/** @file
  ACPI Platform Driver

Copyright (c) 2017, 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 that 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 <Base.h>
#include <Uefi.h>
#include <IndustryStandard/Acpi.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/PciLib.h>
#include <Library/BoardAcpiTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/AslUpdateLib.h>

#include <Protocol/GlobalNvsArea.h>
#include <Protocol/FirmwareVolume2.h>
#include <Protocol/AcpiTable.h>

GLOBAL_REMOVE_IF_UNREFERENCED EFI_GLOBAL_NVS_AREA_PROTOCOL              mGlobalNvsArea;

/**
@brief
  Global NVS initialize.
  
  @param[in] GlobalNvs         - Pointer of Global NVS area

  @retval EFI_SUCCESS          - Allocate Global NVS completed.
  @retval EFI_OUT_OF_RESOURCES - Failed to allocate required page for GNVS.
**/
EFI_STATUS
EFIAPI
AcpiGnvsInit (
  IN OUT VOID                   **GlobalNvs
  );

VOID
UpdateDsdt (
  IN VOID   *Table
  );

//
// Function implementations
//

/**
  Locate the first instance of a protocol.  If the protocol requested is an
  FV protocol, then it will return the first FV that contains the ACPI table
  storage file.

  @param[in] Protocol           The protocol to find.
  @param[in] Instance           Return pointer to the first instance of the protocol.
  @param[in] Type               TRUE if the desired protocol is a FV protocol.

  @retval EFI_SUCCESS           The function completed successfully.
  @retval EFI_NOT_FOUND         The protocol could not be located.
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources to find the protocol.
**/
EFI_STATUS
LocateSupportProtocol (
  IN     EFI_GUID                      *Protocol,
  IN     EFI_GUID                      *gEfiAcpiMultiTableStorageGuid,
     OUT VOID                          **Instance,
  IN     BOOLEAN                       Type
  )
{
  EFI_STATUS              Status;
  EFI_HANDLE              *HandleBuffer;
  UINTN                   NumberOfHandles;
  EFI_FV_FILETYPE         FileType;
  UINT32                  FvStatus;
  EFI_FV_FILE_ATTRIBUTES  Attributes;
  UINTN                   Size;
  UINTN                   Index;

  //
  // Locate protocol.
  //
  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  Protocol,
                  NULL,
                  &NumberOfHandles,
                  &HandleBuffer
                  );
  if (EFI_ERROR (Status)) {
    //
    // Defined errors at this time are not found and out of resources.
    //
    return Status;
  }

  //
  // Looking for FV with ACPI storage file
  //
  for (Index = 0; Index < NumberOfHandles; Index++) {

    //
    // Get the protocol on this handle
    // This should not fail because of LocateHandleBuffer
    //
    Status = gBS->HandleProtocol (
                    HandleBuffer[Index],
                    Protocol,
                    Instance
                    );
    ASSERT_EFI_ERROR (Status);

    if (!Type) {

      //
      // Not looking for the FV protocol, so find the first instance of the
      // protocol.  There should not be any errors because our handle buffer
      // should always contain at least one or LocateHandleBuffer would have
      // returned not found.
      //
      break;
    }

    //
    // See if it has the ACPI storage file
    //
    Size      = 0;
    FvStatus  = 0;
    Status = ((EFI_FIRMWARE_VOLUME2_PROTOCOL *) (*Instance))->ReadFile (
                                                              *Instance,
                                                              gEfiAcpiMultiTableStorageGuid,
                                                              NULL,
                                                              &Size,
                                                              &FileType,
                                                              &Attributes,
                                                              &FvStatus
                                                              );

    //
    // If we found it, then we are done
    //
    if (Status == EFI_SUCCESS) {
      break;
    }
  }

