audk/OptionRomPkg/UndiRuntimeDxe/Init.c

/** @file
  Initialization functions for EFI UNDI32 driver.

Copyright (c) 2006 - 2013, 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 "Undi32.h"
//
// Global Variables
//

PXE_SW_UNDI             *pxe_31 = NULL;  // 3.1 entry
UNDI32_DEV              *UNDI32DeviceList[MAX_NIC_INTERFACES];
UNDI_CONFIG_TABLE       *UndiDataPointer = NULL;

//
// UNDI Class Driver Global Variables
//
EFI_DRIVER_BINDING_PROTOCOL  gUndiDriverBinding = {
  UndiDriverSupported,
  UndiDriverStart,
  UndiDriverStop,
  0xa,
  NULL,
  NULL
};


/**
  When address mapping changes to virtual this should make the appropriate
  address conversions.

  (Standard Event handler)

  @return None

**/
VOID
EFIAPI
UndiNotifyVirtual (
  EFI_EVENT Event,
  VOID      *Context
  )
{
  UINT16  Index;
  VOID    *Pxe31Pointer;

  if (pxe_31 != NULL) {
    Pxe31Pointer = (VOID *) pxe_31;

    EfiConvertPointer (
      EFI_OPTIONAL_PTR,
      (VOID **) &Pxe31Pointer
      );

    //
    // UNDI32DeviceList is an array of pointers
    //
    for (Index = 0; Index < (pxe_31->IFcnt | pxe_31->IFcntExt << 8); Index++) {
      UNDI32DeviceList[Index]->NIIProtocol_31.Id = (UINT64) (UINTN) Pxe31Pointer;
      EfiConvertPointer (
        EFI_OPTIONAL_PTR,
        (VOID **) &(UNDI32DeviceList[Index])
        );
    }

    EfiConvertPointer (
      EFI_OPTIONAL_PTR,
      (VOID **) &(pxe_31->EntryPoint)
      );
    pxe_31 = Pxe31Pointer;
  }

  for (Index = 0; Index <= PXE_OPCODE_LAST_VALID; Index++) {
    EfiConvertPointer (
      EFI_OPTIONAL_PTR,
      (VOID **) &api_table[Index].api_ptr
      );
  }
}


/**
  When EFI is shuting down the boot services, we need to install a
  configuration table for UNDI to work at runtime!

  (Standard Event handler)

  @return None

**/
VOID
EFIAPI
UndiNotifyExitBs (
  EFI_EVENT Event,
  VOID      *Context
  )
{
  InstallConfigTable ();
}


/**
  Test to see if this driver supports ControllerHandle. Any ControllerHandle
  than contains a  DevicePath, PciIo protocol, Class code of 2, Vendor ID of 0x8086,
  and DeviceId of (D100_DEVICE_ID || D102_DEVICE_ID || ICH3_DEVICE_ID_1 ||
  ICH3_DEVICE_ID_2 || ICH3_DEVICE_ID_3 || ICH3_DEVICE_ID_4 || ICH3_DEVICE_ID_5 ||
  ICH3_DEVICE_ID_6 || ICH3_DEVICE_ID_7 || ICH3_DEVICE_ID_8) can be supported.

  @param  This                 Protocol instance pointer.
  @param  Controller           Handle of device to test.
  @param  RemainingDevicePath  Not used.

  @retval EFI_SUCCESS          This driver supports this device.
  @retval other                This driver does not support this device.

