Re: [PATCH v1 08/18] StandaloneMmPkg/MemLib: AARCH64 Specific instance of memory check library.

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

My response inline.

-----Original Message-----
From: Achin Gupta
Sent: Monday, April 16, 2018 10:13 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 08/18] StandaloneMmPkg/MemLib: AARCH64 Specific instance of memory check library.

Hi Supreeth,

On Fri, Apr 06, 2018 at 03:42:13PM +0100, Supreeth Venkatesh wrote:
> MM memory check library library implementation. This library consumes
> MM_ACCESS_PROTOCOL to get MMRAM information. In order to use this
> library instance, the platform should produce all MMRAM range via
> MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core and
> MM driver) and/or specific dedicated hardware.
>
> This patch provides services for MM Memory Operation.
> The management mode Mem Library provides function for checking if
> buffer is outside MMRAM and valid. It also provides functions for copy
> data from MMRAM to non-MMRAM, from non-MMRAM to MMRAM, from non-MMRAM
> to non-MMRAM, or set data in non-MMRAM.
>
> 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/Library/MemLib.h    | 140 ++++++++++++++
>  StandaloneMmPkg/Library/MemLib/Arm/MemLib.c | 276
> ++++++++++++++++++++++++++++

Why is this Library Arm specific. Apart from cosmetics tweaks, it has not changed since it was originally contributed?
[Supreeth] Modified it to separate out MmMemLibInternalCalculateMaximumSupportAddress() specific to archictecture as mentioned by Jiewen. Rest of them are generic.

