Re: [PATCH v2 13/17] MdeModulePkg: implement NULL instance of MemoryAllocationLib 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
> MemoryAllocationLib.
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>   MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.inf |  38 ++
>   MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.c   | 575 ++++++++++++++++++++
>   MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.uni |  20 +
>   3 files changed, 633 insertions(+)
> 
> diff --git a/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.inf b/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.inf
> new file mode 100644
> index 000000000000..c231cd0e271b
> --- /dev/null
> +++ b/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.inf
> @@ -0,0 +1,38 @@
> +## @file
> +# Null instance of Memory Allocation Library.
> +#
> +# 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.
> +#
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x0001001B
> +  BASE_NAME                      = BaseMemoryAllocationLibNull
> +  MODULE_UNI_FILE                = BaseMemoryAllocationLibNull.uni
> +  FILE_GUID                      = fd56f5d6-f194-448f-be69-c0cbb0c281af
> +  MODULE_TYPE                    = BASE
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = MemoryAllocationLib
> +
> +
> +#
> +#  VALID_ARCHITECTURES           = IA32 X64 ARM AARCH64
> +#
> +
> +[Sources]
> +  BaseMemoryAllocationLibNull.c
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +
> +[LibraryClasses]
> +  DebugLib
> diff --git a/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.c b/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.c
> new file mode 100644
> index 000000000000..16812d3f9bb3
> --- /dev/null
> +++ b/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.c
> @@ -0,0 +1,575 @@
> +/** @file
> +  DUmmy support routines for memory allocation

Should be "Dummy" here?

With it handled, Reviewed-by: Star Zeng <star.zeng@intel.com>.

Thanks,
Star

> +
> +  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.
> +
> +**/
> +
> +
> +#include <Uefi/UefiBaseType.h>
> +
> +#include <Library/DebugLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +
> +
> +/**
> +  Allocates one or more 4KB pages of type EfiBootServicesData.
> +
> +  Allocates the number of 4KB pages of type EfiBootServicesData and returns a pointer to the
> +  allocated buffer.  The buffer returned is aligned on a 4KB boundary.  If Pages is 0, then NULL
> +  is returned.  If there is not enough memory remaining to satisfy the request, then NULL is
> +  returned.
> +
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocatePages (
> +  IN UINTN  Pages
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates one or more 4KB pages of type EfiRuntimeServicesData.
> +
> +  Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
> +  allocated buffer.  The buffer returned is aligned on a 4KB boundary.  If Pages is 0, then NULL
> +  is returned.  If there is not enough memory remaining to satisfy the request, then NULL is
> +  returned.
> +
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateRuntimePages (
> +  IN UINTN  Pages
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates one or more 4KB pages of type EfiReservedMemoryType.
> +
> +  Allocates the number of 4KB pages of type EfiReservedMemoryType and returns a pointer to the
> +  allocated buffer.  The buffer returned is aligned on a 4KB boundary.  If Pages is 0, then NULL
> +  is returned.  If there is not enough memory remaining to satisfy the request, then NULL is
> +  returned.
> +
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateReservedPages (
> +  IN UINTN  Pages
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Frees one or more 4KB pages that were previously allocated with one of the page allocation
> +  functions in the Memory Allocation Library.
> +
> +  Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer.  Buffer
> +  must have been allocated on a previous call to the page allocation services of the Memory
> +  Allocation Library.  If it is not possible to free allocated pages, then this function will
> +  perform no actions.
> +
> +  If Buffer was not allocated with a page allocation function in the Memory Allocation Library,
> +  then ASSERT().
> +  If Pages is zero, then ASSERT().
> +
> +  @param  Buffer                The pointer to the buffer of pages to free.
> +  @param  Pages                 The number of 4 KB pages to free.
> +
> +**/
> +VOID
> +EFIAPI
> +FreePages (
> +  IN VOID   *Buffer,
> +  IN UINTN  Pages
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Allocates one or more 4KB pages of type EfiBootServicesData at a specified alignment.
> +
> +  Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData with an
> +  alignment specified by Alignment.  The allocated buffer is returned.  If Pages is 0, then NULL is
> +  returned.  If there is not enough memory at the specified alignment remaining to satisfy the
> +  request, then NULL is returned.
> +
> +  If Alignment is not a power of two and Alignment is not zero, then ASSERT().
> +  If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().
> +
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +  @param  Alignment             The requested alignment of the allocation.
> +                                Must be a power of two.
> +                                If Alignment is zero, then byte alignment is used.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateAlignedPages (
> +  IN UINTN  Pages,
> +  IN UINTN  Alignment
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates one or more 4KB pages of type EfiRuntimeServicesData at a specified alignment.