**/
EFI_STATUS
EFIAPI
UndiDriverSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  )
{
  EFI_STATUS          Status;
  EFI_PCI_IO_PROTOCOL *PciIo;
  PCI_TYPE00          Pci;

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = PciIo->Pci.Read (
                        PciIo,
                        EfiPciIoWidthUint8,
                        0,
                        sizeof (PCI_CONFIG_HEADER),
                        &Pci
                        );

  if (!EFI_ERROR (Status)) {
    Status = EFI_UNSUPPORTED;

    if (Pci.Hdr.ClassCode[2] == 0x02 && Pci.Hdr.VendorId == PCI_VENDOR_ID_INTEL) {
      switch (Pci.Hdr.DeviceId) {
      case D100_DEVICE_ID:
      case D102_DEVICE_ID:
      case ICH3_DEVICE_ID_1:
      case ICH3_DEVICE_ID_2:
      case ICH3_DEVICE_ID_3:
      case ICH3_DEVICE_ID_4:
      case ICH3_DEVICE_ID_5:
      case ICH3_DEVICE_ID_6:
      case ICH3_DEVICE_ID_7:
      case ICH3_DEVICE_ID_8:
      case 0x1039:
      case 0x103A:
      case 0x103B:
      case 0x103C:
      case 0x103D:
      case 0x103E:
      case 0x1050:
      case 0x1051:
      case 0x1052:
      case 0x1053:
      case 0x1054:
      case 0x1055:
      case 0x1056:
      case 0x1057:
      case 0x1059:
      case 0x1064:
        Status = EFI_SUCCESS;
      }
    }
  }

  gBS->CloseProtocol (
        Controller,
        &gEfiPciIoProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  return Status;
}


/**
  Start this driver on Controller by opening PciIo and DevicePath protocol.
  Initialize PXE structures, create a copy of the Controller Device Path with the
  NIC's MAC address appended to it, install the NetworkInterfaceIdentifier protocol
  on the newly created Device Path.

  @param  This                 Protocol instance pointer.
  @param  Controller           Handle of device to work with.
  @param  RemainingDevicePath  Not used, always produce all possible children.

  @retval EFI_SUCCESS          This driver is added to Controller.
  @retval other                This driver does not support this device.

**/
EFI_STATUS
EFIAPI
UndiDriverStart (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  )
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *UndiDevicePath;
  PCI_CONFIG_HEADER         *CfgHdr;
  UNDI32_DEV                *UNDI32Device;
  UINT16                    NewCommand;
  UINT8                     *TmpPxePointer;
  EFI_PCI_IO_PROTOCOL       *PciIoFncs;
  UINTN                     Len;
  UINT64                    Supports;
  BOOLEAN                   PciAttributesSaved;

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIoFncs,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &UndiDevicePath,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );

  if (EFI_ERROR (Status)) {
    gBS->CloseProtocol (
          Controller,
          &gEfiPciIoProtocolGuid,
          This->DriverBindingHandle,
          Controller
          );

    return Status;
  }

  PciAttributesSaved = FALSE;

  Status = gBS->AllocatePool (
                  EfiRuntimeServicesData,
                  sizeof (UNDI32_DEV),
                  (VOID **) &UNDI32Device
                  );

  if (EFI_ERROR (Status)) {
    goto UndiError;
  }

  ZeroMem ((CHAR8 *) UNDI32Device, sizeof (UNDI32_DEV));

  //
  // Get original PCI attributes
  //
  Status = PciIoFncs->Attributes (
                    PciIoFncs,
                    EfiPciIoAttributeOperationGet,
                    0,
                    &UNDI32Device->NicInfo.OriginalPciAttributes
                    );

  if (EFI_ERROR (Status)) {
    goto UndiErrorDeleteDevice;
  }
  PciAttributesSaved = TRUE;

  //
  // allocate and initialize both (old and new) the !pxe structures here,
  // there should only be one copy of each of these structure for any number
  // of NICs this undi supports. Also, these structures need to be on a
  // paragraph boundary as per the spec. so, while allocating space for these,
  // make sure that there is space for 2 !pxe structures (old and new) and a
  // 32 bytes padding for alignment adjustment (in case)
  //
  TmpPxePointer = NULL;
  if (pxe_31 == NULL) {
    Status = gBS->AllocatePool (
                    EfiRuntimeServicesData,
                    (sizeof (PXE_SW_UNDI) + sizeof (PXE_SW_UNDI) + 32),
                    (VOID **) &TmpPxePointer
                    );

