mirror of https://github.com/acidanthera/audk.git
109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
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/** @file
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Ihis library is TPM12 TCG protocol lib.
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Copyright (c) 2013, Intel Corporation. All rights reserved. <BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.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/UefiBootServicesTableLib.h>
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#include <Library/Tpm12DeviceLib.h>
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#include <Protocol/TcgService.h>
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#include <IndustryStandard/Tpm12.h>
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EFI_TCG_PROTOCOL *mTcgProtocol = NULL;
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/**
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This service enables the sending of commands to the TPM12.
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@param[in] InputParameterBlockSize Size of the TPM12 input parameter block.
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@param[in] InputParameterBlock Pointer to the TPM12 input parameter block.
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@param[in,out] OutputParameterBlockSize Size of the TPM12 output parameter block.
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@param[in] OutputParameterBlock Pointer to the TPM12 output parameter block.
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@retval EFI_SUCCESS The command byte stream was successfully sent to the device and a response was successfully received.
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@retval EFI_DEVICE_ERROR The command was not successfully sent to the device or a response was not successfully received from the device.
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@retval EFI_BUFFER_TOO_SMALL The output parameter block is too small.
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**/
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EFI_STATUS
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EFIAPI
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Tpm12SubmitCommand (
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IN UINT32 InputParameterBlockSize,
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IN UINT8 *InputParameterBlock,
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IN OUT UINT32 *OutputParameterBlockSize,
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IN UINT8 *OutputParameterBlock
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)
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{
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EFI_STATUS Status;
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TPM_RSP_COMMAND_HDR *Header;
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if (mTcgProtocol == NULL) {
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Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &mTcgProtocol);
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if (EFI_ERROR (Status)) {
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//
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// TCG protocol is not installed. So, TPM12 is not present.
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//
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DEBUG ((EFI_D_ERROR, "Tpm12SubmitCommand - TCG - %r\n", Status));
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return EFI_NOT_FOUND;
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}
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}
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//
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// Assume when TCG Protocol is ready, RequestUseTpm already done.
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//
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Status = mTcgProtocol->PassThroughToTpm (
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mTcgProtocol,
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InputParameterBlockSize,
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InputParameterBlock,
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*OutputParameterBlockSize,
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OutputParameterBlock
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Header = (TPM_RSP_COMMAND_HDR *)OutputParameterBlock;
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*OutputParameterBlockSize = SwapBytes32 (Header->paramSize);
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return EFI_SUCCESS;
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}
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/**
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This service requests use TPM12.
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@retval EFI_SUCCESS Get the control of TPM12 chip.
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@retval EFI_NOT_FOUND TPM12 not found.
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@retval EFI_DEVICE_ERROR Unexpected device behavior.
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**/
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EFI_STATUS
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EFIAPI
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Tpm12RequestUseTpm (
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VOID
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)
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{
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EFI_STATUS Status;
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if (mTcgProtocol == NULL) {
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Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &mTcgProtocol);
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if (EFI_ERROR (Status)) {
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//
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// TCG protocol is not installed. So, TPM12 is not present.
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//
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DEBUG ((EFI_D_ERROR, "Tpm12RequestUseTpm - TCG - %r\n", Status));
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return EFI_NOT_FOUND;
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}
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}
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//
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// Assume when TCG Protocol is ready, RequestUseTpm already done.
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//
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return EFI_SUCCESS;
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}
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