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