Unix version of EFI emulator

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2182 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 798 insertions, 0 deletions

diff --git a/EdkUnixPkg/Library/EdkGenericBdsLib/BdsBoot.c.orig b/EdkUnixPkg/Library/EdkGenericBdsLib/BdsBoot.c.orig
new file mode 100644
index 0000000000..574c52836d
--- /dev/null
+++ b/EdkUnixPkg/Library/EdkGenericBdsLib/BdsBoot.c.orig
@@ -0,0 +1,798 @@
+/*++

+

+Copyright (c) 2006, Intel Corporation                                                         

+All rights reserved. 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.             

+

+Module Name:

+

+  BdsBoot.c

+

+Abstract:

+

+  BDS Lib functions which relate with create or process the boot

+  option.

+

+--*/

+#include "Performance.h"

+

+BOOLEAN mEnumBootDevice = FALSE;

+

+EFI_STATUS

+BdsLibDoLegacyBoot (

+  IN  BDS_COMMON_OPTION           *Option

+  )

+/*++

+

+Routine Description:

+ 

+  Boot the legacy system with the boot option

+

+Arguments:

+

+  Option           - The legacy boot option which have BBS device path

+

+Returns:

+

+  EFI_UNSUPPORTED  - There is no legacybios protocol, do not support

+                     legacy boot.

+                         

+  EFI_STATUS       - Return the status of LegacyBios->LegacyBoot ().

+

+--*/

+{

+  EFI_STATUS                Status;

+  EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;

+

+  Status = gBS->LocateProtocol (&gEfiLegacyBiosProtocolGuid, NULL,
+				(void **)&LegacyBios);

+  if (EFI_ERROR (Status)) {

+    //

+    // If no LegacyBios protocol we do not support legacy boot

+    //

+    return EFI_UNSUPPORTED;

+  }

+  //

+  // Notes: if we seperate the int 19, then we don't need to refresh BBS

+  //

+  BdsRefreshBbsTableForBoot (Option);

+

+  //

+  // Write boot to OS performance data to a file

+  //

+  PERF_CODE (

+    WriteBootToOsPerformanceData ();

+  );

+

+

+  DEBUG ((EFI_D_INFO | EFI_D_LOAD, "Legacy Boot: %S\n", Option->Description));

+  return LegacyBios->LegacyBoot (

+                      LegacyBios,

+                      (BBS_BBS_DEVICE_PATH *) Option->DevicePath,

+                      Option->LoadOptionsSize,

+                      Option->LoadOptions

+                      );

+}

+

+EFI_STATUS

+BdsLibBootViaBootOption (

+  IN  BDS_COMMON_OPTION             * Option,

+  IN  EFI_DEVICE_PATH_PROTOCOL      * DevicePath,

+  OUT UINTN                         *ExitDataSize,

+  OUT CHAR16                        **ExitData OPTIONAL

+  )

+/*++

+

+Routine Description:

+

+  Process the boot option follow the EFI 1.1 specification and 

+  special treat the legacy boot option with BBS_DEVICE_PATH.

+

+Arguments:

+

+  Option       - The boot option need to be processed

+  

+  DevicePath   - The device path which describe where to load 

+                 the boot image or the legcy BBS device path 

+                 to boot the legacy OS

+

+  ExitDataSize - Returned directly from gBS->StartImage ()

+

+  ExitData     - Returned directly from gBS->StartImage ()

+

+Returns:

+

+  EFI_SUCCESS   - Status from gBS->StartImage (),

+                  or BdsBootByDiskSignatureAndPartition ()

+

+  EFI_NOT_FOUND - If the Device Path is not found in the system

+

+--*/

+{

+  EFI_STATUS                Status;

+  EFI_HANDLE                Handle;

+  EFI_HANDLE                ImageHandle;

+  EFI_DEVICE_PATH_PROTOCOL  *TempDevicePath;

+  EFI_DEVICE_PATH_PROTOCOL  *FilePath;

+  EFI_LOADED_IMAGE_PROTOCOL *ImageInfo;

+  EFI_ACPI_S3_SAVE_PROTOCOL *AcpiS3Save;

+

+  *ExitDataSize = 0;

+  *ExitData     = NULL;

+

+  //

+  // Notes: put EFI64 ROM Shadow Solution

+  //

+  EFI64_SHADOW_ALL_LEGACY_ROM ();

+

+  //

+  // Notes: this code can be remove after the s3 script table

+  // hook on the event EFI_EVENT_SIGNAL_READY_TO_BOOT or

+  // EFI_EVENT_SIGNAL_LEGACY_BOOT

+  //

+  Status = gBS->LocateProtocol (&gEfiAcpiS3SaveProtocolGuid, NULL,
+				(VOID **)&AcpiS3Save);

+  if (!EFI_ERROR (Status)) {

+    AcpiS3Save->S3Save (AcpiS3Save, NULL);

+  }

+  //

+  // If it's Device Path that starts with a hard drive path,

+  // this routine will do the booting.

