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system76-edk2/MdeModulePkg/Universal/PCD/Pei/Service.h
klu2 a5eca427cb Add introduction of PCD database in PCD PEIM. 
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7973 6f19259b-4bc3-4df7-8a09-765794883524
2009-03-29 07:43:05 +00:00

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/** @file
The internal header file declares the private functions used by PeiPcd driver.
Copyright (c) 2006 - 2008, 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.
**/
#ifndef _PEI_PCD_SERVICE_H_
#define _PEI_PCD_SERVICE_H_
#include <PiPei.h>
#include <Ppi/ReadOnlyVariable2.h>
#include <Ppi/Pcd.h>
#include <Guid/PcdDataBaseHobGuid.h>
#include <Library/DebugLib.h>
#include <Library/PeimEntryPoint.h>
#include <Library/BaseLib.h>
#include <Library/HobLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/PcdLib.h>
#include <Library/BaseMemoryLib.h>
//
// Please make sure the PCD Serivce PEIM Version is consistent with
// the version of PCD Database generation tool
//
#define PCD_SERVICE_PEIM_VERSION 2
//
// PCD_PEI_DATABASE_GENTOOL_VERSION is defined in Autogen.h
// and generated by PCD Database generation tool.
//
//#if (PCD_SERVICE_PEIM_VERSION != PCD_PEI_SERVICE_DRIVER_AUTOGEN_VERSION )
// #error "Please make sure the version of PCD Service PEIM and PCD PEI Database Generation Tool matches"
//#endif
//
// PPI Interface Implementation Declaration.
//
/**
Sets the SKU value for subsequent calls to set or get PCD token values.
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 that will be used when the PCD service will retrieve and
set values associated with a PCD token.
**/
VOID
EFIAPI
PeiPcdSetSku (
IN UINTN SkuId
);
/**
Retrieves an 8-bit value for a given PCD token.
Retrieves the current byte-sized value for a PCD token number.
If the TokenNumber is invalid, the results are unpredictable.
@param[in] TokenNumber The PCD token number.
@return The UINT8 value.
**/
UINT8
EFIAPI
PeiPcdGet8 (
IN UINTN TokenNumber
);
/**
Retrieves an 16-bit value for a given PCD token.
Retrieves the current 16-bits value for a PCD token number.
If the TokenNumber is invalid, the results are unpredictable.
@param[in] TokenNumber The PCD token number.
@return The UINT16 value.
**/
UINT16
EFIAPI
PeiPcdGet16 (
IN UINTN TokenNumber
);
/**
Retrieves an 32-bit value for a given PCD token.
Retrieves the current 32-bits value for a PCD token number.
If the TokenNumber is invalid, the results are unpredictable.
@param[in] TokenNumber The PCD token number.
@return The UINT32 value.
**/
UINT32
EFIAPI
PeiPcdGet32 (
IN UINTN TokenNumber
);
/**
Retrieves an 64-bit value for a given PCD token.
Retrieves the current 64-bits value for a PCD token number.
If the TokenNumber is invalid, the results are unpredictable.
@param[in] TokenNumber The PCD token number.
@return The UINT64 value.
**/
UINT64
EFIAPI
PeiPcdGet64 (
IN UINTN TokenNumber
);
/**
Retrieves a pointer to a value for a given PCD token.
Retrieves the current pointer to the buffer 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] TokenNumber The PCD token number.
@return The pointer to the buffer to be retrived.
**/
VOID *
EFIAPI
PeiPcdGetPtr (
IN UINTN TokenNumber
);
/**
Retrieves a Boolean value for a given PCD token.
Retrieves the current boolean 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] TokenNumber The PCD token number.
@return The Boolean value.
**/
BOOLEAN
EFIAPI
PeiPcdGetBool (
IN UINTN TokenNumber
);
/**
Retrieves the size of the value for a given PCD token.
Retrieves the current size of a particular PCD token.
If the TokenNumber is invalid, the results are unpredictable.
@param[in] TokenNumber The PCD token number.
@return The size of the value for the PCD token.
**/
UINTN
EFIAPI
PeiPcdGetSize (
IN UINTN TokenNumber
);
/**
Retrieves an 8-bit value for a given PCD token.
