UefiCpuPkg CpuCommFeaturesLib: Fix GP fault issue about ProcTrace

[mirror_edk2.git] / OvmfPkg / IoMmuDxe / IoMmuDxe.c

/** @file\r
\r
  IoMmuDxe driver installs EDKII_IOMMU_PROTOCOL to provide the support for DMA\r
  operations when SEV is enabled.\r
\r
  Copyright (c) 2017, AMD Inc. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "AmdSevIoMmu.h"\r
\r
EFI_STATUS\r
EFIAPI\r
IoMmuDxeEntryPoint (\r
  IN EFI_HANDLE         ImageHandle,\r
  IN EFI_SYSTEM_TABLE   *SystemTable\r
  )\r
{\r
  EFI_STATUS    Status;\r
  EFI_HANDLE    Handle;\r
\r
  //\r
  // When SEV is enabled, install IoMmu protocol otherwise install the\r
  // placeholder protocol so that other dependent module can run.\r
  //\r
  if (MemEncryptSevIsEnabled ()) {\r
    Status = AmdSevInstallIoMmuProtocol ();\r
  } else {\r
    Handle = NULL;\r
\r
    Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &Handle,\r
                  &gIoMmuAbsentProtocolGuid,\r
                  NULL, NULL);\r
  }\r
\r
  return Status;\r
}\r