    if (EFI_ERROR (Status)) {
      goto UndiErrorDeleteDevice;
    }

    ZeroMem (
      TmpPxePointer,
      sizeof (PXE_SW_UNDI) + sizeof (PXE_SW_UNDI) + 32
      );
    //
    // check for paragraph alignment here, assuming that the pointer is
    // already 8 byte aligned.
    //
    if (((UINTN) TmpPxePointer & 0x0F) != 0) {
      pxe_31 = (PXE_SW_UNDI *) ((UINTN) (TmpPxePointer + 8));
    } else {
      pxe_31 = (PXE_SW_UNDI *) TmpPxePointer;
    }

    PxeStructInit (pxe_31);
  }

  UNDI32Device->NIIProtocol_31.Id = (UINT64) (UINTN) (pxe_31);

  Status = PciIoFncs->Attributes (
                        PciIoFncs,
                        EfiPciIoAttributeOperationSupported,
                        0,
                        &Supports
                        );
  if (!EFI_ERROR (Status)) {
    Supports &= EFI_PCI_DEVICE_ENABLE;
    Status = PciIoFncs->Attributes (
                          PciIoFncs,
                          EfiPciIoAttributeOperationEnable,
                          Supports,
                          NULL
                          );
  }
  //
  // Read all the registers from device's PCI Configuration space
  //
  Status = PciIoFncs->Pci.Read (
                            PciIoFncs,
                            EfiPciIoWidthUint32,
                            0,
                            MAX_PCI_CONFIG_LEN,
                            &UNDI32Device->NicInfo.Config
                            );

  CfgHdr = (PCI_CONFIG_HEADER *) &(UNDI32Device->NicInfo.Config[0]);

  //
  // make sure that this device is a PCI bus master
  //

  NewCommand = (UINT16) (CfgHdr->Command | PCI_COMMAND_MASTER | PCI_COMMAND_IO);
  if (CfgHdr->Command != NewCommand) {
    PciIoFncs->Pci.Write (
                    PciIoFncs,
                    EfiPciIoWidthUint16,
                    PCI_COMMAND,
                    1,
                    &NewCommand
                    );
    CfgHdr->Command = NewCommand;
  }

  //
  // make sure that the latency timer is at least 32
  //
  if (CfgHdr->LatencyTimer < 32) {
    CfgHdr->LatencyTimer = 32;
    PciIoFncs->Pci.Write (
                    PciIoFncs,
                    EfiPciIoWidthUint8,
                    PCI_LATENCY_TIMER,
                    1,
                    &CfgHdr->LatencyTimer
                    );
  }
  //
  // the IfNum index for the current interface will be the total number
  // of interfaces initialized so far
  //
  UNDI32Device->NIIProtocol_31.IfNum  = pxe_31->IFcnt | pxe_31->IFcntExt << 8;

  PxeUpdate (&UNDI32Device->NicInfo, pxe_31);

  UNDI32Device->NicInfo.Io_Function                    = PciIoFncs;
  UNDI32DeviceList[UNDI32Device->NIIProtocol_31.IfNum] = UNDI32Device;
  UNDI32Device->Undi32BaseDevPath                      = UndiDevicePath;

  Status = AppendMac2DevPath (
            &UNDI32Device->Undi32DevPath,
            UNDI32Device->Undi32BaseDevPath,
            &UNDI32Device->NicInfo
            );

  if (Status != 0) {
    goto UndiErrorDeletePxe;
  }

  UNDI32Device->Signature                     = UNDI_DEV_SIGNATURE;

