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/** @file
CcProbeLib is used to probe the Confidential computing guest type.
Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi/UefiBaseType.h>
#include <Library/CcProbeLib.h>
#include <WorkArea.h>
STATIC UINT8 mCcProbeGuestType = 0;
STATIC BOOLEAN mCcProbed = FALSE;
/**
* Read the the ConfidentialComputing Guest type from Ovmf work-area.
*
* @return The ConfidentialComputing Guest type
*/
STATIC
UINT8
ReadCcGuestType (
VOID
)
{
OVMF_WORK_AREA *WorkArea;
if (!mCcProbed) {
WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
mCcProbeGuestType = WorkArea != NULL ? WorkArea->Header.GuestType : CcGuestTypeNonEncrypted;
mCcProbed = TRUE;
}
return mCcProbeGuestType;
}
/**
Probe the ConfidentialComputing Guest type. See defition of
CC_GUEST_TYPE in <ConfidentialComputingGuestAttr.h>.
@return The guest type
**/
UINT8
EFIAPI
CcProbe (
VOID
)
{
return ReadCcGuestType ();
}
/**
* Constructor of DxeCcProbeLib
*
* @return EFI_SUCCESS Successfully called of constructor
*/
EFI_STATUS
EFIAPI
DxeCcProbeLibConstructor (
VOID
)
{
ReadCcGuestType ();
return EFI_SUCCESS;
}
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