/** @file
  Platform Configuration Database (PCD) Protocol defined in PI 1.2 Vol3

  A platform database that contains a variety of current platform settings or
  directives that can be accessed by a driver or application.
  PI PCD protocol only provide the accessing interfaces for Dynamic-Ex type PCD.

  Callers to this protocol must be at a TPL_APPLICATION task priority level.
  This is the base PCD service API that provides an abstraction for accessing configuration content in
  the platform. It a seamless mechanism for extracting information regardless of where the
  information is stored (such as in Read-only data, or an EFI Variable).
  This protocol allows access to data through size-granular APIs and provides a mechanism for a
  firmware component to monitor specific settings and be alerted when a setting is changed.

  Copyright (c) 2009 - 2010, 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.

  @par Revision Reference:
  PI Version 1.2 Vol 3.
**/

#ifndef __PI_PCD_H__
#define __PI_PCD_H__

extern EFI_GUID gEfiPcdProtocolGuid;

#define EFI_PCD_PROTOCOL_GUID \
  { 0x13a3f0f6, 0x264a, 0x3ef0, { 0xf2, 0xe0, 0xde, 0xc5, 0x12, 0x34, 0x2f, 0x34 } }

#define EFI_PCD_INVALID_TOKEN_NUMBER ((UINTN) 0)

/**
  SetSku() sets the SKU Id to be used for subsequent calls to set or get PCD values. SetSku() is
  normally called only once by the system.
  For each item (token), the database can hold a single value that applies to all SKUs, or multiple
  values, where each value is associated with a specific SKU Id. Items with multiple, SKU-specific
  values are called SKU enabled.
  The SKU Id of zero is reserved as a default. The valid SkuId range is 1 to 255. For tokens that are
  not SKU enabled, the system ignores any set SKU Id and works with the single value for that token.
  For SKU-enabled tokens, the system will use the SKU Id set by the last call to SetSku(). If no SKU
  Id is set or the currently set SKU Id isn't valid for the specified token, the system uses the default
  SKU Id. If the system attempts to use the default SKU Id and no value has been set for that Id, the
  results are unpredictable.

  @param[in]  SkuId   The SKU value to set.
**/
typedef
VOID
(EFIAPI *EFI_PCD_PROTOCOL_SET_SKU)(
  IN UINTN SkuId
);

/**
  Retrieves an 8-bit value for a given PCD token.
  If the TokenNumber is invalid, the results are unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return 8-bit value for a given PCD token.
**/
typedef
UINT8
(EFIAPI *EFI_PCD_PROTOCOL_GET_8)(
  IN CONST EFI_GUID   *Guid,
  IN       UINTN      TokenNumber
);

/**
  Retrieves the current word-sized value for a PCD token number.
  If the TokenNumber is invalid, the results are unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return word-sized value for a given PCD token.
**/
typedef
UINT16
(EFIAPI *EFI_PCD_PROTOCOL_GET_16)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current 32-bit sized value for a PCD token number.
  If the TokenNumber is invalid, the results are unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return 32-bit value for a given PCD token.
**/
typedef
UINT32
(EFIAPI *EFI_PCD_PROTOCOL_GET_32)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the 64-bit sized value for a PCD token number.
  If the TokenNumber is invalid, the results are unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return 64-bit value for a given PCD token.

**/
typedef
UINT64
(EFIAPI *EFI_PCD_PROTOCOL_GET_64)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current pointer to the value for a PCD token number. Do not make any assumptions
  about the alignment of the pointer that is returned by this function call. If the TokenNumber is
  invalid, the results are unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return pointer to a value for a given PCD token.
**/
typedef
VOID *
(EFIAPI *EFI_PCD_PROTOCOL_GET_POINTER)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current BOOLEAN-sized value for a PCD token number. If the TokenNumber is
  invalid, the results are unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return Boolean value for a given PCD token.
**/
typedef
BOOLEAN
(EFIAPI *EFI_PCD_PROTOCOL_GET_BOOLEAN)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current size of a particular PCD token. If the TokenNumber is invalid, the results are
  unpredictable.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.

  @return the size of the value for a given PCD token.
**/
typedef
UINTN
(EFIAPI *EFI_PCD_PROTOCOL_GET_SIZE)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Sets an 8-bit value for a given PCD token.

  When the PCD service sets a value, it will check to ensure that the size of the value being set is
  compatible with the Token's existing definition. If it is not, an error will be returned.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.
  @param[in]    Value       The value to set for the PCD token.