  UNDI32Device->NIIProtocol_31.Revision       = EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL_REVISION_31;
  UNDI32Device->NIIProtocol_31.Type           = EfiNetworkInterfaceUndi;
  UNDI32Device->NIIProtocol_31.MajorVer       = PXE_ROMID_MAJORVER;
  UNDI32Device->NIIProtocol_31.MinorVer       = PXE_ROMID_MINORVER_31;
  UNDI32Device->NIIProtocol_31.ImageSize      = 0;
  UNDI32Device->NIIProtocol_31.ImageAddr      = 0;
  UNDI32Device->NIIProtocol_31.Ipv6Supported  = FALSE;

  UNDI32Device->NIIProtocol_31.StringId[0]    = 'U';
  UNDI32Device->NIIProtocol_31.StringId[1]    = 'N';
  UNDI32Device->NIIProtocol_31.StringId[2]    = 'D';
  UNDI32Device->NIIProtocol_31.StringId[3]    = 'I';

  UNDI32Device->DeviceHandle                  = NULL;

  //
  // install both the 3.0 and 3.1 NII protocols.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &UNDI32Device->DeviceHandle,
                  &gEfiNetworkInterfaceIdentifierProtocolGuid_31,
                  &UNDI32Device->NIIProtocol_31,
                  &gEfiDevicePathProtocolGuid,
                  UNDI32Device->Undi32DevPath,
                  NULL
                  );

  if (EFI_ERROR (Status)) {
    goto UndiErrorDeleteDevicePath;
  }

  //
  // if the table exists, free it and alloc again, or alloc it directly
  //
  if (UndiDataPointer != NULL) {
    Status = gBS->FreePool(UndiDataPointer);
  }
  if (EFI_ERROR (Status)) {
    goto UndiErrorDeleteDevicePath;
  }

  Len = ((pxe_31->IFcnt|pxe_31->IFcntExt << 8)* sizeof (UndiDataPointer->NII_entry)) + sizeof (UndiDataPointer);
  Status = gBS->AllocatePool (EfiRuntimeServicesData, Len, (VOID **) &UndiDataPointer);

  if (EFI_ERROR (Status)) {
    goto UndiErrorAllocDataPointer;
  }

  //
  // Open For Child Device
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIoFncs,
                  This->DriverBindingHandle,
                  UNDI32Device->DeviceHandle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );

  return EFI_SUCCESS;
UndiErrorAllocDataPointer:
  gBS->UninstallMultipleProtocolInterfaces (
                  &UNDI32Device->DeviceHandle,
                  &gEfiNetworkInterfaceIdentifierProtocolGuid_31,
                  &UNDI32Device->NIIProtocol_31,
                  &gEfiDevicePathProtocolGuid,
                  UNDI32Device->Undi32DevPath,
                  NULL
                  );

UndiErrorDeleteDevicePath:
  UNDI32DeviceList[UNDI32Device->NIIProtocol_31.IfNum] = NULL;
  gBS->FreePool (UNDI32Device->Undi32DevPath);

UndiErrorDeletePxe:
  PxeUpdate (NULL, pxe_31);
  if (TmpPxePointer != NULL) {
    gBS->FreePool (TmpPxePointer);

  }

UndiErrorDeleteDevice:
  if (PciAttributesSaved) {
    //
    // Restore original PCI attributes
    //
    PciIoFncs->Attributes (
                    PciIoFncs,
                    EfiPciIoAttributeOperationSet,
                    UNDI32Device->NicInfo.OriginalPciAttributes,
                    NULL
                    );
  }

  gBS->FreePool (UNDI32Device);

UndiError:
  gBS->CloseProtocol (
        Controller,
        &gEfiDevicePathProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  gBS->CloseProtocol (
        Controller,
        &gEfiPciIoProtocolGuid,
        This->DriverBindingHandle,
        Controller
        );

  return Status;
}


/**
  Stop this driver on Controller by removing NetworkInterfaceIdentifier protocol and
  closing the DevicePath and PciIo protocols on Controller.

  @param  This                 Protocol instance pointer.
  @param  Controller           Handle of device to stop driver on.
  @param  NumberOfChildren     How many children need to be stopped.
  @param  ChildHandleBuffer    Not used.

