MdeModulePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdeModulePkg / Universal / Variable / RuntimeDxe / VariableTraditionalMm.c

/** @file\r
\r
  Parts of the SMM/MM implementation that are specific to traditional MM\r
\r
Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR>\r
Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/SmmMemLib.h>\r
#include "Variable.h"\r
\r
/**\r
  This function checks if the buffer is valid per processor architecture and\r
  does not overlap with SMRAM.\r
\r
  @param Buffer The buffer start address to be checked.\r
  @param Length The buffer length to be checked.\r
\r
  @retval TRUE  This buffer is valid per processor architecture and does not\r
                overlap with SMRAM.\r
  @retval FALSE This buffer is not valid per processor architecture or overlaps\r
                with SMRAM.\r
**/\r
BOOLEAN\r
VariableSmmIsBufferOutsideSmmValid (\r
  IN EFI_PHYSICAL_ADDRESS  Buffer,\r
  IN UINT64                Length\r
  )\r
{\r
  return SmmIsBufferOutsideSmmValid (Buffer, Length);\r
}\r
\r
/**\r
  Notify the system that the SMM variable driver is ready.\r
**/\r
VOID\r
VariableNotifySmmReady (\r
  VOID\r
  )\r
{\r
  EFI_STATUS            Status;\r
  EFI_HANDLE            Handle;\r
\r
  Handle = NULL;\r
  Status = gBS->InstallProtocolInterface (\r
                  &Handle,\r
                  &gEfiSmmVariableProtocolGuid,\r
                  EFI_NATIVE_INTERFACE,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
}\r
\r
/**\r
  Notify the system that the SMM variable write driver is ready.\r
**/\r
VOID\r
VariableNotifySmmWriteReady (\r
  VOID\r
  )\r
{\r
  EFI_STATUS            Status;\r
  EFI_HANDLE            Handle;\r
\r
  Handle = NULL;\r
  Status = gBS->InstallProtocolInterface (\r
                  &Handle,\r
                  &gSmmVariableWriteGuid,\r
                  EFI_NATIVE_INTERFACE,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
}\r
\r
/**\r
  Variable service MM driver entry point\r
\r
  @param[in] ImageHandle    A handle for the image that is initializing this\r
                            driver\r
  @param[in] SystemTable    A pointer to the EFI system table\r
\r
  @retval EFI_SUCCESS       Variable service successfully initialized.\r
**/\r
EFI_STATUS\r
EFIAPI\r
VariableServiceInitialize (\r
  IN EFI_HANDLE                           ImageHandle,\r
  IN EFI_SYSTEM_TABLE                     *SystemTable\r
  )\r
{\r
  return MmVariableServiceInitialize ();\r
}\r
\r
/**\r
  Whether the TCG or TCG2 protocols are installed in the UEFI protocol database.\r
  This information is used by the MorLock code to infer whether an existing\r
  MOR variable is legitimate or not.\r
\r
  @retval TRUE  Either the TCG or TCG2 protocol is installed in the UEFI\r
                protocol database\r
  @retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI\r
                protocol database\r
**/\r
BOOLEAN\r
VariableHaveTcgProtocols (\r
  VOID\r
  )\r
{\r
  EFI_STATUS            Status;\r
  VOID                  *Interface;\r
\r
  Status = gBS->LocateProtocol (\r
                  &gEfiTcg2ProtocolGuid,\r
                  NULL,                     // Registration\r
                  &Interface\r
                  );\r
  if (!EFI_ERROR (Status)) {\r
    return TRUE;\r
  }\r
\r
  Status = gBS->LocateProtocol (\r
                  &gEfiTcgProtocolGuid,\r
                  NULL,                     // Registration\r
                  &Interface\r
                  );\r
  return !EFI_ERROR (Status);\r
}\r