/** @file
  Acpi Table Builder.

  Copyright (c) 2017 - 2019, ARM Limited. All rights reserved.

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/AcpiSystemDescriptionTable.h>
#include <Protocol/AcpiTable.h>
#include <Library/BaseMemoryLib.h>

// Module specific include files.
#include <AcpiTableGenerator.h>
#include <ConfigurationManagerObject.h>
#include <ConfigurationManagerHelper.h>
#include <DeviceTreeTableGenerator.h>
#include <Library/TableHelperLib.h>
#include <Library/MetadataHandlerLib.h>
#include <Protocol/ConfigurationManagerProtocol.h>
#include <Protocol/DynamicTableFactoryProtocol.h>
#include "DynamicTableManagerDxe.h"

///
/// We require the FADT, MADT, GTDT and the DSDT tables to boot.
/// This list also include optional ACPI tables: DBG2, SPCR.
///
STATIC ACPI_TABLE_PRESENCE_INFO  *mAcpiVerifyTables;
STATIC UINT32                    mAcpiVerifyTablesCount;
STATIC INT32                     mAcpiVerifyTablesFadtIndex;

/** This macro expands to a function that retrieves the ACPI Table
    List from the Configuration Manager.
*/
GET_OBJECT_LIST (
  EObjNameSpaceStandard,
  EStdObjAcpiTableList,
  CM_STD_OBJ_ACPI_TABLE_INFO
  )

/** A helper function to build and install a single ACPI table.

  This is a helper function that invokes the Table generator interface
  for building an ACPI table. It uses the AcpiTableProtocol to install the
  table, then frees the resources allocated for generating it.

  @param [in]  TableFactoryProtocol Pointer to the Table Factory Protocol
                                    interface.
  @param [in]  CfgMgrProtocol       Pointer to the Configuration Manager
                                    Protocol Interface.
  @param [in]  Generator            Pointer to the AcpiTable generator.
  @param [in]  AcpiTableProtocol    Pointer to the AcpiTable protocol.
  @param [in]  AcpiTableInfo        Pointer to the ACPI table Info.

  @retval EFI_SUCCESS           Success.
  @retval EFI_INVALID_PARAMETER A parameter is invalid.
  @retval EFI_NOT_FOUND         Required object is not found.
  @retval EFI_BAD_BUFFER_SIZE   Size returned by the Configuration Manager
                                is less than the Object size for the
                                requested object.
**/
STATIC
EFI_STATUS
EFIAPI
BuildAndInstallSingleAcpiTable (
  IN CONST EDKII_DYNAMIC_TABLE_FACTORY_PROTOCOL  *CONST  TableFactoryProtocol,
  IN CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  *CONST  CfgMgrProtocol,
  IN CONST ACPI_TABLE_GENERATOR                  *CONST  Generator,
  IN       EFI_ACPI_TABLE_PROTOCOL                       *AcpiTableProtocol,
  IN CONST CM_STD_OBJ_ACPI_TABLE_INFO            *CONST  AcpiTableInfo
  )
{
  EFI_STATUS                   Status;
  EFI_STATUS                   Status1;
  EFI_ACPI_DESCRIPTION_HEADER  *AcpiTable;
  UINTN                        TableHandle;

  AcpiTable = NULL;
  Status    = Generator->BuildAcpiTable (
                           Generator,
                           AcpiTableInfo,
                           CfgMgrProtocol,
                           &AcpiTable
                           );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to Build Table." \
      " TableGeneratorId = 0x%x. Status = %r\n",
      AcpiTableInfo->TableGeneratorId,
      Status
      ));
    // Free any allocated resources.
    goto exit_handler;
  }

  if (AcpiTable == NULL) {
    Status = EFI_NOT_FOUND;
    goto exit_handler;
  }

  // Dump ACPI Table Header
  DUMP_ACPI_TABLE_HEADER (AcpiTable);

  // Install ACPI table
  Status = AcpiTableProtocol->InstallAcpiTable (
                                AcpiTableProtocol,
                                AcpiTable,
                                AcpiTable->Length,
                                &TableHandle
                                );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to Install ACPI Table. Status = %r\n",
      Status
      ));
    // Free any allocated resources.
    goto exit_handler;
  }

