/** @file
  This file declares the Variable Storage Protocol

  The Variable Storage Protocol is used to acquire the variable storage
  instance ID (GUID) for a particular variable name and vendor GUID. This ID
  is used to find the appropriate variable storage Protocol.

 @copyright
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  This file contains an 'Intel Peripheral Driver' and is uniquely identified as
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  be modified by the user, subject to additional terms of the license agreement.

@par Specification Reference:
**/
#ifndef _VARIABLE_STORAGE_SELECTOR_PROTOCOL_H_
#define _VARIABLE_STORAGE_SELECTOR_PROTOCOL_H_

extern EFI_GUID gEdkiiVariableStorageSelectorProtocolGuid;
extern EFI_GUID gEdkiiSmmVariableStorageSelectorProtocolGuid;

///
/// Revision
///
#define VARIABLE_STORAGE_PROTOCOL_REVISION  1

typedef struct _EDKII_VARIABLE_STORAGE_SELECTOR_PROTOCOL  EDKII_VARIABLE_STORAGE_SELECTOR_PROTOCOL;

/**
  Gets the ID (GUID) for the variable storage instance that is used to store a given variable.

  @param[in]  VariableName       A pointer to a null-terminated string that is
                                 the variable's name.
  @param[in]  VariableGuid       A pointer to an EFI_GUID that is the variable's
                                 GUID. The combination of VariableGuid and
                                 VariableName must be unique.
  @param[out] VariableStorageId  The ID for the variable storage instance that
                                 stores a given variable

  @retval     EFI_SUCCESS        Variable storage instance ID that was retrieved
**/
typedef
EFI_STATUS
(EFIAPI *EDKII_VARIABLE_STORAGE_SELECTOR_GET_ID)(
  IN  CONST  CHAR16       *VariableName,
  IN  CONST  EFI_GUID     *VendorGuid,
  OUT        EFI_GUID     *VariableStorageId
  );

///
/// Variable Storage Selector Protocol
///
struct _EDKII_VARIABLE_STORAGE_SELECTOR_PROTOCOL {
  EDKII_VARIABLE_STORAGE_SELECTOR_GET_ID    GetId;      ///< Retrieves an instance-specific variable storage ID
};

#endif
