Re: [edk2-platforms: PATCH v4] IntelFsp2Pkg: Support Multi-Phase SiInit and debug handlers.

["Nate DeSimone" <nathaniel.l.desimone@intel.com>]

Hi Chasel,

A few comments:

#1) FspApi.h

The references to the FSP/PI spec sections in the comments are a bit odd. None of the existing comments in FspApi.h make references to sections in specs. Particularly weird are these ones:

* See Section 11.10 Appendix A - Data Structures for the definition of EFI_STATUS_CODE_TYPE.
* See Section 11.10 Appendix A - Data Structures for the definition of EFI_STATUS_CODE_VALUE.

This is code... why not point the reader to PiStatusCode.h directly?

#2) FspApi.h

This seems overly verbose:

  @retval UINT32                    The return value will be passed back through the EAX register.
                                    The return value indicates the number of bytes actually written to
                                    the debug log. If the return value is less than MessageLength,
                                    an error occurred.

I think it can be shortened to:

  @retval UINT32                    The return value indicates the number of bytes actually written to
                                    the debug log. If the return value is less than MessageLength,
                                    an error occurred.

#3) Please rename FspSecCoreSS.inf to Fsp22SecCoreS.inf and FspApiEntrySS.nasm to Fsp22ApiEntryS.nasm

#4) Any reason why the entry points for FspSiliconInit() and NotifyPhase() are absent from FspApiEntrySS.nasm/Fsp22ApiEntry.nasm? Are we going to need 2 FspSecCoreS drivers now instead of 1? Not sure how that would work... only 1 SecCore is allowed per FV.

