Re: [edk2-devel] [PATCH 1/2] MdePkg: Standalone PCD driver

["Ni, Ray" <ray.ni@intel.com>]

Mike,
In payload phase, there are two kinds of payloads:
1. the universal payloads that conform to universal payload spec. These payloads cannot depend on any PCD produced from bootloader phase.
2. the platform payloads. These payloads are developed by the same vendor as the bootloader. So, they can depend on the PCD produced by the bootloader. The ultimate goal is these platform payloads can be eliminated.

Thanks,
Ray

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Michael D Kinney
> Sent: Tuesday, May 25, 2021 4:30 AM
> To: devel@edk2.groups.io; Liu, Zhiguang <zhiguang.liu@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Subject: Re: [edk2-devel] [PATCH 1/2] MdePkg: Standalone PCD driver
> 
> Why do we need a new PCD?
> 
> Can't we make this the default behavior to only install one instance?
> 
> Thanks,
> 
> Mike
> 
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Zhiguang Liu
> > Sent: Monday, May 24, 2021 2:25 AM
> > To: devel@edk2.groups.io
> > Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Liming Gao <gaoliming@byosoft.com.cn>
> > Subject: [edk2-devel] [PATCH 1/2] MdePkg: Standalone PCD driver
> >
> > Add a feature PCD to control if the PCD driver is build as standalone mode.
> > This way, two mode PCD driver won't share the data base.
> >
> > Cc: Michael D Kinney <michael.d.kinney@intel.com>
> > Cc: Liming Gao <gaoliming@byosoft.com.cn>
> > Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
> > ---
> >  MdeModulePkg/Universal/PCD/Dxe/Pcd.c       | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++---------------
> -------
> > --
> >  MdeModulePkg/Universal/PCD/Dxe/Pcd.inf     | 16 ++++++++++++----
> >  MdeModulePkg/Universal/PCD/Dxe/Service.c   |  7 ++++++-
> >  MdePkg/Include/Protocol/Pcd.h              |  5 -----
> >  MdePkg/Include/Protocol/PcdInfo.h          |  5 -----
> >  MdePkg/Library/DxePcdLib/DxePcdLib.c       | 24 ++++++++++++++++++++----
> >  MdePkg/Library/DxePcdLib/DxePcdLib.inf     | 16 ++++++++++++----
> >  MdePkg/Library/DxePcdLib/PayloadPcdLib.inf | 71
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  MdePkg/MdePkg.dec                          | 12 ++++++++++++
> >  9 files changed, 184 insertions(+), 47 deletions(-)
> >
> > diff --git a/MdeModulePkg/Universal/PCD/Dxe/Pcd.c b/MdeModulePkg/Universal/PCD/Dxe/Pcd.c
> > index cdb9b4fac1..dc9c4be022 100644
> > --- a/MdeModulePkg/Universal/PCD/Dxe/Pcd.c
> > +++ b/MdeModulePkg/Universal/PCD/Dxe/Pcd.c
> > @@ -129,34 +129,61 @@ PcdDxeInit (
> >    //
> >
> >    // Make sure the Pcd Protocol is not already installed in the system
> >
> >    //
> >
> > +  if (FeaturePcdGet (PcdStandalonePcdDatabaseEnable)) {
> >
> > +    ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEdkiiPayloadStandalonePcdProtocolGuid);
> >