  @retval   EFI_SUCCESS             The PCD service has set the value requested
  @retval   EFI_INVALID_PARAMETER   The PCD service determined that the size of the data being set was
                                    incompatible with a call to this function. Use GetSizeEx() to
                                    retrieve the size of the target data.
  @retval   EFI_NOT_FOUND           The PCD service could not find the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_SET_8)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        UINT8     Value
);

/**
  Sets an 16-bit value for a given PCD token.

  When the PCD service sets a value, it will check to ensure that the size of the value being set is
  compatible with the Token's existing definition. If it is not, an error will be returned.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.
  @param[in]    Value       The value to set for the PCD token.

  @retval   EFI_SUCCESS             The PCD service has set the value requested
  @retval   EFI_INVALID_PARAMETER   The PCD service determined that the size of the data being set was
                                    incompatible with a call to this function. Use GetSizeEx() to
                                    retrieve the size of the target data.
  @retval   EFI_NOT_FOUND           The PCD service could not find the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_SET_16)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        UINT16    Value
);

/**
  Sets an 32-bit value for a given PCD token.

  When the PCD service sets a value, it will check to ensure that the size of the value being set is
  compatible with the Token's existing definition. If it is not, an error will be returned.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.
  @param[in]    Value       The value to set for the PCD token.

  @retval   EFI_SUCCESS             The PCD service has set the value requested
  @retval   EFI_INVALID_PARAMETER   The PCD service determined that the size of the data being set was
                                    incompatible with a call to this function. Use GetSizeEx() to
                                    retrieve the size of the target data.
  @retval   EFI_NOT_FOUND           The PCD service could not find the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_SET_32)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        UINT32    Value
);

/**
  Sets an 64-bit value for a given PCD token.

  When the PCD service sets a value, it will check to ensure that the size of the value being set is
  compatible with the Token's existing definition. If it is not, an error will be returned.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.
  @param[in]    Value       The value to set for the PCD token.

  @retval   EFI_SUCCESS             The PCD service has set the value requested
  @retval   EFI_INVALID_PARAMETER   The PCD service determined that the size of the data being set was
                                    incompatible with a call to this function. Use GetSizeEx() to
                                    retrieve the size of the target data.
  @retval   EFI_NOT_FOUND           The PCD service could not find the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_SET_64)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        UINT64    Value
);

/**
  Sets a value of a specified size for a given PCD token.

  When the PCD service sets a value, it will check to ensure that the size of the value being set is
  compatible with the Token's existing definition. If it is not, an error will be returned.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.
  @param[in]    SizeOfValue The length of the value being set for the PCD token. If too large of a length is
                            specified, upon return from this function the value of SizeOfValue will
                            reflect the maximum size for the PCD token.
  @param[in]    Buffer      A pointer to the buffer containing the value to set for the PCD token.

  @retval   EFI_SUCCESS             The PCD service has set the value requested
  @retval   EFI_INVALID_PARAMETER   The PCD service determined that the size of the data being set was
                                    incompatible with a call to this function. Use GetSizeEx() to
                                    retrieve the size of the target data.
  @retval   EFI_NOT_FOUND           The PCD service could not find the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_SET_POINTER)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN OUT    UINTN     *SizeOfValue,
  IN        VOID      *Buffer
);

/**
  Sets a Boolean value for a given PCD token.

  When the PCD service sets a value, it will check to ensure that the size of the value being set is
  compatible with the Token's existing definition. If it is not, an error will be returned.

  @param[in]    Guid        The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    TokenNumber The PCD token number.
  @param[in]    Value       The value to set for the PCD token.

  @retval   EFI_SUCCESS             The PCD service has set the value requested
  @retval   EFI_INVALID_PARAMETER   The PCD service determined that the size of the data being set was
                                    incompatible with a call to this function. Use GetSizeEx() to
                                    retrieve the size of the target data.
  @retval   EFI_NOT_FOUND           The PCD service could not find the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_SET_BOOLEAN)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        BOOLEAN   Value
);

typedef
VOID
(EFIAPI *EFI_PCD_PROTOCOL_CALLBACK)(
  IN     EFI_GUID *Guid           OPTIONAL,
  IN     UINTN    CallBackToken,
  IN OUT VOID     *TokenData,
  IN     UINTN    TokenDataSize
);

/**
  Specifies a function to be called anytime the value of a designated token is changed.

