Re: [PATCH v1 09/18] StandaloneMmPkg/MemoryAllocationLib: Add MM memory allocation library.

[Supreeth Venkatesh <Supreeth.Venkatesh@arm.com>]

My response inline.

-----Original Message-----
From: Achin Gupta
Sent: Wednesday, April 25, 2018 9:34 AM
To: Supreeth Venkatesh <Supreeth.Venkatesh@arm.com>
Cc: edk2-devel@lists.01.org; michael.d.kinney@intel.com; liming.gao@intel.com; jiewen.yao@intel.com; leif.lindholm@linaro.org; ard.biesheuvel@linaro.org; nd <nd@arm.com>
Subject: Re: [PATCH v1 09/18] StandaloneMmPkg/MemoryAllocationLib: Add MM memory allocation library.

Hi Supreeth,

On Fri, Apr 06, 2018 at 03:42:14PM +0100, Supreeth Venkatesh wrote:
> This patch implements management mode memory allocation services.The
> implementation borrows the MM Core Memory Allocation services as the
> primitive for memory allocation instead of using MM System Table
> services.

The commit message did not really register with me. Once the MMRAM ranges have been conveyed to the MMST memory allocation services (through MemoryAllocationLibConstructor()), all functions in MemoryAllocationLib.c use the MMST services. The message seems to indicate otherwise.

On Arm, the gEfiMmPeiMmramMemoryReserveGuid HOB is used to convey the MMRAM ranges. It seems x86 uses gMmCoreDataHobGuid HOB. So it worth getting this reviewed by Jiewen.

The copyright years in the files need to be updated.
[Supreeth] Ok. Done.

With that in mind..

Acked-by: Achin Gupta <achin.gupta@arm.com>

>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Achin Gupta <achin.gupta@arm.com>
> Signed-off-by: Supreeth Venkatesh <supreeth.venkatesh@arm.com>
> ---
>  StandaloneMmPkg/Include/Guid/MmCoreData.h          | 132 +++
>  StandaloneMmPkg/Include/Guid/MmramMemoryReserve.h  |  62 ++
>  .../MemoryAllocationLib/MemoryAllocationLib.c      | 907 +++++++++++++++++++++
>  .../MemoryAllocationLib/MemoryAllocationLib.inf    |  49 ++
>  .../MemoryAllocationLib/MemoryAllocationServices.h |  38 +
>  5 files changed, 1188 insertions(+)
>  create mode 100644 StandaloneMmPkg/Include/Guid/MmCoreData.h
>  create mode 100644 StandaloneMmPkg/Include/Guid/MmramMemoryReserve.h
>  create mode 100644
> StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.c
>  create mode 100644
> StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.inf
>  create mode 100644
> StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationServices.h
>
> diff --git a/StandaloneMmPkg/Include/Guid/MmCoreData.h
> b/StandaloneMmPkg/Include/Guid/MmCoreData.h
> new file mode 100644
> index 0000000000..c0ac772014
> --- /dev/null
> +++ b/StandaloneMmPkg/Include/Guid/MmCoreData.h
> @@ -0,0 +1,132 @@
> +/** @file
> +  MM Core data.
> +
> +Copyright (c) 2015, Intel Corporation. All rights reserved.<BR> This
> +program and the accompanying materials are licensed and made
> +available under the terms and conditions of the BSD License that 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.
> +
> +**/
> +
> +#ifndef __MM_CORE_DATA_H__
> +#define __MM_CORE_DATA_H__
> +
> +#define MM_CORE_DATA_HOB_GUID \
> +  { 0xa160bf99, 0x2aa4, 0x4d7d, { 0x99, 0x93, 0x89, 0x9c, 0xb1, 0x2d,
> +0xf3, 0x76 }}
> +
> +extern EFI_GUID gMmCoreDataHobGuid;
> +
> +typedef struct {
> +  //
> +  // Address pointer to MM_CORE_PRIVATE_DATA
> +  //
> +  EFI_PHYSICAL_ADDRESS   Address;
> +} MM_CORE_DATA_HOB_DATA;
> +
> +
> +///
> +/// Define values for the communications buffer used when
> +gEfiEventDxeDispatchGuid is /// event signaled.  This event is
> +signaled by the DXE Core each time the DXE Core /// dispatcher has
> +completed its work.  When this event is signaled, the MM Core /// if
> +notified, so the MM Core can dispatch MM drivers.  If
> +COMM_BUFFER_MM_DISPATCH_ERROR /// is returned in the communication
> +buffer, then an error occurred dispatching MM /// Drivers.  If
> +COMM_BUFFER_MM_DISPATCH_SUCCESS is returned, then the MM Core ///
> +dispatched all the drivers it could.  If
> +COMM_BUFFER_MM_DISPATCH_RESTART is /// returned, then the MM Core just dispatched the MM Driver that registered /// the MM Entry Point enabling the use of MM Mode.  In this case, the MM Core /// should be notified again to dispatch more MM Drivers using MM Mode.