Thanks,
Nate

> -----Original Message-----
> From: Chiu, Chasel <chasel.chiu@intel.com>
> Sent: Thursday, May 7, 2020 6:29 PM
> To: devel@edk2.groups.io
> Cc: Ma, Maurice <maurice.ma@intel.com>; Desimone, Nathaniel L
> <nathaniel.l.desimone@intel.com>; Zeng, Star <star.zeng@intel.com>
> Subject: [edk2-platforms: PATCH v4] IntelFsp2Pkg: Support Multi-Phase SiInit
> and debug handlers.
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2698
> 
> To enhance FSP silicon initialization flexibility an optional Multi-Phase API is
> introduced and FSP header needs update for new API offset. Also new
> SecCore module created for FspMultiPhaseSiInit API
> 
> New ARCH_UPD introduced for enhancing FSP debug message flexibility now
> bootloader can pass its own debug handler function pointer and FSP will call
> the function to handle debug message.
> 
> Cc: Maurice Ma <maurice.ma@intel.com>
> Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
> Cc: Star Zeng <star.zeng@intel.com>
> Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
> ---
>  IntelFsp2Pkg/FspSecCore/SecFspApiChk.c                             |   6 +++---
>  IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/PlatformSecLibNull.c |  19
> ++++++++++++++++++-
>  IntelFsp2Pkg/FspSecCore/FspSecCoreSS.inf                           |  48
> ++++++++++++++++++++++++++++++++++++++++++++++++
>  IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryCommon.nasm                |   5
> ++++-
>  IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntrySS.nasm                    |  68
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++++++++++
>  IntelFsp2Pkg/Include/FspEas/FspApi.h                               | 124
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++++++--
>  IntelFsp2Pkg/Include/FspGlobalData.h                               |   3 ++-
>  IntelFsp2Pkg/Include/Guid/FspHeaderFile.h                          |  10 ++++++++--
>  IntelFsp2Pkg/Include/Library/FspSecPlatformLib.h                   |  16
> +++++++++++++++-
>  9 files changed, 288 insertions(+), 11 deletions(-)
> 
> diff --git a/IntelFsp2Pkg/FspSecCore/SecFspApiChk.c
> b/IntelFsp2Pkg/FspSecCore/SecFspApiChk.c
> index 8e0595fe9a..1334959005 100644
> --- a/IntelFsp2Pkg/FspSecCore/SecFspApiChk.c
> +++ b/IntelFsp2Pkg/FspSecCore/SecFspApiChk.c
> @@ -1,6 +1,6 @@
>  /** @file
> 
> -  Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2016 - 2020, Intel Corporation. All rights
> + reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -59,7 +59,7 @@ FspApiCallingCheck (
>          Status = EFI_UNSUPPORTED;
>        }
>      }
> -  } else if (ApiIdx == FspSiliconInitApiIndex) {
> +  } else if ((ApiIdx == FspSiliconInitApiIndex) || (ApiIdx ==
> + FspMultiPhaseSiInitApiIndex)) {
>      //
>      // FspSiliconInit check
>      //
> @@ -68,7 +68,7 @@ FspApiCallingCheck (
>      } else {
>        if (FspData->Signature != FSP_GLOBAL_DATA_SIGNATURE) {
>          Status = EFI_UNSUPPORTED;
> -      } else if (EFI_ERROR (FspUpdSignatureCheck (ApiIdx, ApiParam))) {
> +      } else if (EFI_ERROR (FspUpdSignatureCheck
> + (FspSiliconInitApiIndex, ApiParam))) {
>          Status = EFI_INVALID_PARAMETER;
>        }
>      }
> diff --git
> a/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/PlatformSecLibNull.c
> b/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/PlatformSecLibNull.c
> index f7945b5240..df8c5d121f 100644
> --- a/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/PlatformSecLibNull.c
> +++ b/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/PlatformSecLibNull.c
> @@ -1,7 +1,7 @@
>  /** @file
>    Null instance of Platform Sec Lib.
> 
> -  Copyright (c) 2014 - 2019, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2014 - 2020, Intel Corporation. All rights
> + reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -25,3 +25,20 @@ FspUpdSignatureCheck (  {
>    return EFI_SUCCESS;
>  }
> +
> +/**
> +  This function handles FspMultiPhaseSiInitApi.
> +