> > +    BuildPcdDxeDataBase ();
> >
> >
> >
> > -  ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gPcdProtocolGuid);
> >
> > +    //
> >
> > +    // Install PCD_PROTOCOL to handle dynamic type PCD
> >
> > +    // Install EFI_PCD_PROTOCOL to handle dynamicEx type PCD
> >
> > +    //
> >
> > +    Status = gBS->InstallMultipleProtocolInterfaces (
> >
> > +                    &mPcdHandle,
> >
> > +                    &gEdkiiPayloadStandalonePcdProtocolGuid,     &mPcdInstance,
> >
> > +                    &gEdkiiEfiPayloadStandalonePcdProtocolGuid,  &mEfiPcdInstance,
> >
> > +                    NULL
> >
> > +                    );
> >
> > +    ASSERT_EFI_ERROR (Status);
> >
> >
> >
> > -  BuildPcdDxeDataBase ();
> >
> > +    //
> >
> > +    // Install GET_PCD_INFO_PROTOCOL to handle dynamic type PCD
> >
> > +    // Install EFI_GET_PCD_INFO_PROTOCOL to handle dynamicEx type PCD
> >
> > +    //
> >
> > +    Status = gBS->InstallMultipleProtocolInterfaces (
> >
> > +                    &mPcdHandle,
> >
> > +                    &gEdkiiPayloadGetStandalonePcdInfoProtocolGuid,     &mGetPcdInfoInstance,
> >
> > +                    &gEdkiiEfiPayloadGetStandalonePcdInfoProtocolGuid,  &mEfiGetPcdInfoInstance,
> >
> > +                    NULL
> >
> > +                    );
> >
> > +    ASSERT_EFI_ERROR (Status);
> >
> > +  } else {
> >
> > +    ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gPcdProtocolGuid);
> >
> > +    BuildPcdDxeDataBase ();
> >
> >
> >
> > -  //
> >
> > -  // Install PCD_PROTOCOL to handle dynamic type PCD
> >
> > -  // Install EFI_PCD_PROTOCOL to handle dynamicEx type PCD
> >
> > -  //
> >
> > -  Status = gBS->InstallMultipleProtocolInterfaces (
> >
> > -                  &mPcdHandle,
> >
> > -                  &gPcdProtocolGuid,     &mPcdInstance,
> >
> > -                  &gEfiPcdProtocolGuid,  &mEfiPcdInstance,
> >
> > -                  NULL
> >
> > -                  );
> >
> > -  ASSERT_EFI_ERROR (Status);
> >
> > +    //
> >
> > +    // Install PCD_PROTOCOL to handle dynamic type PCD
> >
> > +    // Install EFI_PCD_PROTOCOL to handle dynamicEx type PCD
> >
> > +    //
> >
> > +    Status = gBS->InstallMultipleProtocolInterfaces (
> >
> > +                    &mPcdHandle,
> >
> > +                    &gPcdProtocolGuid,     &mPcdInstance,
> >
> > +                    &gEfiPcdProtocolGuid,  &mEfiPcdInstance,
> >
> > +                    NULL
> >
> > +                    );
> >
> > +    ASSERT_EFI_ERROR (Status);
> >
> >
> >
> > -  //
> >
> > -  // Install GET_PCD_INFO_PROTOCOL to handle dynamic type PCD
> >
> > -  // Install EFI_GET_PCD_INFO_PROTOCOL to handle dynamicEx type PCD
> >
> > -  //
> >
> > -  Status = gBS->InstallMultipleProtocolInterfaces (
> >
> > -                  &mPcdHandle,
> >
> > -                  &gGetPcdInfoProtocolGuid,     &mGetPcdInfoInstance,
> >