  @retval EFI_SUCCESS          This driver is removed Controller.
  @retval other                This driver was not removed from this device.

**/
// TODO:    EFI_DEVICE_ERROR - add return value to function comment
EFI_STATUS
EFIAPI
UndiDriverStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN  EFI_HANDLE                     Controller,
  IN  UINTN                          NumberOfChildren,
  IN  EFI_HANDLE                     *ChildHandleBuffer
  )
{
  EFI_STATUS                                Status;
  BOOLEAN                                   AllChildrenStopped;
  UINTN                                     Index;
  UNDI32_DEV                                *UNDI32Device;
  EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL *NIIProtocol;

  //
  // Complete all outstanding transactions to Controller.
  // Don't allow any new transaction to Controller to be started.
  //
  if (NumberOfChildren == 0) {

    //
    // Close the bus driver
    //
    Status = gBS->CloseProtocol (
                    Controller,
                    &gEfiDevicePathProtocolGuid,
                    This->DriverBindingHandle,
                    Controller
                    );

    Status = gBS->CloseProtocol (
                    Controller,
                    &gEfiPciIoProtocolGuid,
                    This->DriverBindingHandle,
                    Controller
                    );

    return Status;
  }

  AllChildrenStopped = TRUE;

  for (Index = 0; Index < NumberOfChildren; Index++) {

    Status = gBS->OpenProtocol (
                    ChildHandleBuffer[Index],
                    &gEfiNetworkInterfaceIdentifierProtocolGuid_31,
                    (VOID **) &NIIProtocol,
                    This->DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );
    if (!EFI_ERROR (Status)) {

      UNDI32Device = UNDI_DEV_FROM_THIS (NIIProtocol);

      Status = gBS->CloseProtocol (
                      Controller,
                      &gEfiPciIoProtocolGuid,
                      This->DriverBindingHandle,
                      ChildHandleBuffer[Index]
                      );
      if (!EFI_ERROR (Status)) {
        Status = gBS->UninstallMultipleProtocolInterfaces (
                        ChildHandleBuffer[Index],
                        &gEfiDevicePathProtocolGuid,
                        UNDI32Device->Undi32DevPath,
                        &gEfiNetworkInterfaceIdentifierProtocolGuid_31,
                        &UNDI32Device->NIIProtocol_31,
                        NULL
                        );
        if (!EFI_ERROR (Status)) {
          //
          // Restore original PCI attributes
          //
          Status = UNDI32Device->NicInfo.Io_Function->Attributes (
                                                        UNDI32Device->NicInfo.Io_Function,
                                                        EfiPciIoAttributeOperationSet,
                                                        UNDI32Device->NicInfo.OriginalPciAttributes,
                                                        NULL
                                                        );

          ASSERT_EFI_ERROR (Status);

          gBS->FreePool (UNDI32Device->Undi32DevPath);
          gBS->FreePool (UNDI32Device);

        }
      }
    }

    if (EFI_ERROR (Status)) {
      AllChildrenStopped = FALSE;
    }
  }

  if (!AllChildrenStopped) {
    return EFI_DEVICE_ERROR;
  }

  return EFI_SUCCESS;

}


/**
  Use the EFI boot services to produce a pause. This is also the routine which
  gets replaced during RunTime by the O/S in the NIC_DATA_INSTANCE so it can
  do it's own pause.

  @param  UnqId                Runtime O/S routine might use this, this temp
                               routine does not use it
  @param  MicroSeconds         Determines the length of pause.

  @return none

**/
VOID
TmpDelay (
  IN UINT64 UnqId,
  IN UINTN  MicroSeconds
  )
{
  gBS->Stall ((UINT32) MicroSeconds);
}


/**
  Use the PCI IO abstraction to issue memory or I/O reads and writes.  This is also the routine which
  gets replaced during RunTime by the O/S in the NIC_DATA_INSTANCE so it can do it's own I/O abstractions.