> +  @param[in]  ApiIdx           Internal index of the FSP API.
> +  @param[in]  ApiParam         Parameter of the FSP API.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +FspMultiPhaseSiInitApiHandler (
> +  IN UINT32   ApiIdx,
> +  IN VOID     *ApiParam
> +  )
> +{
> +  return EFI_SUCCESS;
> +}
> diff --git a/IntelFsp2Pkg/FspSecCore/FspSecCoreSS.inf
> b/IntelFsp2Pkg/FspSecCore/FspSecCoreSS.inf
> new file mode 100644
> index 0000000000..184101c7d3
> --- /dev/null
> +++ b/IntelFsp2Pkg/FspSecCore/FspSecCoreSS.inf
> @@ -0,0 +1,48 @@
> +## @file
> +#  Sec Core for FSP to support MultiPhase (SeparatePhase) SiInitialization.
> +#
> +#  Copyright (c) 2020, Intel Corporation. All rights reserved.<BR> # #
> +SPDX-License-Identifier: BSD-2-Clause-Patent # ##
> +
> +[Defines]
> +  INF_VERSION                    = 0x00010005
> +  BASE_NAME                      = FspSecCoreSS
> +  FILE_GUID                      = DF0FCD70-264A-40BF-BBD4-06C76DB19CB1
> +  MODULE_TYPE                    = SEC
> +  VERSION_STRING                 = 1.0
> +
> +#
> +# The following information is for reference only and not required by the
> build tools.
> +#
> +#  VALID_ARCHITECTURES           = IA32
> +#
> +
> +[Sources]
> +  SecFspApiChk.c
> +  SecFsp.h
> +
> +[Sources.IA32]
> +  Ia32/Stack.nasm
> +  Ia32/FspApiEntrySS.nasm
> +  Ia32/FspApiEntryCommon.nasm
> +  Ia32/FspHelper.nasm
> +
> +[Binaries.Ia32]
> +  RAW|Vtf0/Bin/ResetVec.ia32.raw |GCC
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  IntelFsp2Pkg/IntelFsp2Pkg.dec
> +
> +[LibraryClasses]
> +  BaseMemoryLib
> +  DebugLib
> +  BaseLib
> +  PciCf8Lib
> +  SerialPortLib
> +  FspSwitchStackLib
> +  FspCommonLib
> +  FspSecPlatformLib
> diff --git a/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryCommon.nasm
> b/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryCommon.nasm
> index bb4451b145..26ae7d9fd3 100644
> --- a/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryCommon.nasm
> +++ b/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntryCommon.nasm
> @@ -1,7 +1,7 @@
>  ;; @file
>  ;  Provide FSP API entry points.
>  ;
> -; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
> +; Copyright (c) 2016 - 2020, Intel Corporation. All rights
> +reserved.<BR>
>  ; SPDX-License-Identifier: BSD-2-Clause-Patent  ;;
> 
> @@ -62,6 +62,9 @@ FspApiCommon2:
>    cmp    eax, 3   ; FspMemoryInit API
>    jz     FspApiCommon3
> 
> +  cmp    eax, 6   ; FspMultiPhaseSiInitApiIndex API
> +  jz     FspApiCommon3
> +
>    call   ASM_PFX(AsmGetFspInfoHeader)
>    jmp    ASM_PFX(Loader2PeiSwitchStack)
> 
> diff --git a/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntrySS.nasm
> b/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntrySS.nasm
> new file mode 100644
> index 0000000000..e6956277a9
> --- /dev/null
> +++ b/IntelFsp2Pkg/FspSecCore/Ia32/FspApiEntrySS.nasm
> @@ -0,0 +1,68 @@
> +;; @file
> +;  Provide FSP API entry points.
> +;
> +; Copyright (c) 2020, Intel Corporation. All rights reserved.<BR> ;
> +SPDX-License-Identifier: BSD-2-Clause-Patent ;;
> +
> +    SECTION .text
> +
> +;
> +; Following functions will be provided in C ; extern
> +ASM_PFX(FspApiCommon) extern
> ASM_PFX(FspMultiPhaseSiInitApiHandler)
> +
> +;----------------------------------------------------------------------
> +------
> +; FspMultiPhaseSiInitApi API
> +;
> +; This FSP API provides multi-phase silicon initialization, which
> +brings greater ; modularity beyond the existing FspSiliconInit() API.
> +; Increased modularity is achieved by adding an extra API to FSP-S.
> +; This allows the bootloader to add board specific initialization steps
> +throughout ; the SiliconInit flow as needed.
> +;
> +;----------------------------------------------------------------------
> +------
> +global ASM_PFX(FspMultiPhaseSiInitApi)
> +ASM_PFX(FspMultiPhaseSiInitApi):
> +  mov    eax,  6 ; FSP_API_INDEX.FspMultiPhaseSiInitApiIndex
> +  jmp    ASM_PFX(FspApiCommon)
> +