> +///
> +#define COMM_BUFFER_MM_DISPATCH_ERROR    0x00
> +#define COMM_BUFFER_MM_DISPATCH_SUCCESS  0x01 #define
> +COMM_BUFFER_MM_DISPATCH_RESTART  0x02
> +
> +///
> +/// Signature for the private structure shared between the MM IPL and
> +the MM Core /// #define MM_CORE_PRIVATE_DATA_SIGNATURE  SIGNATURE_32
> +('m', 'm', 'i', 'c')
> +
> +///
> +/// Private structure that is used to share information between the
> +MM IPL and /// the MM Core.  This structure is allocated from memory of type EfiRuntimeServicesData.
> +/// Since runtime memory types are converted to available memory when
> +a legacy boot /// is performed, the MM Core must not access any
> +fields of this structure if a legacy /// boot is performed.  As a
> +result, the MM IPL must create an event notification /// for the
> +Legacy Boot event and notify the MM Core that a legacy boot is being
> +/// performed.  The MM Core can then use this information to filter accesses to /// thos structure.
> +///
> +typedef struct {
> +  UINT64                          Signature;
> +
> +  ///
> +  /// The number of MMRAM ranges passed from the MM IPL to the MM
> + Core.  The MM  /// Core uses these ranges of MMRAM to initialize the MM Core memory manager.
> +  ///
> +  UINT64                          MmramRangeCount;
> +
> +  ///
> +  /// A table of MMRAM ranges passed from the MM IPL to the MM Core.
> + The MM  /// Core uses these ranges of MMRAM to initialize the MM Core memory manager.
> +  ///
> +  EFI_PHYSICAL_ADDRESS            MmramRanges;
> +
> +  ///
> +  /// The MM Foundation Entry Point.  The MM Core fills in this field
> + when the  /// MM Core is initialized.  The MM IPL is responsbile for
> + registering this entry  /// point with the MM Configuration
> + Protocol.  The MM Configuration Protocol may  /// not be available
> + at the time the MM IPL and MM Core are started, so the MM IPL  ///
> + sets up a protocol notification on the MM Configuration Protocol and
> + registers  /// the MM Foundation Entry Point as soon as the MM Configuration Protocol is  /// available.
> +  ///
> +  EFI_PHYSICAL_ADDRESS            MmEntryPoint;
> +
> +  ///
> +  /// Boolean flag set to TRUE while an MMI is being processed by the MM Core.
> +  ///
> +  BOOLEAN                         MmEntryPointRegistered;
> +
> +  ///
> +  /// Boolean flag set to TRUE while an MMI is being processed by the MM Core.
> +  ///
> +  BOOLEAN                         InMm;
> +
> +  ///
> +  /// This field is set by the MM Core then the MM Core is
> + initialized.  This field is  /// used by the MM Base 2 Protocol and
> + MM Communication Protocol implementations in  /// the MM IPL.
> +  ///
> +  EFI_PHYSICAL_ADDRESS            Mmst;
> +
> +  ///
> +  /// This field is used by the MM Communicatioon Protocol to pass a
> + buffer into  /// a software MMI handler and for the software MMI
> + handler to pass a buffer back to  /// the caller of the MM Communication Protocol.
> +  ///
> +  EFI_PHYSICAL_ADDRESS            CommunicationBuffer;
> +
> +  ///
> +  /// This field is used by the MM Communicatioon Protocol to pass
> + the size of a buffer,  /// in bytes, into a software MMI handler and
> + for the software MMI handler to pass the  /// size, in bytes, of a buffer back to the caller of the MM Communication Protocol.
