uefi/linaro-edk2/MdePkg/Include/Protocol/AcpiTable.h

/** @file
  The file provides the protocol to install or remove an ACPI
  table from a platform. 
  
  Copyright (c) 2006 - 2014, 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.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.             

**/

#ifndef __ACPI_TABLE_H___
#define __ACPI_TABLE_H___

#define EFI_ACPI_TABLE_PROTOCOL_GUID \
  { 0xffe06bdd, 0x6107, 0x46a6, { 0x7b, 0xb2, 0x5a, 0x9c, 0x7e, 0xc5, 0x27, 0x5c }}


typedef struct _EFI_ACPI_TABLE_PROTOCOL EFI_ACPI_TABLE_PROTOCOL;

/**

  The InstallAcpiTable() function allows a caller to install an   
  ACPI table. When successful, the table will be linked by the   
  RSDT/XSDT. AcpiTableBuffer specifies the table to be installed.   
  InstallAcpiTable() will make a copy of the table and insert the   
  copy into the RSDT/XSDT. InstallAcpiTable() must insert the new   
  table at the end of the RSDT/XSDT. To prevent namespace   
  collision, ACPI tables may be created using UEFI ACPI table   
  format. If this protocol is used to install a table with a
  signature already present in the system, the new table will not
  replace the existing table. It is a platform implementation
  decision to add a new table with a signature matching an
  existing table or disallow duplicate table signatures and
  return EFI_ACCESS_DENIED. On successful output, TableKey is   
  initialized with a unique key. Its value may be used in a   
  subsequent call to UninstallAcpiTable to remove an ACPI table.   
  If an EFI application is running at the time of this call, the   
  relevant EFI_CONFIGURATION_TABLE pointer to the RSDT is no   
  longer considered valid.   


  @param This                 A pointer to a EFI_ACPI_TABLE_PROTOCOL.

  @param AcpiTableBuffer      A pointer to a buffer containing the
                              ACPI table to be installed.

  @param AcpiTableBufferSize  Specifies the size, in bytes, of
                              the AcpiTableBuffer buffer.


  @param TableKey             Returns a key to refer to the ACPI table.
  
  @retval EFI_SUCCESS           The table was successfully inserted
  
  @retval EFI_INVALID_PARAMETER Either AcpiTableBuffer is NULL,
                                TableKey is NULL, or
                                AcpiTableBufferSize and the size
                                field embedded in the ACPI table
                                pointed to by AcpiTableBuffer
                                are not in sync.
  
  @retval EFI_OUT_OF_RESOURCES  Insufficient resources exist to
                                complete the request.
  @retval EFI_ACCESS_DENIED     The table signature matches a table already
                                present in the system and platform policy
                                does not allow duplicate tables of this type.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ACPI_TABLE_INSTALL_ACPI_TABLE)(
  IN   EFI_ACPI_TABLE_PROTOCOL       *This,
  IN   VOID                          *AcpiTableBuffer,
  IN   UINTN                         AcpiTableBufferSize,
  OUT  UINTN                         *TableKey
);


/**
  
  The UninstallAcpiTable() function allows a caller to remove an
  ACPI table. The routine will remove its reference from the
  RSDT/XSDT. A table is referenced by the TableKey parameter
  returned from a prior call to InstallAcpiTable(). If an EFI
  application is running at the time of this call, the relevant
  EFI_CONFIGURATION_TABLE pointer to the RSDT is no longer
  considered valid.

  @param This                   A pointer to a EFI_ACPI_TABLE_PROTOCOL.

  @param TableKey               Specifies the table to uninstall. The key was
                                returned from InstallAcpiTable().

  @retval EFI_SUCCESS           The table was successfully inserted

  @retval EFI_NOT_FOUND         TableKey does not refer to a valid key
                                for a table entry.

  @retval EFI_OUT_OF_RESOURCES  Insufficient resources exist to
                                complete the request.
  
**/
typedef
EFI_STATUS
(EFIAPI *EFI_ACPI_TABLE_UNINSTALL_ACPI_TABLE)(
  IN  EFI_ACPI_TABLE_PROTOCOL       *This,
  IN  UINTN                         TableKey
);

///
/// The EFI_ACPI_TABLE_PROTOCOL provides the ability for a component
/// to install and uninstall ACPI tables from a platform.
///
struct _EFI_ACPI_TABLE_PROTOCOL {
  EFI_ACPI_TABLE_INSTALL_ACPI_TABLE   InstallAcpiTable;
  EFI_ACPI_TABLE_UNINSTALL_ACPI_TABLE UninstallAcpiTable;
};

extern EFI_GUID gEfiAcpiTableProtocolGuid;

#endif