+  //

+  Status = BdsBootByDiskSignatureAndPartition (

+            Option,

+            (HARDDRIVE_DEVICE_PATH *) DevicePath,

+            Option->LoadOptionsSize,

+            Option->LoadOptions,

+            ExitDataSize,

+            ExitData

+            );

+  if (!EFI_ERROR (Status)) {

+    //

+    // If we found a disk signature and partition device path return success

+    //

+    return EFI_SUCCESS;

+  }

+

+  EfiSignalEventReadyToBoot ();

+

+  //

+  // Set Boot Current

+  //

+  gRT->SetVariable (

+        L"BootCurrent",

+        &gEfiGlobalVariableGuid,

+        EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,

+        sizeof (UINT16),

+        &Option->BootCurrent

+        );

+

+  if ((DevicePathType (Option->DevicePath) == BBS_DEVICE_PATH) &&

+      (DevicePathSubType (Option->DevicePath) == BBS_BBS_DP)

+    ) {

+    //

+    // Check to see if we should legacy BOOT. If yes then do the legacy boot

+    //

+    return BdsLibDoLegacyBoot (Option);

+  }

+

+  DEBUG ((EFI_D_INFO | EFI_D_LOAD, "Booting EFI 1.1 way %S\n", Option->Description));

+

+  Status = gBS->LoadImage (

+                  TRUE,

+                  mBdsImageHandle,

+                  DevicePath,

+                  NULL,

+                  0,

+                  &ImageHandle

+                  );

+

+  //

+  // If we didn't find an image, we may need to load the default

+  // boot behavior for the device.

+  //

+  if (EFI_ERROR (Status)) {

+    //

+    // Find a Simple File System protocol on the device path. If the remaining

+    // device path is set to end then no Files are being specified, so try

+    // the removable media file name.

+    //

+    TempDevicePath = DevicePath;

+    Status = gBS->LocateDevicePath (

+                    &gEfiSimpleFileSystemProtocolGuid,

+                    &TempDevicePath,

+                    &Handle

+                    );

+    if (!EFI_ERROR (Status) && IsDevicePathEnd (TempDevicePath)) {

+      FilePath = FileDevicePath (Handle, EFI_REMOVABLE_MEDIA_FILE_NAME);

+      if (FilePath) {

+        Status = gBS->LoadImage (

+                        TRUE,

+                        mBdsImageHandle,

+                        FilePath,

+                        NULL,

+                        0,

+                        &ImageHandle

+                        );

+        if (EFI_ERROR (Status)) {

+          //

+          // The DevicePath failed, and it's not a valid

+          // removable media device.

+          //

+          goto Done;

+        }

+      }

+    } else {

+      Status = EFI_NOT_FOUND;

+    }

+  }

+

+  if (EFI_ERROR (Status)) {

+    //

+    // It there is any error from the Boot attempt exit now.

+    //

+    goto Done;

+  }

+  //

+  // Provide the image with it's load options

+  //

+  Status = gBS->HandleProtocol (ImageHandle, &gEfiLoadedImageProtocolGuid,
+				(VOID **) &ImageInfo);

+  ASSERT_EFI_ERROR (Status);

+

+  if (Option->LoadOptionsSize != 0) {

+    ImageInfo->LoadOptionsSize  = Option->LoadOptionsSize;

+    ImageInfo->LoadOptions      = Option->LoadOptions;

+  }

+  //

+  // Before calling the image, enable the Watchdog Timer for

+  // the 5 Minute period

+  //

+  gBS->SetWatchdogTimer (5 * 60, 0x0000, 0x00, NULL);

+

+  Status = gBS->StartImage (ImageHandle, ExitDataSize, ExitData);

+  DEBUG ((EFI_D_INFO | EFI_D_LOAD, "Image Return Status = %r\n", Status));