> +  ///
> +  UINT64                          BufferSize;
> +
> +  ///
> +  /// This field is used by the MM Communication Protocol to pass the
> + return status from  /// a software MMI handler back to the caller of the MM Communication Protocol.
> +  ///
> +  UINT64                          ReturnStatus;
> +
> +  EFI_PHYSICAL_ADDRESS            MmCoreImageBase;
> +  UINT64                          MmCoreImageSize;
> +  EFI_PHYSICAL_ADDRESS            MmCoreEntryPoint;
> +
> +  EFI_PHYSICAL_ADDRESS            StandaloneBfvAddress;
> +} MM_CORE_PRIVATE_DATA;
> +
> +#endif
> diff --git a/StandaloneMmPkg/Include/Guid/MmramMemoryReserve.h
> b/StandaloneMmPkg/Include/Guid/MmramMemoryReserve.h
> new file mode 100644
> index 0000000000..c4104b755d
> --- /dev/null
> +++ b/StandaloneMmPkg/Include/Guid/MmramMemoryReserve.h
> @@ -0,0 +1,62 @@
> +/** @file
> +  Definition of GUIDed HOB for reserving MMRAM regions.
> +
> +  This file defines:
> +  * the GUID used to identify the GUID HOB for reserving MMRAM regions.
> +  * the data structure of MMRAM descriptor to describe MMRAM
> + candidate regions
> +  * values of state of MMRAM candidate regions
> +  * the GUID specific data structure of HOB for reserving MMRAM regions.
> +  This GUIDed HOB can be used to convey the existence of the T-SEG
> + reservation and H-SEG usage
> +
> +Copyright (c) 2007 - 2010, Intel Corporation. All rights
> +reserved.<BR> Copyright (c) 2016 - 2017, ARM Limited. All rights
> +reserved.<BR>
> +
> +This program and the accompanying materials are licensed and made
> +available under the terms and conditions of the BSD License that 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.
> +
> +  @par Revision Reference:
> +  GUIDs defined in MmCis spec version 0.9.
> +
> +**/
> +
> +#ifndef _EFI_MM_PEI_MMRAM_MEMORY_RESERVE_H_
> +#define _EFI_MM_PEI_MMRAM_MEMORY_RESERVE_H_
> +
> +#define EFI_MM_PEI_MMRAM_MEMORY_RESERVE \
> +  { \
> +    0x0703f912, 0xbf8d, 0x4e2a, {0xbe, 0x07, 0xab, 0x27, 0x25, 0x25,
> +0xc5, 0x92 } \
> +  }
> +
> +/**
> +* GUID specific data structure of HOB for reserving MMRAM regions.
> +*
> +* Inconsistent with specification here:
> +* EFI_HOB_MMRAM_DESCRIPTOR_BLOCK has been changed to EFI_MMRAM_HOB_DESCRIPTOR_BLOCK.
> +* This inconsistency is kept in code in order for backward compatibility.
> +**/
> +typedef struct {
> +  ///
> +  /// Designates the number of possible regions in the system
> +  /// that can be usable for MMRAM.
> +  ///
> +  /// Inconsistent with specification here:
> +  /// In Framework MM CIS 0.91 specification, it defines the field type as UINTN.
> +  /// However, HOBs are supposed to be CPU neutral, so UINT32 should be used instead.
> +  ///
> +  UINT32                NumberOfMmReservedRegions;
> +  ///
> +  /// Used throughout this protocol to describe the candidate
> +  /// regions for MMRAM that are supported by this platform.
> +  ///
> +  EFI_MMRAM_DESCRIPTOR  Descriptor[1]; }
> +EFI_MMRAM_HOB_DESCRIPTOR_BLOCK;
> +
> +extern EFI_GUID gEfiMmPeiSmramMemoryReserveGuid;
> +
> +#endif
> +
> diff --git
> a/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.c
> b/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.c
> new file mode 100644
> index 0000000000..c177a8f538
> --- /dev/null
> +++ b/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.
> +++ c
> @@ -0,0 +1,907 @@
> +/** @file
> +  Support routines for memory allocation routines based on Standalone MM Core internal functions.
