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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7975 6f19259b-4bc3-4df7-8a09-765794883524
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klu2 2009-03-29 11:20:47 +00:00
parent cf84d2671a
commit 9e40e4bd0a
1 changed files with 37 additions and 24 deletions
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57
MdeModulePkg/Universal/PCD/Pei/Service.h
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@ -1014,7 +1014,7 @@ extern PEI_PCD_DATABASE_INIT gPEIPcdDbInit;
////////////////////////////////////////////////////////////////////////////////
// //
// Introduction of PEI PCD database //
// Introduction of PCD database //
// //
////////////////////////////////////////////////////////////////////////////////
/**
@ -1144,6 +1144,13 @@ extern PEI_PCD_DATABASE_INIT gPEIPcdDbInit;
To access a dynamicEx type PCD, pair of "token space guid/token number" all need
to be specificed for PcdSet/PcdGet accessing macro.
Platform Token Number is started from 1, and inceased continuous. From whole
platform scope, there are two zones: PEI Zone and DXE Zone
| Platform Token Number
----------|----------------------------------------------------------------
PEI Zone: | 1 ~ PEI_LOCAL_TOKEN_NUMBER
DXE Zone: | (PEI_LOCAL_TOKEN_NUMBER + 1) ~ (PEI_LOCAL_TOKEN_NUMBER + DXE_LOCAL_TOKEN_NUMBER)
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.
@ -1200,28 +1207,28 @@ extern PEI_PCD_DATABASE_INIT gPEIPcdDbInit;
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;
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;
}
//===== 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.
@ -1258,4 +1265,10 @@ extern PEI_PCD_DATABASE_INIT gPEIPcdDbInit;
UINT8 StringTable[13];
The number of 13 in above sample is max size of byte array.
3.3.3 Some utility structures in PCD Database
3.3.3.1 GuidTable
GuidTable array is used to store all related GUID value in PCD database:
- Variable GUID for HII type PCD
- Token space GUID for dynamicex type PCD
**/