+

+  //

+  // Clear the Watchdog Timer after the image returns

+  //

+  gBS->SetWatchdogTimer (0x0000, 0x0000, 0x0000, NULL);

+

+Done:

+  //

+  // Clear Boot Current

+  //

+  gRT->SetVariable (

+        L"BootCurrent",

+        &gEfiGlobalVariableGuid,

+        EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,

+        0,

+        &Option->BootCurrent

+        );

+

+  return Status;

+}

+

+EFI_STATUS

+BdsBootByDiskSignatureAndPartition (

+  IN  BDS_COMMON_OPTION          * Option,

+  IN  HARDDRIVE_DEVICE_PATH      * HardDriveDevicePath,

+  IN  UINT32                     LoadOptionsSize,

+  IN  VOID                       *LoadOptions,

+  OUT UINTN                      *ExitDataSize,

+  OUT CHAR16                     **ExitData OPTIONAL

+  )

+/*++

+

+Routine Description:

+

+  Check to see if a hard ware device path was passed in. If it was then search

+  all the block IO devices for the passed in hard drive device path. 

+  

+Arguments:

+

+  Option - The current processing boot option.

+

+  HardDriveDevicePath - EFI Device Path to boot, if it starts with a hard

+                        drive device path.

+

+  LoadOptionsSize - Passed into gBS->StartImage ()

+                    via the loaded image protocol.

+

+  LoadOptions     - Passed into gBS->StartImage ()

+                    via the loaded image protocol.

+

+  ExitDataSize - returned directly from gBS->StartImage ()

+

+  ExitData     - returned directly from gBS->StartImage ()

+

+Returns:

+

+  EFI_SUCCESS   - Status from gBS->StartImage (),

+                  or BootByDiskSignatureAndPartition ()

+                  

+  EFI_NOT_FOUND - If the Device Path is not found in the system

+

+--*/

+{

+  EFI_STATUS                Status;

+  UINTN                     BlockIoHandleCount;

+  EFI_HANDLE                *BlockIoBuffer;

+  EFI_DEVICE_PATH_PROTOCOL  *BlockIoDevicePath;

+  EFI_DEVICE_PATH_PROTOCOL  *BlockIoHdDevicePath;

+  HARDDRIVE_DEVICE_PATH     *TmpHdPath;

+  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;

+  EFI_DEVICE_PATH_PROTOCOL  *NewDevicePath;

+  UINTN                     Index;

+  BOOLEAN                   DevicePathMatch;

+  HARDDRIVE_DEVICE_PATH     *TempPath;

+

+  *ExitDataSize = 0;

+  *ExitData     = NULL;

+

+  if ( !((DevicePathType (&HardDriveDevicePath->Header) == MEDIA_DEVICE_PATH) &&

+          (DevicePathSubType (&HardDriveDevicePath->Header) == MEDIA_HARDDRIVE_DP))

+        ) {

+    //

+    // If the HardDriveDevicePath does not start with a Hard Drive Device Path

+    // exit.

+    //

+    return EFI_NOT_FOUND;

+  }

+  //

+  // The boot device have already been connected

+  //

+  Status = gBS->LocateHandleBuffer (ByProtocol, &gEfiBlockIoProtocolGuid, NULL, &BlockIoHandleCount, &BlockIoBuffer);

+  if (EFI_ERROR (Status) || BlockIoHandleCount == 0) {

+    //

+    // If there was an error or there are no device handles that support

+    // the BLOCK_IO Protocol, then return.

+    //

+    return EFI_NOT_FOUND;

+  }

+  //

+  // Loop through all the device handles that support the BLOCK_IO Protocol

+  //

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

+

+    Status = gBS->HandleProtocol (BlockIoBuffer[Index], &gEfiDevicePathProtocolGuid, (VOID *) &BlockIoDevicePath);

+    if (EFI_ERROR (Status) || BlockIoDevicePath == NULL) {

+      continue;

+    }

+    //

+    // Make PreviousDevicePath == the device path node before the end node

+    //

+    DevicePath          = BlockIoDevicePath;

+    BlockIoHdDevicePath = NULL;

+

+    //

+    // find HardDriver device path node

+    //

+    while (!IsDevicePathEnd (DevicePath)) {

+      if ((DevicePathType (DevicePath) == MEDIA_DEVICE_PATH) && 

+          (DevicePathSubType (DevicePath) == MEDIA_HARDDRIVE_DP)