> > -                  &gEfiGetPcdInfoProtocolGuid,  &mEfiGetPcdInfoInstance,
> >
> > -                  NULL
> >
> > -                  );
> >
> > -  ASSERT_EFI_ERROR (Status);
> >
> > +    //
> >
> > +    // Install GET_PCD_INFO_PROTOCOL to handle dynamic type PCD
> >
> > +    // Install EFI_GET_PCD_INFO_PROTOCOL to handle dynamicEx type PCD
> >
> > +    //
> >
> > +    Status = gBS->InstallMultipleProtocolInterfaces (
> >
> > +                    &mPcdHandle,
> >
> > +                    &gGetPcdInfoProtocolGuid,     &mGetPcdInfoInstance,
> >
> > +                    &gEfiGetPcdInfoProtocolGuid,  &mEfiGetPcdInfoInstance,
> >
> > +                    NULL
> >
> > +                    );
> >
> > +    ASSERT_EFI_ERROR (Status);
> >
> > +  }
> >
> >
> >
> >    //
> >
> >    // Register callback function upon VariableLockProtocol
> >
> > diff --git a/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf b/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf
> > index eb9f757f14..f3e704f083 100644
> > --- a/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf
> > +++ b/MdeModulePkg/Universal/PCD/Dxe/Pcd.inf
> > @@ -329,10 +329,15 @@
> >    gEfiMdeModulePkgTokenSpaceGuid                ## SOMETIMES_CONSUMES  ## GUID
> >
> >
> >
> >  [Protocols]
> >
> > -  gPcdProtocolGuid                              ## PRODUCES
> >
> > -  gEfiPcdProtocolGuid                           ## PRODUCES
> >
> > -  gGetPcdInfoProtocolGuid                       ## SOMETIMES_PRODUCES
> >
> > -  gEfiGetPcdInfoProtocolGuid                    ## SOMETIMES_PRODUCES
> >
> > +  gPcdProtocolGuid                                 ## PRODUCES
> >
> > +  gEfiPcdProtocolGuid                              ## PRODUCES
> >
> > +  gGetPcdInfoProtocolGuid                          ## SOMETIMES_PRODUCES
> >
> > +  gEfiGetPcdInfoProtocolGuid                       ## SOMETIMES_PRODUCES
> >
> > +
> >
> > +  gEdkiiPayloadStandalonePcdProtocolGuid           ## PRODUCES
> >
> > +  gEdkiiEfiPayloadStandalonePcdProtocolGuid        ## PRODUCES
> >
> > +  gEdkiiPayloadGetStandalonePcdInfoProtocolGuid    ## SOMETIMES_PRODUCES
> >
> > +  gEdkiiEfiPayloadGetStandalonePcdInfoProtocolGuid ## SOMETIMES_PRODUCES
> >
> >    ## NOTIFY
> >
> >    ## SOMETIMES_CONSUMES
> >
> >    gEdkiiVariableLockProtocolGuid
> >
> > @@ -342,6 +347,9 @@
> >    gEfiMdeModulePkgTokenSpaceGuid.PcdVpdBaseAddress64    ## SOMETIMES_CONSUMES
> >
> >    gEfiMdeModulePkgTokenSpaceGuid.PcdSetNvStoreDefaultId ## SOMETIMES_CONSUMES
> >
> >
> >
> > +[FeaturePcd]
> >
> > +  gEfiMdePkgTokenSpaceGuid.PcdStandalonePcdDatabaseEnable ## CONSUMES
> >
> > +
> >
> >  [Depex]
> >
> >    TRUE
> >
> >
> >
> > diff --git a/MdeModulePkg/Universal/PCD/Dxe/Service.c b/MdeModulePkg/Universal/PCD/Dxe/Service.c
> > index ea7edc3cbb..fe16ba713b 100644
> > --- a/MdeModulePkg/Universal/PCD/Dxe/Service.c