Retrieves the 8-bit value of a particular PCD token.
If the TokenNumber is invalid or the token space
specified by Guid does not exist, the results are
unpredictable.
@param[in] Guid The token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The size 8-bit value for the PCD token.
**/
UINT8
EFIAPI
PeiPcdGet8Ex (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber
);
/**
Retrieves an 16-bit value for a given PCD token.
Retrieves the 16-bit value of a particular PCD token.
If the TokenNumber is invalid or the token space
specified by Guid does not exist, the results are
unpredictable.
@param[in] Guid The token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The size 16-bit value for the PCD token.
**/
UINT16
EFIAPI
PeiPcdGet16Ex (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber
);
/**
Retrieves an 32-bit value for a given PCD token.
Retrieves the 32-bit value of a particular PCD token.
If the TokenNumber is invalid or the token space
specified by Guid does not exist, the results are
unpredictable.
@param[in] Guid The token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The size 32-bit value for the PCD token.
**/
UINT32
EFIAPI
PeiPcdGet32Ex (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber
);
/**
Retrieves an 64-bit value for a given PCD token.
Retrieves the 64-bit value of a particular PCD token.
If the TokenNumber is invalid or the token space
specified by Guid does not exist, the results are
unpredictable.
@param[in] Guid The token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The size 64-bit value for the PCD token.
**/
UINT64
EFIAPI
PeiPcdGet64Ex (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber
);
/**
Retrieves a pointer to a value for a given PCD token.
Retrieves the current pointer to the buffer 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 token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The pointer to the buffer to be retrived.
**/
VOID *
EFIAPI
PeiPcdGetPtrEx (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber
);
/**
Retrieves an Boolean value for a given PCD token.
Retrieves the Boolean value of a particular PCD token.
If the TokenNumber is invalid or the token space
specified by Guid does not exist, the results are
unpredictable.
@param[in] Guid The token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The size Boolean value for the PCD token.
**/
BOOLEAN
EFIAPI
PeiPcdGetBoolEx (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber
);
/**
Retrieves the size of the value for a given PCD token.
Retrieves the current size of a particular PCD token.
If the TokenNumber is invalid, the results are unpredictable.
@param[in] Guid The token space for the token number.
@param[in] TokenNumber The PCD token number.
@return The size of the value for the PCD token.
**/
UINTN
EFIAPI
PeiPcdGetSizeEx (
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] TokenNumber The PCD token number.
@param[in] Value The value to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet8 (
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] TokenNumber The PCD token number.
@param[in] Value The value to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet16 (
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] TokenNumber The PCD token number.
@param[in] Value The value to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet32 (
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] TokenNumber The PCD token number.
@param[in] Value The value to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet64 (
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] TokenNumber The PCD token number.
@param[in, out] SizeOfBuffer A pointer to the length of the value being set for the PCD token.
On input, if the SizeOfValue is greater than the maximum size supported
for this TokenNumber then the output value of SizeOfValue will reflect
the maximum size supported for this TokenNumber.
@param[in] Buffer The buffer to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSetPtr (
IN UINTN TokenNumber,
IN OUT UINTN *SizeOfBuffer,
IN VOID *Buffer
);
/**
Sets an 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] TokenNumber The PCD token number.
@param[in] Value The value to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSetBool (
IN UINTN TokenNumber,
IN BOOLEAN Value
);
/**
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 Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet8Ex (
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 Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet16Ex (
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 Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet32Ex (
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 Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSet64Ex (
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, out] SizeOfBuffer A pointer to the length of the value being set for the PCD token.
On input, if the SizeOfValue is greater than the maximum size supported
for this TokenNumber then the output value of SizeOfValue will reflect
the maximum size supported for this TokenNumber.
@param[in] Buffer The buffer to set for the PCD token.
@retval EFI_SUCCESS Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSetPtrEx (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber,
IN OUT UINTN *SizeOfBuffer,
IN VOID *Buffer
);
/**
Sets an 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 Procedure returned successfully.
@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 GetSize() to retrieve the size of the target data.
@retval EFI_NOT_FOUND The PCD service could not find the requested token number.