+          ) {

+        BlockIoHdDevicePath = DevicePath;

+        break;

+      }

+

+      DevicePath = NextDevicePathNode (DevicePath);

+    }

+

+    if (BlockIoHdDevicePath == NULL) {

+      continue;

+    }

+    //

+    // See if the harddrive device path in blockio matches the orig Hard Drive Node

+    //

+    DevicePathMatch = FALSE;

+

+    TmpHdPath       = (HARDDRIVE_DEVICE_PATH *) BlockIoHdDevicePath;

+    TempPath        = (HARDDRIVE_DEVICE_PATH *) BdsLibUnpackDevicePath ((EFI_DEVICE_PATH_PROTOCOL *) HardDriveDevicePath);

+

+    //

+    // Only several fields will be checked. NOT whole NODE

+    //

+    if ( TmpHdPath->PartitionNumber == TempPath->PartitionNumber &&

+        TmpHdPath->MBRType == TempPath->MBRType &&

+        TmpHdPath->SignatureType == TempPath->SignatureType &&

+        CompareGuid ((EFI_GUID *) TmpHdPath->Signature, (EFI_GUID *) TempPath->Signature)) {

+      //

+      // Get the matched device path

+      //

+      DevicePathMatch = TRUE;

+    }

+    //

+    // Only do the boot, when devicepath match

+    //

+    if (DevicePathMatch) {

+      //

+      // Combine the Block IO and Hard Drive Device path together and try

+      // to boot from it.

+      //

+      DevicePath    = NextDevicePathNode ((EFI_DEVICE_PATH_PROTOCOL *) HardDriveDevicePath);

+      NewDevicePath = AppendDevicePath (BlockIoDevicePath, DevicePath);

+

+      //

+      // Recursive boot with new device path

+      //

+      Status = BdsLibBootViaBootOption (Option, NewDevicePath, ExitDataSize, ExitData);

+      if (!EFI_ERROR (Status)) {

+        break;

+      }

+    }

+  }

+

+  gBS->FreePool (BlockIoBuffer);

+  return Status;

+}

+

+EFI_STATUS

+BdsLibEnumerateAllBootOption (

+  IN OUT LIST_ENTRY      *BdsBootOptionList

+  )

+/*++

+

+Routine Description:

+

+  This function will enumerate all possible boot device in the system,

+  it will only excute once of every boot.

+

+Arguments:

+

+  BdsBootOptionList - The header of the link list which indexed all

+                      current boot options

+

+Returns:

+

+  EFI_SUCCESS - Finished all the boot device enumerate and create

+                the boot option base on that boot device

+

+--*/

+{

+  EFI_STATUS                    Status;

+  UINT16                        BootOptionNumber;

+  UINTN                         NumberFileSystemHandles;

+  EFI_HANDLE                    *FileSystemHandles;

+  UINTN                         NumberBlkIoHandles;

+  EFI_HANDLE                    *BlkIoHandles;

+  EFI_BLOCK_IO_PROTOCOL         *BlkIo;

+  UINTN                         Index;

+  EFI_DEVICE_PATH_PROTOCOL      *DevicePath;

+  UINTN                         NumberLoadFileHandles;

+  EFI_HANDLE                    *LoadFileHandles;

+  VOID                          *ProtocolInstance;

+  EFI_FIRMWARE_VOLUME_PROTOCOL  *Fv;

+  UINTN                         FvHandleCount;

+  EFI_HANDLE                    *FvHandleBuffer;

+  EFI_FV_FILETYPE               Type;

+  UINTN                         Size;

+  EFI_FV_FILE_ATTRIBUTES        Attributes;

+  UINT32                        AuthenticationStatus;

+

+  BootOptionNumber = 0;

+

+  //

+  // If the boot device enumerate happened, just get the boot

+  // device from the boot order variable

+  //

+  if (mEnumBootDevice) {

+    BdsLibBuildOptionFromVar (BdsBootOptionList, L"BootOrder");

+    return EFI_SUCCESS;

+  }

+  //

+  // Notes: this dirty code is to get the legacy boot option from the

+  // BBS table and create to variable as the EFI boot option, it should

+  // be removed after the CSM can provide legacy boot option directly

+  //

+  REFRESH_LEGACY_BOOT_OPTIONS;