> > +++ b/MdeModulePkg/Universal/PCD/Dxe/Service.c
> > @@ -861,7 +861,12 @@ BuildPcdDxeDataBase (
> >    CopyMem (PcdDxeDb, mPcdDatabase.DxeDb, mPcdDatabase.DxeDb->Length);
> >
> >    mPcdDatabase.DxeDb = PcdDxeDb;
> >
> >
> >
> > -  GuidHob = GetFirstGuidHob (&gPcdDataBaseHobGuid);
> >
> > +  if (FeaturePcdGet (PcdStandalonePcdDatabaseEnable)) {
> >
> > +    GuidHob = NULL;
> >
> > +  } else {
> >
> > +    GuidHob = GetFirstGuidHob (&gPcdDataBaseHobGuid);
> >
> > +  }
> >
> > +
> >
> >    if (GuidHob != NULL) {
> >
> >
> >
> >      //
> >
> > diff --git a/MdePkg/Include/Protocol/Pcd.h b/MdePkg/Include/Protocol/Pcd.h
> > index 9cd1a998f8..cfa6ac2360 100644
> > --- a/MdePkg/Include/Protocol/Pcd.h
> > +++ b/MdePkg/Include/Protocol/Pcd.h
> > @@ -17,11 +17,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
> >  #ifndef __PCD_H__
> >
> >  #define __PCD_H__
> >
> >
> >
> > -extern EFI_GUID gPcdProtocolGuid;
> >
> > -
> >
> > -#define PCD_PROTOCOL_GUID \
> >
> > -  { 0x11b34006, 0xd85b, 0x4d0a, { 0xa2, 0x90, 0xd5, 0xa5, 0x71, 0x31, 0xe, 0xf7 } }
> >
> > -
> >
> >  #define PCD_INVALID_TOKEN_NUMBER ((UINTN) 0)
> >
> >
> >
> >
> >
> > diff --git a/MdePkg/Include/Protocol/PcdInfo.h b/MdePkg/Include/Protocol/PcdInfo.h
> > index b0ec7f6770..5691215c42 100644
> > --- a/MdePkg/Include/Protocol/PcdInfo.h
> > +++ b/MdePkg/Include/Protocol/PcdInfo.h
> > @@ -19,11 +19,6 @@
> >  #ifndef __PCD_INFO_H__
> >
> >  #define __PCD_INFO_H__
> >
> >
> >
> > -extern EFI_GUID gGetPcdInfoProtocolGuid;
> >
> > -
> >
> > -#define GET_PCD_INFO_PROTOCOL_GUID \
> >
> > -  { 0x5be40f57, 0xfa68, 0x4610, { 0xbb, 0xbf, 0xe9, 0xc5, 0xfc, 0xda, 0xd3, 0x65 } }
> >
> > -
> >
> >  ///
> >
> >  /// The forward declaration for GET_PCD_INFO_PROTOCOL.
> >
> >  ///
> >
> > diff --git a/MdePkg/Library/DxePcdLib/DxePcdLib.c b/MdePkg/Library/DxePcdLib/DxePcdLib.c
> > index 2accaeda2c..8a61486832 100644
> > --- a/MdePkg/Library/DxePcdLib/DxePcdLib.c
> > +++ b/MdePkg/Library/DxePcdLib/DxePcdLib.c
> > @@ -43,7 +43,11 @@ GetPiPcdProtocol (
> >      // PI Pcd protocol defined in PI 1.2 vol3 should be installed before the module
> >
> >      // access DynamicEx type PCD.
> >
> >      //
> >
> > -    Status = gBS->LocateProtocol (&gEfiPcdProtocolGuid, NULL, (VOID **) &mPiPcd);
> >
> > +    if (FeaturePcdGet (PcdStandalonePcdDatabaseEnable)) {
> >
> > +      Status = gBS->LocateProtocol (&gEdkiiEfiPayloadStandalonePcdProtocolGuid, NULL, (VOID **) &mPiPcd);
> >
> > +    } else {
> >
> > +      Status = gBS->LocateProtocol (&gEfiPcdProtocolGuid, NULL, (VOID **) &mPiPcd);
> >
> > +    }
> >
> >      ASSERT_EFI_ERROR (Status);
> >
> >      ASSERT (mPiPcd != NULL);
> >
> >    }
> >
> > @@ -68,7 +72,11 @@ GetPcdProtocol (
> >      // PCD protocol need to be installed before the module access Dynamic type PCD.
> >
> >      // But dynamic type PCD is not required in PI 1.2 specification.