  @param  UnqId                Runtime O/S routine may use this field, this temp
                               routine does not.
  @param  ReadWrite            Determine if it is an I/O or Memory Read/Write
                               Operation.
  @param  Len                  Determines the width of the data operation.
  @param  Port                 What port to Read/Write from.
  @param  BuffAddr             Address to read to or write from.

  @return none

**/
VOID
TmpMemIo (
  IN UINT64 UnqId,
  IN UINT8  ReadWrite,
  IN UINT8  Len,
  IN UINT64 Port,
  IN UINT64 BuffAddr
  )
{
  EFI_PCI_IO_PROTOCOL_WIDTH Width;
  NIC_DATA_INSTANCE         *AdapterInfo;

  Width       = (EFI_PCI_IO_PROTOCOL_WIDTH) 0;
  AdapterInfo = (NIC_DATA_INSTANCE *) (UINTN) UnqId;
  switch (Len) {
  case 2:
    Width = (EFI_PCI_IO_PROTOCOL_WIDTH) 1;
    break;

  case 4:
    Width = (EFI_PCI_IO_PROTOCOL_WIDTH) 2;
    break;

  case 8:
    Width = (EFI_PCI_IO_PROTOCOL_WIDTH) 3;
    break;
  }

  switch (ReadWrite) {
  case PXE_IO_READ:
    AdapterInfo->Io_Function->Io.Read (
                                  AdapterInfo->Io_Function,
                                  Width,
                                  1,
                                  Port,
                                  1,
                                  (VOID *) (UINTN) (BuffAddr)
                                  );
    break;

  case PXE_IO_WRITE:
    AdapterInfo->Io_Function->Io.Write (
                                  AdapterInfo->Io_Function,
                                  Width,
                                  1,
                                  Port,
                                  1,
                                  (VOID *) (UINTN) (BuffAddr)
                                  );
    break;

  case PXE_MEM_READ:
    AdapterInfo->Io_Function->Mem.Read (
                                    AdapterInfo->Io_Function,
                                    Width,
                                    0,
                                    Port,
                                    1,
                                    (VOID *) (UINTN) (BuffAddr)
                                    );
    break;

  case PXE_MEM_WRITE:
    AdapterInfo->Io_Function->Mem.Write (
                                    AdapterInfo->Io_Function,
                                    Width,
                                    0,
                                    Port,
                                    1,
                                    (VOID *) (UINTN) (BuffAddr)
                                    );
    break;
  }

  return ;
}


/**
  Using the NIC data structure information, read the EEPROM to get the MAC address and then allocate space
  for a new devicepath (**DevPtr) which will contain the original device path the NIC was found on (*BaseDevPtr)
  and an added MAC node.

  @param  DevPtr               Pointer which will point to the newly created device
                               path with the MAC node attached.
  @param  BaseDevPtr           Pointer to the device path which the UNDI device
                               driver is latching on to.
  @param  AdapterInfo          Pointer to the NIC data structure information which
                               the UNDI driver is layering on..

  @retval EFI_SUCCESS          A MAC address was successfully appended to the Base
                               Device Path.
  @retval other                Not enough resources available to create new Device
                               Path node.

**/
EFI_STATUS
AppendMac2DevPath (
  IN OUT  EFI_DEVICE_PATH_PROTOCOL **DevPtr,
  IN      EFI_DEVICE_PATH_PROTOCOL *BaseDevPtr,
  IN      NIC_DATA_INSTANCE        *AdapterInfo
  )
{
  EFI_MAC_ADDRESS           MACAddress;
  PCI_CONFIG_HEADER         *CfgHdr;
  INT32                     Val;
  INT32                     Index;
  INT32                     Index2;
  UINT8                     AddrLen;
  MAC_ADDR_DEVICE_PATH      MacAddrNode;
  EFI_DEVICE_PATH_PROTOCOL  *EndNode;
  UINT8                     *DevicePtr;
  UINT16                    TotalPathLen;
  UINT16                    BasePathLen;
  EFI_STATUS                Status;

