[mirror_edk2.git] / MdeModulePkg / Universal / PCD / Pei / Pcd.inf

#/** @file\r
# PCD PEIM produces PCD database to manage all dynamic PCD in PEI phase and install Pcd Ppi service.\r
#\r
# ////////////////////////////////////////////////////////////////////////////////\r
# //                                                                            //\r
# //                      Introduction of PCD database                          //\r
# //                                                                            //\r
# ////////////////////////////////////////////////////////////////////////////////\r
#\r
# 1, Introduction\r
#    PCD database hold all dynamic type PCD information. The structure of PEI PCD \r
#    database is generated by build tools according to dynamic PCD usage for \r
#    specified platform.\r
#    \r
# 2, Dynamic Type PCD\r
#    Dynamic type PCD is used for the configuration/setting which value is determined\r
#    dynamic. In contrast, the value of static type PCD (FeatureFlag, FixedPcd, \r
#    PatchablePcd) is fixed in final generated FD image in build time. \r
#        \r
#    2.1 The "dynamic" determination means one of below cases:\r
#      a) The PCD setting value is produced by someone driver and consumed by \r
#         other driver in execution time.\r
#      b) The PCD setting value is set/get by user from FrontPage.\r
#      c) The PCD setting value is produced by platform OEM vendor in specified area.\r
#    \r
#    2.2 According to module distribution way, dynamic PCD could be classfied as:\r
#      a) Dynamic:\r
#         If module is released in source code and will be built with platform \r
#         DSC, the dynamic PCD used by this module can be accessed as:\r
#                 PcdGetxx(PcdSampleDynamicPcd); \r
#         In building platform, build tools will translate PcdSampleDynamicPcd to\r
#         pair of {Token Space Guid: Token Number} for this PCD. \r
#      b) DynamicEx:\r
#         If module is release as binary and will not pariticpate platform building,\r
#         the dynamic PCD used by this module need be accessed as:\r
#               PcdGetxxEx(gEfiMyTokenspaceGuid, PcdSampleDynamicPcd)\r
#         Developer need explicity gives {Token Space Guid:Token Number} as parameter\r
#         in writting source code.\r
#         \r
#    2.3 According to PCD value's storage method, dynamic PCD could be classfied as:\r
#      a) Default Storage: \r
#         - The PCD value is stored in PCD database maintained by PCD driver in boot \r
#           time memory.\r
#         - This type is used for communication between PEIM/DXE driver, DXE/DXE \r
#           driver. But all set/get value will be losted after boot-time memory \r
#           is turn off.\r
#         - [PcdsDynamicDefault] is used as section name for this type PCD in \r
#           platform DSC file. [PcdsDynamicExDefault] is used for dynamicEx type PCD.\r
#         \r
#      b) Variable Storage: \r
#         - The PCD value is stored in variable area. \r
#         - As default storage type, this type PCD could be used for PEI/DXE driver\r
#           communication. But beside it, this type PCD could alsp be used to store \r
#           the value associate with a HII setting via variable interface.\r
#         - In PEI phase, the PCD value could only be got but can not be set due \r
#           to variable area is readonly.\r
#         - [PcdsDynamicHii] is used as section name for this type PCD in platform \r
#           DSC file. [PcdsDynamicExHii] is for dynamicEx type PCD.\r
#           \r
#      c) OEM specificed storage area:\r
#         - The PCD value is stored in OEM specified area which base address is \r
#           specified by a FixedAtBuild PCD setting - PcdVpdBaseAddress.\r
#         - The area is read only for PEI and DXE phase.\r
#         - [PcdsDynamicVpd] is used as section name for this type PCD in platform \r
#           DSC file. [PcdsDynamicExVpd] is for dynamicex type PCD.