diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/SecurityPkg/Library/Tpm2CommandLib/Tpm2Context.c')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/SecurityPkg/Library/Tpm2CommandLib/Tpm2Context.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/SecurityPkg/Library/Tpm2CommandLib/Tpm2Context.c b/src/VBox/Devices/EFI/Firmware/SecurityPkg/Library/Tpm2CommandLib/Tpm2Context.c new file mode 100644 index 00000000..101f51eb --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/SecurityPkg/Library/Tpm2CommandLib/Tpm2Context.c @@ -0,0 +1,80 @@ +/** @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 ((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; +} + |