cheers,
Achin

>  StandaloneMmPkg/Library/MemLib/MemLib.inf   |  47 +++++
>  3 files changed, 463 insertions(+)
>  create mode 100644 StandaloneMmPkg/Include/Library/MemLib.h
>  create mode 100644 StandaloneMmPkg/Library/MemLib/Arm/MemLib.c
>  create mode 100644 StandaloneMmPkg/Library/MemLib/MemLib.inf
>
> diff --git a/StandaloneMmPkg/Include/Library/MemLib.h
> b/StandaloneMmPkg/Include/Library/MemLib.h
> new file mode 100644
> index 0000000000..3264f10010
> --- /dev/null
> +++ b/StandaloneMmPkg/Include/Library/MemLib.h
> @@ -0,0 +1,140 @@
> +/** @file
> +  Provides services for MM Memory Operation.
> +
> +  The MM Mem Library provides function for checking if buffer is outside MMRAM and valid.
> +  It also provides functions for copy data from MMRAM to non-MMRAM,
> + from non-MMRAM to MMRAM,  from non-MMRAM to non-MMRAM, or set data in non-MMRAM.
> +
> +  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.
> +
> +**/
> +
> +#ifndef _MM_MEM_LIB_H_
> +#define _MM_MEM_LIB_H_
> +
> +/**
> +  This function check if the buffer is valid per processor architecture and not overlap with MMRAM.
> +
> +  @param Buffer  The buffer start address to be checked.
> +  @param Length  The buffer length to be checked.
> +
> +  @retval TRUE  This buffer is valid per processor architecture and not overlap with MMRAM.
> +  @retval FALSE This buffer is not valid per processor architecture or overlap with MMRAM.
> +**/
> +BOOLEAN
> +EFIAPI
> +MmIsBufferOutsideMmValid (
> +  IN EFI_PHYSICAL_ADDRESS  Buffer,
> +  IN UINT64                Length
> +  );
> +
> +/**
> +  Copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +
> +  This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +  It checks if source buffer is valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it copies memory and returns EFI_SUCCESS.
> +  If the check fails, it return EFI_SECURITY_VIOLATION.
> +  The implementation must be reentrant.
> +
> +  @param  DestinationBuffer   The pointer to the destination buffer of the memory copy.
> +  @param  SourceBuffer        The pointer to the source buffer of the memory copy.
> +  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is copied.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmCopyMemToSmram (
> +  OUT VOID       *DestinationBuffer,
> +  IN CONST VOID  *SourceBuffer,
> +  IN UINTN       Length
> +  );
> +
> +/**
> +  Copies a source buffer (MMRAM) to a destination buffer (NON-MMRAM).
> +
> +  This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +  It checks if destination buffer is valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it copies memory and returns EFI_SUCCESS.
> +  If the check fails, it returns EFI_SECURITY_VIOLATION.
> +  The implementation must be reentrant.
> +
> +  @param  DestinationBuffer   The pointer to the destination buffer of the memory copy.
> +  @param  SourceBuffer        The pointer to the source buffer of the memory copy.
> +  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is copied.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmCopyMemFromSmram (
> +  OUT VOID       *DestinationBuffer,
> +  IN CONST VOID  *SourceBuffer,
> +  IN UINTN       Length
> +  );
> +
> +/**
> +  Copies a source buffer (NON-MMRAM) to a destination buffer (NON-MMRAM).
> +
> +  This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +  It checks if source buffer and destination buffer are valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it copies memory and returns EFI_SUCCESS.
> +  If the check fails, it returns EFI_SECURITY_VIOLATION.
> +  The implementation must be reentrant, and it must handle the case where source buffer overlaps destination buffer.
> +
> +  @param  DestinationBuffer   The pointer to the destination buffer of the memory copy.
> +  @param  SourceBuffer        The pointer to the source buffer of the memory copy.
> +  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is copied.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmCopyMem (
> +  OUT VOID       *DestinationBuffer,
> +  IN CONST VOID  *SourceBuffer,
> +  IN UINTN       Length
> +  );
> +
> +/**
> +  Fills a target buffer (NON-MMRAM) with a byte value.
> +
> +  This function fills a target buffer (non-MMRAM) with a byte value.
> +  It checks if target buffer is valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it fills memory and returns EFI_SUCCESS.
> +  If the check fails, it returns EFI_SECURITY_VIOLATION.
> +
> +  @param  Buffer    The memory to set.
> +  @param  Length    The number of bytes to set.
> +  @param  Value     The value with which to fill Length bytes of Buffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The Buffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is set.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmSetMem (
> +  OUT VOID  *Buffer,
> +  IN UINTN  Length,
> +  IN UINT8  Value
> +  );
> +
> +#endif
> diff --git a/StandaloneMmPkg/Library/MemLib/Arm/MemLib.c
> b/StandaloneMmPkg/Library/MemLib/Arm/MemLib.c
> new file mode 100644
> index 0000000000..432a45698b
> --- /dev/null
> +++ b/StandaloneMmPkg/Library/MemLib/Arm/MemLib.c
> @@ -0,0 +1,276 @@
> +/** @file
> +  Instance of MM memory check library.
> +
