (
    SNP_DRIVER *Snp
    )
  {
    Snp->Cdb.OpCode     = PXE_OPCODE_RESET;
    Snp->Cdb.OpFlags    = PXE_OPFLAGS_NOT_USED;
    Snp->Cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
    Snp->Cdb.DBsize     = PXE_DBSIZE_NOT_USED;
    Snp->Cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;
    Snp->Cdb.DBaddr     = PXE_DBADDR_NOT_USED;
    Snp->Cdb.StatCode   = PXE_STATCODE_INITIALIZE;
    Snp->Cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
    Snp->Cdb.IFnum      = Snp->IfNum;
    Snp->Cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;
  
    //
    // Issue UNDI command and check result.
    //
    DEBUG ((EFI_D_NET, "\nsnp->undi.reset()  "));
  
    (*Snp->IssueUndi32Command) ((UINT64)(UINTN) &Snp->Cdb);
  
    if (Snp->Cdb.StatCode != PXE_STATCODE_SUCCESS) {
      DEBUG (
        (EFI_D_WARN,
        "\nsnp->undi32.reset()  %xh:%xh\n",
        Snp->Cdb.StatFlags,
        Snp->Cdb.StatCode)
        );
  
      //
      // UNDI could not be reset. Return UNDI error.
      //
      return EFI_DEVICE_ERROR;
    }
  
    return EFI_SUCCESS;
  }
  
  
  /**
    Resets a network adapter and reinitializes it with the parameters that were
    provided in the previous call to Initialize().
  
    This function resets a network adapter and reinitializes it with the parameters
    that were provided in the previous call to Initialize(). The transmit and
    receive queues are emptied and all pending interrupts are cleared.
    Receive filters, the station address, the statistics, and the multicast-IP-to-HW
    MAC addresses are not reset by this call. If the network interface was
    successfully reset, then EFI_SUCCESS will be returned. If the driver has not
    been initialized, EFI_DEVICE_ERROR will be returned.
  
    @param This                 A pointer to the EFI_SIMPLE_NETWORK_PROTOCOL instance.
    @param ExtendedVerification Indicates that the driver may perform a more
                                exhaustive verification operation of the device
                                during reset.
  
    @retval EFI_SUCCESS           The network interface was reset.
    @retval EFI_NOT_STARTED       The network interface has not been started.
    @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
    @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
    @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
  
  **/
  EFI_STATUS
  EFIAPI
  SnpUndi32Reset (
    IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
    IN BOOLEAN                     ExtendedVerification
    )
  {
    SNP_DRIVER  *Snp;
    EFI_TPL     OldTpl;
    EFI_STATUS  Status;
  
    //
    // Resolve Warning 4 unreferenced parameter problem
    //
    ExtendedVerification = 0;
    DEBUG ((EFI_D_WARN, "ExtendedVerification = %d is not implemented!\n", ExtendedVerification));
  
    if (This == NULL) {
      return EFI_INVALID_PARAMETER;
    }
  
    Snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (This);
  
    OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
  
    switch (Snp->Mode.State) {
    case EfiSimpleNetworkInitialized:
      break;
  
    case EfiSimpleNetworkStopped:
      Status = EFI_NOT_STARTED;
      goto ON_EXIT;
  
    default:
      Status = EFI_DEVICE_ERROR;
      goto ON_EXIT;
    }
  
    Status = PxeReset (Snp);
  
  ON_EXIT:
    gBS->RestoreTPL (OldTpl);
  
    return Status;
  }
  