> >
> >      //
> >
> > -    Status = gBS->LocateProtocol (&gPcdProtocolGuid, NULL, (VOID **)&mPcd);
> >
> > +    if (FeaturePcdGet (PcdStandalonePcdDatabaseEnable)) {
> >
> > +      Status = gBS->LocateProtocol (&gEdkiiPayloadStandalonePcdProtocolGuid, NULL, (VOID **)&mPcd);
> >
> > +    } else {
> >
> > +      Status = gBS->LocateProtocol (&gPcdProtocolGuid, NULL, (VOID **)&mPcd);
> >
> > +    }
> >
> >      ASSERT_EFI_ERROR (Status);
> >
> >      ASSERT (mPcd != NULL);
> >
> >    }
> >
> > @@ -88,7 +96,11 @@ GetPiPcdInfoProtocolPointer (
> >    EFI_STATUS  Status;
> >
> >
> >
> >    if (mPiPcdInfo == NULL) {
> >
> > -    Status = gBS->LocateProtocol (&gEfiGetPcdInfoProtocolGuid, NULL, (VOID **)&mPiPcdInfo);
> >
> > +    if (FeaturePcdGet (PcdStandalonePcdDatabaseEnable)) {
> >
> > +      Status = gBS->LocateProtocol (&gEdkiiEfiPayloadGetStandalonePcdInfoProtocolGuid, NULL, (VOID **)&mPiPcdInfo);
> >
> > +    } else{
> >
> > +      Status = gBS->LocateProtocol (&gEfiGetPcdInfoProtocolGuid, NULL, (VOID **)&mPiPcdInfo);
> >
> > +    }
> >
> >      ASSERT_EFI_ERROR (Status);
> >
> >      ASSERT (mPiPcdInfo != NULL);
> >
> >    }
> >
> > @@ -108,7 +120,11 @@ GetPcdInfoProtocolPointer (
> >    EFI_STATUS  Status;
> >
> >
> >
> >    if (mPcdInfo == NULL) {
> >
> > -    Status = gBS->LocateProtocol (&gGetPcdInfoProtocolGuid, NULL, (VOID **)&mPcdInfo);
> >
> > +    if (FeaturePcdGet (PcdStandalonePcdDatabaseEnable)) {
> >
> > +      Status = gBS->LocateProtocol (&gEdkiiPayloadGetStandalonePcdInfoProtocolGuid, NULL, (VOID **)&mPcdInfo);
> >
> > +    } else {
> >
> > +      Status = gBS->LocateProtocol (&gGetPcdInfoProtocolGuid, NULL, (VOID **)&mPcdInfo);
> >
> > +    }
> >
> >      ASSERT_EFI_ERROR (Status);
> >
> >      ASSERT (mPcdInfo != NULL);
> >
> >    }
> >
> > diff --git a/MdePkg/Library/DxePcdLib/DxePcdLib.inf b/MdePkg/Library/DxePcdLib/DxePcdLib.inf
> > index 3d4d21b442..59d9fe4f11 100644
> > --- a/MdePkg/Library/DxePcdLib/DxePcdLib.inf
> > +++ b/MdePkg/Library/DxePcdLib/DxePcdLib.inf
> > @@ -53,10 +53,18 @@
> >
> >
> >
> >
> >  [Protocols]
> >
> > -  gPcdProtocolGuid                              ## SOMETIMES_CONSUMES
> >
> > -  gEfiPcdProtocolGuid                           ## CONSUMES
> >
> > -  gGetPcdInfoProtocolGuid                       ## SOMETIMES_CONSUMES
> >
> > -  gEfiGetPcdInfoProtocolGuid                    ## SOMETIMES_CONSUMES
> >
> > +  gPcdProtocolGuid                                 ## SOMETIMES_CONSUMES
> >
> > +  gEfiPcdProtocolGuid                              ## SOMETIMES_CONSUMES
> >
> > +  gGetPcdInfoProtocolGuid                          ## SOMETIMES_CONSUMES
> >
> > +  gEfiGetPcdInfoProtocolGuid                       ## SOMETIMES_CONSUMES
> >
> > +
> >
> > +  gEdkiiPayloadStandalonePcdProtocolGuid           ## SOMETIMES_CONSUMES
> >
> > +  gEdkiiEfiPayloadStandalonePcdProtocolGuid        ## SOMETIMES_CONSUMES
> >
> > +  gEdkiiPayloadGetStandalonePcdInfoProtocolGuid    ## SOMETIMES_CONSUMES
> >
> > +  gEdkiiEfiPayloadGetStandalonePcdInfoProtocolGuid ## SOMETIMES_CONSUMES
> >
> > +
> >
> > +[FeaturePcd]
> >
> > +  gEfiMdePkgTokenSpaceGuid.PcdStandalonePcdDatabaseEnable ## CONSUMES
> >
> >
> >
> >  [Depex.common.DXE_DRIVER, Depex.common.DXE_RUNTIME_DRIVER, Depex.common.DXE_SAL_DRIVER,
> Depex.common.DXE_SMM_DRIVER]
> >
> >    gEfiPcdProtocolGuid
> >
> > diff --git a/MdePkg/Library/DxePcdLib/PayloadPcdLib.inf b/MdePkg/Library/DxePcdLib/PayloadPcdLib.inf
> > new file mode 100644
> > index 0000000000..e61296e11a
> > --- /dev/null
> > +++ b/MdePkg/Library/DxePcdLib/PayloadPcdLib.inf
> > @@ -0,0 +1,71 @@
> > +## @file
> >
> > +# Instance of PCD Library using PCD Protocol.