**/
EFI_STATUS
EFIAPI
PeiPcdSetBoolEx (
IN CONST EFI_GUID *Guid,
IN UINTN TokenNumber,
IN BOOLEAN Value
);
/**
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] TokenNumber The PCD token number.
@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.
**/
EFI_STATUS
EFIAPI
PeiRegisterCallBackOnSet (
IN CONST EFI_GUID *Guid, OPTIONAL
IN UINTN TokenNumber,
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 the namespace from which to extract the value.
@param [in] TokenNumber The PCD token number.
@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.
**/
EFI_STATUS
EFIAPI
PcdUnRegisterCallBackOnSet (
IN CONST EFI_GUID *Guid, OPTIONAL
IN UINTN TokenNumber,
IN PCD_PPI_CALLBACK CallBackFunction
);
/**
Retrieves the next valid PCD token for a given namespace.
@param[in] Guid The 128-bit unique value that designates the namespace from which to extract the value.
@param[in, out] TokenNumber A pointer to the PCD token number to use to find the subsequent token number.
If the input token namespace or token number does not exist on the platform,
an error is returned and the value of *TokenNumber is undefined. To retrieve the "first" token,
have the pointer reference a TokenNumber value of 0. If the input token number is 0 and
there is no valid token number for this token namespace, *TokenNumber will be assigned to
0 and the function return EFI_SUCCESS. If the token number is the last valid token number,
*TokenNumber will be assigned to 0 and the function return EFI_SUCCESS.
@retval EFI_SUCCESS The PCD service retrieved the next valid token number. Or the input token number
is already the last valid token number in the PCD database.
In the later case, *TokenNumber is updated with the value of 0.
@retval EFI_NOT_FOUND If this input token number and token namespace does not exist on the platform.
**/
EFI_STATUS
EFIAPI
PeiPcdGetNextToken (
IN CONST EFI_GUID *Guid, OPTIONAL
IN OUT UINTN *TokenNumber
);
/**
Retrieves the next valid PCD token namespace for a given namespace.
@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 the input
token namespace does not exist on the platform, an error is returned and
the value of *Guid is undefined. If *Guid is NULL, then the GUID of the
first token space of the current platform is assigned to *Guid the function
return EFI_SUCCESS. If *Guid is NULL and there is no namespace exist in
the platform other than the default (NULL) tokennamespace, *Guid is unchanged
and the function return EFI_SUCCESS. If this input token namespace is the last
namespace on the platform, *Guid will be assigned to NULL and the function return
EFI_SUCCESS.
@retval EFI_SUCCESS The PCD service retrieved the next valid token space Guid.
Or the input token space Guid is already the last valid token space Guid
in the PCD database. In the later case, *Guid is updated with the value of NULL.
@retval EFI_NOT_FOUND If the input token namespace does not exist on the platform.
**/
EFI_STATUS
EFIAPI
PeiPcdGetNextTokenSpace (
IN OUT CONST EFI_GUID **Guid
);
/* Internal Function definitions */
/**
Get PCD database from GUID HOB in PEI phase.
@return Pointer to PCD database.
**/
PEI_PCD_DATABASE *
GetPcdDatabase (
VOID
);
/**
Wrapper function for setting non-pointer type value for a PCD entry.
@param TokenNumber Pcd token number autogenerated by build tools.
@param Data Value want to be set for PCD entry
@param Size Size of value.
@return status of SetWorker.
**/
EFI_STATUS
SetValueWorker (
IN UINTN TokenNumber,
IN VOID *Data,
IN UINTN Size
);
/**
Set value for an PCD entry
@param TokenNumber Pcd token number autogenerated by build tools.
@param Data Value want to be set for PCD entry
@param Size Size of value.
@param PtrType If TRUE, the type of PCD entry's value is Pointer.
If False, the type of PCD entry's value is not Pointer.
@retval EFI_INVALID_PARAMETER If this PCD type is VPD, VPD PCD can not be set.
@retval EFI_INVALID_PARAMETER If Size can not be set to size table.
@retval EFI_NOT_FOUND If value type of PCD entry is intergrate, but not in
range of UINT8, UINT16, UINT32, UINT64
@retval EFI_NOT_FOUND Can not find the PCD type according to token number.
