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/** @file
Implement TPM2 Context related command.
Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#pragma pack(1)
typedef struct {
TPM2_COMMAND_HEADER Header;
TPMI_DH_CONTEXT FlushHandle;
} TPM2_FLUSH_CONTEXT_COMMAND;
typedef struct {
TPM2_RESPONSE_HEADER Header;
} TPM2_FLUSH_CONTEXT_RESPONSE;
#pragma pack()
/**
This command causes all context associated with a loaded object or session to be removed from TPM memory.
@param[in] FlushHandle The handle of the item to flush.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The command was unsuccessful.
**/
EFI_STATUS
EFIAPI
Tpm2FlushContext (
IN TPMI_DH_CONTEXT FlushHandle
)
{
EFI_STATUS Status;
TPM2_FLUSH_CONTEXT_COMMAND SendBuffer;
TPM2_FLUSH_CONTEXT_RESPONSE RecvBuffer;
UINT32 SendBufferSize;
UINT32 RecvBufferSize;
//
// Construct command
//
SendBuffer.Header.tag = SwapBytes16 (TPM_ST_NO_SESSIONS);
SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_FlushContext);
SendBuffer.FlushHandle = SwapBytes32 (FlushHandle);
SendBufferSize = (UINT32)sizeof (SendBuffer);
SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);
//
// send Tpm command
//
RecvBufferSize = sizeof (RecvBuffer);
Status = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
if (EFI_ERROR (Status)) {
return Status;
}
if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
DEBUG ((DEBUG_ERROR, "Tpm2FlushContext - RecvBufferSize Error - %x\n", RecvBufferSize));
return EFI_DEVICE_ERROR;
}
if (SwapBytes32 (RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {
DEBUG ((DEBUG_ERROR, "Tpm2FlushContext - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
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