> +  MM memory check library library implementation. This library
> + consumes MM_ACCESS_PROTOCOL  to get MMRAM information. In order to
> + use this library instance, the platform should produce  all MMRAM
> + range via MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core  and MM driver) and/or specific dedicated hardware.
> +
> +  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 <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/DebugLib.h>
> +
> +EFI_MMRAM_DESCRIPTOR *mMmMemLibInternalMmramRanges;
> +UINTN                mMmMemLibInternalMmramCount;
> +
> +//
> +// Maximum support address used to check input buffer //
> +EFI_PHYSICAL_ADDRESS  mMmMemLibInternalMaximumSupportAddress = 0;
> +
> +/**
> +  Calculate and save the maximum support address.
> +
> +**/
> +VOID
> +MmMemLibInternalCalculateMaximumSupportAddress (
> +  VOID
> +  )
> +{
> +  UINT8        PhysicalAddressBits;
> +
> +  PhysicalAddressBits = 36;
> +
> +  //
> +  // Save the maximum support address in one global variable
> +  //
> +  mMmMemLibInternalMaximumSupportAddress =
> +(EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) -
> +1);
> +  DEBUG ((DEBUG_INFO, "mMmMemLibInternalMaximumSupportAddress =
> +0x%lx\n", mMmMemLibInternalMaximumSupportAddress));
> +}
> +
> +/**
> +  This function check if the buffer is valid per processor architecture and not overlap with MMRAM.
> +
> +  @param Buffer  The buffer start address to be checked.
> +  @param Length  The buffer length to be checked.
> +
> +  @retval TRUE  This buffer is valid per processor architecture and not overlap with MMRAM.
> +  @retval FALSE This buffer is not valid per processor architecture or overlap with MMRAM.
> +**/
> +BOOLEAN
> +EFIAPI
> +MmIsBufferOutsideMmValid (
> +  IN EFI_PHYSICAL_ADDRESS  Buffer,
> +  IN UINT64                Length
> +  )
> +{
> +  UINTN  Index;
> +
> +  //
> +  // Check override.
> +  // NOTE: (B:0->L:4G) is invalid for IA32, but (B:1->L:4G-1)/(B:4G-1->L:1) is valid.
> +  //
> +  if ((Length > mMmMemLibInternalMaximumSupportAddress) ||
> +      (Buffer > mMmMemLibInternalMaximumSupportAddress) ||
> +      ((Length != 0) && (Buffer > (mMmMemLibInternalMaximumSupportAddress - (Length - 1)))) ) {
> +    //
> +    // Overflow happen
> +    //
> +    DEBUG ((
> +      DEBUG_ERROR,
> +      "MmIsBufferOutsideMmValid: Overflow: Buffer (0x%lx) - Length (0x%lx), MaximumSupportAddress (0x%lx)\n",
> +      Buffer,
> +      Length,
> +      mMmMemLibInternalMaximumSupportAddress
> +      ));
> +    return FALSE;
> +  }
> +
> +  for (Index = 0; Index < mMmMemLibInternalMmramCount; Index ++) {
> +    if (((Buffer >= mMmMemLibInternalMmramRanges[Index].CpuStart) && (Buffer < mMmMemLibInternalMmramRanges[Index].CpuStart + mMmMemLibInternalMmramRanges[Index].PhysicalSize)) ||
> +        ((mMmMemLibInternalMmramRanges[Index].CpuStart >= Buffer) && (mMmMemLibInternalMmramRanges[Index].CpuStart < Buffer + Length))) {
> +      DEBUG ((
> +        DEBUG_ERROR,
> +        "MmIsBufferOutsideMmValid: Overlap: Buffer (0x%lx) - Length (0x%lx), ",
> +        Buffer,
> +        Length
> +        ));
> +      DEBUG ((
> +        DEBUG_ERROR,
> +        "CpuStart (0x%lx) - PhysicalSize (0x%lx)\n",
> +        mMmMemLibInternalMmramRanges[Index].CpuStart,
> +        mMmMemLibInternalMmramRanges[Index].PhysicalSize
> +        ));
> +      return FALSE;
> +    }
> +  }
> +
> +  return TRUE;
> +}
> +
> +/**
> +  Copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +
> +  This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +  It checks if source buffer is valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it copies memory and returns EFI_SUCCESS.
> +  If the check fails, it return EFI_SECURITY_VIOLATION.
> +  The implementation must be reentrant.
> +
> +  @param  DestinationBuffer   The pointer to the destination buffer of the memory copy.
> +  @param  SourceBuffer        The pointer to the source buffer of the memory copy.
> +  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is copied.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmCopyMemToMmram (
> +  OUT VOID       *DestinationBuffer,
> +  IN CONST VOID  *SourceBuffer,
> +  IN UINTN       Length
> +  )
> +{
> +  if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) {
> +    DEBUG ((DEBUG_ERROR, "MmCopyMemToMmram: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length));
> +    return EFI_SECURITY_VIOLATION;
> +  }
> +  CopyMem (DestinationBuffer, SourceBuffer, Length);
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Copies a source buffer (MMRAM) to a destination buffer (NON-MMRAM).
> +
> +  This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +  It checks if destination buffer is valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it copies memory and returns EFI_SUCCESS.
> +  If the check fails, it returns EFI_SECURITY_VIOLATION.
> +  The implementation must be reentrant.
> +
> +  @param  DestinationBuffer   The pointer to the destination buffer of the memory copy.
> +  @param  SourceBuffer        The pointer to the source buffer of the memory copy.
> +  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is copied.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmCopyMemFromMmram (
