Re: [PATCH v2 12/17] MdeModulePkg: implement NULL instance of HobLib library class

["Zeng, Star" <star.zeng@intel.com>]

On 2019/1/14 21:27, Ard Biesheuvel wrote:
> In order to permit MM_STANDALONE modules to be built without relying
> on StandaloneMmPkg, provide a BASE type NULL implementation of HobLib.
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Reviewed-by: Star Zeng <star.zeng@intel.com>

> ---
>   MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.inf |  38 ++
>   MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.c   | 542 ++++++++++++++++++++
>   MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.uni |  20 +
>   3 files changed, 600 insertions(+)
> 
> diff --git a/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.inf b/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.inf
> new file mode 100644
> index 000000000000..c0e927ff14be
> --- /dev/null
> +++ b/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.inf
> @@ -0,0 +1,38 @@
> +## @file
> +# Null instance of HOB Library.
> +#
> +# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
> +# Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
> +#
> +#  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.
> +#
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x0001001B
> +  BASE_NAME                      = BaseHobLibNull
> +  MODULE_UNI_FILE                = BaseHobLibNull.uni
> +  FILE_GUID                      = a89dea6f-c9a0-40be-903c-7cac2ef8a0e7
> +  MODULE_TYPE                    = BASE
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = HobLib
> +
> +
> +#
> +#  VALID_ARCHITECTURES           = IA32 X64 ARM AARCH64
> +#
> +
> +[Sources]
> +  BaseHobLibNull.c
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +
> +[LibraryClasses]
> +  DebugLib
> diff --git a/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.c b/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.c
> new file mode 100644
> index 000000000000..0ea7d9304e9d
> --- /dev/null
> +++ b/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.c
> @@ -0,0 +1,542 @@
> +/** @file
> +  Provide Hob Library functions for build testing only.
> +
> +Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
> +Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
> +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.
> +
> +**/
> +
> +#include <Uefi.h>
> +#include <Pi/PiMultiPhase.h>
> +
> +#include <Library/DebugLib.h>
> +#include <Library/HobLib.h>
> +
> +/**
> +  Returns the pointer to the HOB list.
> +
> +  This function returns the pointer to first HOB in the list.
> +  For PEI phase, the PEI service GetHobList() can be used to retrieve the pointer
> +  to the HOB list.  For the DXE phase, the HOB list pointer can be retrieved through
> +  the EFI System Table by looking up theHOB list GUID in the System Configuration Table.
> +  Since the System Configuration Table does not exist that the time the DXE Core is
> +  launched, the DXE Core uses a global variable from the DXE Core Entry Point Library
> +  to manage the pointer to the HOB list.
> +
> +  If the pointer to the HOB list is NULL, then ASSERT().
> +
> +  @return The pointer to the HOB list.
> +
> +**/
> +VOID *
> +EFIAPI
> +GetHobList (
> +  VOID
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Returns the next instance of a HOB type from the starting HOB.
> +
> +  This function searches the first instance of a HOB type from the starting HOB pointer.
> +  If there does not exist such HOB type from the starting HOB pointer, it will return NULL.
> +  In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer
> +  unconditionally: it returns HobStart back if HobStart itself meets the requirement;
> +  caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.
> +
> +  If HobStart is NULL, then ASSERT().
> +
> +  @param  Type          The HOB type to return.
> +  @param  HobStart      The starting HOB pointer to search from.
> +
> +  @return The next instance of a HOB type from the starting HOB.
> +
> +**/
> +VOID *
> +EFIAPI
> +GetNextHob (
> +  IN UINT16                 Type,
> +  IN CONST VOID             *HobStart
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Returns the first instance of a HOB type among the whole HOB list.
> +
> +  This function searches the first instance of a HOB type among the whole HOB list.
> +  If there does not exist such HOB type in the HOB list, it will return NULL.
> +
> +  If the pointer to the HOB list is NULL, then ASSERT().
> +
> +  @param  Type          The HOB type to return.
> +
> +  @return The next instance of a HOB type from the starting HOB.