**/
EFI_STATUS
SetWorker (
IN UINTN TokenNumber,
IN VOID *Data,
IN OUT UINTN *Size,
IN BOOLEAN PtrType
);
/**
Wrapper function for set PCD value for non-Pointer type dynamic-ex PCD.
@param ExTokenNumber Token number for dynamic-ex PCD.
@param Guid Token space guid for dynamic-ex PCD.
@param Data Value want to be set.
@param SetSize The size of value.
@return status of ExSetWorker().
**/
EFI_STATUS
ExSetValueWorker (
IN UINTN ExTokenNumber,
IN CONST EFI_GUID *Guid,
IN VOID *Data,
IN UINTN Size
);
/**
Set value for a dynamic PCD entry.
This routine find the local token number according to dynamic-ex PCD's token
space guid and token number firstly, and invoke callback function if this PCD
entry registered callback function. Finally, invoken general SetWorker to set
PCD value.
@param ExTokenNumber Dynamic-ex PCD token number.
@param Guid Token space guid for dynamic-ex PCD.
@param Data PCD value want to be set
@param SetSize Size of value.
@param PtrType If TRUE, this PCD entry is pointer type.
If FALSE, this PCD entry is not pointer type.
@return status of SetWorker().
**/
EFI_STATUS
ExSetWorker (
IN UINTN ExTokenNumber,
IN CONST EFI_GUID *Guid,
IN VOID *Data,
IN OUT UINTN *Size,
IN BOOLEAN PtrType
);
/**
Get the PCD entry pointer in PCD database.
This routine will visit PCD database to find the PCD entry according to given
token number. The given token number is autogened by build tools and it will be
translated to local token number. Local token number contains PCD's type and
offset of PCD entry in PCD database.
@param TokenNumber Token's number, it is autogened by build tools
@param GetSize The size of token's value
@return PCD entry pointer in PCD database
**/
VOID *
GetWorker (
IN UINTN TokenNumber,
IN UINTN GetSize
);
/**
Wrapper function for get PCD value for dynamic-ex PCD.
@param Guid Token space guid for dynamic-ex PCD.
@param ExTokenNumber Token number for dyanmic-ex PCD.
@param GetSize The size of dynamic-ex PCD value.
@return PCD entry in PCD database.
**/
VOID *
ExGetWorker (
IN CONST EFI_GUID *Guid,
IN UINTN ExTokenNumber,
IN UINTN GetSize
);
typedef struct {
UINTN TokenNumber;
UINTN Size;
UINT32 LocalTokenNumberAlias;
} EX_PCD_ENTRY_ATTRIBUTE;
/**
Get local token number according to dynamic-ex PCD's {token space guid:token number}
A dynamic-ex type PCD, developer must provide pair of token space guid: token number
in DEC file. PCD database maintain a mapping table that translate pair of {token
space guid: token number} to local token number.
@param Guid Token space guid for dynamic-ex PCD entry.
@param ExTokenNumber Token number for dynamic-ex PCD.
@return local token number for dynamic-ex PCD.
**/
UINTN
GetExPcdTokenNumber (
IN CONST EFI_GUID *Guid,
IN UINTN ExTokenNumber
);
/**
The function registers the CallBackOnSet fucntion
according to TokenNumber and EFI_GUID space.
@param TokenNumber The token number.
@param Guid The GUID space.
@param CallBackFunction The Callback function to be registered.
@param Register To register or unregister the callback function.
@retval EFI_SUCCESS If the Callback function is registered.
@retval EFI_NOT_FOUND If the PCD Entry is not found according to Token Number and GUID space.
@retval EFI_OUT_OF_RESOURCES If the callback function can't be registered because there is not free
slot left in the CallbackFnTable.
**/
EFI_STATUS
PeiRegisterCallBackWorker (
IN UINTN TokenNumber,
IN CONST EFI_GUID *Guid, OPTIONAL
IN PCD_PPI_CALLBACK CallBackFunction,
IN BOOLEAN Register
);
/**
The function builds the PCD database.
**/
VOID
BuildPcdDatabase (
VOID
);
/**
Get SKU ID tabble from PCD database.
