/** @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 "CcIoMmu.h" | |
EFI_STATUS | |
EFIAPI | |
IoMmuDxeEntryPoint ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_HANDLE Handle; | |
// | |
// When SEV or TDX is enabled, install IoMmu protocol otherwise install the | |
// placeholder protocol so that other dependent module can run. | |
// | |
if (MemEncryptSevIsEnabled () || MemEncryptTdxIsEnabled ()) { | |
Status = InstallIoMmuProtocol (); | |
} else { | |
Handle = NULL; | |
Status = gBS->InstallMultipleProtocolInterfaces ( | |
&Handle, | |
&gIoMmuAbsentProtocolGuid, | |
NULL, | |
NULL | |
); | |
} | |
return Status; | |
} |