+

+  //

+  // Check all the block IO to create boot option

+  //

+  gBS->LocateHandleBuffer (

+        ByProtocol,

+        &gEfiBlockIoProtocolGuid,

+        NULL,

+        &NumberBlkIoHandles,

+        &BlkIoHandles

+        );

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

+    Status = gBS->HandleProtocol (

+                    BlkIoHandles[Index],

+                    &gEfiBlockIoProtocolGuid,

+                    (VOID **) &BlkIo

+                    );

+    if (EFI_ERROR (Status)) {

+      continue;

+    }

+

+    if (!BlkIo->Media->RemovableMedia) {

+      //

+      // Skip fixed Media device on first loop interration

+      //

+      continue;

+    }

+

+    DevicePath = DevicePathFromHandle (BlkIoHandles[Index]);

+    if ((DevicePathType (DevicePath) == MEDIA_DEVICE_PATH) && 

+        (DevicePathSubType (DevicePath) == MEDIA_HARDDRIVE_DP)

+        ) {

+      //

+      // Build the boot option

+      //

+      BdsLibBuildOptionFromHandle (BlkIoHandles[Index], BdsBootOptionList);

+      BootOptionNumber++;

+    }

+  }

+

+  if (NumberBlkIoHandles) {

+    gBS->FreePool (BlkIoHandles);

+  }

+  //

+  // Parse Fixed Disk Devices.

+  //

+  gBS->LocateHandleBuffer (

+        ByProtocol,

+        &gEfiSimpleFileSystemProtocolGuid,

+        NULL,

+        &NumberFileSystemHandles,

+        &FileSystemHandles

+        );

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

+    Status = gBS->HandleProtocol (

+                    FileSystemHandles[Index],

+                    &gEfiBlockIoProtocolGuid,

+                    (VOID **) &BlkIo

+                    );

+    if (!EFI_ERROR (Status)) {

+      if (BlkIo->Media->RemovableMedia) {

+        //

+        // If the file system handle supports a BlkIo protocol,

+        // skip the removable media devices

+        //

+        continue;

+      }

+    }

+

+    DevicePath = DevicePathFromHandle (FileSystemHandles[Index]);

+    if ((DevicePathType (DevicePath) == MEDIA_DEVICE_PATH) && 

+        (DevicePathSubType (DevicePath) == MEDIA_HARDDRIVE_DP)

+        ) {

+      //

+      // If the FileSystem protocol does not contain a BlkIo protocol,

+      // then build it

+      //

+      BdsLibBuildOptionFromHandle (FileSystemHandles[Index], BdsBootOptionList);

+      BootOptionNumber++;

+    }

+  }

+

+  if (NumberFileSystemHandles) {

+    gBS->FreePool (FileSystemHandles);

+  }

+  //

+  // Parse Network Boot Device

+  //

+  gBS->LocateHandleBuffer (

+        ByProtocol,

+        &gEfiSimpleNetworkProtocolGuid,

+        NULL,

+        &NumberLoadFileHandles,

+        &LoadFileHandles

+        );

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

+    Status = gBS->HandleProtocol (

+                    LoadFileHandles[Index],

+                    &gEfiLoadFileProtocolGuid,

+                    (VOID **) &ProtocolInstance

+                    );

+    if (EFI_ERROR (Status)) {

+      continue;

+    }

+

+    BdsLibBuildOptionFromHandle (LoadFileHandles[Index], BdsBootOptionList);

+    BootOptionNumber++;

+  }

+

+  if (NumberLoadFileHandles) {

+    gBS->FreePool (LoadFileHandles);

+  }

+  //

+  // Check if we have on flash shell

+  //

+  gBS->LocateHandleBuffer (

+        ByProtocol,

+        &gEfiFirmwareVolumeProtocolGuid,

+        NULL,

+        &FvHandleCount,

+        &FvHandleBuffer

+        );

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

+    gBS->HandleProtocol (

+          FvHandleBuffer[Index],

+          &gEfiFirmwareVolumeProtocolGuid,

+          (VOID **) &Fv

+          );

+

+    Status = Fv->ReadFile (

+                  Fv,

+                  &gEfiShellFileGuid,

+                  NULL,

+                  &Size,

+                  &Type,

+                  &Attributes,

+                  &AuthenticationStatus

+                  );

+    if (EFI_ERROR (Status)) {

+      //

+      // Skip if no shell file in the FV

+      //

+      continue;