  DEBUG ((
    DEBUG_INFO,
    "INFO: ACPI Table installed. Status = %r\n",
    Status
    ));

exit_handler:
  // Free any resources allocated for generating the tables.
  if (Generator->FreeTableResources != NULL) {
    Status1 = Generator->FreeTableResources (
                           Generator,
                           AcpiTableInfo,
                           CfgMgrProtocol,
                           &AcpiTable
                           );
    if (EFI_ERROR (Status1)) {
      DEBUG ((
        DEBUG_ERROR,
        "ERROR: Failed to Free Table Resources." \
        "TableGeneratorId = 0x%x. Status = %r\n",
        AcpiTableInfo->TableGeneratorId,
        Status1
        ));
    }

    // Return the first error status in case of failure
    if (!EFI_ERROR (Status)) {
      Status = Status1;
    }
  }

  return Status;
}

/** A helper function to build and install multiple ACPI tables.

  This is a helper function that invokes the Table generator interface
  for building an ACPI table. It uses the AcpiTableProtocol to install the
  table, then frees the resources allocated for generating it.

  @param [in]  TableFactoryProtocol Pointer to the Table Factory Protocol
                                    interface.
  @param [in]  CfgMgrProtocol       Pointer to the Configuration Manager
                                    Protocol Interface.
  @param [in]  Generator            Pointer to the AcpiTable generator.
  @param [in]  AcpiTableProtocol    Pointer to the AcpiTable protocol.
  @param [in]  AcpiTableInfo        Pointer to the ACPI table Info.

  @retval EFI_SUCCESS           Success.
  @retval EFI_INVALID_PARAMETER A parameter is invalid.
  @retval EFI_NOT_FOUND         Required object is not found.
  @retval EFI_BAD_BUFFER_SIZE   Size returned by the Configuration Manager
                                is less than the Object size for the
                                requested object.
**/
STATIC
EFI_STATUS
EFIAPI
BuildAndInstallMultipleAcpiTable (
  IN CONST EDKII_DYNAMIC_TABLE_FACTORY_PROTOCOL  *CONST  TableFactoryProtocol,
  IN CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  *CONST  CfgMgrProtocol,
  IN CONST ACPI_TABLE_GENERATOR                  *CONST  Generator,
  IN       EFI_ACPI_TABLE_PROTOCOL                       *AcpiTableProtocol,
  IN CONST CM_STD_OBJ_ACPI_TABLE_INFO            *CONST  AcpiTableInfo
  )
{
  EFI_STATUS                   Status;
  EFI_STATUS                   Status1;
  EFI_ACPI_DESCRIPTION_HEADER  **AcpiTable;
  UINTN                        TableCount;
  UINTN                        TableHandle;
  UINTN                        Index;

  AcpiTable  = NULL;
  TableCount = 0;
  Status     = Generator->BuildAcpiTableEx (
                            Generator,
                            AcpiTableInfo,
                            CfgMgrProtocol,
                            &AcpiTable,
                            &TableCount
                            );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to Build Table." \
      " TableGeneratorId = 0x%x. Status = %r\n",
      AcpiTableInfo->TableGeneratorId,
      Status
      ));
    // Free any allocated resources.
    goto exit_handler;
  }

  if ((AcpiTable == NULL) || (TableCount == 0)) {
    Status = EFI_NOT_FOUND;
    goto exit_handler;
  }

  for (Index = 0; Index < TableCount; Index++) {
    // Dump ACPI Table Header
    DUMP_ACPI_TABLE_HEADER (AcpiTable[Index]);
    // Install ACPI table
    Status = AcpiTableProtocol->InstallAcpiTable (
                                  AcpiTableProtocol,
                                  AcpiTable[Index],
                                  AcpiTable[Index]->Length,
                                  &TableHandle
                                  );
    if (EFI_ERROR (Status)) {
      DEBUG ((
        DEBUG_ERROR,
        "ERROR: Failed to Install ACPI Table. Status = %r\n",
        Status
        ));
      // Free any allocated resources.
      goto exit_handler;
    }

    DEBUG ((
      DEBUG_INFO,
      "INFO: ACPI Table installed. Status = %r\n",
      Status
      ));
  }

exit_handler:
  // Free any resources allocated for generating the tables.
  if (Generator->FreeTableResourcesEx != NULL) {
    Status1 = Generator->FreeTableResourcesEx (
                           Generator,
                           AcpiTableInfo,
                           CfgMgrProtocol,
                           &AcpiTable,
                           TableCount
                           );
    if (EFI_ERROR (Status1)) {
      DEBUG ((
        DEBUG_ERROR,
        "ERROR: Failed to Free Table Resources." \
        "TableGeneratorId = 0x%x. Status = %r\n",
        AcpiTableInfo->TableGeneratorId,
        Status1
        ));
    }

