MdeModulePkg/FaultTolerantWriteDxe: implement standalone MM version

Implement a new version of the fault tolerant write driver that can be used in the context of a standalone MM implementation. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>
2019-01-03 19:28:23 +01:00
parent 22cedf5bbd
commit d0def00d33
2 changed files with 186 additions and 0 deletions
--- a/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteStandaloneMm.c
+++ b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteStandaloneMm.c
@@ -0,0 +1,96 @@
+/** @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 ();
+}