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https://github.com/tianocore/edk2
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ee9950d3fb
This is preparation patch to add Tpm2DeviceSecLibFfa for SEC used in PeilessSec. In SEC phase, DynamicPcd used for cacahing TPM2 information couldn't be used. To resolve this, writes wrapper functions to get TPM2 information so that in the wrapper functions used in SEC wouldn't use the related DyanmicPcd. Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/** @file
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This library provides an implementation of Tpm2DeviceLib
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using ARM64 SMC calls to request TPM service.
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The implementation is only supporting the Command Response Buffer (CRB)
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for sharing data with the TPM.
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Copyright (c), Microsoft Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <IndustryStandard/ArmFfaSvc.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/Tpm2DeviceLib.h>
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#include <IndustryStandard/ArmStdSmc.h>
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#include <IndustryStandard/Tpm20.h>
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#include <Library/TimerLib.h>
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#include "Tpm2DeviceLibFfa.h"
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UINT8 mCRBIdleByPass;
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/**
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Return cached PTP CRB interface IdleByPass state.
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@return Cached PTP CRB interface IdleByPass state.
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**/
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UINT8
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GetCachedIdleByPass (
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VOID
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)
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{
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return mCRBIdleByPass;
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}
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/**
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Check that we have an address for the CRB
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@retval EFI_SUCCESS The entry point is executed successfully.
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@retval EFI_NO_MAPPING The TPM base address is not set up.
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@retval EFI_UNSUPPORTED The TPM interface type is not supported.
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**/
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EFI_STATUS
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EFIAPI
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InternalTpm2DeviceLibFfaConstructor (
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VOID
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)
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{
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EFI_STATUS Status;
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mCRBIdleByPass = 0xFF;
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if (PcdGet64 (PcdTpmBaseAddress) == 0) {
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Status = EFI_NO_MAPPING;
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goto Exit;
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}
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Status = ValidateTpmInterfaceType ();
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if (EFI_ERROR (Status)) {
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goto Exit;
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}
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mCRBIdleByPass = Tpm2GetIdleByPass ((VOID *)(UINTN)PcdGet64 (PcdTpmBaseAddress));
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Status = EFI_SUCCESS;
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Exit:
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return Status;
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}
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