> +
> +  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
> + Copyright (c) 2016 - 2017, ARM Limited. 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 <PiMm.h>
> +
> +#include <Guid/MmramMemoryReserve.h>
> +#include <Library/MemoryAllocationLib.h> #include
> +<Library/BaseMemoryLib.h> #include <Library/DebugLib.h> #include
> +<Library/HobLib.h> #include "MemoryAllocationServices.h"
> +
> +EFI_MM_SYSTEM_TABLE   *gMmst = NULL;
> +
> +/**
> +  Allocates one or more 4KB pages of a certain memory type.
> +
> +  Allocates the number of 4KB pages of a certain memory type 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  MemoryType            The type of memory to allocate.
> +  @param  Pages                 The number of 4 KB pages to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +InternalAllocatePages (
> +  IN EFI_MEMORY_TYPE  MemoryType,
> +  IN UINTN            Pages
> +  )
> +{
> +  EFI_STATUS            Status;
> +  EFI_PHYSICAL_ADDRESS  Memory;
> +
> +  if (Pages == 0) {
> +    return NULL;
> +  }
> +
> +  Status = gMmst->MmAllocatePages (AllocateAnyPages, MemoryType,
> +Pages, &Memory);
> +  if (EFI_ERROR (Status)) {
> +    return NULL;
> +  }
> +  return (VOID *) (UINTN) Memory;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocatePages (EfiRuntimeServicesData, Pages); }
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocatePages (EfiRuntimeServicesData, Pages); }
> +
> +/**
> +  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
> +  )
> +{
> +  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                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
> +  )
> +{
> +  EFI_STATUS  Status;
> +
> +  ASSERT (Pages != 0);
> +  Status = gMmst->MmFreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Buffer,
> +Pages);
> +  ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> +  Allocates one or more 4KB pages of a certain memory type at a specified alignment.
> +
> +  Allocates the number of 4KB pages specified by Pages of a certain
> + memory type 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  MemoryType            The type of memory to allocate.
> +  @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 *
> +InternalAllocateAlignedPages (
> +  IN EFI_MEMORY_TYPE  MemoryType,
> +  IN UINTN            Pages,
> +  IN UINTN            Alignment
> +  )
> +{
> +  EFI_STATUS            Status;
> +  EFI_PHYSICAL_ADDRESS  Memory;
> +  UINTN                 AlignedMemory;
> +  UINTN                 AlignmentMask;
> +  UINTN                 UnalignedPages;
> +  UINTN                 RealPages;
> +
> +  //
> +  // Alignment must be a power of two or zero.
> +  //
> +  ASSERT ((Alignment & (Alignment - 1)) == 0);
> +
> +  if (Pages == 0) {
> +    return NULL;
> +  }
> +  if (Alignment > EFI_PAGE_SIZE) {
> +    //
> +    // Calculate the total number of pages since alignment is larger than page size.
> +    //
> +    AlignmentMask  = Alignment - 1;
> +    RealPages      = Pages + EFI_SIZE_TO_PAGES (Alignment);
> +    //
> +    // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.
> +    //
> +    ASSERT (RealPages > Pages);
> +
> +    Status         = gMmst->MmAllocatePages (AllocateAnyPages, MemoryType, RealPages, &Memory);
> +    if (EFI_ERROR (Status)) {
> +      return NULL;
> +    }
> +    AlignedMemory  = ((UINTN) Memory + AlignmentMask) & ~AlignmentMask;
> +    UnalignedPages = EFI_SIZE_TO_PAGES (AlignedMemory - (UINTN) Memory);
> +    if (UnalignedPages > 0) {
> +      //
> +      // Free first unaligned page(s).
> +      //
> +      Status = gMmst->MmFreePages (Memory, UnalignedPages);
> +      ASSERT_EFI_ERROR (Status);
> +    }
> +    Memory         = (EFI_PHYSICAL_ADDRESS) (AlignedMemory + EFI_PAGES_TO_SIZE (Pages));
> +    UnalignedPages = RealPages - Pages - UnalignedPages;
> +    if (UnalignedPages > 0) {
> +      //
> +      // Free last unaligned page(s).
> +      //
> +      Status = gMmst->MmFreePages (Memory, UnalignedPages);
> +      ASSERT_EFI_ERROR (Status);
> +    }
> +  } else {
> +    //
> +    // Do not over-allocate pages in this case.