> +  OUT VOID       *DestinationBuffer,
> +  IN CONST VOID  *SourceBuffer,
> +  IN UINTN       Length
> +  )
> +{
> +  if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) {
> +    DEBUG ((DEBUG_ERROR, "MmCopyMemFromMmram: Security Violation: Destination (0x%x), Length (0x%x)\n", DestinationBuffer, Length));
> +    return EFI_SECURITY_VIOLATION;
> +  }
> +  CopyMem (DestinationBuffer, SourceBuffer, Length);
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Copies a source buffer (NON-MMRAM) to a destination buffer (NON-MMRAM).
> +
> +  This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).
> +  It checks if source buffer and destination buffer are valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it copies memory and returns EFI_SUCCESS.
> +  If the check fails, it returns EFI_SECURITY_VIOLATION.
> +  The implementation must be reentrant, and it must handle the case where source buffer overlaps destination buffer.
> +
> +  @param  DestinationBuffer   The pointer to the destination buffer of the memory copy.
> +  @param  SourceBuffer        The pointer to the source buffer of the memory copy.
> +  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is copied.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmCopyMem (
> +  OUT VOID       *DestinationBuffer,
> +  IN CONST VOID  *SourceBuffer,
> +  IN UINTN       Length
> +  )
> +{
> +  if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) {
> +    DEBUG ((DEBUG_ERROR, "MmCopyMem: Security Violation: Destination (0x%x), Length (0x%x)\n", DestinationBuffer, Length));
> +    return EFI_SECURITY_VIOLATION;
> +  }
> +  if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) {
> +    DEBUG ((DEBUG_ERROR, "MmCopyMem: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length));
> +    return EFI_SECURITY_VIOLATION;
> +  }
> +  CopyMem (DestinationBuffer, SourceBuffer, Length);
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Fills a target buffer (NON-MMRAM) with a byte value.
> +
> +  This function fills a target buffer (non-MMRAM) with a byte value.
> +  It checks if target buffer is valid per processor architecture and not overlap with MMRAM.
> +  If the check passes, it fills memory and returns EFI_SUCCESS.
> +  If the check fails, it returns EFI_SECURITY_VIOLATION.
> +
> +  @param  Buffer    The memory to set.
> +  @param  Length    The number of bytes to set.
> +  @param  Value     The value with which to fill Length bytes of Buffer.
> +
> +  @retval EFI_SECURITY_VIOLATION The Buffer is invalid per processor architecture or overlap with MMRAM.
> +  @retval EFI_SUCCESS            Memory is set.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MmSetMem (
> +  OUT VOID  *Buffer,
> +  IN UINTN  Length,
> +  IN UINT8  Value
> +  )
> +{
> +  if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)Buffer, Length)) {
> +    DEBUG ((DEBUG_ERROR, "MmSetMem: Security Violation: Source (0x%x), Length (0x%x)\n", Buffer, Length));
> +    return EFI_SECURITY_VIOLATION;
> +  }
> +  SetMem (Buffer, Length, Value);
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  The constructor function initializes the Mm Mem library
> +
> +  @param  ImageHandle   The firmware allocated handle for the EFI image.
> +  @param  SystemTable   A pointer to the EFI System Table.
> +
> +  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +MemLibConstructor (
> +  IN EFI_HANDLE             ImageHandle,
> +  IN EFI_MM_SYSTEM_TABLE    *MmSystemTable
> +  )
> +{
> +
> +  //
> +  // Calculate and save maximum support address  //
> + MmMemLibInternalCalculateMaximumSupportAddress ();
> +
> +  return EFI_SUCCESS;
> +}
> diff --git a/StandaloneMmPkg/Library/MemLib/MemLib.inf
> b/StandaloneMmPkg/Library/MemLib/MemLib.inf
> new file mode 100644
> index 0000000000..52b7c06397
> --- /dev/null
> +++ b/StandaloneMmPkg/Library/MemLib/MemLib.inf
> @@ -0,0 +1,47 @@
> +## @file
> +#  Instance of MM memory check library.
> +#
> +#  MM memory check library library implementation. This library
> +consumes MM_ACCESS_PROTOCOL #  to get MMRAM information. In order to
> +use this library instance, the platform should produce #  all MMRAM
> +range via MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core #  and MM driver) and/or specific dedicated hardware.
> +#
> +#  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.
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x0001001A
> +  BASE_NAME                      = MemLib
> +  FILE_GUID                      = EA355F14-6409-4716-829F-37B3BC7C7F26
> +  MODULE_TYPE                    = MM_STANDALONE
> +  VERSION_STRING                 = 1.0
> +  PI_SPECIFICATION_VERSION       = 0x00010032
> +  LIBRARY_CLASS                  = MemLib|MM_STANDALONE MM_CORE_STANDALONE
> +  CONSTRUCTOR                    = MemLibConstructor
> +
> +#
> +# The following information is for reference only and not required by the build tools.
> +#
> +#  VALID_ARCHITECTURES           = AARCH64
> +#
> +
> +[Sources.AARCH64]
> +  Arm/MemLib.c
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  StandaloneMmPkg/StandaloneMmPkg.dec
> +
> +[LibraryClasses]
> +  BaseMemoryLib
> +  DebugLib
> --
> 2.16.2
>
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