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/** @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;
}
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