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/** @file
Implement TPM2 Context related command.
Copyright (c) 2014, Intel Corporation. All rights reserved. <BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#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 ((EFI_D_ERROR, "Tpm2FlushContext - RecvBufferSize Error - %x\n", RecvBufferSize));
return EFI_DEVICE_ERROR;
}
if (SwapBytes32(RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {
DEBUG ((EFI_D_ERROR, "Tpm2FlushContext - responseCode - %x\n", SwapBytes32(RecvBuffer.Header.responseCode)));
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
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