\r
#      \r
#    2.4 When and how to use dynamic PCD\r
#      Module developer do not care the used PCD is dynamic or static when writting\r
#      source code/INF. Dynamic PCD and dynamic type is pointed by platform integrator \r
#      in platform DSC file. Please ref section 2.3 to get matching between dynamic\r
#      PCD type and section name in DSC file.\r
#    \r
# 3, PCD database:\r
#    Although dynamic PCD could be in different storage type as above description, \r
#    but the basic information and default value for all dynamic PCD is hold\r
#    by PCD database maintained by PEI/DXE driver.\r
#    \r
#    As the whole EFI BIOS boot path is divided into PEI/DXE phase, the PCD database\r
#    also is divided into Pei/Dxe database maintaied by PcdPeim/PcdDxe driver separatly.\r
#    To make PcdPeim's driver image smaller, PEI PCD database only hold all dynamic\r
#    PCD information used in PEI phase or use in both PEI/DXE phase. And DXE PCD\r
#    database contains all PCDs used in PEI/DXE phase in memory.\r
#    \r
#    Build tool will generate PCD database into some C structure and variable for \r
#    PEI/DXE PCD driver according to dynamic PCD section in platform DSC file. \r
#    \r
#    3.1 PcdPeim and PcdDxe\r
#      PEI PCD database is maintained by PcdPeim driver run from flash. PcdPeim driver\r
#      build guid hob in temporary memory and copy auto-generated C structure \r
#      to temporary memory for PEI PCD database. \r
#      DXE PCD database is maintained by PcdDxe driver.At entry point of PcdDxe driver,\r
#      a new PCD database is allocated in boot-time memory which including all\r
#      PEI PCD and DXE PCD entry.\r
#      \r
#      Pcd driver should run as early as possible before any other driver access\r
#      dynamic PCD's value. PEI/DXE "Apriori File" mechanism make it possible by\r
#      making PcdPeim/PcdDxe as first dispatching driver in PEI/DXE phase.\r
#      \r
#    3.2 Token space Guid/Token number, Platform token, Local token number\r
#           Dynamic PCD\r
#          +-----------+               +---------+\r
#          |TokenSpace |               |Platform |\r
#          |   Guid    |  build tool   | Token   |\r
#          |    +      +-------------->| Number  |\r
#          |  Token    |               +---------+`._\r
#          |  Number   |                             `.\r
#          +-----------+                               `.  +------+\r
#                                                        `-|Local |\r
#                                                          |Token |\r
#                               DynamicEx PCD            ,-|Number|\r
#                               +-----------+         ,-'  +------+\r
#                               |TokenSpace |      ,-'\r
#                               |   Guid    |  _,-'\r
#                               |    +      +.'\r
#                               |  Token    |\r
#                               |  Number   |\r
#                               +-----------+\r
#    \r
#    \r
#      3.2.1 Pair of Token space guid + Token number\r
#        Any type PCD is identified by pair of "TokenSpaceGuid + TokeNumber". But it\r
#        is not easy maintained by PCD driver, and hashed token number will make \r
#        searching slowly. \r
#\r
#      3.2.2 Platform Token Number\r
#        "Platform token number" concept is introduced for mapping to a pair of \r
#        "TokenSpaceGuid + TokenNumber". The platform token number is generated by \r
#        build tool in autogen.h and all of them are continual in a platform scope \r
#        started from 1.(0 meaning invalid internal token number)\r
#        With auto-generated "platform token number", PcdGet(PcdSampleDynamicPcd)\r
#        in source code is translated to LibPcdGet(_PCD_TOKEN_PcdSampleDynamicPcd) \r
#        in autogen.h.\r
#        Notes: The mapping between pair of "tokenspace guid + token number" and\r
#        "internal token number" need build tool establish, so "platform token number"\r
#        mechanism is not suitable for binary module which use DynamicEx type PCD.\r
#        To access a dynamicEx type PCD, pair of "token space guid/token number" all need\r
#        to be specificed for PcdSet/PcdGet accessing macro.