  @param[in]    Guid              The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    CallBackToken     The PCD token number to monitor.
  @param[in]    CallBackFunction  The function prototype called when the value associated with the CallBackToken is set.

  @retval EFI_SUCCESS     The PCD service has successfully established a call event for the CallBackToken requested.
  @retval EFI_NOT_FOUND   The PCD service could not find the referenced token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_CALLBACK_ON_SET)(
  IN CONST  EFI_GUID                  *Guid           OPTIONAL,
  IN        UINTN                     CallBackToken,
  IN        EFI_PCD_PROTOCOL_CALLBACK CallBackFunction
);

/**
  Cancels a callback function that was set through a previous call to the CallBackOnSet function.

  @param[in]    Guid              The 128-bit unique value that designates the namespace from which to extract the value.
  @param[in]    CallBackToken     The PCD token number to monitor.
  @param[in]    CallBackFunction  The function prototype called when the value associated with the CallBackToken is set.

  @retval EFI_SUCCESS     The PCD service has successfully established a call event for the CallBackToken requested.
  @retval EFI_NOT_FOUND   The PCD service could not find the referenced token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_CANCEL_CALLBACK)(
  IN CONST  EFI_GUID                  *Guid OPTIONAL,
  IN        UINTN                     CallBackToken,
  IN        EFI_PCD_PROTOCOL_CALLBACK CallBackFunction
);

/**
  Gets the next valid token number in a given namespace. This is useful since the PCD infrastructure
  contains a sparse list of token numbers, and one cannot a priori know what token numbers are valid
  in the database.

  @param[in]    Guid              The 128-bit unique value that designates the namespace from which to retrieve the next token.
  @param[in]    TokenNumber       A pointer to the PCD token number to use to find the subsequent token number. To
                                  retrieve the "first" token, have the pointer reference a TokenNumber value of 0.
  @retval EFI_SUCCESS           The PCD service has retrieved the value requested
  @retval EFI_NOT_FOUND         The PCD service could not find data from the requested token number.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_GET_NEXT_TOKEN)(
  IN CONST  EFI_GUID  *Guid, OPTIONAL
  IN        UINTN     *TokenNumber
);

/**
  Gets the next valid token namespace for a given namespace. This is useful to traverse the valid
  token namespaces on a platform.

  @param[in, out]   Guid    An indirect pointer to EFI_GUID. On input it designates a known token namespace
                            from which the search will start. On output, it designates the next valid token
                            namespace on the platform. If *Guid is NULL, then the GUID of the first token
                            space of the current platform is returned. If the search cannot locate the next valid
                            token namespace, an error is returned and the value of *Guid is undefined.

  @retval   EFI_SUCCESS   The PCD service retrieved the value requested.
  @retval   EFI_NOT_FOUND The PCD service could not find the next valid token namespace.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCD_PROTOCOL_GET_NEXT_TOKEN_SPACE)(
  IN OUT CONST EFI_GUID **Guid
);

typedef struct _EFI_PCD_PROTOCOL {
  EFI_PCD_PROTOCOL_SET_SKU              SetSku;
  EFI_PCD_PROTOCOL_GET_8                Get8;
  EFI_PCD_PROTOCOL_GET_16               Get16;
  EFI_PCD_PROTOCOL_GET_32               Get32;
  EFI_PCD_PROTOCOL_GET_64               Get64;
  EFI_PCD_PROTOCOL_GET_POINTER          GetPtr;
  EFI_PCD_PROTOCOL_GET_BOOLEAN          GetBool;
  EFI_PCD_PROTOCOL_GET_SIZE             GetSize;
  EFI_PCD_PROTOCOL_SET_8                Set8;
  EFI_PCD_PROTOCOL_SET_16               Set16;
  EFI_PCD_PROTOCOL_SET_32               Set32;
  EFI_PCD_PROTOCOL_SET_64               Set64;
  EFI_PCD_PROTOCOL_SET_POINTER          SetPtr;
  EFI_PCD_PROTOCOL_SET_BOOLEAN          SetBool;
  EFI_PCD_PROTOCOL_CALLBACK_ON_SET      CallbackOnSet;
  EFI_PCD_PROTOCOL_CANCEL_CALLBACK      CancelCallback;
  EFI_PCD_PROTOCOL_GET_NEXT_TOKEN       GetNextToken;
  EFI_PCD_PROTOCOL_GET_NEXT_TOKEN_SPACE GetNextTokenSpace;
} EFI_PCD_PROTOCOL;

#endif
