Step to UEFI (180）GetVbtData 取得 Vbt

#define EFI_PLATFORM_GOP_POLICY_PROTOCOL_GUID \
  { 0xec2e931b, 0x3281, 0x48a5, 0x81, 0x7, 0xdf, 0x8a, 0x8b, 0xed, 0x3c, 0x5d }
#define PLATFORM_GOP_POLICY_PROTOCOL_REVISION_01 0x01
#define PLATFORM_GOP_POLICY_PROTOCOL_REVISION_02 x0222
#pragma pack(1)

typedef enum {
  LidClosed,
  LidOpen,
  LidStatusMax
} LID_STATUS;

typedef enum {
  Docked,
  UnDocked,
  DockStatusMax
} DOCK_STATUS;

typedef
EFI_STATUS
(EFIAPI *GET_PLATFORM_LID_STATUS) (
  OUT LID_STATUS *CurrentLidStatus
  );

typedef
EFI_STATUS
(EFIAPI *GET_VBT_DATA) (
  OUT EFI_PHYSICAL_ADDRESS *VbtAddress,
  OUT UINT32 *VbtSize
  );

#pragma pack()

typedef struct _PLATFORM_GOP_POLICY_PROTOCOL {
  UINT32                             Revision;
  GET_PLATFORM_LID_STATUS            GetPlatformLidStatus;
  GET_VBT_DATA                       GetVbtData;
} PLATFORM_GOP_POLICY_PROTOCOL;

/** @file
    A simple, basic, EDK II native, "hello" application to verify that
    we can build applications without LibC.

    Copyright (c) 2010 - 2011, 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.

    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  <Uefi.h>
#include  <Library/UefiLib.h>
#include  <Library/ShellCEntryLib.h>
#include  <Protocol/SimpleFileSystem.h>
#include  <Library/UefiBootServicesTableLib.h> //global gST gBS gImageHandle
#include  <Library/ShellLib.h>
#include  <Library/IoLib.h>

#include  "PlatformGopPolicy.h"

EFI_GUID gPlatformGOPPolicyGuid      = 
        { 0xec2e931b, 0x3281, 0x48a5, 
                { 0x81, 0x07, 0xdf, 0x8a, 0x8b, 0xed, 0x3c, 0x5d } };

//                        
//Save memory address to a file                        
//
EFI_STATUS 
SaveToFile(
        IN UINT8 *FileData, 
        IN UINTN FileDataLength)
{
    EFI_STATUS          Status;
    EFI_FILE_PROTOCOL   *FileHandle;
    UINTN               BufferSize;
    EFI_FILE_PROTOCOL   *Root;
    EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *SimpleFileSystem;

    Status = gBS->LocateProtocol(
                &gEfiSimpleFileSystemProtocolGuid, 
                NULL,
                (VOID **)&SimpleFileSystem);
                
    if (EFI_ERROR(Status)) {
            Print(L"Cannot find EFI_SIMPLE_FILE_SYSTEM_PROTOCOL \r\n");
            return Status;
    }

    Status = SimpleFileSystem->OpenVolume(SimpleFileSystem, &Root);
    if (EFI_ERROR(Status)) {
        Print(L"OpenVolume error \r\n");
        return Status;
    }
    Status = Root->Open(
                Root, 
                &FileHandle, 
                L"dumpvbt.bin",
                EFI_FILE_MODE_READ |
                EFI_FILE_MODE_WRITE | 
                EFI_FILE_MODE_CREATE, 
                0);
    if (EFI_ERROR(Status)){
        Print(L"Error Open NULL  [%r]\n",Status);
        return Status;
    }
    
    BufferSize = FileDataLength;
    Status = FileHandle->Write(FileHandle, &BufferSize, FileData);
    if (EFI_ERROR(Status)){
        Print(L"Error write [%r]\n",Status);
        return Status;
    }
    else Print(L"VBT has been saved to 'dumpvbt.bin' \n");
    
    FileHandle->Close(FileHandle);
    
    return Status;
}


/***
  Print a welcoming message.

  Establishes the main structure of the application.

  @retval  0         The application exited normally.
  @retval  Other     An error occurred.
***/
INTN
EFIAPI
ShellAppMain (
  IN UINTN Argc,
  IN CHAR16 **Argv
  )
{
        PLATFORM_GOP_POLICY_PROTOCOL    *mPlatformGopPolicyProtocl;
        EFI_STATUS              Status;
        EFI_PHYSICAL_ADDRESS    VbtAddress;
        UINT32                  VbtSize;
        
        Print(L"*************************************************\n");
        Print(L"* VBT dump tool By Platform GOP Policy Protocol *\n");
        Print(L"*                                 May 4th 2019  *\n");
        Print(L"*                      Powered by www.lab-z.com *\n");
        Print(L"*************************************************\n");
        
        //
        // Locate the Cpu Arch Protocol.
        //
        Status = gBS->LocateProtocol(
                        &gPlatformGOPPolicyGuid, 
                        NULL, 
                        &mPlatformGopPolicyProtocl);
        if (EFI_ERROR (Status)) {
                Print(L"Can't find EFI_PLATFORM_GOP_POLICY_PROTOCOL_\n");
                return Status;
        }        
        
        mPlatformGopPolicyProtocl->GetVbtData(&VbtAddress,&VbtSize);
        SaveToFile((UINT8 *)VbtAddress,VbtSize);
        
        return(0);
}