  //
  // Our exit status is determined by the success of the previous operations
  // If the protocol was found, Instance already points to it.
  //
  //
  // Free any allocated buffers
  //
  FreePool (HandleBuffer);

  return Status;
}

EFI_STATUS
PublishAcpiTablesFromFv (
  IN EFI_GUID *gEfiAcpiMultiTableStorageGuid
  )
{
  EFI_STATUS                    Status;
  EFI_FIRMWARE_VOLUME2_PROTOCOL *FwVol;
  EFI_ACPI_COMMON_HEADER        *CurrentTable;
  UINT32                        FvStatus;
  UINTN                         Size;
  EFI_ACPI_TABLE_VERSION        Version;
  UINTN                         TableHandle;
  INTN                          Instance;
  EFI_ACPI_TABLE_PROTOCOL       *AcpiTable;

  Instance      = 0;
  TableHandle   = 0;
  CurrentTable  = NULL;
  FwVol         = NULL;

  //
  // Find the AcpiSupport protocol
  //
  Status = LocateSupportProtocol (
            &gEfiAcpiTableProtocolGuid,
            gEfiAcpiMultiTableStorageGuid,
            (VOID **) &AcpiTable,
            FALSE
            );
  ASSERT_EFI_ERROR (Status);

  //
  // Locate the firmware volume protocol
  //
  Status = LocateSupportProtocol (
            &gEfiFirmwareVolume2ProtocolGuid,
            gEfiAcpiMultiTableStorageGuid,
            (VOID **) &FwVol,
            TRUE
            );

  //
  // Read tables from the storage file.
  //

  while (Status == EFI_SUCCESS) {
    Status = FwVol->ReadSection (
                      FwVol,
                      gEfiAcpiMultiTableStorageGuid,
                      EFI_SECTION_RAW,
                      Instance,
                      (VOID **) &CurrentTable,
                      &Size,
                      &FvStatus
                      );

    if (!EFI_ERROR (Status)) {

      //
      // Perform any table specific updates.
      //
      if (CurrentTable->Signature == EFI_ACPI_2_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE) {
        UpdateDsdt (CurrentTable);
      }
      BoardUpdateAcpiTable (CurrentTable, &Version);

      //
      // Add the table
      //
      TableHandle = 0;

      if (Version != EFI_ACPI_TABLE_VERSION_NONE) {
        Status = AcpiTable->InstallAcpiTable (
                              AcpiTable,
                              CurrentTable,
                              CurrentTable->Length,
                              &TableHandle
                              );
      }

      ASSERT_EFI_ERROR (Status);

      //
      // Increment the instance
      //
      Instance++;
      CurrentTable = NULL;
    }
  }

  //
  // Finished
  //
  return EFI_SUCCESS;
}

/**
  ACPI Platform driver installation function.

  @param[in] ImageHandle     Handle for this drivers loaded image protocol.
  @param[in] SystemTable     EFI system table.

  @retval EFI_SUCCESS        The driver installed without error.
  @retval EFI_ABORTED        The driver encountered an error and could not complete installation of
                             the ACPI tables.

**/
EFI_STATUS
EFIAPI
InstallAcpiBoard (
  IN EFI_HANDLE         ImageHandle,
  IN EFI_SYSTEM_TABLE   *SystemTable
  )
{
  EFI_STATUS   Status;
  EFI_HANDLE   Handle;

  AcpiGnvsInit((VOID **) &mGlobalNvsArea.Area);

  //
  // This PCD set must be done before PublishAcpiTablesFromFv.
  // The PCD data will be used there.
  //
  PcdSet64S (PcdAcpiGnvsAddress, (UINT64)(UINTN)mGlobalNvsArea.Area);

  //
  // Platform ACPI Tables
  //
  PublishAcpiTablesFromFv (&gEfiCallerIdGuid);

  //
  // This protocol publish must be done after PublishAcpiTablesFromFv.
  // The NVS data is be updated there.
  //
  Handle = NULL;
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Handle,
                  &gEfiGlobalNvsAreaProtocolGuid,
                  &mGlobalNvsArea,
                  NULL
                  );
  ASSERT_EFI_ERROR (Status);
  
  return EFI_SUCCESS;
}