> +
> +**/
> +VOID *
> +EFIAPI
> +GetFirstHob (
> +  IN UINT16                 Type
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Returns the next instance of the matched GUID HOB from the starting HOB.
> +
> +  This function searches the first instance of a HOB from the starting HOB pointer.
> +  Such HOB should satisfy two conditions:
> +  its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid.
> +  If there does not exist such HOB from the starting HOB pointer, it will return NULL.
> +  Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()
> +  to extract the data section and its size information, respectively.
> +  In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer
> +  unconditionally: it returns HobStart back if HobStart itself meets the requirement;
> +  caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.
> +
> +  If Guid is NULL, then ASSERT().
> +  If HobStart is NULL, then ASSERT().
> +
> +  @param  Guid          The GUID to match with in the HOB list.
> +  @param  HobStart      A pointer to a Guid.
> +
> +  @return The next instance of the matched GUID HOB from the starting HOB.
> +
> +**/
> +VOID *
> +EFIAPI
> +GetNextGuidHob (
> +  IN CONST EFI_GUID         *Guid,
> +  IN CONST VOID             *HobStart
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Returns the first instance of the matched GUID HOB among the whole HOB list.
> +
> +  This function searches the first instance of a HOB among the whole HOB list.
> +  Such HOB should satisfy two conditions:
> +  its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid.
> +  If there does not exist such HOB from the starting HOB pointer, it will return NULL.
> +  Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()
> +  to extract the data section and its size information, respectively.
> +
> +  If the pointer to the HOB list is NULL, then ASSERT().
> +  If Guid is NULL, then ASSERT().
> +
> +  @param  Guid          The GUID to match with in the HOB list.
> +
> +  @return The first instance of the matched GUID HOB among the whole HOB list.
> +
> +**/
> +VOID *
> +EFIAPI
> +GetFirstGuidHob (
> +  IN CONST EFI_GUID         *Guid
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Get the system boot mode from the HOB list.
> +
> +  This function returns the system boot mode information from the
> +  PHIT HOB in HOB list.
> +
> +  If the pointer to the HOB list is NULL, then ASSERT().
> +
> +  @param  VOID.
> +
> +  @return The Boot Mode.
> +
> +**/
> +EFI_BOOT_MODE
> +EFIAPI
> +GetBootModeHob (
> +  VOID
> +  )
> +{
> +  ASSERT (FALSE);
> +  return MAX_UINT32;
> +}
> +
> +/**
> +  Builds a HOB for a loaded PE32 module.
> +
> +  This function builds a HOB for a loaded PE32 module.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If ModuleName is NULL, then ASSERT().
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  ModuleName              The GUID File Name of the module.
> +  @param  MemoryAllocationModule  The 64 bit physical address of the module.
> +  @param  ModuleLength            The length of the module in bytes.
> +  @param  EntryPoint              The 64 bit physical address of the module entry point.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildModuleHob (
> +  IN CONST EFI_GUID         *ModuleName,
> +  IN EFI_PHYSICAL_ADDRESS   MemoryAllocationModule,
> +  IN UINT64                 ModuleLength,
> +  IN EFI_PHYSICAL_ADDRESS   EntryPoint
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a HOB that describes a chunk of system memory with Owner GUID.
> +
> +  This function builds a HOB that describes a chunk of system memory.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  ResourceType        The type of resource described by this HOB.
> +  @param  ResourceAttribute   The resource attributes of the memory described by this HOB.
> +  @param  PhysicalStart       The 64 bit physical address of memory described by this HOB.
> +  @param  NumberOfBytes       The length of the memory described by this HOB in bytes.
> +  @param  OwnerGUID           GUID for the owner of this resource.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildResourceDescriptorWithOwnerHob (
> +  IN EFI_RESOURCE_TYPE            ResourceType,
> +  IN EFI_RESOURCE_ATTRIBUTE_TYPE  ResourceAttribute,
> +  IN EFI_PHYSICAL_ADDRESS         PhysicalStart,
> +  IN UINT64                       NumberOfBytes,
> +  IN EFI_GUID                     *OwnerGUID
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a HOB that describes a chunk of system memory.