    // Return the first error status in case of failure
    if (!EFI_ERROR (Status)) {
      Status = Status1;
    }
  }

  return Status;
}

/** A helper function to invoke a Table generator

  This is a helper function that invokes the Table generator interface
  for building an ACPI table. It uses the AcpiTableProtocol to install the
  table, then frees the resources allocated for generating it.

  @param [in]  TableFactoryProtocol Pointer to the Table Factory Protocol
                                    interface.
  @param [in]  CfgMgrProtocol       Pointer to the Configuration Manager
                                    Protocol Interface.
  @param [in]  AcpiTableProtocol    Pointer to the AcpiTable protocol.
  @param [in]  AcpiTableInfo        Pointer to the ACPI table Info.

  @retval EFI_SUCCESS           Success.
  @retval EFI_INVALID_PARAMETER A parameter is invalid.
  @retval EFI_NOT_FOUND         Required object is not found.
  @retval EFI_BAD_BUFFER_SIZE   Size returned by the Configuration Manager
                                is less than the Object size for the
                                requested object.
**/
STATIC
EFI_STATUS
EFIAPI
BuildAndInstallAcpiTable (
  IN CONST EDKII_DYNAMIC_TABLE_FACTORY_PROTOCOL  *CONST  TableFactoryProtocol,
  IN CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  *CONST  CfgMgrProtocol,
  IN       EFI_ACPI_TABLE_PROTOCOL                       *AcpiTableProtocol,
  IN CONST CM_STD_OBJ_ACPI_TABLE_INFO            *CONST  AcpiTableInfo
  )
{
  EFI_STATUS                  Status;
  CONST ACPI_TABLE_GENERATOR  *Generator;

  ASSERT (TableFactoryProtocol != NULL);
  ASSERT (CfgMgrProtocol != NULL);
  ASSERT (AcpiTableProtocol != NULL);
  ASSERT (AcpiTableInfo != NULL);

  DEBUG ((
    DEBUG_INFO,
    "INFO: EStdObjAcpiTableList: Address = 0x%p," \
    " TableGeneratorId = 0x%x\n",
    AcpiTableInfo,
    AcpiTableInfo->TableGeneratorId
    ));

  Generator = NULL;
  Status    = TableFactoryProtocol->GetAcpiTableGenerator (
                                      TableFactoryProtocol,
                                      AcpiTableInfo->TableGeneratorId,
                                      &Generator
                                      );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Table Generator not found." \
      " TableGeneratorId = 0x%x. Status = %r\n",
      AcpiTableInfo->TableGeneratorId,
      Status
      ));
    return Status;
  }

  if (Generator == NULL) {
    return EFI_NOT_FOUND;
  }

  DEBUG ((
    DEBUG_INFO,
    "INFO: Generator found : %s\n",
    Generator->Description
    ));

  if (Generator->BuildAcpiTableEx != NULL) {
    Status = BuildAndInstallMultipleAcpiTable (
               TableFactoryProtocol,
               CfgMgrProtocol,
               Generator,
               AcpiTableProtocol,
               AcpiTableInfo
               );
    if (EFI_ERROR (Status)) {
      DEBUG ((
        DEBUG_ERROR,
        "ERROR: Failed to find build and install ACPI Table." \
        " Status = %r\n",
        Status
        ));
    }
  } else if (Generator->BuildAcpiTable != NULL) {
    Status = BuildAndInstallSingleAcpiTable (
               TableFactoryProtocol,
               CfgMgrProtocol,
               Generator,
               AcpiTableProtocol,
               AcpiTableInfo
               );
    if (EFI_ERROR (Status)) {
      DEBUG ((
        DEBUG_ERROR,
        "ERROR: Failed to find build and install ACPI Table." \
        " Status = %r\n",
        Status
        ));
    }
  } else {
    Status = EFI_INVALID_PARAMETER;
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Table Generator does not implement the" \
      " ACPI_TABLE_GENERATOR_BUILD_TABLE interface." \
      " TableGeneratorId = 0x%x. Status = %r\n",
      AcpiTableInfo->TableGeneratorId,
      Status
      ));
  }

  return Status;
}

/** The function checks if the Configuration Manager has provided the
    mandatory ACPI tables for installation.