\r
#      \r
#        Platform Token Number is started from 1, and inceased continuous. From whole \r
#        platform scope, there are two zones: PEI Zone and DXE Zone\r
#                  |                      Platform Token Number\r
#        ----------|----------------------------------------------------------------\r
#        PEI Zone: |            1                 ~  PEI_LOCAL_TOKEN_NUMBER\r
#        DXE Zone: | (PEI_LOCAL_TOKEN_NUMBER + 1) ~ (PEI_LOCAL_TOKEN_NUMBER + DXE_LOCAL_TOKEN_NUMBER)\r
#        \r
#      3.2.3 Local Token Number\r
#        To fast searching a PCD entry in PCD database, PCD driver translate \r
#        platform token number to local token number via a mapping table.\r
#        For binary DynamicEx type PCD, there is a another mapping table to translate\r
#        "token space guid + token number" to local token number directly.\r
#        Local token number is identifier for all internal interface in PCD PEI/DXE\r
#        driver.\r
#        \r
#        A local token number is a 32-bit value in following meaning:\r
#         32 ------------- 28 ---------- 24 -------- 0\r
#          | PCD type mask  | Datum Type  |  Offset  |\r
#          +-----------------------------------------+\r
#        where:\r
#          PCd type mask: indicate Pcd type from following macro:\r
#                         PCD_TYPE_DATA\r
#                         PCD_TYPE_HII\r
#                         PCD_TYPE_VPD\r
#                         PCD_TYPE_SKU_ENABLED\r
#                         PCD_TYPE_STRING\r
#          Datum Type   : indicate PCD vaue type from following macro:\r
#                         PCD_DATUM_TYPE_POINTER\r
#                         PCD_DATUM_TYPE_UINT8\r
#                         PCD_DATUM_TYPE_UINT16\r
#                         PCD_DATUM_TYPE_UINT32\r
#                         PCD_DATUM_TYPE_UINT64\r
#          Offset      : indicate the related offset of PCD value in PCD database array.\r
#       Based on local token number, PCD driver could fast determine PCD type, value\r
#       type and get PCD entry from PCD database.\r
#       \r
#    3.3 PCD Database C structure.\r
#      PCD Database C structure is generated by build tools in PCD driver's autogen.h/\r
#      autogen.c file. In generated C structure, following information is stored:\r
#      - ExMapTable: This table is used translate a binary dynamicex type PCD's \r
#                    "tokenguid + token" to local token number.\r
#      - LocalTokenNumberTable:\r
#                    This table stores all local token number in array, use "Internal\r
#                    token number" as array index to get PCD entry's offset fastly.\r
#      - SizeTable:  This table stores the size information for all PCD entry.\r
#      - GuidTable:  This table stores guid value for DynamicEx's token space,\r
#                    HII type PCD's variable.\r
#      - SkuIdTable: TBD\r
#      - SystemSkuId: TBD\r
#      - PCD value structure:  \r
#                    Every PCD has a value record in PCD database. For different\r
#                    datum type PCD has different record structure which will be \r
#                    introduced in 3.3.1\r
#      \r
#      In a PCD database structure, there are two major area: Init and UnInit. \r
#      Init area is use stored above PCD internal structure such as ExMapTable, \r
#      LocalTokenNumberTable etc and the (default) value of PCD which has default \r
#      value specified in platform DSC file.\r
#      Unint area is used stored the value of PCD which has no default value in\r
#      platform DSC file, the value of NULL, 0 specified in platform DSC file can\r
#      be seemed as "no default value".