  //
  // set the environment ready (similar to UNDI_Start call) so that we can
  // execute the other UNDI_ calls to get the mac address
  // we are using undi 3.1 style
  //
  AdapterInfo->Delay      = TmpDelay;
  AdapterInfo->Virt2Phys  = (VOID *) 0;
  AdapterInfo->Block      = (VOID *) 0;
  AdapterInfo->Map_Mem    = (VOID *) 0;
  AdapterInfo->UnMap_Mem  = (VOID *) 0;
  AdapterInfo->Sync_Mem   = (VOID *) 0;
  AdapterInfo->Mem_Io     = TmpMemIo;
  //
  // these tmp call-backs follow 3.1 undi style
  // i.e. they have the unique_id parameter.
  //
  AdapterInfo->VersionFlag  = 0x31;
  AdapterInfo->Unique_ID    = (UINT64) (UINTN) AdapterInfo;

  //
  // undi init portion
  //
  CfgHdr              = (PCI_CONFIG_HEADER *) &(AdapterInfo->Config[0]);
  AdapterInfo->ioaddr = 0;
  AdapterInfo->RevID  = CfgHdr->RevID;

  AddrLen             = E100bGetEepromAddrLen (AdapterInfo);

  for (Index = 0, Index2 = 0; Index < 3; Index++) {
    Val                       = E100bReadEeprom (AdapterInfo, Index, AddrLen);
    MACAddress.Addr[Index2++] = (UINT8) Val;
    MACAddress.Addr[Index2++] = (UINT8) (Val >> 8);
  }

  SetMem (MACAddress.Addr + Index2, sizeof (EFI_MAC_ADDRESS) - Index2, 0);
  //for (; Index2 < sizeof (EFI_MAC_ADDRESS); Index2++) {
  //  MACAddress.Addr[Index2] = 0;
  //}
  //
  // stop undi
  //
  AdapterInfo->Delay  = (VOID *) 0;
  AdapterInfo->Mem_Io = (VOID *) 0;

  //
  // fill the mac address node first
  //
  ZeroMem ((CHAR8 *) &MacAddrNode, sizeof MacAddrNode);
  CopyMem (
    (CHAR8 *) &MacAddrNode.MacAddress,
    (CHAR8 *) &MACAddress,
    sizeof (EFI_MAC_ADDRESS)
    );

  MacAddrNode.Header.Type       = MESSAGING_DEVICE_PATH;
  MacAddrNode.Header.SubType    = MSG_MAC_ADDR_DP;
  MacAddrNode.Header.Length[0]  = (UINT8) sizeof (MacAddrNode);
  MacAddrNode.Header.Length[1]  = 0;

  //
  // find the size of the base dev path.
  //
  EndNode = BaseDevPtr;

  while (!IsDevicePathEnd (EndNode)) {
    EndNode = NextDevicePathNode (EndNode);
  }

  BasePathLen = (UINT16) ((UINTN) (EndNode) - (UINTN) (BaseDevPtr));

  //
  // create space for full dev path
  //
  TotalPathLen = (UINT16) (BasePathLen + sizeof (MacAddrNode) + sizeof (EFI_DEVICE_PATH_PROTOCOL));

  Status = gBS->AllocatePool (
                  EfiRuntimeServicesData,
                  TotalPathLen,
                  (VOID **) &DevicePtr
                  );

  if (Status != EFI_SUCCESS) {
    return Status;
  }
  //
  // copy the base path, mac addr and end_dev_path nodes
  //
  *DevPtr = (EFI_DEVICE_PATH_PROTOCOL *) DevicePtr;
  CopyMem (DevicePtr, (CHAR8 *) BaseDevPtr, BasePathLen);
  DevicePtr += BasePathLen;
  CopyMem (DevicePtr, (CHAR8 *) &MacAddrNode, sizeof (MacAddrNode));
  DevicePtr += sizeof (MacAddrNode);
  CopyMem (DevicePtr, (CHAR8 *) EndNode, sizeof (EFI_DEVICE_PATH_PROTOCOL));

  return EFI_SUCCESS;
}


/**
  Install a GUID/Pointer pair into the system's configuration table.

  none

  @retval EFI_SUCCESS          Install a GUID/Pointer pair into the system's
                               configuration table.
  @retval other                Did not successfully install the GUID/Pointer pair
                               into the configuration table.