> >
> > +#
> >
> > +# There are two PCD protocols as follows:
> >
> > +#   1) PCD_PROTOCOL
> >
> > +#      It is EDKII implementation which support Dynamic/DynamicEx Pcds.
> >
> > +#   2) EFI_PCD_PROTOCOL
> >
> > +#      It is defined by PI specification 1.2, Vol 3 which only support dynamicEx
> >
> > +#      type Pcd.
> >
> > +#
> >
> > +# For dynamicEx type PCD, it is compatible between PCD_PROTOCOL and EFI_PCD_PROTOCOL.
> >
> > +#
> >
> > +# This library instance uses the PCD_PROTOCOL to handle dynamic PCD request and use
> >
> > +# EFI_PCD_PROTOCOL to handle dynamicEx type PCD.
> >
> > +#
> >
> > +# Note: A driver of type DXE_RUNTIME_DRIVER and DXE_SMM_DRIVER can only use this DxePcdLib
> >
> > +#  in their initialization without any issues to access Dynamic and DynamicEx PCD. They can't
> >
> > +#  access Dynamic and DynamicEx PCD in the implementation of runtime services and SMI handlers.
> >
> > +#  Because EFI_PCD_PROTOCOL is DXE protocol that is not available in OS runtime phase.
> >
> > +#
> >
> > +# Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
> >
> > +#
> >
> > +#  SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#
> >
> > +##
> >
> > +
> >
> > +[Defines]
> >
> > +  INF_VERSION                    = 0x00010005
> >
> > +  BASE_NAME                      = DxePcdLib
> >
> > +  MODULE_UNI_FILE                = DxePcdLib.uni
> >
> > +  FILE_GUID                      = f9af2f38-09e2-4ff1-b661-5d1c19d9f75c
> >
> > +  MODULE_TYPE                    = DXE_DRIVER
> >
> > +  VERSION_STRING                 = 1.0
> >
> > +  LIBRARY_CLASS                  = PcdLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SMM_DRIVER SMM_CORE
> UEFI_APPLICATION
> > UEFI_DRIVER
> >
> > +
> >
> > +#
> >
> > +#  VALID_ARCHITECTURES           = IA32 X64 EBC
> >
> > +#
> >
> > +
> >
> > +[Sources]
> >
> > +  DxePcdLib.c
> >
> > +
> >
> > +
> >
> > +[Packages]
> >
> > +  MdePkg/MdePkg.dec
> >
> > +
> >
> > +
> >
> > +[LibraryClasses]
> >
> > +  BaseMemoryLib
> >
> > +  UefiBootServicesTableLib
> >
> > +  DebugLib
> >
> > +
> >
> > +
> >
> > +[Protocols]
> >
> > +  gPcdProtocolGuid                                 ## SOMETIMES_CONSUMES
> >
> > +  gEfiPcdProtocolGuid                              ## SOMETIMES_CONSUMES
> >
> > +  gGetPcdInfoProtocolGuid                          ## SOMETIMES_CONSUMES
> >
> > +  gEfiGetPcdInfoProtocolGuid                       ## SOMETIMES_CONSUMES
> >
> > +
> >
> > +  gEdkiiPayloadStandalonePcdProtocolGuid           ## SOMETIMES_CONSUMES
> >