\r
#      \r
#      3.3.1 Simple Sample PCD Database C Structure\r
#        A general sample of PCD database structue is as follows:\r
#        typedef struct _PCD_DATABASE {\r
#          typedef struct _PCD_DATABASE_INIT {\r
#            //===== Following is PCD database internal maintain structures\r
#            DYNAMICEX_MAPPING ExMapTable[PEI_EXMAPPING_TABLE_SIZE];\r
#            UINT32            LocalTokenNumberTable[PEI_LOCAL_TOKEN_NUMBER_TABLE_SIZE];\r
#            GUID              GuidTable[PEI_GUID_TABLE_SIZE];\r
#            SIZE_INFO         SizeTable[PEI_SIZE_TABLE_SIZE];\r
#            UINT8             SkuIdTable[PEI_SKUID_TABLE_SIZE];\r
#            SKU_ID            SystemSkuId;\r
#            \r
#            //===== Following is value structure for PCD with default value\r
#            ....\r
#            ....\r
#            ....\r
#          } Init;\r
#          typedef struct _PCD_DATABSE_UNINIT {\r
#            //==== Following is value structure for PCD without default value\r
#            ....\r
#            ....\r
#          } UnInit;\r
#        }\r
#      \r
#      3.3.2 PCD value structure in PCD database C structure\r
#        The value's structure is generated by build tool in PCD database C structure.\r
#        The PCDs in different datum type has different value structure.\r
#        \r
#        3.3.2.1 UINT8/UINT16/UINT32/UINT64 datum type PCD\r
#          The C structure for these datum type PCD is just a UINT8/UINT16/UINT32/UINT64\r
#          data member in PCD database, For example:\r
#          UINT16  PcdHardwareErrorRecordLevel_d3705011_bc19_4af7_be16_f68030378c15_VariableDefault_0;\r
#          Above structure is generated by build tool, the member name is "PcdCName_Guidvalue"\r
#          Member type is UINT16 according to PcdHardwareErrorRecordLevel declaration\r
#          in DEC file.\r
#          \r
#        3.3.2.2 VOID* datum type PCD\r
#          The value of VOID* datum type PCD is a UINT8/UINT16 array in PCD database.\r
#          \r
#          3.3.2.2.1 VOID* - string type\r
#            If the default value for VOID* datum type PCD like L"xxx", the PCD is \r
#            used for unicode string, and C structure of this datum type PCD is \r
#            UINT16 string array in PCD database, for example:\r
#            UINT16 StringTable[29];\r
#            The number of 29 in above sample is max size of a unicode string.\r
#            \r
#            If the default value for VOID* datum type PCD like "xxx", the PCD is\r
#            used for ascii string, and C structure of this datum type PCD is \r
#            UINT8 string array in PCD database, for example:\r
#            UINT8 StringTable[20];\r
#            The number of 20 in above sample is max size of a ascii string.\r
#            \r
#          3.3.2.2.2 VOID* - byte array\r
#            If the default value of VOID* datum type PCD like {'0x29', '0x01', '0xf2'}\r
#            the PCD is used for byte array. The generated structrue is same as \r
#            above ascii string table,\r
#            UINT8 StringTable[13];\r
#            The number of 13 in above sample is max size of byte array.\r
#       \r
#      3.3.3 Some utility structures in PCD Database\r
#        3.3.3.1 GuidTable\r
#          GuidTable array is used to store all related GUID value in PCD database:\r
#            - Variable GUID for HII type PCD\r
#            - Token space GUID for dynamicex type PCD \r
#    \r
# Copyright (c) 2006 - 2008, Intel Corporation\r
#\r
#  All rights reserved. This program and the accompanying materials\r
#  are licensed and made available under the terms and conditions of the BSD License\r
#  which accompanies this distribution. The full text of the license may be found at\r
#  http://opensource.org/licenses/bsd-license.php\r
#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#\r
#\r
#**/\r
\r
[Defines]\r
  INF_VERSION                    = 0x00010005\r
  BASE_NAME                      = PcdPeim\r
  FILE_GUID                      = 9B3ADA4F-AE56-4c24-8DEA-F03B7558AE50\r
  MODULE_TYPE                    = PEIM\r
  VERSION_STRING                 = 1.0\r
  PCD_IS_DRIVER                  = PEI_PCD_DRIVER\r
  ENTRY_POINT                    = PcdPeimInit\r
\r
#\r
# The following information is for reference only and not required by the build tools.\r
#\r
#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC (EBC is for build only)\r
#\r
\r
[Sources.common]\r
  Service.c\r
  Service.h\r
  Pcd.c\r
\r
[Packages]\r
  MdePkg/MdePkg.dec\r