> +
> +  Allocates the number of 4KB pages specified by Pages of type EfiRuntimeServicesData with an
> +  alignment specified by Alignment.  The allocated buffer is returned.  If Pages is 0, then NULL is
> +  returned.  If there is not enough memory at the specified alignment remaining to satisfy the
> +  request, then NULL is returned.
> +
> +  If Alignment is not a power of two and Alignment is not zero, then ASSERT().
> +  If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().
> +
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +  @param  Alignment             The requested alignment of the allocation.
> +                                Must be a power of two.
> +                                If Alignment is zero, then byte alignment is used.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateAlignedRuntimePages (
> +  IN UINTN  Pages,
> +  IN UINTN  Alignment
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates one or more 4KB pages of type EfiReservedMemoryType at a specified alignment.
> +
> +  Allocates the number of 4KB pages specified by Pages of type EfiReservedMemoryType with an
> +  alignment specified by Alignment.  The allocated buffer is returned.  If Pages is 0, then NULL is
> +  returned.  If there is not enough memory at the specified alignment remaining to satisfy the
> +  request, then NULL is returned.
> +
> +  If Alignment is not a power of two and Alignment is not zero, then ASSERT().
> +  If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().
> +
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +  @param  Alignment             The requested alignment of the allocation.
> +                                Must be a power of two.
> +                                If Alignment is zero, then byte alignment is used.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateAlignedReservedPages (
> +  IN UINTN  Pages,
> +  IN UINTN  Alignment
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Frees one or more 4KB pages that were previously allocated with one of the aligned page
> +  allocation functions in the Memory Allocation Library.
> +
> +  Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer.  Buffer
> +  must have been allocated on a previous call to the aligned page allocation services of the Memory
> +  Allocation Library.  If it is not possible to free allocated pages, then this function will
> +  perform no actions.
> +
> +  If Buffer was not allocated with an aligned page allocation function in the Memory Allocation
> +  Library, then ASSERT().
> +  If Pages is zero, then ASSERT().
> +
> +  @param  Buffer                The pointer to the buffer of pages to free.
> +  @param  Pages                 The number of 4 KB pages to free.
> +
> +**/
> +VOID
> +EFIAPI
> +FreeAlignedPages (
> +  IN VOID   *Buffer,
> +  IN UINTN  Pages
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Allocates a buffer of type EfiBootServicesData.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a
> +  pointer to the allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is
> +  returned.  If there is not enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  @param  AllocationSize        The number of bytes to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocatePool (
> +  IN UINTN  AllocationSize
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates a buffer of type EfiRuntimeServicesData.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData and returns
> +  a pointer to the allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is
> +  returned.  If there is not enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  @param  AllocationSize        The number of bytes to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateRuntimePool (
> +  IN UINTN  AllocationSize
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates a buffer of type EfiReservedMemoryType.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType and returns
> +  a pointer to the allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is
> +  returned.  If there is not enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  @param  AllocationSize        The number of bytes to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateReservedPool (
> +  IN UINTN  AllocationSize
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates and zeros a buffer of type EfiBootServicesData.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
> +  buffer with zeros, and returns a pointer to the allocated buffer.  If AllocationSize is 0, then a
> +  valid buffer of 0 size is returned.  If there is not enough memory remaining to satisfy the
> +  request, then NULL is returned.
> +
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateZeroPool (
> +  IN UINTN  AllocationSize
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates and zeros a buffer of type EfiRuntimeServicesData.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, clears the
> +  buffer with zeros, and returns a pointer to the allocated buffer.  If AllocationSize is 0, then a
> +  valid buffer of 0 size is returned.  If there is not enough memory remaining to satisfy the
> +  request, then NULL is returned.
> +
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateRuntimeZeroPool (
> +  IN UINTN  AllocationSize
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Allocates and zeros a buffer of type EfiReservedMemoryType.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, clears the
> +  buffer with zeros, and returns a pointer to the allocated buffer.  If AllocationSize is 0, then a
> +  valid buffer of 0 size is returned.  If there is not enough memory remaining to satisfy the
> +  request, then NULL is returned.
> +
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateReservedZeroPool (
> +  IN UINTN  AllocationSize
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Copies a buffer to an allocated buffer of type EfiBootServicesData.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, copies
> +  AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
> +  allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is returned.  If there
> +  is not enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  If Buffer is NULL, then ASSERT().
> +  If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
> +
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +  @param  Buffer                The buffer to copy to the allocated buffer.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateCopyPool (
> +  IN UINTN       AllocationSize,
> +  IN CONST VOID  *Buffer
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Copies a buffer to an allocated buffer of type EfiRuntimeServicesData.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, copies
> +  AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
> +  allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is returned.  If there
> +  is not enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  If Buffer is NULL, then ASSERT().