> +
> +  This function builds a HOB that describes a chunk of system memory.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  ResourceType        The type of resource described by this HOB.
> +  @param  ResourceAttribute   The resource attributes of the memory described by this HOB.
> +  @param  PhysicalStart       The 64 bit physical address of memory described by this HOB.
> +  @param  NumberOfBytes       The length of the memory described by this HOB in bytes.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildResourceDescriptorHob (
> +  IN EFI_RESOURCE_TYPE            ResourceType,
> +  IN EFI_RESOURCE_ATTRIBUTE_TYPE  ResourceAttribute,
> +  IN EFI_PHYSICAL_ADDRESS         PhysicalStart,
> +  IN UINT64                       NumberOfBytes
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a customized HOB tagged with a GUID for identification and returns
> +  the start address of GUID HOB data.
> +
> +  This function builds a customized HOB tagged with a GUID for identification
> +  and returns the start address of GUID HOB data so that caller can fill the customized data.
> +  The HOB Header and Name field is already stripped.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If Guid is NULL, then ASSERT().
> +  If there is no additional space for HOB creation, then ASSERT().
> +  If DataLength > (0xFFF8 - sizeof (EFI_HOB_GUID_TYPE)), then ASSERT().
> +  HobLength is UINT16 and multiples of 8 bytes, so the max HobLength is 0xFFF8.
> +
> +  @param  Guid          The GUID to tag the customized HOB.
> +  @param  DataLength    The size of the data payload for the GUID HOB.
> +
> +  @retval  NULL         The GUID HOB could not be allocated.
> +  @retval  others       The start address of GUID HOB data.
> +
> +**/
> +VOID *
> +EFIAPI
> +BuildGuidHob (
> +  IN CONST EFI_GUID              *Guid,
> +  IN UINTN                       DataLength
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Builds a customized HOB tagged with a GUID for identification, copies the input data to the HOB
> +  data field, and returns the start address of the GUID HOB data.
> +
> +  This function builds a customized HOB tagged with a GUID for identification and copies the input
> +  data to the HOB data field and returns the start address of the GUID HOB data.  It can only be
> +  invoked during PEI phase; for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +  The HOB Header and Name field is already stripped.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If Guid is NULL, then ASSERT().
> +  If Data is NULL and DataLength > 0, then ASSERT().
> +  If there is no additional space for HOB creation, then ASSERT().
> +  If DataLength > (0xFFF8 - sizeof (EFI_HOB_GUID_TYPE)), then ASSERT().
> +  HobLength is UINT16 and multiples of 8 bytes, so the max HobLength is 0xFFF8.
> +
> +  @param  Guid          The GUID to tag the customized HOB.
> +  @param  Data          The data to be copied into the data field of the GUID HOB.
> +  @param  DataLength    The size of the data payload for the GUID HOB.
> +
> +  @retval  NULL         The GUID HOB could not be allocated.
> +  @retval  others       The start address of GUID HOB data.
> +
> +**/
> +VOID *
> +EFIAPI
> +BuildGuidDataHob (
> +  IN CONST EFI_GUID              *Guid,
> +  IN VOID                        *Data,
> +  IN UINTN                       DataLength
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Builds a Firmware Volume HOB.
> +
> +  This function builds a Firmware Volume HOB.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +  If the FvImage buffer is not at its required alignment, then ASSERT().
> +
> +  @param  BaseAddress   The base address of the Firmware Volume.
> +  @param  Length        The size of the Firmware Volume in bytes.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildFvHob (
> +  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN UINT64                      Length
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a EFI_HOB_TYPE_FV2 HOB.
> +
> +  This function builds a EFI_HOB_TYPE_FV2 HOB.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +  If the FvImage buffer is not at its required alignment, then ASSERT().
> +
> +  @param  BaseAddress   The base address of the Firmware Volume.
> +  @param  Length        The size of the Firmware Volume in bytes.
> +  @param  FvName        The name of the Firmware Volume.