  MdeModulePkg/MdeModulePkg.dec\r
\r
[LibraryClasses]\r
  BaseMemoryLib\r
  PcdLib\r
  PeiServicesLib\r
  HobLib\r
  BaseLib\r
  PeimEntryPoint\r
  DebugLib\r
\r
[Guids]\r
  gPcdDataBaseHobGuid                           ## PRODUCES  ## Hob\r
  gPcdDataBaseHobGuid                           ## CONSUMES  ## Hob\r
\r
[Ppis]\r
  gEfiPeiReadOnlyVariable2PpiGuid               ## CONSUMES\r
  gPcdPpiGuid                                   ## PRODUCES\r
\r
[FeaturePcd]\r
  gEfiMdeModulePkgTokenSpaceGuid.PcdPeiFullPcdDatabaseEnable\r
\r
[FixedPcd]\r
  gEfiMdeModulePkgTokenSpaceGuid.PcdVpdBaseAddress\r
  gEfiMdeModulePkgTokenSpaceGuid.PcdMaxPeiPcdCallBackNumberPerPcdEntry || PcdPeiFullPcdDatabaseEnable\r
\r
[Depex]\r
  TRUE\r
\r
Commit	Line	Data
80408db0	1	#/** @file\r
68dbca6c	2	# PCD PEIM produces PCD database to manage all dynamic PCD in PEI phase and install Pcd Ppi service.\r
80408db0	3	#\r
b6b3dc44	4	# ////////////////////////////////////////////////////////////////////////////////\r
	5	# // //\r
	6	# // Introduction of PCD database //\r
	7	# // //\r
	8	# ////////////////////////////////////////////////////////////////////////////////\r
	9	#\r
	10	# 1, Introduction\r
	11	# PCD database hold all dynamic type PCD information. The structure of PEI PCD \r
	12	# database is generated by build tools according to dynamic PCD usage for \r
	13	# specified platform.\r
	14	# \r
	15	# 2, Dynamic Type PCD\r
	16	# Dynamic type PCD is used for the configuration/setting which value is determined\r
	17	# dynamic. In contrast, the value of static type PCD (FeatureFlag, FixedPcd, \r
	18	# PatchablePcd) is fixed in final generated FD image in build time. \r
	19	# \r
	20	# 2.1 The "dynamic" determination means one of below cases:\r
	21	# a) The PCD setting value is produced by someone driver and consumed by \r
	22	# other driver in execution time.\r
	23	# b) The PCD setting value is set/get by user from FrontPage.\r
	24	# c) The PCD setting value is produced by platform OEM vendor in specified area.\r
	25	# \r
	26	# 2.2 According to module distribution way, dynamic PCD could be classfied as:\r
	27	# a) Dynamic:\r
	28	# If module is released in source code and will be built with platform \r
	29	# DSC, the dynamic PCD used by this module can be accessed as:\r
	30	# PcdGetxx(PcdSampleDynamicPcd); \r
	31	# In building platform, build tools will translate PcdSampleDynamicPcd to\r
	32	# pair of {Token Space Guid: Token Number} for this PCD. \r
	33	# b) DynamicEx:\r
	34	# If module is release as binary and will not pariticpate platform building,\r
	35	# the dynamic PCD used by this module need be accessed as:\r
	36	# PcdGetxxEx(gEfiMyTokenspaceGuid, PcdSampleDynamicPcd)\r
	37	# Developer need explicity gives {Token Space Guid:Token Number} as parameter\r
	38	# in writting source code.\r
	39	# \r
	40	# 2.3 According to PCD value's storage method, dynamic PCD could be classfied as:\r
	41	# a) Default Storage: \r
	42	# - The PCD value is stored in PCD database maintained by PCD driver in boot \r
	43	# time memory.\r
	44	# - This type is used for communication between PEIM/DXE driver, DXE/DXE \r
	45	# driver. But all set/get value will be losted after boot-time memory \r
	46	# is turn off.\r
	47	# - [PcdsDynamicDefault] is used as section name for this type PCD in \r
	48	# platform DSC file. [PcdsDynamicExDefault] is used for dynamicEx type PCD.\r
	49	# \r
	50	# b) Variable Storage: \r
	51	# - The PCD value is stored in variable area. \r
	52	# - As default storage type, this type PCD could be used for PEI/DXE driver\r
	53	# communication. But beside it, this type PCD could alsp be used to store \r
	54	# the value associate with a HII setting via variable interface.\r
	55	# - In PEI phase, the PCD value could only be got but can not be set due \r
	56	# to variable area is readonly.\r
	57	# - [PcdsDynamicHii] is used as section name for this type PCD in platform \r
	58	# DSC file. [PcdsDynamicExHii] is for dynamicEx type PCD.\r
	59	# \r
	60	# c) OEM specificed storage area:\r
	61	# - The PCD value is stored in OEM specified area which base address is \r
