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