audk/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteStandaloneMm.c

/** @file

  Parts of the SMM/MM implementation that are specific to standalone MM

Copyright (c) 2010 - 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 <Library/SmmMemLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include "FaultTolerantWrite.h"
#include "FaultTolerantWriteSmmCommon.h"

/**
  This function checks if the buffer is valid per processor architecture and
  does not overlap with SMRAM.

  @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 does not
                overlap with SMRAM.
  @retval FALSE This buffer is not valid per processor architecture or overlaps
                with SMRAM.
**/
BOOLEAN
FtwSmmIsBufferOutsideSmmValid (
  IN EFI_PHYSICAL_ADDRESS  Buffer,
  IN UINT64                Length
  )
{
  return TRUE;
}

/**
  Internal implementation of CRC32. Depending on the execution context
  (standalone SMM or DXE vs standalone MM), this function is implemented
  via a call to the CalculateCrc32 () boot service, or via a library
  call.

  If Buffer is NULL, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param[in]  Buffer       A pointer to the buffer on which the 32-bit CRC is to be computed.
  @param[in]  Length       The number of bytes in the buffer Data.

  @retval Crc32            The 32-bit CRC was computed for the data buffer.

**/
UINT32
FtwCalculateCrc32 (
  IN  VOID                         *Buffer,
  IN  UINTN                        Length
  )
{
  return CalculateCrc32 (Buffer, Length);
}

/**
  Notify the system that the SMM FTW driver is ready.
**/
VOID
FtwNotifySmmReady (
  VOID
  )
{
}

/**
  This function is the entry point of the Fault Tolerant Write driver.

  @param[in] ImageHandle        A handle for the image that is initializing this driver
  @param[in] MmSystemTable      A pointer to the MM system table

  @retval EFI_SUCCESS           The initialization finished successfully.
  @retval EFI_OUT_OF_RESOURCES  Allocate memory error
  @retval EFI_INVALID_PARAMETER Workspace or Spare block does not exist

**/
EFI_STATUS
EFIAPI
StandaloneMmFaultTolerantWriteInitialize (
  IN EFI_HANDLE            ImageHandle,
  IN EFI_MM_SYSTEM_TABLE   *MmSystemTable
  )
{
  return MmFaultTolerantWriteInitialize ();
}