	62	# specified by a FixedAtBuild PCD setting - PcdVpdBaseAddress.\r
	63	# - The area is read only for PEI and DXE phase.\r
	64	# - [PcdsDynamicVpd] is used as section name for this type PCD in platform \r
	65	# DSC file. [PcdsDynamicExVpd] is for dynamicex type PCD.\r
	66	# \r
	67	# 2.4 When and how to use dynamic PCD\r
68	# Module developer do not care the used PCD is dynamic or static when writting\r
69	# source code/INF. Dynamic PCD and dynamic type is pointed by platform integrator \r
70	# in platform DSC file. Please ref section 2.3 to get matching between dynamic\r
71	# PCD type and section name in DSC file.\r
72	# \r
73	# 3, PCD database:\r
74	# Although dynamic PCD could be in different storage type as above description, \r
75	# but the basic information and default value for all dynamic PCD is hold\r
76	# by PCD database maintained by PEI/DXE driver.\r
77	# \r
78	# As the whole EFI BIOS boot path is divided into PEI/DXE phase, the PCD database\r
79	# also is divided into Pei/Dxe database maintaied by PcdPeim/PcdDxe driver separatly.\r
80	# To make PcdPeim's driver image smaller, PEI PCD database only hold all dynamic\r
81	# PCD information used in PEI phase or use in both PEI/DXE phase. And DXE PCD\r
82	# database contains all PCDs used in PEI/DXE phase in memory.\r
83	# \r
84	# Build tool will generate PCD database into some C structure and variable for \r
85	# PEI/DXE PCD driver according to dynamic PCD section in platform DSC file. \r
86	# \r
87	# 3.1 PcdPeim and PcdDxe\r
88	# PEI PCD database is maintained by PcdPeim driver run from flash. PcdPeim driver\r
89	# build guid hob in temporary memory and copy auto-generated C structure \r
90	# to temporary memory for PEI PCD database. \r
91	# DXE PCD database is maintained by PcdDxe driver.At entry point of PcdDxe driver,\r
92	# a new PCD database is allocated in boot-time memory which including all\r
93	# PEI PCD and DXE PCD entry.\r
94	# \r
95	# Pcd driver should run as early as possible before any other driver access\r
96	# dynamic PCD's value. PEI/DXE "Apriori File" mechanism make it possible by\r
97	# making PcdPeim/PcdDxe as first dispatching driver in PEI/DXE phase.\r
98	# \r
99	# 3.2 Token space Guid/Token number, Platform token, Local token number\r
100	# Dynamic PCD\r
101	# +-----------+ +---------+\r
102	# \|TokenSpace \| \|Platform \|\r
103	# \| Guid \| build tool \| Token \|\r
104	# \| + +-------------->\| Number \|\r
105	# \| Token \| +---------+`._\r
106	# \| Number \| `.\r
107	# +-----------+ `. +------+\r
108	# `-\|Local \|\r
109	# \|Token \|\r
110	# DynamicEx PCD ,-\|Number\|\r
111	# +-----------+ ,-' +------+\r
112	# \|TokenSpace \| ,-'\r
113	# \| Guid \| _,-'\r
114	# \| + +.'\r
115	# \| Token \|\r
116	# \| Number \|\r
117	# +-----------+\r
118	# \r
119	# \r
120	# 3.2.1 Pair of Token space guid + Token number\r
121	# Any type PCD is identified by pair of "TokenSpaceGuid + TokeNumber". But it\r
122	# is not easy maintained by PCD driver, and hashed token number will make \r
123	# searching slowly. \r
124	#\r
125	# 3.2.2 Platform Token Number\r
126	# "Platform token number" concept is introduced for mapping to a pair of \r
127	# "TokenSpaceGuid + TokenNumber". The platform token number is generated by \r
128	# build tool in autogen.h and all of them are continual in a platform scope \r
129	# started from 1.(0 meaning invalid internal token number)\r
130	# With auto-generated "platform token number", PcdGet(PcdSampleDynamicPcd)\r
131	# in source code is translated to LibPcdGet(_PCD_TOKEN_PcdSampleDynamicPcd) \r
132	# in autogen.h.\r
133	# Notes: The mapping between pair of "tokenspace guid + token number" and\r
134	# "internal token number" need build tool establish, so "platform token number"\r
135	# mechanism is not suitable for binary module which use DynamicEx type PCD.\r
136	# To access a dynamicEx type PCD, pair of "token space guid/token number" all need\r
137	# to be specificed for PcdSet/PcdGet accessing macro.\r
138	# \r
139	# Platform Token Number is started from 1, and inceased continuous. From whole \r
140	# platform scope, there are two zones: PEI Zone and DXE Zone\r