> +    //
> +    Status = gMmst->MmAllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
> +    if (EFI_ERROR (Status)) {
> +      return NULL;
> +    }
> +    AlignedMemory  = (UINTN) Memory;
> +  }
> +  return (VOID *) AlignedMemory;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocateAlignedPages (EfiRuntimeServicesData, Pages,
> +Alignment); }
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocateAlignedPages (EfiRuntimeServicesData, Pages,
> +Alignment); }
> +
> +/**
> +  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
> +  )
> +{
> +  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                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
> +  )
> +{
> +  EFI_STATUS  Status;
> +
> +  ASSERT (Pages != 0);
> +  Status = gMmst->MmFreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Buffer,
> +Pages);
> +  ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> +  Allocates a buffer of a certain pool type.
> +
> +  Allocates the number bytes specified by AllocationSize of a certain
> + pool type 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  MemoryType            The type of memory to allocate.
> +  @param  AllocationSize        The number of bytes to allocate.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +InternalAllocatePool (
> +  IN EFI_MEMORY_TYPE  MemoryType,
> +  IN UINTN            AllocationSize
> +  )
> +{
> +  EFI_STATUS  Status;
> +  VOID        *Memory;
> +
> +  Memory = NULL;
> +
> +  Status = gMmst->MmAllocatePool (MemoryType, AllocationSize,
> +&Memory);
> +  if (EFI_ERROR (Status)) {
> +    Memory = NULL;
> +  }
> +  return Memory;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocatePool (EfiRuntimeServicesData,
> +AllocationSize); }
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocatePool (EfiRuntimeServicesData,
> +AllocationSize); }
> +
> +/**
> +  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
> +  )
> +{
> +  return NULL;
> +}
> +
> +/**
> +  Allocates and zeros a buffer of a certain pool type.
> +
> +  Allocates the number bytes specified by AllocationSize of a certain
> + pool type, 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  PoolType              The type of memory to allocate.
> +  @param  AllocationSize        The number of bytes to allocate and zero.
> +
> +  @return A pointer to the allocated buffer or NULL if allocation fails.
> +
> +**/
> +VOID *
> +InternalAllocateZeroPool (
> +  IN EFI_MEMORY_TYPE  PoolType,
> +  IN UINTN            AllocationSize
> +  )
> +{
> +  VOID  *Memory;
> +
> +  Memory = InternalAllocatePool (PoolType, AllocationSize);
> +  if (Memory != NULL) {
> +    Memory = ZeroMem (Memory, AllocationSize);
> +  }
> +  return Memory;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocateZeroPool (EfiRuntimeServicesData,
> +AllocationSize); }
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocateZeroPool (EfiRuntimeServicesData,
> +AllocationSize); }
> +
> +/**
> +  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
> +  )
> +{
> +  return NULL;
> +}
> +
> +/**
> +  Copies a buffer to an allocated buffer of a certain pool type.
> +
> +  Allocates the number bytes specified by AllocationSize of a certain
> + pool type, 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  PoolType              The type of pool to allocate.
> +  @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 *
> +InternalAllocateCopyPool (
> +  IN EFI_MEMORY_TYPE  PoolType,
> +  IN UINTN            AllocationSize,
> +  IN CONST VOID       *Buffer
> +  )
> +{
> +  VOID  *Memory;
> +
> +  ASSERT (Buffer != NULL);
> +  ASSERT (AllocationSize <= (MAX_ADDRESS - (UINTN) Buffer + 1));
> +
> +  Memory = InternalAllocatePool (PoolType, AllocationSize);
> +  if (Memory != NULL) {
> +     Memory = CopyMem (Memory, Buffer, AllocationSize);
> +  }
> +  return Memory;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocateCopyPool (EfiRuntimeServicesData,
> +AllocationSize, Buffer); }
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalAllocateCopyPool (EfiRuntimeServicesData,
> +AllocationSize, Buffer); }
> +
> +/**
> +  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
> +  )
> +{
> +  return NULL;
> +}
> +
> +/**
> +  Reallocates a buffer of a specified memory type.
> +
> +  Allocates and zeros the number bytes specified by NewSize from
> + memory of the type  specified by PoolType.  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  PoolType       The type of pool to allocate.