> +  If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
> +
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +  @param  Buffer                The buffer to copy to the allocated buffer.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateRuntimeCopyPool (
> +  IN UINTN       AllocationSize,
> +  IN CONST VOID  *Buffer
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Copies a buffer to an allocated buffer of type EfiReservedMemoryType.
> +
> +  Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, copies
> +  AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
> +  allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is returned.  If there
> +  is not enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  If Buffer is NULL, then ASSERT().
> +  If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
> +
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +  @param  Buffer                The buffer to copy to the allocated buffer.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +AllocateReservedCopyPool (
> +  IN UINTN       AllocationSize,
> +  IN CONST VOID  *Buffer
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Reallocates a buffer of type EfiBootServicesData.
> +
> +  Allocates and zeros the number bytes specified by NewSize from memory of type
> +  EfiBootServicesData.  If OldBuffer is not NULL, then the smaller of OldSize and
> +  NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
> +  OldBuffer is freed.  A pointer to the newly allocated buffer is returned.
> +  If NewSize is 0, then a valid buffer of 0 size is  returned.  If there is not
> +  enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
> +  is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
> +
> +  @param  OldSize        The size, in bytes, of OldBuffer.
> +  @param  NewSize        The size, in bytes, of the buffer to reallocate.
> +  @param  OldBuffer      The buffer to copy to the allocated buffer.  This is an optional
> +                         parameter that may be NULL.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +ReallocatePool (
> +  IN UINTN  OldSize,
> +  IN UINTN  NewSize,
> +  IN VOID   *OldBuffer  OPTIONAL
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Reallocates a buffer of type EfiRuntimeServicesData.
> +
> +  Allocates and zeros the number bytes specified by NewSize from memory of type
> +  EfiRuntimeServicesData.  If OldBuffer is not NULL, then the smaller of OldSize and
> +  NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
> +  OldBuffer is freed.  A pointer to the newly allocated buffer is returned.
> +  If NewSize is 0, then a valid buffer of 0 size is  returned.  If there is not
> +  enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
> +  is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
> +
> +  @param  OldSize        The size, in bytes, of OldBuffer.
> +  @param  NewSize        The size, in bytes, of the buffer to reallocate.
> +  @param  OldBuffer      The buffer to copy to the allocated buffer.  This is an optional
> +                         parameter that may be NULL.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +ReallocateRuntimePool (
> +  IN UINTN  OldSize,
> +  IN UINTN  NewSize,
> +  IN VOID   *OldBuffer  OPTIONAL
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Reallocates a buffer of type EfiReservedMemoryType.
> +
> +  Allocates and zeros the number bytes specified by NewSize from memory of type
> +  EfiReservedMemoryType.  If OldBuffer is not NULL, then the smaller of OldSize and
> +  NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
> +  OldBuffer is freed.  A pointer to the newly allocated buffer is returned.
> +  If NewSize is 0, then a valid buffer of 0 size is  returned.  If there is not
> +  enough memory remaining to satisfy the request, then NULL is returned.
> +
> +  If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
> +  is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
> +
> +  @param  OldSize        The size, in bytes, of OldBuffer.
> +  @param  NewSize        The size, in bytes, of the buffer to reallocate.
> +  @param  OldBuffer      The buffer to copy to the allocated buffer.  This is an
> +                         optional parameter that may be NULL.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +EFIAPI
> +ReallocateReservedPool (
> +  IN UINTN  OldSize,
> +  IN UINTN  NewSize,
> +  IN VOID   *OldBuffer  OPTIONAL
> +  )
> +{
> +  ASSERT (FALSE);
> +  return NULL;
> +}
> +
> +/**
> +  Frees a buffer that was previously allocated with one of the pool allocation functions in the
> +  Memory Allocation Library.
> +
> +  Frees the buffer specified by Buffer.  Buffer must have been allocated on a previous call to the
> +  pool allocation services of the Memory Allocation Library.  If it is not possible to free pool
> +  resources, then this function will perform no actions.
> +
> +  If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,
> +  then ASSERT().
> +
> +  @param  Buffer                The pointer to the buffer to free.
> +
> +**/
> +VOID
> +EFIAPI
> +FreePool (
> +  IN VOID   *Buffer
> +  )
> +{
> +  ASSERT (FALSE);
> +}
> diff --git a/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.uni b/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.uni
> new file mode 100644
> index 000000000000..9acf17bc2038
> --- /dev/null
> +++ b/MdeModulePkg/Library/BaseMemoryAllocationLibNull/BaseMemoryAllocationLibNull.uni
> @@ -0,0 +1,20 @@
> +// /** @file
> +// Null instance of Memory Allocation Library
> +//
> +// Copyright (c) 2007 - 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 Memory Allocation Library"
> +
> +#string STR_MODULE_DESCRIPTION          #language en-US "Memory Allocation Library for build testing only."
> +
>