> +;----------------------------------------------------------------------
> +------
> +; FspApiCommonContinue API
> +;
> +; This is the FSP API common entry point to resume the FSP execution ;
> +;----------------------------------------------------------------------
> +------
> +global ASM_PFX(FspApiCommonContinue)
> +ASM_PFX(FspApiCommonContinue):
> +  ;
> +  ; Handle FspMultiPhaseSiInitApiIndex API
> +  ;
> +  pushad
> +  push   DWORD [esp + (4 * 8 + 4)]  ; push ApiParam
> +  push   eax                ; push ApiIdx
> +  call   ASM_PFX(FspMultiPhaseSiInitApiHandler)
> +  add    esp, 8
> +  mov    dword  [esp + (4 * 7)], eax
> +  popad
> +  ret
> +
> +;----------------------------------------------------------------------
> +------
> +; TempRamInit API
> +;
> +; Empty function for WHOLEARCHIVE build option ;
> +;----------------------------------------------------------------------
> +------
> +global ASM_PFX(TempRamInitApi)
> +ASM_PFX(TempRamInitApi):
> +  jmp $
> +  ret
> +
> +;----------------------------------------------------------------------
> +------
> +; Module Entrypoint API
> +;----------------------------------------------------------------------
> +------
> +global ASM_PFX(_ModuleEntryPoint)
> +ASM_PFX(_ModuleEntryPoint):
> +  jmp $
> +
> diff --git a/IntelFsp2Pkg/Include/FspEas/FspApi.h
> b/IntelFsp2Pkg/Include/FspEas/FspApi.h
> index dcf489dbe6..ca908b0198 100644
> --- a/IntelFsp2Pkg/Include/FspEas/FspApi.h
> +++ b/IntelFsp2Pkg/Include/FspEas/FspApi.h
> @@ -2,7 +2,7 @@
>    Intel FSP API definition from Intel Firmware Support Package External
>    Architecture Specification v2.0.
> 
> -  Copyright (c) 2014 - 2019, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2014 - 2020, Intel Corporation. All rights
> + reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -10,6 +10,8 @@
>  #ifndef _FSP_API_H_
>  #define _FSP_API_H_
> 
> +#include <Pi/PiStatusCode.h>
> +
>  ///
>  /// FSP Reset Status code
>  /// These are defined in FSP EAS v2.0 section 11.2.2 - OEM Status Code @@ -
> 24,6 +26,60 @@
>  #define FSP_STATUS_RESET_REQUIRED_8            0x40000008
>  /// @}
> 
> +/*
> +  FSP may optionally include the capability of generating events messages to
> aid in the debugging of firmware issues.
> +  These events fall under three catagories: Error, Progress, and Debug.
> +The event reporting mechanism follows the
> +  status code services described in section 6 and 7 of the PI Specification v1.7
> Volume 3.
> +
> +  @param[in] Type                   Indicates the type of event being reported.
> +                                    See Section 11.10 Appendix A - Data Structures for the
> definition of EFI_STATUS_CODE_TYPE.
> +  @param[in] Value                  Describes the current status of a hardware or
> software entity.
> +                                    This includes information about the class and subclass that
> is used to classify the entity as well as an operation.
> +                                    For progress events, the operation is the current activity.
> For error events, it is the exception.
> +                                    For debug events, it is not defined at this time.
> +                                    See Section 11.10 Appendix A - Data Structures for the
> definition of EFI_STATUS_CODE_VALUE.
> +  @param[in] Instance               The enumeration of a hardware or software
> entity within the system.
> +                                    A system may contain multiple entities that match a
> class/subclass pairing. The instance differentiates between them.
> +                                    An instance of 0 indicates that instance information is
> unavailable, not meaningful, or not relevant.
> +                                    Valid instance numbers start with 1.
> +  @param[in] *CallerId              This parameter can be used to identify the
> sub-module within the FSP generating the event.
> +                                    This parameter may be NULL.