@param LocalTokenNumberTableIdx Index of local token number in token number table.
@param Database PCD Database in PEI phase
@return Pointer to SKU ID array table
**/
SKU_ID *
GetSkuIdArray (
IN UINTN LocalTokenNumberTableIdx,
IN PEI_PCD_DATABASE *Database
);
/**
Get index of PCD entry in size table.
@param LocalTokenNumberTableIdx Index of this PCD in local token number table.
@param Database Pointer to PCD database.
@return index of PCD entry in size table.
**/
UINTN
GetSizeTableIndex (
IN UINTN LocalTokenNumberTableIdx,
IN PEI_PCD_DATABASE *Database
);
/**
Get PCD value's size for POINTER type PCD.
The POINTER type PCD's value will be stored into a buffer in specificed size.
The max size of this PCD's value is described in PCD's definition in DEC file.
@param LocalTokenNumberTableIdx Index of PCD token number in PCD token table
@param MaxSize Maxmium size of PCD's value
@param Database Pcd database in PEI phase.
@return PCD value's size for POINTER type PCD.
**/
UINTN
GetPtrTypeSize (
IN UINTN LocalTokenNumberTableIdx,
OUT UINTN *MaxSize,
IN PEI_PCD_DATABASE *Database
);
/**
Set PCD value's size for POINTER type PCD.
The POINTER type PCD's value will be stored into a buffer in specificed size.
The max size of this PCD's value is described in PCD's definition in DEC file.
@param LocalTokenNumberTableIdx Index of PCD token number in PCD token table
@param CurrentSize Maxmium size of PCD's value
@param Database Pcd database in PEI phase.
@retval TRUE Success to set PCD's value size, which is not exceed maxmium size
@retval FALSE Fail to set PCD's value size, which maybe exceed maxmium size
**/
BOOLEAN
SetPtrTypeSize (
IN UINTN LocalTokenNumberTableIdx,
IN OUT UINTN *CurrentSize,
IN PEI_PCD_DATABASE *Database
);
//
// The init Database created by PCD Database generation tool
//
extern PEI_PCD_DATABASE_INIT gPEIPcdDbInit;
#endif
////////////////////////////////////////////////////////////////////////////////
// //
// Introduction of PEI PCD database //
// //
////////////////////////////////////////////////////////////////////////////////
/**
1, Introduction
PEI PCD database hold all dynamic type PCD information used in PEI phase.
The structure of PEI PCD database is generated by build tools according to
dynamic PCD usage for specified platform.
2, Dynamic Type PCD
Dynamic type PCD is designed for accessing setting which value is determined
dynamic. In contrast, the value of static type PCD (FeatureFlag, FixedPcd,
PatchablePcd) is fixed in final generated FD image in build time.
2.1 The "dynamic" determination means:
a) The PCD value is produced by someone driver and consumed by other driver
in execution time.
b) The PCD value is set/get by user from FrontPage.
c) The PCD value is produced by platform OEM specified area.
2.2 According to distribution mehod, dynamic PCD could be classfied as:
a) Dynamic:
This type PCD is used for module in source distribution which will be
built in platform.
b) DynamicEx:
This type PCD is used for module in binary distribution which will be
will not built.
2.3 According to storage method, dynamic PCD could be classfied as:
a) Default Storage:
- The value is stored in PCD database maintained by PCD database in boot
time memory which is built as a guid hob in PEI phase.
- This type is used for communication between PEIM/DXE driver, DXE/DXE
driver. But all set/get value will be losted after boot-time memory
is turn off.
- [PcdsDynamicDefault]/[PcdsDynamicExDefault] is used as section name
for this type PCD in platform DSC file.
b) Variable Storage:
- The value is stored in variable area.
- As default storage type, this type PCD could used for communication.
But beside it, this type PCD could be used store the value associating
with HII setting via variable technology.
- In PEI phase, the PCD value could only be got but can not be set due
to variable area is readonly for PEI phase.
- [PcdsDynamicHii]/[PcdsDynamicExHii] is used as section name for this
type PCD in platform DSC file.
c) OEM specificed storage area:
- The value is stored in OEM specified area, the base address is specified
by a FixedAtBuild PCD PcdVpdBaseAddress.
