/** @file
  This code makes the BIOS Data structure available via standard ACPI mechanisms.

@copyright
  INTEL CONFIDENTIAL
  Copyright 1999 - 2016 Intel Corporation.

  The source code contained or described herein and all documents related to the
  source code ("Material") are owned by Intel Corporation or its suppliers or
  licensors. Title to the Material remains with Intel Corporation or its suppliers
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  confidential information of Intel Corporation and its suppliers and licensors,
  and is protected by worldwide copyright and trade secret laws and treaty
  provisions. No part of the Material may be used, copied, reproduced, modified,
  published, uploaded, posted, transmitted, distributed, or disclosed in any way
  without Intel's prior express written permission.

  No license under any patent, copyright, trade secret or other intellectual
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  otherwise. Any license under such intellectual property rights must be
  express and approved by Intel in writing.

  Unless otherwise agreed by Intel in writing, you may not remove or alter
  this notice or any other notice embedded in Materials by Intel or
  Intel's suppliers or licensors in any way.

  This file contains an 'Intel Peripheral Driver' and is uniquely identified as
  "Intel Reference Module" and is licensed for Intel CPUs and chipsets under
  the terms of your license agreement with Intel or your vendor. This file may
  be modified by the user, subject to additional terms of the license agreement.

@par Specification Reference:
**/
#include "BdatAccessHandler.h"

STATIC EFI_ACPI_TABLE_PROTOCOL  *AcpiTable;

/**
  Entry point of the Bdat Access Handler.

  @param[in] ImageHandle   EFI_HANDLE: A handle for the image that is initializing this driver
  @param[in] SystemTable   EFI_SYSTEM_TABLE: A pointer to the EFI system table

  @retval EFI_SUCCESS:              Driver initialized successfully
  @exception EFI_UNSUPPORTED:          A needed driver was not located
  @retval EFI_OUT_OF_RESOURCES:     Could not allocate needed resources
**/
EFI_STATUS
EFIAPI
BdatAccessHandler (
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
{
  EFI_STATUS                      Status;
  VOID                            *HobList;
  SA_POLICY_PROTOCOL              *SaPolicy;

  ///
  /// Check if the BDAT ACPI table support is enabled in Setup, if not then exit.
  /// Get the platform setup policy.
  ///
  Status = gBS->LocateProtocol (&gSaPolicyProtocolGuid, NULL, (VOID **) &SaPolicy);
  ASSERT_EFI_ERROR (Status);

  ///
  /// Get the start of the HOBs.
  ///
  Status = EfiGetSystemConfigurationTable (&gEfiHobListGuid, &HobList);
  ASSERT_EFI_ERROR (Status);
  if (EFI_ERROR (Status)) {
    return EFI_UNSUPPORTED;
  }
  ///
  /// Locate ACPI table protocol
  ///
  Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) &AcpiTable);
  ASSERT_EFI_ERROR (Status);
  ASSERT (AcpiTable != NULL);
  if ((AcpiTable == NULL) || EFI_ERROR (Status)) {
    return EFI_OUT_OF_RESOURCES;
  }
  CreateBdatTable (SaPolicy, HobList, AcpiTable);
  ///
  /// ASSERT_EFI_ERROR (Status);
  ///
  return Status;
}