> > +  gEdkiiEfiPayloadStandalonePcdProtocolGuid        ## SOMETIMES_CONSUMES
> >
> > +  gEdkiiPayloadGetStandalonePcdInfoProtocolGuid    ## SOMETIMES_CONSUMES
> >
> > +  gEdkiiEfiPayloadGetStandalonePcdInfoProtocolGuid ## SOMETIMES_CONSUMES
> >
> > +
> >
> > +[FeaturePcd]
> >
> > +  gEfiMdePkgTokenSpaceGuid.PcdStandalonePcdDatabaseEnable ## CONSUMES
> >
> > +
> >
> > +[Depex.common.DXE_DRIVER, Depex.common.DXE_RUNTIME_DRIVER, Depex.common.DXE_SAL_DRIVER,
> Depex.common.DXE_SMM_DRIVER]
> >
> > +  gEdkiiEfiPayloadStandalonePcdProtocolGuid
> >
> > +
> >
> > diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
> > index b49f88d8e1..44f60e2086 100644
> > --- a/MdePkg/MdePkg.dec
> > +++ b/MdePkg/MdePkg.dec
> > @@ -1000,6 +1000,12 @@
> >    ## Include/Protocol/PcdInfo.h
> >
> >    gGetPcdInfoProtocolGuid        = { 0x5be40f57, 0xfa68, 0x4610, { 0xbb, 0xbf, 0xe9, 0xc5, 0xfc, 0xda, 0xd3, 0x65 } }
> >
> >
> >
> > +  ## Payload Standalone Pcd Protocol
> >
> > +  gEdkiiPayloadStandalonePcdProtocolGuid            = {0x8ef6ff48, 0x2260, 0x5407, {0x0d, 0x18, 0x2e, 0x2c, 0xaa, 0x7d,
> > 0xc9, 0x1f}}
> >
> > +  gEdkiiEfiPayloadStandalonePcdProtocolGuid         = {0x7e50c422, 0xae76, 0xbdc9, {0x16, 0x66, 0xca, 0x67, 0x95, 0x04,
> > 0x4d, 0xea}}
> >
> > +  gEdkiiPayloadGetStandalonePcdInfoProtocolGuid     = {0xd7214c03, 0x27e0, 0x5b35, {0xd5, 0xb1, 0xeb, 0x1a, 0x50, 0x14,
> > 0x5e, 0x15}}
> >
> > +  gEdkiiEfiPayloadGetStandalonePcdInfoProtocolGuid  = {0x1039ecdf, 0x5908, 0xf76c, {0x51, 0xf9, 0xae, 0x09, 0xc5, 0xa9,
> > 0x68, 0x9e}}
> >
> > +
> >
> >    #
> >
> >    # Protocols defined in PI1.0.
> >
> >    #
> >
> > @@ -1945,6 +1951,12 @@
> >    # @Prompt Validate ORDERED_COLLECTION structure
> >
> >    gEfiMdePkgTokenSpaceGuid.PcdValidateOrderedCollection|FALSE|BOOLEAN|0x0000002a
> >
> >
> >
> > +  ## Indicates if the standalone PCD database is enabled for Payload.<BR><BR>
> >
> > +  #   TRUE  - Enable tandalone PCD database is enabled for Payload.<BR>
> >
> > +  #   FALSE - Disable tandalone PCD database is enabled for Payload.<BR>
> >
> > +  # @Prompt Enable tandalone PCD database is enabled for Payload.
> >
> > +  gEfiMdePkgTokenSpaceGuid.PcdStandalonePcdDatabaseEnable|FALSE|BOOLEAN|0x0000002e
> >
> > +
> >
> >  [PcdsFixedAtBuild]
> >
> >    ## Status code value for indicating a watchdog timer has expired.
> >
> >    # EFI_COMPUTING_UNIT_HOST_PROCESSOR | EFI_CU_HP_EC_TIMER_EXPIRED
> >
> > --
> > 2.30.0.windows.2
> >
> >
> >
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> >
> 
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>