+    }

+    //

+    // Build the shell boot option

+    //

+    BdsLibBuildOptionFromShell (FvHandleBuffer[Index], BdsBootOptionList);

+    BootOptionNumber++;

+  }

+

+  if (FvHandleCount) {

+    gBS->FreePool (FvHandleBuffer);

+  }

+  //

+  // Make sure every boot only have one time

+  // boot device enumerate

+  //

+  BdsLibBuildOptionFromVar (BdsBootOptionList, L"BootOrder");

+  mEnumBootDevice = TRUE;

+

+  return EFI_SUCCESS;

+}

+

+VOID

+BdsLibBuildOptionFromHandle (

+  IN  EFI_HANDLE             Handle,

+  IN  LIST_ENTRY             *BdsBootOptionList

+  )

+/*++

+

+Routine Description:

+  

+  Build the boot option with the handle parsed in

+  

+Arguments:

+

+  Handle - The handle which present the device path to create boot option

+  

+  BdsBootOptionList - The header of the link list which indexed all current

+                      boot options

+

+Returns:

+

+  VOID

+

+--*/

+{

+  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;

+  CHAR16                    *TempString;

+

+  DevicePath  = DevicePathFromHandle (Handle);

+  TempString  = DevicePathToStr (DevicePath);

+

+  //

+  // Create and register new boot option

+  //

+  BdsLibRegisterNewOption (BdsBootOptionList, DevicePath, TempString, L"BootOrder");

+}

+

+VOID

+BdsLibBuildOptionFromShell (

+  IN EFI_HANDLE              Handle,

+  IN OUT LIST_ENTRY          *BdsBootOptionList

+  )

+/*++

+

+Routine Description:

+  

+  Build the on flash shell boot option with the handle parsed in

+  

+Arguments:

+

+  Handle - The handle which present the device path to create on flash shell

+           boot option

+  

+  BdsBootOptionList - The header of the link list which indexed all current

+                      boot options

+

+Returns:

+

+  None

+

+--*/

+{

+  EFI_DEVICE_PATH_PROTOCOL          *DevicePath;

+  MEDIA_FW_VOL_FILEPATH_DEVICE_PATH ShellNode;

+

+  DevicePath = DevicePathFromHandle (Handle);

+

+  //

+  // Build the shell device path

+  //

+  EfiInitializeFwVolDevicepathNode (&ShellNode, &gEfiShellFileGuid);

+  DevicePath = AppendDevicePathNode (DevicePath, (EFI_DEVICE_PATH_PROTOCOL *) &ShellNode);

+

+  //

+  // Create and register the shell boot option

+  //

+  BdsLibRegisterNewOption (BdsBootOptionList, DevicePath, L"Internal EFI Shell", L"BootOrder");

+

+}

+

+VOID

+BdsLibBootNext (

+  VOID

+  )

+/*++

+

+Routine Description:

+  

+  Boot from the EFI1.1 spec defined "BootNext" variable

+  

+Arguments:

+

+  None

+  

+Returns:

+

+  None

+

+--*/

+{

+  UINT16            *BootNext;

+  UINTN             BootNextSize;

+  CHAR16            Buffer[20];

+  BDS_COMMON_OPTION *BootOption;

+  LIST_ENTRY        TempList;

+  UINTN             ExitDataSize;

+  CHAR16            *ExitData;

+

+  //

+  // Init the boot option name buffer and temp link list

+  //

+  InitializeListHead (&TempList);

+  ZeroMem (Buffer, sizeof (Buffer));

+

+  BootNext = BdsLibGetVariableAndSize (

+              L"BootNext",

+              &gEfiGlobalVariableGuid,

+              &BootNextSize

+              );

+

+  //

+  // Clear the boot next variable first

+  //

+  if (BootNext != NULL) {

+    gRT->SetVariable (

+          L"BootNext",

+          &gEfiGlobalVariableGuid,

+          EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,

+          0,

+          BootNext

+          );

+

+    //

+    // Start to build the boot option and try to boot

+    //

+    UnicodeSPrint (Buffer, sizeof (Buffer), L"Boot%04x", *BootNext);

+    BootOption = BdsLibVariableToOption (&TempList, Buffer);

+    BdsLibConnectDevicePath (BootOption->DevicePath);

+    BdsLibBootViaBootOption (BootOption, BootOption->DevicePath, &ExitDataSize, &ExitData);

+  }

+

+}