141	# \| Platform Token Number\r
142	# ----------\|----------------------------------------------------------------\r
143	# PEI Zone: \| 1 ~ PEI_LOCAL_TOKEN_NUMBER\r
144	# DXE Zone: \| (PEI_LOCAL_TOKEN_NUMBER + 1) ~ (PEI_LOCAL_TOKEN_NUMBER + DXE_LOCAL_TOKEN_NUMBER)\r
145	# \r
146	# 3.2.3 Local Token Number\r
147	# To fast searching a PCD entry in PCD database, PCD driver translate \r
148	# platform token number to local token number via a mapping table.\r
149	# For binary DynamicEx type PCD, there is a another mapping table to translate\r
150	# "token space guid + token number" to local token number directly.\r
151	# Local token number is identifier for all internal interface in PCD PEI/DXE\r
152	# driver.\r
153	# \r
154	# A local token number is a 32-bit value in following meaning:\r
155	# 32 ------------- 28 ---------- 24 -------- 0\r
156	# \| PCD type mask \| Datum Type \| Offset \|\r
157	# +-----------------------------------------+\r
158	# where:\r
159	# PCd type mask: indicate Pcd type from following macro:\r
160	# PCD_TYPE_DATA\r
161	# PCD_TYPE_HII\r
162	# PCD_TYPE_VPD\r
163	# PCD_TYPE_SKU_ENABLED\r
164	# PCD_TYPE_STRING\r
165	# Datum Type : indicate PCD vaue type from following macro:\r
166	# PCD_DATUM_TYPE_POINTER\r
167	# PCD_DATUM_TYPE_UINT8\r
168	# PCD_DATUM_TYPE_UINT16\r
169	# PCD_DATUM_TYPE_UINT32\r
170	# PCD_DATUM_TYPE_UINT64\r
171	# Offset : indicate the related offset of PCD value in PCD database array.\r
172	# Based on local token number, PCD driver could fast determine PCD type, value\r
173	# type and get PCD entry from PCD database.\r
174	# \r
175	# 3.3 PCD Database C structure.\r
176	# PCD Database C structure is generated by build tools in PCD driver's autogen.h/\r
177	# autogen.c file. In generated C structure, following information is stored:\r
178	# - ExMapTable: This table is used translate a binary dynamicex type PCD's \r
179	# "tokenguid + token" to local token number.\r
180	# - LocalTokenNumberTable:\r
181	# This table stores all local token number in array, use "Internal\r
182	# token number" as array index to get PCD entry's offset fastly.\r
183	# - SizeTable: This table stores the size information for all PCD entry.\r
184	# - GuidTable: This table stores guid value for DynamicEx's token space,\r
185	# HII type PCD's variable.\r
186	# - SkuIdTable: TBD\r
187	# - SystemSkuId: TBD\r
188	# - PCD value structure: \r
189	# Every PCD has a value record in PCD database. For different\r
190	# datum type PCD has different record structure which will be \r
191	# introduced in 3.3.1\r
192	# \r
193	# In a PCD database structure, there are two major area: Init and UnInit. \r
194	# Init area is use stored above PCD internal structure such as ExMapTable, \r
195	# LocalTokenNumberTable etc and the (default) value of PCD which has default \r
196	# value specified in platform DSC file.\r
197	# Unint area is used stored the value of PCD which has no default value in\r
198	# platform DSC file, the value of NULL, 0 specified in platform DSC file can\r
199	# be seemed as "no default value".\r
200	# \r
201	# 3.3.1 Simple Sample PCD Database C Structure\r
202	# A general sample of PCD database structue is as follows:\r
203	# typedef struct _PCD_DATABASE {\r
204	# typedef struct _PCD_DATABASE_INIT {\r
205	# //===== Following is PCD database internal maintain structures\r
206	# DYNAMICEX_MAPPING ExMapTable[PEI_EXMAPPING_TABLE_SIZE];\r
207	# UINT32 LocalTokenNumberTable[PEI_LOCAL_TOKEN_NUMBER_TABLE_SIZE];\r
208	# GUID GuidTable[PEI_GUID_TABLE_SIZE];\r
209	# SIZE_INFO SizeTable[PEI_SIZE_TABLE_SIZE];\r
210	# UINT8 SkuIdTable[PEI_SKUID_TABLE_SIZE];\r
211	# SKU_ID SystemSkuId;\r
212	# \r
213	# //===== Following is value structure for PCD with default value\r
214	# ....\r
215	# ....\r
216	# ....\r
217	# } Init;\r
218	# typedef struct _PCD_DATABSE_UNINIT {\r
219	# //==== Following is value structure for PCD without default value\r
220	# ....\r
221	# ....\r
222	# } UnInit;\r
223	# }\r
224	# \r
225	# 3.3.2 PCD value structure in PCD database C structure\r
226	# The value's structure is generated by build tool in PCD database C structure.\r
