MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteStandaloneMm.c

   1 /** @file
   2
   3   Parts of the SMM/MM implementation that are specific to standalone MM
   4
   5 Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
   6 Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
   7 SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #include <Library/SmmMemLib.h>
  12 #include <Library/UefiBootServicesTableLib.h>
  13 #include "FaultTolerantWrite.h"
  14 #include "FaultTolerantWriteSmmCommon.h"
  15
  16 /**
  17   This function checks if the buffer is valid per processor architecture and
  18   does not overlap with SMRAM.
  19
  20   @param Buffer The buffer start address to be checked.
  21   @param Length The buffer length to be checked.
  22
  23   @retval TRUE  This buffer is valid per processor architecture and does not
  24                 overlap with SMRAM.
  25   @retval FALSE This buffer is not valid per processor architecture or overlaps
  26                 with SMRAM.
  27 **/
  28 BOOLEAN
  29 FtwSmmIsBufferOutsideSmmValid (
  30   IN EFI_PHYSICAL_ADDRESS  Buffer,
  31   IN UINT64                Length
  32   )
  33 {
  34   return TRUE;
  35 }
  36
  37 /**
  38   Internal implementation of CRC32. Depending on the execution context
  39   (standalone SMM or DXE vs standalone MM), this function is implemented
  40   via a call to the CalculateCrc32 () boot service, or via a library
  41   call.
  42
  43   If Buffer is NULL, then ASSERT().
  44   If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
  45
  46   @param[in]  Buffer       A pointer to the buffer on which the 32-bit CRC is to be computed.
  47   @param[in]  Length       The number of bytes in the buffer Data.
  48
  49   @retval Crc32            The 32-bit CRC was computed for the data buffer.
  50
  51 **/
  52 UINT32
  53 FtwCalculateCrc32 (
  54   IN  VOID                         *Buffer,
  55   IN  UINTN                        Length
  56   )
  57 {
  58   return CalculateCrc32 (Buffer, Length);
  59 }
  60
  61 /**
  62   Notify the system that the SMM FTW driver is ready.
  63 **/
  64 VOID
  65 FtwNotifySmmReady (
  66   VOID
  67   )
  68 {
  69 }
  70
  71 /**
  72   This function is the entry point of the Fault Tolerant Write driver.
  73
  74   @param[in] ImageHandle        A handle for the image that is initializing this driver
  75   @param[in] MmSystemTable      A pointer to the MM system table
  76
  77   @retval EFI_SUCCESS           The initialization finished successfully.
  78   @retval EFI_OUT_OF_RESOURCES  Allocate memory error
  79   @retval EFI_INVALID_PARAMETER Workspace or Spare block does not exist
  80
  81 **/
  82 EFI_STATUS
  83 EFIAPI
  84 StandaloneMmFaultTolerantWriteInitialize (
  85   IN EFI_HANDLE            ImageHandle,
  86   IN EFI_MM_SYSTEM_TABLE   *MmSystemTable
  87   )
  88 {
  89   return MmFaultTolerantWriteInitialize ();
  90 }