> +  @param[in] *Data                  This optional parameter may be used to pass
> additional data. The contents can have event-specific data.
> +                                    For example, the FSP provides a
> EFI_STATUS_CODE_STRING_DATA instance to this parameter when sending
> debug messages.
> +                                    This parameter is NULL when no additional data is
> provided.
> +
> +  @retval EFI_SUCCESS               The event was handled successfully.
> +  @retval EFI_INVALID_PARAMETER     Input parameters are invalid.
> +  @retval EFI_DEVICE_ERROR          The event handler failed.
> +*/
> +typedef
> +EFI_STATUS
> +(EFIAPI *FSP_EVENT_HANDLER) (
> +  IN          EFI_STATUS_CODE_TYPE   Type,
> +  IN          EFI_STATUS_CODE_VALUE  Value,
> +  IN          UINT32                 Instance,
> +  IN OPTIONAL EFI_GUID               *CallerId,
> +  IN OPTIONAL EFI_STATUS_CODE_DATA   *Data
> +  );
> +
> +/*
> +  Handler for FSP-T debug log messages, provided by the bootloader.
> +
> +  @param[in] DebugMessage           A pointer to the debug message to be
> written to the log.
> +  @param[in] MessageLength          Number of bytes to written to the debug
> log.
> +
> +  @retval UINT32                    The return value will be passed back through the
> EAX register.
> +                                    The return value indicates the number of bytes actually
> written to
> +                                    the debug log. If the return value is less than
> MessageLength,
> +                                    an error occurred.
> +*/
> +typedef
> +UINT32
> +(EFIAPI *FSP_DEBUG_HANDLER) (
> +  IN CHAR8*                 DebugMessage,
> +  IN UINT32                 MessageLength
> +  );
> +
>  #pragma pack(1)
>  ///
>  /// FSP_UPD_HEADER Configuration.
> @@ -77,7 +133,13 @@ typedef struct {
>    /// Current boot mode.
>    ///
>    UINT32                      BootMode;
> -  UINT8                       Reserved1[8];
> +  ///
> +  /// A function pointer of type FSP_EVENT_HANDLER.
> +  /// Optional event handler for the bootloader to be informed of events
> occurring during FSP execution.
> +  /// Refer to Section 8.5 for more details. This value is only valid if Revision is
> >= 2.
> +  ///
> +  FSP_EVENT_HANDLER           *FspEventHandler;
> +  UINT8                       Reserved1[4];
>  } FSPM_ARCH_UPD;
> 
>  ///
> @@ -147,6 +209,40 @@ typedef struct {
>    FSP_INIT_PHASE     Phase;
>  } NOTIFY_PHASE_PARAMS;
> 
> +///
> +/// Action definition for FspMultiPhaseSiInit API /// typedef enum {
> +  EnumMultiPhaseGetNumberOfPhases  = 0x0,
> +  EnumMultiPhaseExecutePhase       = 0x1
> +} FSP_MULTI_PHASE_ACTION;
> +
> +///
> +/// Data structure returned by FSP when bootloader calling ///
> +FspMultiPhaseSiInit API with action 0
> (EnumMultiPhaseGetNumberOfPhases)
> +/// typedef struct {
> +  UINT32                         NumberOfPhases;
> +  UINT32                         PhasesExecuted;
> +} FSP_MULTI_PHASE_GET_NUMBER_OF_PHASES_PARAMS;
> +
> +///
> +/// FspMultiPhaseSiInit function parameter.
> +///
> +/// For action 0 (EnumMultiPhaseGetNumberOfPhases):
> +///   - PhaseIndex must be 0.
> +///   - MultiPhaseParamPtr should point to an instance of
> FSP_MULTI_PHASE_GET_NUMBER_OF_PHASES_PARAMS.
> +///
> +/// For action 1 (EnumMultiPhaseExecutePhase):
> +///   - PhaseIndex will be the phase that will be executed by FSP.
> +///   - MultiPhaseParamPtr shall be NULL.
> +///
> +typedef struct {
> +  IN     FSP_MULTI_PHASE_ACTION  MultiPhaseAction;
> +  IN     UINT32                  PhaseIndex;
> +  IN OUT VOID                    *MultiPhaseParamPtr;
> +} FSP_MULTI_PHASE_PARAMS;
> +
>  #pragma pack()
> 
>  /**
> @@ -279,4 +375,28 @@ EFI_STATUS
>    IN  VOID    *FspsUpdDataPtr
>    );
> 
> +/**
> +  This FSP API is expeted to be called after FspSiliconInit but before
> FspNotifyPhase.
> +  This FSP API provides multi-phase silicon initialization; which
> +brings greater modularity
