audk/MdePkg/Include/Ppi/PiPcd.h

/** @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, Intel Corporation                                                         
  All rights reserved. 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_PPI_H__
#define __PI_PCD_PPI_H__

extern EFI_GUID gEfiPeiPcdPpiGuid;

#define EFI_PEI_PCD_PPI_GUID \
  { 0x1f34d25, 0x4de2, 0x23ad, { 0x3f, 0xf3, 0x36, 0x35, 0x3f, 0xf3, 0x23, 0xf1 } }

#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_PEI_PCD_PPI_SET_SKU)(
  IN UINTN SkuId
);

/**
  Retrieves the current byte-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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number.
  
  @return 8-bit value for a given PCD token.
**/
typedef
UINT8
(EFIAPI *EFI_PEI_PCD_PPI_GET_EX_8)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current byte-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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number.
  
  @return 16-bit value for a given PCD token.
**/
typedef
UINT16
(EFIAPI *EFI_PEI_PCD_PPI_GET_EX_16)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current 32-bit 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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number.
  
  @return 32-bit value for a given PCD token.  
**/
typedef
UINT32
(EFIAPI *EFI_PEI_PCD_PPI_GET_EX_32)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber
);

/**
  Retrieves the current pointer to the value for a PCD token number. There should not be any
  alignment assumptions about 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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number.
**/
typedef
VOID *
(EFIAPI *EFI_PEI_PCD_PPI_GET_EX_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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number.
  
  @return Boolean value for a given PCD token.
**/
typedef
BOOLEAN
(EFIAPI *EFI_PEI_PCD_PPI_GET_EX_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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number.  
  
  @return the size of the value for a given PCD token.
**/
typedef
UINTN
(EFIAPI *EFI_PEI_PCD_PPI_GET_EX_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 which namespace to extract the value from.
  @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_PEI_PCD_PPI_SET_EX_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 which namespace to extract the value from.
  @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_PEI_PCD_PPI_SET_EX_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 which namespace to extract the value from.
  @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_PEI_PCD_PPI_SET_EX_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 which namespace to extract the value from.
  @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_PEI_PCD_PPI_SET_EX_64)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        UINT64    Value
);

/**
  Sets a value of the 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 which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number. 
  @param[in]    SizeOfValue   The length of the Value being set 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_PEI_PCD_PPI_SET_EX_POINTER)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        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 which namespace to extract the value from.
  @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_PEI_PCD_PPI_SET_EX_BOOLEAN)(
  IN CONST  EFI_GUID  *Guid,
  IN        UINTN     TokenNumber,
  IN        BOOLEAN   Value
);

typedef
VOID
(EFIAPI *PCD_PPI_CALLBACK)(
  IN EFI_GUID *Guid     OPTIONAL,
  IN UINTN    CallBackToken,
  IN VOID     *TokenData,
  IN UINTN    TokenDatSize
);

/**
  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 which namespace to monitor. If NULL, use
                                  the standard platform namespace.
  @param[in]    CallBackToken     The PCD token number to monitor.
  @param[in]    CallBackFunction  The function prototype that will be 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_PEI_PCD_PPI_CALL_BACK_ON_SET)(
  IN CONST  EFI_GUID          *Guid   OPTIONAL,
  IN        UINTN             CallBackToken,
  IN        PCD_PPI_CALLBACK  CallBackFunction
);

/**
  Cancels a previously set callback function for a particular PCD token number.
  
  @param[in]  Guid              The 128-bit unique value that designates which namespace to monitor. If NULL, use
                                the standard platform namespace.
  @param[in]  CallBackToken     The PCD token number to cancel monitoring.
  @param[in]  CallBackFunction  The function prototype that was originally passed to the CallBackOnSet function.
  
  @retval     EFI_SUCCESS       The PCD service has cancelled the call event associated with the
                                CallBackToken.
  @retval     EFI_INVALID_PARAMETER   The PCD service did not match the CallBackFunction to one
                                      that is currently being monitored.
  @retval     EFI_NOT_FOUND     The PCD service could not find data the requested token number.                                 
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_PCD_PPI_CANCEL_CALL_BACK)(
  IN CONST  EFI_GUID          *Guid   OPTIONAL,
  IN        UINTN             CallBackToken,
  IN        PCD_PPI_CALLBACK  CallBackFunction
);

/**
  Retrieves the next valid PCD token for a given namespace.
  
  This provides a means by which to get the next valid token number in a given namespace. This is
  useful since the PCD infrastructure has a sparse list of token numbers in it, and one cannot a priori
  know what token numbers are valid in the database.
  
  @param[in]    Guid          The 128-bit unique value that designates which namespace to extract the value from.
  @param[in]    TokenNumber   The PCD token number. 
  
  @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_PEI_PCD_PPI_GET_NEXT_TOKEN)(
  IN CONST  EFI_GUID      *Guid     OPTIONAL,
  IN        UINTN         *TokenNumber
);

/**
  Retrieves the next valid PCD token namespace for a given namespace.
  
  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_PEI_PCD_PPI_GET_NEXT_TOKEN_SPACE)(
  IN OUT CONST EFI_GUID     **Guid
);

typedef struct {
  EFI_PEI_PCD_PPI_SET_SKU               SetSku;
  EFI_PEI_PCD_PPI_GET_EX_8              GetEx8;
  EFI_PEI_PCD_PPI_GET_EX_16             GetEx16;
  EFI_PEI_PCD_PPI_GET_EX_32             GetEx32;
  EFI_PEI_PCD_PPI_GET_EX_64             GetEx64;
  EFI_PEI_PCD_PPI_GET_EX_POINTER        GetExPtr;
  EFI_PEI_PCD_PPI_GET_EX_BOOLEAN        GetExBool;
  EFI_PEI_PCD_PPI_GET_EX_SIZE           GetExSize;
  EFI_PEI_PCD_PPI_SET_EX_8              SetEx8;
  EFI_PEI_PCD_PPI_SET_EX_16             SetEx16;
  EFI_PEI_PCD_PPI_SET_EX_32             SetEx32;
  EFI_PEI_PCD_PPI_SET_EX_64             SetEx64;
  EFI_PEI_PCD_PPI_SET_EX_POINTER        SetExPtr;
  EFI_PEI_PCD_PPI_SET_EX_BOOLEAN        SetExBool;
  EFI_PEI_PCD_PPI_CALLBACK_ON_SET       CallbackOnSet;
  EFI_PEI_PCD_PPI_CANCEL_CALLBACK       CancelCallback;
  EFI_PEI_PCD_PPI_GET_NEXT_TOKEN        GetNextToken;
  EFI_PEI_PCD_PPI_GET_NEXT_TOKEN_SPACE  GetNextTokenSpace;
} EFI_PEI_PCD_PPI;

#endif