- The area is read only for PEI and DXE phase.
- [PcdsDynamicVpd]/[PcdsDynamicExVpd] is used as section name for this
type PCD in platform DSC file.
Note: The default value of dynamic PCD are storaged in memory maintained
by PEI/DXE PCD drvier.
2.4 When and how to use dynamic PCD
Module developer do not care the used PCD is dynamic or static when writting
source code/INF. Dynamic PCD and dynamic type is pointed by platform integrator
in platform DSC file. Please ref section 2.3 to get matching between dynamic
PCD type and section name in DSC file.
3, PCD database:
Although dynamic PCD could be in different storage type as above description,
but the basic information and default value for all dynamic PCD is hold
by PCD database maintained by PEI/DXE driver.
As whole EFI BIOS boot path is divided into PEI/DXE phase, the PCD database
also is divided into Pei/Dxe database maintaied by PcdPeim/PcdDxe driver separatly.
To make PcdPeim's driver image smaller, PEI PCD database only hold all dynamic
PCD information used in PEI phase or use in both PEI/DXE phase. And DXE PCD
database contains all PCDs used in PEI/DXE phase in memory.
Build tool will generate PCD database into some C structure and variable for
PEI/DXE PCD driver according to dynamic PCD section in platform DSC file.
3.1 PcdPeim and PcdDxe
PEI PCD database is maintained by PcdPeim driver run from flash. PcdPeim driver
build guid hob in temporary memory and copy auto-generated C structure
to temporary memory for PEI PCD database.
DXE PCD database is maintained by PcdDxe driver.At entry point of PcdDxe driver,
a new PCD database is allocated in boot-time memory which including all
PEI PCD and DXE PCD entry.
Pcd driver should run as early as possible before any other driver access
dynamic PCD's value. PEI/DXE "Apriori File" mechanism make it possible by
making PcdPeim/PcdDxe as first dispatching driver in PEI/DXE phase.
3.2 Token space Guid/Token number, Platform token, Local token number
Dynamic PCD
+-----------+ +---------+
|TokenSpace | |Platform |
| Guid | build tool | Token |
| + +-------------->| Number |
| Token | +---------+`._
| Number | `.
+-----------+ `. +------+
`-|Local |
|Token |
DynamicEx PCD ,-|Number|
+-----------+ ,-' +------+
|TokenSpace | ,-'
| Guid | _,-'
| + +.'
| Token |
| Number |
+-----------+
3.2.1 Pair of Token space guid + Token number
Any type PCD is identified by pair of "TokenSpaceGuid + TokeNumber". But it
is not easy maintained by PCD driver, and hashed token number will make
searching slowly.
3.2.2 Platform Token Number
"Platform token number" concept is introduced for mapping to a pair of
"TokenSpaceGuid + TokenNumber". The platform token number is generated by
build tool in autogen.h and all of them are continual in a platform scope
started from 1.(0 meaning invalid internal token number)
With auto-generated "platform token number", PcdGet(PcdSampleDynamicPcd)
in source code is translated to LibPcdGet(_PCD_TOKEN_PcdSampleDynamicPcd)
in autogen.h.
Notes: The mapping between pair of "tokenspace guid + token number" and
"internal token number" need build tool establish, so "platform token number"
mechanism is not suitable for binary module which use DynamicEx type PCD.
To access a dynamicEx type PCD, pair of "token space guid/token number" all need
to be specificed for PcdSet/PcdGet accessing macro.
3.2.3 Local Token Number
To fast searching a PCD entry in PCD database, PCD driver translate
platform token number to local token number via a mapping table.
For binary DynamicEx type PCD, there is a another mapping table to translate
"token space guid + token number" to local token number directly.
Local token number is identifier for all internal interface in PCD PEI/DXE
driver.
A local token number is a 32-bit value in following meaning:
32 ------------- 28 ---------- 24 -------- 0
| PCD type mask | Datum Type | Offset |
+-----------------------------------------+
where:
PCd type mask: indicate Pcd type from following macro:
PCD_TYPE_DATA
PCD_TYPE_HII
PCD_TYPE_VPD
PCD_TYPE_SKU_ENABLED
PCD_TYPE_STRING
Datum Type : indicate PCD vaue type from following macro:
PCD_DATUM_TYPE_POINTER
PCD_DATUM_TYPE_UINT8
PCD_DATUM_TYPE_UINT16
PCD_DATUM_TYPE_UINT32
PCD_DATUM_TYPE_UINT64
Offset : indicate the related offset of PCD value in PCD database array.