> +  beyond the existing FspSiliconInit() API. Increased modularity is
> +achieved by adding an
> +  extra API to FSP-S. This allows the bootloader to add board specific
> +initialization steps
> +  throughout the SiliconInit flow as needed.
> +
> +  @param[in,out] FSP_MULTI_PHASE_PARAMS   For action -
> EnumMultiPhaseGetNumberOfPhases:
> +                                            FSP_MULTI_PHASE_PARAMS->MultiPhaseParamPtr
> will contain
> +                                            how many phases supported by FSP.
> +                                          For action - EnumMultiPhaseExecutePhase:
> +                                            FSP_MULTI_PHASE_PARAMS->MultiPhaseParamPtr
> shall be NULL.
> +  @retval EFI_SUCCESS                     FSP execution environment was initialized
> successfully.
> +  @retval EFI_INVALID_PARAMETER           Input parameters are invalid.
> +  @retval EFI_UNSUPPORTED                 The FSP calling conditions were not
> met.
> +  @retval EFI_DEVICE_ERROR                FSP initialization failed.
> +  @retval FSP_STATUS_RESET_REQUIREDx      A reset is required. These
> status codes will not be returned during S3.
> +**/
> +typedef
> +EFI_STATUS
> +(EFIAPI *FSP_MULTI_PHASE_SI_INIT) (
> +  IN FSP_MULTI_PHASE_PARAMS     *MultiPhaseSiInitParamPtr
> +);
> +
>  #endif
> diff --git a/IntelFsp2Pkg/Include/FspGlobalData.h
> b/IntelFsp2Pkg/Include/FspGlobalData.h
> index 1896b0240a..02df8463ed 100644
> --- a/IntelFsp2Pkg/Include/FspGlobalData.h
> +++ b/IntelFsp2Pkg/Include/FspGlobalData.h
> @@ -1,6 +1,6 @@
>  /** @file
> 
> -  Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2014 - 2020, Intel Corporation. All rights
> + reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -22,6 +22,7 @@ typedef enum {
>    FspMemoryInitApiIndex,
>    TempRamExitApiIndex,
>    FspSiliconInitApiIndex,
> +  FspMultiPhaseSiInitApiIndex,
>    FspApiIndexMax
>  } FSP_API_INDEX;
> 
> diff --git a/IntelFsp2Pkg/Include/Guid/FspHeaderFile.h
> b/IntelFsp2Pkg/Include/Guid/FspHeaderFile.h
> index 16f43a1273..3474bac1de 100644
> --- a/IntelFsp2Pkg/Include/Guid/FspHeaderFile.h
> +++ b/IntelFsp2Pkg/Include/Guid/FspHeaderFile.h
> @@ -1,8 +1,8 @@
>  /** @file
>    Intel FSP Header File definition from Intel Firmware Support Package
> External
> -  Architecture Specification v2.0.
> +  Architecture Specification v2.0 and above.
> 
> -  Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2014 - 2020, Intel Corporation. All rights
> + reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -110,6 +110,12 @@ typedef struct {
>    /// Byte 0x44: The offset for the API to initialize the CPU and chipset.
>    ///
>    UINT32  FspSiliconInitEntryOffset;
> +  ///
> +  /// Byte 0x48: Offset for the API for the optional Multi-Phase processor
> and chipset initialization.
> +  ///            This value is only valid if FSP HeaderRevision is >= 5.
> +  ///            If the value is set to 0x00000000, then this API is not available in
> this component.
> +  ///
> +  UINT32  FspMultiPhaseSiInitEntryOffset;
>  } FSP_INFO_HEADER;
> 
>  ///
> diff --git a/IntelFsp2Pkg/Include/Library/FspSecPlatformLib.h
> b/IntelFsp2Pkg/Include/Library/FspSecPlatformLib.h
> index 4d01b5f6d9..51a0309aed 100644
> --- a/IntelFsp2Pkg/Include/Library/FspSecPlatformLib.h
> +++ b/IntelFsp2Pkg/Include/Library/FspSecPlatformLib.h
> @@ -1,6 +1,6 @@
>  /** @file
> 
> -  Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2015 - 2020, Intel Corporation. All rights
> + reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -79,4 +79,18 @@ FspUpdSignatureCheck (
>    IN VOID     *ApiParam
>    );
> 
> +/**
> +  This function handles FspMultiPhaseSiInitApi.
> +
> +  @param[in]  ApiIdx           Internal index of the FSP API.
> +  @param[in]  ApiParam         Parameter of the FSP API.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +FspMultiPhaseSiInitApiHandler (
> +  IN UINT32   ApiIdx,
> +  IN VOID     *ApiParam
> +  );
> +
>  #endif
> --
> 2.13.3.windows.1