> +  @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 *
> +InternalReallocatePool (
> +  IN EFI_MEMORY_TYPE  PoolType,
> +  IN UINTN            OldSize,
> +  IN UINTN            NewSize,
> +  IN VOID             *OldBuffer  OPTIONAL
> +  )
> +{
> +  VOID  *NewBuffer;
> +
> +  NewBuffer = InternalAllocateZeroPool (PoolType, NewSize);
> +  if (NewBuffer != NULL && OldBuffer != NULL) {
> +    CopyMem (NewBuffer, OldBuffer, MIN (OldSize, NewSize));
> +    FreePool (OldBuffer);
> +  }
> +  return NewBuffer;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalReallocatePool (EfiRuntimeServicesData, OldSize,
> +NewSize, OldBuffer); }
> +
> +/**
> +  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
> +  )
> +{
> +  return InternalReallocatePool (EfiRuntimeServicesData, OldSize,
> +NewSize, OldBuffer); }
> +
> +/**
> +  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
> +  )
> +{
> +  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                Pointer to the buffer to free.
> +
> +**/
> +VOID
> +EFIAPI
> +FreePool (
> +  IN VOID   *Buffer
> +  )
> +{
> +  EFI_STATUS    Status;
> +
> +  Status = gMmst->MmFreePool (Buffer);
> +  ASSERT_EFI_ERROR (Status);
> +}
> +
> +/**
> +  The constructor function calls MmInitializeMemoryServices to
> +initialize
> +  memory in MMRAM and caches EFI_MM_SYSTEM_TABLE pointer.
> +
> +  @param  ImageHandle   The firmware allocated handle for the EFI image.
> +  @param  SystemTable   A pointer to the Management mode System Table.
> +
> +  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MemoryAllocationLibConstructor (
> +  IN EFI_HANDLE             ImageHandle,
> +  IN EFI_MM_SYSTEM_TABLE    *MmSystemTable
> +  )
> +{
> +  MM_CORE_PRIVATE_DATA           *MmCorePrivate;
> +  EFI_HOB_GUID_TYPE               *GuidHob;
> +  MM_CORE_DATA_HOB_DATA          *DataInHob;
> +  VOID                            *HobStart;
> +  EFI_MMRAM_HOB_DESCRIPTOR_BLOCK  *MmramRangesHobData;
> +  EFI_MMRAM_DESCRIPTOR            *MmramRanges;
> +  UINT32                           MmramRangeCount;
> +  EFI_HOB_GUID_TYPE               *MmramRangesHob;
> +
> +  HobStart = GetHobList ();
> +  DEBUG ((DEBUG_INFO, "StandaloneMmCoreMemoryAllocationLibConstructor
> + - 0x%x\n", HobStart));
> +
> +  //
> +  // Extract MM Core Private context from the Hob. If absent search
> + for  // a Hob containing the MMRAM ranges  //  GuidHob =
> + GetNextGuidHob (&gMmCoreDataHobGuid, HobStart);  if (GuidHob ==
> + NULL) {
> +    MmramRangesHob = GetNextGuidHob (&gEfiMmPeiMmramMemoryReserveGuid, HobStart);
> +    if (MmramRangesHob == NULL) {
> +      return EFI_UNSUPPORTED;
> +    }
> +
> +    MmramRangesHobData = GET_GUID_HOB_DATA (MmramRangesHob);
> +    if (MmramRangesHobData == NULL) {
> +      return EFI_UNSUPPORTED;
> +    }
> +
> +    MmramRanges = MmramRangesHobData->Descriptor;
> +    if (MmramRanges == NULL) {
> +      return EFI_UNSUPPORTED;
> +    }
> +
> +    MmramRangeCount = MmramRangesHobData->NumberOfMmReservedRegions;
> +    if (MmramRanges == NULL) {
> +      return EFI_UNSUPPORTED;
> +    }
> +
> +  } else {
> +    DataInHob      = GET_GUID_HOB_DATA (GuidHob);
> +    MmCorePrivate = (MM_CORE_PRIVATE_DATA *)(UINTN)DataInHob->Address;
> +    MmramRanges     = (EFI_MMRAM_DESCRIPTOR *)(UINTN)MmCorePrivate->MmramRanges;
> +    MmramRangeCount = MmCorePrivate->MmramRangeCount;  }
> +
> +  {
> +    UINTN                Index;
> +
> +    DEBUG ((DEBUG_INFO, "MmramRangeCount - 0x%x\n", MmramRangeCount));
> +    for (Index = 0; Index < MmramRangeCount; Index++) {
> +      DEBUG ((DEBUG_INFO, "MmramRanges[%d]: 0x%016lx - 0x%016lx\n", Index, MmramRanges[Index].CpuStart, MmramRanges[Index].PhysicalSize));
> +    }
> +  }
> +
> +  //
> +  // Initialize memory service using free MMRAM  //  DEBUG
> + ((DEBUG_INFO, "MmInitializeMemoryServices\n"));
> + MmInitializeMemoryServices ((UINTN)MmramRangeCount, (VOID
> + *)(UINTN)MmramRanges);
> +
> +  // Initialize MM Services Table
> +  gMmst = MmSystemTable;
> +  return EFI_SUCCESS;
> +}
> diff --git
> a/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.inf
> b/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.inf
> new file mode 100644
> index 0000000000..068607f90e
> --- /dev/null
> +++ b/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationLib.