  @param [in]  AcpiTableInfo      Pointer to the ACPI Table Info list.
  @param [in]  AcpiTableCount     Count of ACPI Table Info.

  @retval EFI_SUCCESS           Success.
  @retval EFI_NOT_FOUND         If mandatory table is not found.
  @retval EFI_ALREADY_STARTED   If mandatory table found in AcpiTableInfo is already installed.
**/
STATIC
EFI_STATUS
EFIAPI
VerifyMandatoryTablesArePresent (
  IN CONST CM_STD_OBJ_ACPI_TABLE_INFO  *CONST  AcpiTableInfo,
  IN       UINT32                              AcpiTableCount
  )
{
  EFI_STATUS                   Status;
  UINTN                        Handle;
  UINTN                        Index;
  UINTN                        InstalledTableIndex;
  EFI_ACPI_DESCRIPTION_HEADER  *DescHeader;
  EFI_ACPI_TABLE_VERSION       Version;
  EFI_ACPI_SDT_PROTOCOL        *AcpiSdt;

  ASSERT (AcpiTableInfo != NULL);

  Status = EFI_SUCCESS;

  // Check against the statically initialized ACPI tables to see if they are in ACPI info list
  while (AcpiTableCount-- != 0) {
    for (Index = 0; Index < mAcpiVerifyTablesCount; Index++) {
      if (AcpiTableInfo[AcpiTableCount].AcpiTableSignature == mAcpiVerifyTables[Index].AcpiTableSignature) {
        mAcpiVerifyTables[Index].Presence |= ACPI_TABLE_PRESENT_INFO_LIST;
        // Found this table, skip the rest.
        break;
      }
    }
  }

  // They also might be published already, so we can search from there
  if (FeaturePcdGet (PcdInstallAcpiSdtProtocol)) {
    AcpiSdt = NULL;
    Status  = gBS->LocateProtocol (&gEfiAcpiSdtProtocolGuid, NULL, (VOID **)&AcpiSdt);

    if (EFI_ERROR (Status) || (AcpiSdt == NULL)) {
      DEBUG ((DEBUG_ERROR, "ERROR: Failed to locate ACPI SDT protocol (0x%p) - %r\n", AcpiSdt, Status));
      return Status;
    }

    for (Index = 0; Index < mAcpiVerifyTablesCount; Index++) {
      Handle              = 0;
      InstalledTableIndex = 0;
      do {
        Status = AcpiSdt->GetAcpiTable (InstalledTableIndex, (EFI_ACPI_SDT_HEADER **)&DescHeader, &Version, &Handle);
        if (EFI_ERROR (Status)) {
          break;
        }

        InstalledTableIndex++;
      } while (DescHeader->Signature != mAcpiVerifyTables[Index].AcpiTableSignature);

      if (!EFI_ERROR (Status)) {
        mAcpiVerifyTables[Index].Presence |= ACPI_TABLE_PRESENT_INSTALLED;
      }
    }
  }

  // Reset the return Status value to EFI_SUCCESS. We do not fully care if the table look up has failed.
  Status = EFI_SUCCESS;
  for (Index = 0; Index < mAcpiVerifyTablesCount; Index++) {
    if (mAcpiVerifyTables[Index].Presence == 0) {
      if (mAcpiVerifyTables[Index].IsMandatory) {
        DEBUG ((DEBUG_ERROR, "ERROR: %a Table not found.\n", mAcpiVerifyTables[Index].AcpiTableName));
        Status = EFI_NOT_FOUND;
      } else {
        DEBUG ((DEBUG_WARN, "WARNING: %a Table not found.\n", mAcpiVerifyTables[Index].AcpiTableName));
      }
    } else if (mAcpiVerifyTables[Index].Presence ==
               (ACPI_TABLE_PRESENT_INFO_LIST | ACPI_TABLE_PRESENT_INSTALLED))
    {
      DEBUG ((DEBUG_ERROR, "ERROR: %a Table found while already published.\n", mAcpiVerifyTables[Index].AcpiTableName));
      Status = EFI_ALREADY_STARTED;
    }
  }

  return Status;
}

/** Generate and install ACPI tables.