227	# The PCDs in different datum type has different value structure.\r
228	# \r
229	# 3.3.2.1 UINT8/UINT16/UINT32/UINT64 datum type PCD\r
230	# The C structure for these datum type PCD is just a UINT8/UINT16/UINT32/UINT64\r
231	# data member in PCD database, For example:\r
232	# UINT16 PcdHardwareErrorRecordLevel_d3705011_bc19_4af7_be16_f68030378c15_VariableDefault_0;\r
233	# Above structure is generated by build tool, the member name is "PcdCName_Guidvalue"\r
234	# Member type is UINT16 according to PcdHardwareErrorRecordLevel declaration\r
235	# in DEC file.\r
236	# \r
237	# 3.3.2.2 VOID* datum type PCD\r
238	# The value of VOID* datum type PCD is a UINT8/UINT16 array in PCD database.\r
239	# \r
240	# 3.3.2.2.1 VOID* - string type\r
241	# If the default value for VOID* datum type PCD like L"xxx", the PCD is \r
242	# used for unicode string, and C structure of this datum type PCD is \r
243	# UINT16 string array in PCD database, for example:\r
244	# UINT16 StringTable[29];\r
245	# The number of 29 in above sample is max size of a unicode string.\r
246	# \r
247	# If the default value for VOID* datum type PCD like "xxx", the PCD is\r
248	# used for ascii string, and C structure of this datum type PCD is \r
249	# UINT8 string array in PCD database, for example:\r
250	# UINT8 StringTable[20];\r
251	# The number of 20 in above sample is max size of a ascii string.\r
252	# \r
253	# 3.3.2.2.2 VOID* - byte array\r
254	# If the default value of VOID* datum type PCD like {'0x29', '0x01', '0xf2'}\r
255	# the PCD is used for byte array. The generated structrue is same as \r
256	# above ascii string table,\r
257	# UINT8 StringTable[13];\r
258	# The number of 13 in above sample is max size of byte array.\r
259	# \r
260	# 3.3.3 Some utility structures in PCD Database\r
261	# 3.3.3.1 GuidTable\r
262	# GuidTable array is used to store all related GUID value in PCD database:\r
263	# - Variable GUID for HII type PCD\r
264	# - Token space GUID for dynamicex type PCD \r
265	# \r
cebc8d48	266	# Copyright (c) 2006 - 2008, Intel Corporation\r
80408db0	267	#\r
	268	# All rights reserved. This program and the accompanying materials\r
	269	# are licensed and made available under the terms and conditions of the BSD License\r
	270	# which accompanies this distribution. The full text of the license may be found at\r
	271	# http://opensource.org/licenses/bsd-license.php\r
	272	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	273	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	274	#\r
	275	#\r
	276	#**/\r
	277	\r
80408db0	278	[Defines]\r
	279	INF_VERSION = 0x00010005\r
	280	BASE_NAME = PcdPeim\r
	281	FILE_GUID = 9B3ADA4F-AE56-4c24-8DEA-F03B7558AE50\r
	282	MODULE_TYPE = PEIM\r
	283	VERSION_STRING = 1.0\r
be82f9ff	284	PCD_IS_DRIVER = PEI_PCD_DRIVER\r
80408db0	285	ENTRY_POINT = PcdPeimInit\r
	286	\r
	287	#\r
	288	# The following information is for reference only and not required by the build tools.\r
	289	#\r
078bee4e	290	# VALID_ARCHITECTURES = IA32 X64 IPF EBC (EBC is for build only)\r
80408db0	291	#\r
80408db0	292	\r
80408db0	293	[Sources.common]\r
	294	Service.c\r
	295	Service.h\r
	296	Pcd.c\r
80408db0	297	\r
80408db0	298	[Packages]\r
80408db0	299	MdePkg/MdePkg.dec\r
e75fe0eb	300	MdeModulePkg/MdeModulePkg.dec\r
80408db0	301	\r
	302	[LibraryClasses]\r
	303	BaseMemoryLib\r
80408db0	304	PcdLib\r
	305	PeiServicesLib\r
	306	HobLib\r
	307	BaseLib\r
	308	PeimEntryPoint\r
	309	DebugLib\r
	310	\r
80408db0	311	[Guids]\r
b9982883 LG	312	gPcdDataBaseHobGuid ## PRODUCES ## Hob\r
b9982883 LG	313	gPcdDataBaseHobGuid ## CONSUMES ## Hob\r
80408db0	314	\r
80408db0	315	[Ppis]\r
b9982883 LG	316	gEfiPeiReadOnlyVariable2PpiGuid ## CONSUMES\r
b9982883 LG	317	gPcdPpiGuid ## PRODUCES\r
80408db0	318	\r
4941d881	319	[FeaturePcd]\r
f806dd27	320	gEfiMdeModulePkgTokenSpaceGuid.PcdPeiFullPcdDatabaseEnable\r
80408db0	321	\r
4941d881	322	[FixedPcd]\r
b3af5df6	323	gEfiMdeModulePkgTokenSpaceGuid.PcdVpdBaseAddress\r
f806dd27	324	gEfiMdeModulePkgTokenSpaceGuid.PcdMaxPeiPcdCallBackNumberPerPcdEntry \|\| PcdPeiFullPcdDatabaseEnable\r
80408db0	325	\r
80408db0	326	[Depex]\r
	327	TRUE\r
	328	\r