> +++ inf
> @@ -0,0 +1,49 @@
> +## @file
> +# Memory Allocation Library instance dedicated to MM Core.
> +# The implementation borrows the MM Core Memory Allocation services
> +as the primitive # for memory allocation instead of using MM System Table servces in an indirect way.
> +# It is assumed that this library instance must be linked with MM Core in this package.
> +#
> +# Copyright (c) 2010 - 2015, Intel Corporation. All rights
> +reserved.<BR> # Copyright (c) 2016 - 2017, ARM Limited. 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                    = 0x0001001A
> +  BASE_NAME                      = MemoryAllocationLib
> +  FILE_GUID                      = DCDCBE1D-E760-4E1D-85B4-96E3F0439C41
> +  MODULE_TYPE                    = MM_CORE_STANDALONE
> +  VERSION_STRING                 = 1.0
> +  PI_SPECIFICATION_VERSION       = 0x00010032
> +  LIBRARY_CLASS                  = MemoryAllocationLib|MM_CORE_STANDALONE
> +  CONSTRUCTOR                    = MemoryAllocationLibConstructor
> +
> +#
> +# The following information is for reference only and not required by the build tools.
> +#
> +#  VALID_ARCHITECTURES           = IA32 X64
> +#
> +
> +[Sources]
> +  MemoryAllocationLib.c
> +  MemoryAllocationServices.h
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  StandaloneMmPkg/StandaloneMmPkg.dec
> +
> +[LibraryClasses]
> +  BaseMemoryLib
> +  DebugLib
> +  HobLib
> +
> +[Guids]
> +  gEfiMmPeiMmramMemoryReserveGuid
> diff --git
> a/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationServices
> .h
> b/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationServices
> .h
> new file mode 100644
> index 0000000000..eb4f4c3984
> --- /dev/null
> +++ b/StandaloneMmPkg/Library/MemoryAllocationLib/MemoryAllocationServ
> +++ ices.h
> @@ -0,0 +1,38 @@
> +/** @file
> +  Contains function prototypes for Memory Services in the MM Core.
> +
> +  This header file borrows the StandaloneMmCore Memory Allocation
> + services as the primitive  for memory allocation.
> +
> +  Copyright (c) 2008 - 2015, Intel Corporation. All rights
> + reserved.<BR>  Copyright (c) 2016 - 2017, ARM Limited. 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.
> +
> +**/
> +
> +#ifndef _PI_MM_CORE_MEMORY_ALLOCATION_SERVICES_H_
> +#define _PI_MM_CORE_MEMORY_ALLOCATION_SERVICES_H_
> +
> +#include <Guid/MmCoreData.h>
> +
> +/**
> +  Called to initialize the memory service.
> +
> +  @param   MmramRangeCount       Number of MMRAM Regions
> +  @param   MmramRanges           Pointer to MMRAM Descriptors
> +
> +**/
> +VOID
> +MmInitializeMemoryServices (
> +  IN UINTN                 MmramRangeCount,
> +  IN EFI_MMRAM_DESCRIPTOR  *MmramRanges
> +  );
> +
> +#endif
> --
> 2.16.2
>
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