  The function gathers the information necessary for installing the
  ACPI tables from the Configuration Manager, invokes the generators
  and installs them (via BuildAndInstallAcpiTable).

  @param [in]  TableFactoryProtocol Pointer to the Table Factory Protocol
                                    interface.
  @param [in]  CfgMgrProtocol       Pointer to the Configuration Manager
                                    Protocol Interface.

  @retval EFI_SUCCESS           Success.
  @retval EFI_NOT_FOUND         If a mandatory table or a generator is not found.
  @retval EFI_ALREADY_STARTED   If mandatory table found in AcpiTableInfo is already installed.
**/
STATIC
EFI_STATUS
EFIAPI
ProcessAcpiTables (
  IN CONST EDKII_DYNAMIC_TABLE_FACTORY_PROTOCOL  *CONST  TableFactoryProtocol,
  IN CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  *CONST  CfgMgrProtocol
  )
{
  EFI_STATUS                  Status;
  EFI_ACPI_TABLE_PROTOCOL     *AcpiTableProtocol;
  CM_STD_OBJ_ACPI_TABLE_INFO  *AcpiTableInfo;
  UINT32                      AcpiTableCount;
  UINT32                      Idx;

  ASSERT (TableFactoryProtocol != NULL);
  ASSERT (CfgMgrProtocol != NULL);

  // Find the AcpiTable protocol
  Status = gBS->LocateProtocol (
                  &gEfiAcpiTableProtocolGuid,
                  NULL,
                  (VOID **)&AcpiTableProtocol
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to find AcpiTable protocol. Status = %r\n",
      Status
      ));
    return Status;
  }

  Status = GetEStdObjAcpiTableList (
             CfgMgrProtocol,
             CM_NULL_TOKEN,
             &AcpiTableInfo,
             &AcpiTableCount
             );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to get ACPI Table List. Status = %r\n",
      Status
      ));
    return Status;
  }

  if (0 == AcpiTableCount) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: EStdObjAcpiTableList: AcpiTableCount = %d\n",
      AcpiTableCount
      ));
    return EFI_NOT_FOUND;
  }

  DEBUG ((
    DEBUG_INFO,
    "INFO: EStdObjAcpiTableList: AcpiTableCount = %d\n",
    AcpiTableCount
    ));

  // Check if mandatory ACPI tables are present.
  Status = VerifyMandatoryTablesArePresent (
             AcpiTableInfo,
             AcpiTableCount
             );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to verify mandatory ACPI Table(s) presence."
      " Status = %r\n",
      Status
      ));
    return Status;
  }

  // Add the FADT Table first.
  if ((mAcpiVerifyTablesFadtIndex >= 0) &&
      ((mAcpiVerifyTables[mAcpiVerifyTablesFadtIndex].Presence & ACPI_TABLE_PRESENT_INSTALLED) == 0))
  {
    // FADT is not yet installed
    for (Idx = 0; Idx < AcpiTableCount; Idx++) {
      if (CREATE_STD_ACPI_TABLE_GEN_ID (EStdAcpiTableIdFadt) ==
          AcpiTableInfo[Idx].TableGeneratorId)
      {
        Status = BuildAndInstallAcpiTable (
                   TableFactoryProtocol,
                   CfgMgrProtocol,
                   AcpiTableProtocol,
                   &AcpiTableInfo[Idx]
                   );
        if (EFI_ERROR (Status)) {
          DEBUG ((
            DEBUG_ERROR,
            "ERROR: Failed to find build and install ACPI FADT Table." \
            " Status = %r\n",
            Status
            ));
          return Status;
        }

        break;
      }
    } // for
  }

  // Add remaining ACPI Tables
  for (Idx = 0; Idx < AcpiTableCount; Idx++) {
    DEBUG ((
      DEBUG_INFO,
      "INFO: AcpiTableInfo[%d].TableGeneratorId = 0x%x\n",
      Idx,
      AcpiTableInfo[Idx].TableGeneratorId
      ));

    // Skip FADT Table since we have already added
    if (CREATE_STD_ACPI_TABLE_GEN_ID (EStdAcpiTableIdFadt) ==
        AcpiTableInfo[Idx].TableGeneratorId)
    {
      continue;
    }

