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 This program and the accompanying materials
   8 are licensed and made available under the terms and conditions of the BSD License
   9 which accompanies this distribution.  The full text of the license may be found at
  10 http://opensource.org/licenses/bsd-license.php
  11
  12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17 #include <Library/SmmMemLib.h>
  18 #include <Library/UefiBootServicesTableLib.h>
  19 #include "FaultTolerantWrite.h"
  20 #include "FaultTolerantWriteSmmCommon.h"
  21
  22 /**
  23   This function checks if the buffer is valid per processor architecture and
  24   does not overlap with SMRAM.
  25
  26   @param Buffer The buffer start address to be checked.
  27   @param Length The buffer length to be checked.
  28
  29   @retval TRUE  This buffer is valid per processor architecture and does not
  30                 overlap with SMRAM.
  31   @retval FALSE This buffer is not valid per processor architecture or overlaps
  32                 with SMRAM.
  33 **/
  34 BOOLEAN
  35 FtwSmmIsBufferOutsideSmmValid (
  36   IN EFI_PHYSICAL_ADDRESS  Buffer,
  37   IN UINT64                Length
  38   )
  39 {
  40   return TRUE;
  41 }
  42
  43 /**
  44   Internal implementation of CRC32. Depending on the execution context
  45   (standalone SMM or DXE vs standalone MM), this function is implemented
  46   via a call to the CalculateCrc32 () boot service, or via a library
  47   call.
  48
  49   If Buffer is NULL, then ASSERT().
  50   If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
  51
  52   @param[in]  Buffer       A pointer to the buffer on which the 32-bit CRC is to be computed.
  53   @param[in]  Length       The number of bytes in the buffer Data.
  54
  55   @retval Crc32            The 32-bit CRC was computed for the data buffer.
  56
  57 **/
  58 UINT32
  59 FtwCalculateCrc32 (
  60   IN  VOID                         *Buffer,
  61   IN  UINTN                        Length
  62   )
  63 {
  64   return CalculateCrc32 (Buffer, Length);
  65 }
  66
  67 /**
  68   Notify the system that the SMM FTW driver is ready.
  69 **/
  70 VOID
  71 FtwNotifySmmReady (
  72   VOID
  73   )
  74 {
  75 }
  76
  77 /**
  78   This function is the entry point of the Fault Tolerant Write driver.
  79
  80   @param[in] ImageHandle        A handle for the image that is initializing this driver
  81   @param[in] MmSystemTable      A pointer to the MM system table
  82
  83   @retval EFI_SUCCESS           The initialization finished successfully.
  84   @retval EFI_OUT_OF_RESOURCES  Allocate memory error
  85   @retval EFI_INVALID_PARAMETER Workspace or Spare block does not exist
  86
  87 **/
  88 EFI_STATUS
  89 EFIAPI
  90 StandaloneMmFaultTolerantWriteInitialize (
  91   IN EFI_HANDLE            ImageHandle,
  92   IN EFI_MM_SYSTEM_TABLE   *MmSystemTable
  93   )
  94 {
  95   return MmFaultTolerantWriteInitialize ();
  96 }