> +  @param  FileName      The name of the file.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildFv2Hob (
> +  IN          EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN          UINT64                      Length,
> +  IN CONST    EFI_GUID                    *FvName,
> +  IN CONST    EFI_GUID                    *FileName
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a EFI_HOB_TYPE_FV3 HOB.
> +
> +  This function builds a EFI_HOB_TYPE_FV3 HOB.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +  If the FvImage buffer is not at its required alignment, then ASSERT().
> +
> +  @param BaseAddress            The base address of the Firmware Volume.
> +  @param Length                 The size of the Firmware Volume in bytes.
> +  @param AuthenticationStatus   The authentication status.
> +  @param ExtractedFv            TRUE if the FV was extracted as a file within
> +                                another firmware volume. FALSE otherwise.
> +  @param FvName                 The name of the Firmware Volume.
> +                                Valid only if IsExtractedFv is TRUE.
> +  @param FileName               The name of the file.
> +                                Valid only if IsExtractedFv is TRUE.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildFv3Hob (
> +  IN          EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN          UINT64                      Length,
> +  IN          UINT32                      AuthenticationStatus,
> +  IN          BOOLEAN                     ExtractedFv,
> +  IN CONST    EFI_GUID                    *FvName, OPTIONAL
> +  IN CONST    EFI_GUID                    *FileName OPTIONAL
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a Capsule Volume HOB.
> +
> +  This function builds a Capsule Volume HOB.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If the platform does not support Capsule Volume HOBs, then ASSERT().
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  BaseAddress   The base address of the Capsule Volume.
> +  @param  Length        The size of the Capsule Volume in bytes.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildCvHob (
> +  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN UINT64                      Length
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a HOB for the CPU.
> +
> +  This function builds a HOB for the CPU.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  SizeOfMemorySpace   The maximum physical memory addressability of the processor.
> +  @param  SizeOfIoSpace       The maximum physical I/O addressability of the processor.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildCpuHob (
> +  IN UINT8                       SizeOfMemorySpace,
> +  IN UINT8                       SizeOfIoSpace
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a HOB for the Stack.
> +
> +  This function builds a HOB for the stack.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  BaseAddress   The 64 bit physical address of the Stack.
> +  @param  Length        The length of the stack in bytes.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildStackHob (
> +  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN UINT64                      Length
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a HOB for the BSP store.
> +
> +  This function builds a HOB for BSP store.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  BaseAddress   The 64 bit physical address of the BSP.
> +  @param  Length        The length of the BSP store in bytes.
> +  @param  MemoryType    The type of memory allocated by this HOB.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildBspStoreHob (
> +  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN UINT64                      Length,
> +  IN EFI_MEMORY_TYPE             MemoryType
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Builds a HOB for the memory allocation.
> +
> +  This function builds a HOB for the memory allocation.
> +  It can only be invoked during PEI phase;
> +  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
> +
> +  If there is no additional space for HOB creation, then ASSERT().
> +
> +  @param  BaseAddress   The 64 bit physical address of the memory.
> +  @param  Length        The length of the memory allocation in bytes.
> +  @param  MemoryType    The type of memory allocated by this HOB.
> +
> +**/
> +VOID
> +EFIAPI
> +BuildMemoryAllocationHob (
> +  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
> +  IN UINT64                      Length,
> +  IN EFI_MEMORY_TYPE             MemoryType
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> diff --git a/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.uni b/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.uni
> new file mode 100644
> index 000000000000..4a999e381aa0
> --- /dev/null
> +++ b/MdeModulePkg/Library/BaseHobLibNull/BaseHobLibNull.uni
> @@ -0,0 +1,20 @@
> +// /** @file
> +// Null instance of HOB Library.
> +//
> +// Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
> +// Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
> +//
> +// 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.
> +//
> +// **/
> +
> +
> +#string STR_MODULE_ABSTRACT             #language en-US "Null instance of HOB Library"
> +
> +#string STR_MODULE_DESCRIPTION          #language en-US "HOB Library implementation for build testing only."
> +
>