Based on local token number, PCD driver could fast determine PCD type, value
type and get PCD entry from PCD database.
3.3 PCD Database C structure.
PCD Database C structure is generated by build tools in PCD driver's autogen.h/
autogen.c file. In generated C structure, following information is stored:
- ExMapTable: This table is used translate a binary dynamicex type PCD's
"tokenguid + token" to local token number.
- LocalTokenNumberTable:
This table stores all local token number in array, use "Internal
token number" as array index to get PCD entry's offset fastly.
- SizeTable: This table stores the size information for all PCD entry.
- GuidTable: This table stores guid value for DynamicEx's token space,
HII type PCD's variable.
- SkuIdTable: TBD
- SystemSkuId: TBD
- PCD value structure:
Every PCD has a value record in PCD database. For different
datum type PCD has different record structure which will be
introduced in 3.3.1
In a PCD database structure, there are two major area: Init and UnInit.
Init area is use stored above PCD internal structure such as ExMapTable,
LocalTokenNumberTable etc and the (default) value of PCD which has default
value specified in platform DSC file.
Unint area is used stored the value of PCD which has no default value in
platform DSC file, the value of NULL, 0 specified in platform DSC file can
be seemed as "no default value".
3.3.1 Simple Sample PCD Database C Structure
A general sample of PCD database structue is as follows:
typedef struct _PCD_DATABASE {
typedef struct _PCD_DATABASE_INIT {
//===== Following is PCD database internal maintain structures
DYNAMICEX_MAPPING ExMapTable[PEI_EXMAPPING_TABLE_SIZE];
UINT32 LocalTokenNumberTable[PEI_LOCAL_TOKEN_NUMBER_TABLE_SIZE];
GUID GuidTable[PEI_GUID_TABLE_SIZE];
SIZE_INFO SizeTable[PEI_SIZE_TABLE_SIZE];
UINT8 SkuIdTable[PEI_SKUID_TABLE_SIZE];
SKU_ID SystemSkuId;
//===== Following is value structure for PCD with default value
....
....
....
} Init;
typedef struct _PCD_DATABSE_UNINIT {
//==== Following is value structure for PCD without default value
....
....
} UnInit;
}
3.3.2 PCD value structure in PCD database C structure
The value's structure is generated by build tool in PCD database C structure.
The PCDs in different datum type has different value structure.
3.3.2.1 UINT8/UINT16/UINT32/UINT64 datum type PCD
The C structure for these datum type PCD is just a UINT8/UINT16/UINT32/UINT64
data member in PCD database, For example:
UINT16 PcdHardwareErrorRecordLevel_d3705011_bc19_4af7_be16_f68030378c15_VariableDefault_0;
Above structure is generated by build tool, the member name is "PcdCName_Guidvalue"
Member type is UINT16 according to PcdHardwareErrorRecordLevel declaration
in DEC file.
3.3.2.2 VOID* datum type PCD
The value of VOID* datum type PCD is a UINT8/UINT16 array in PCD database.
3.3.2.2.1 VOID* - string type
If the default value for VOID* datum type PCD like L"xxx", the PCD is
used for unicode string, and C structure of this datum type PCD is
UINT16 string array in PCD database, for example:
UINT16 StringTable[29];
The number of 29 in above sample is max size of a unicode string.
If the default value for VOID* datum type PCD like "xxx", the PCD is
used for ascii string, and C structure of this datum type PCD is
UINT8 string array in PCD database, for example:
UINT8 StringTable[20];
The number of 20 in above sample is max size of a ascii string.
3.3.2.2.2 VOID* - byte array
If the default value of VOID* datum type PCD like {'0x29', '0x01', '0xf2'}
the PCD is used for byte array. The generated structrue is same as
above ascii string table,
UINT8 StringTable[13];
The number of 13 in above sample is max size of byte array.
**/
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