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