**/
// TODO:    VOID - add argument and description to function comment
EFI_STATUS
InstallConfigTable (
  IN VOID
  )
{
  EFI_STATUS              Status;
  EFI_CONFIGURATION_TABLE *CfgPtr;
  UNDI_CONFIG_TABLE       *TmpData;
  UINT16                  Index;
  UNDI_CONFIG_TABLE       *UndiData;

  if (pxe_31 == NULL) {
    return EFI_SUCCESS;
  }

  if(UndiDataPointer == NULL) {
    return EFI_SUCCESS;
  }

  UndiData = (UNDI_CONFIG_TABLE *)UndiDataPointer;

  UndiData->NumberOfInterfaces  = (pxe_31->IFcnt | pxe_31->IFcntExt << 8);
  UndiData->nextlink            = NULL;

  for (Index = 0; Index < (pxe_31->IFcnt | pxe_31->IFcntExt << 8); Index++) {
    UndiData->NII_entry[Index].NII_InterfacePointer = &UNDI32DeviceList[Index]->NIIProtocol_31;
    UndiData->NII_entry[Index].DevicePathPointer    = UNDI32DeviceList[Index]->Undi32DevPath;
  }

  //
  // see if there is an entry in the config table already
  //
  CfgPtr = gST->ConfigurationTable;

  for (Index = 0; Index < gST->NumberOfTableEntries; Index++) {
    Status = CompareGuid (
              &CfgPtr->VendorGuid,
              &gEfiNetworkInterfaceIdentifierProtocolGuid_31
              );
    if (Status != EFI_SUCCESS) {
      break;
    }

    CfgPtr++;
  }

  if (Index < gST->NumberOfTableEntries) {
    TmpData = (UNDI_CONFIG_TABLE *) CfgPtr->VendorTable;

    //
    // go to the last link
    //
    while (TmpData->nextlink != NULL) {
      TmpData = TmpData->nextlink;
    }

    TmpData->nextlink = UndiData;

    //
    // 1st one in chain
    //
    UndiData = (UNDI_CONFIG_TABLE *) CfgPtr->VendorTable;
  }

  //
  // create an entry in the configuration table for our GUID
  //
  Status = gBS->InstallConfigurationTable (
                  &gEfiNetworkInterfaceIdentifierProtocolGuid_31,
                  UndiData
                  );
  return Status;
}

/**

**/
EFI_STATUS
EFIAPI
InitializeUndi(
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
{
  EFI_EVENT     Event;
  EFI_STATUS    Status;

  Status = EfiLibInstallDriverBindingComponentName2 (
             ImageHandle,
             SystemTable,
             &gUndiDriverBinding,
             ImageHandle,
             &gUndiComponentName,
             &gUndiComponentName2
             );
  ASSERT_EFI_ERROR (Status);

  Status = gBS->CreateEventEx (
                  EVT_NOTIFY_SIGNAL,
                  TPL_NOTIFY,
                  UndiNotifyExitBs,
                  NULL,
                  &gEfiEventExitBootServicesGuid,
                  &Event
                  );
  ASSERT_EFI_ERROR (Status);

  Status = gBS->CreateEventEx (
                  EVT_NOTIFY_SIGNAL,
                  TPL_NOTIFY,
                  UndiNotifyVirtual,
                  NULL,
                  &gEfiEventVirtualAddressChangeGuid,
                  &Event
                  );
  ASSERT_EFI_ERROR (Status);

  return Status;
}