    // Skip the Reserved table Generator ID for standard generators
    if ((IS_GENERATOR_NAMESPACE_STD (AcpiTableInfo[Idx].TableGeneratorId)) &&
        ((CREATE_STD_ACPI_TABLE_GEN_ID (EStdAcpiTableIdReserved)           >=
          AcpiTableInfo[Idx].TableGeneratorId)                           ||
         (CREATE_STD_ACPI_TABLE_GEN_ID (EStdAcpiTableIdMax)                <=
          AcpiTableInfo[Idx].TableGeneratorId)))
    {
      DEBUG ((
        DEBUG_WARN,
        "WARNING: Invalid ACPI Generator table ID = 0x%x, Skipping...\n",
        AcpiTableInfo[Idx].TableGeneratorId
        ));
      continue;
    }

    Status = BuildAndInstallAcpiTable (
               TableFactoryProtocol,
               CfgMgrProtocol,
               AcpiTableProtocol,
               &AcpiTableInfo[Idx]
               );
    if (EFI_ERROR (Status)) {
      DEBUG ((
        DEBUG_ERROR,
        "ERROR: Failed to find, build, and install ACPI Table." \
        " Status = %r\n",
        Status
        ));
      return Status;
    }
  } // for

  return Status;
}

/** ACPI table Protocol ready event handler.

  This event notification indicates that the ACPI protocol is ready.
  Therefore, dispatch the building of the ACPI tables.

  @param  [in]  Event     The Event that is signalled.
  @param  [in]  Context   The Context information.

  @retval None
**/
VOID
EFIAPI
AcpiTableProtocolReady (
  IN  EFI_EVENT  Event,
  IN  VOID       *Context
  )
{
  EFI_STATUS                             Status;
  EDKII_CONFIGURATION_MANAGER_PROTOCOL   *CfgMgrProtocol;
  CM_STD_OBJ_CONFIGURATION_MANAGER_INFO  *CfgMfrInfo;
  EDKII_DYNAMIC_TABLE_FACTORY_PROTOCOL   *TableFactoryProtocol;
  METADATA_ROOT_HANDLE                   Root;

  // Locate the Dynamic Table Factory
  Status = gBS->LocateProtocol (
                  &gEdkiiDynamicTableFactoryProtocolGuid,
                  NULL,
                  (VOID **)&TableFactoryProtocol
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to find Dynamic Table Factory protocol." \
      " Status = %r\n",
      Status
      ));
    return;
  }

  // Locate the Configuration Manager for the Platform
  Status = gBS->LocateProtocol (
                  &gEdkiiConfigurationManagerProtocolGuid,
                  NULL,
                  (VOID **)&CfgMgrProtocol
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to find Configuration Manager protocol. Status = %r\n",
      Status
      ));
    return;
  }

  Status = GetCgfMgrInfo (CfgMgrProtocol, &CfgMfrInfo);
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: Failed to get Configuration Manager info. Status = %r\n",
      Status
      ));
    return;
  }

  DEBUG ((
    DEBUG_INFO,
    "INFO: Configuration Manager Version = 0x%x, OemID = %c%c%c%c%c%c\n",
    CfgMfrInfo->Revision,
    CfgMfrInfo->OemId[0],
    CfgMfrInfo->OemId[1],
    CfgMfrInfo->OemId[2],
    CfgMfrInfo->OemId[3],
    CfgMfrInfo->OemId[4],
    CfgMfrInfo->OemId[5]
    ));

  Status = GetAcpiTablePresenceInfo (
             &mAcpiVerifyTables,
             &mAcpiVerifyTablesCount,
             &mAcpiVerifyTablesFadtIndex
             );
  if (EFI_ERROR (Status)) {
    ASSERT_EFI_ERROR (Status);
    return;
  }

  Status = ProcessAcpiTables (TableFactoryProtocol, CfgMgrProtocol);
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "ERROR: ACPI Table processing failure. Status = %r\n",
      Status
      ));
    ASSERT_EFI_ERROR (Status);
    return;
  }

  Root = TableFactoryProtocol->GetMetadataRoot ();

  // Validate the collected Metadata.
  Status = MetadataHandlerValidate (Root);
  if (EFI_ERROR (Status)) {
    ASSERT_EFI_ERROR (Status);
    return;
  }

  MetadataFreeHandle (Root);

  Status = gBS->CloseEvent (Event);
  ASSERT_EFI_ERROR (Status);
}