mirror of https://github.com/acidanthera/audk.git
138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/** @file
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This library is TPM2 device router. Platform can register multi TPM2 instance to it
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via PcdTpmInstanceGuid. Platform need make choice that which one will be final one.
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At most one TPM2 instance can be finally registered, and other will return unsupported.
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Copyright (c) 2013 - 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 <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/HobLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <Library/Tpm2DeviceLib.h>
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EFI_GUID mInternalTpm2DeviceInterfaceGuid = {
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0x349cf818, 0xc0ba, 0x4c43, { 0x92, 0x9a, 0xc8, 0xa1, 0xb1, 0xb3, 0xd2, 0x55 }
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};
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/**
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This function get TPM2.0 interface.
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@retval TPM2.0 interface.
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**/
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TPM2_DEVICE_INTERFACE *
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InternalGetTpm2DeviceInterface (
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VOID
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)
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{
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EFI_HOB_GUID_TYPE *Hob;
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Hob = GetFirstGuidHob (&mInternalTpm2DeviceInterfaceGuid);
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if (Hob == NULL) {
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return NULL;
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}
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return (TPM2_DEVICE_INTERFACE *)(Hob + 1);
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}
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/**
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This service enables the sending of commands to the TPM2.
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@param[in] InputParameterBlockSize Size of the TPM2 input parameter block.
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@param[in] InputParameterBlock Pointer to the TPM2 input parameter block.
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@param[in,out] OutputParameterBlockSize Size of the TPM2 output parameter block.
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@param[in] OutputParameterBlock Pointer to the TPM2 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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Tpm2SubmitCommand (
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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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TPM2_DEVICE_INTERFACE *Tpm2DeviceInterface;
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Tpm2DeviceInterface = InternalGetTpm2DeviceInterface ();
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if (Tpm2DeviceInterface == NULL) {
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return EFI_UNSUPPORTED;
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}
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return Tpm2DeviceInterface->Tpm2SubmitCommand (
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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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}
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/**
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This service requests use TPM2.
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@retval EFI_SUCCESS Get the control of TPM2 chip.
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@retval EFI_NOT_FOUND TPM2 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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Tpm2RequestUseTpm (
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VOID
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)
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{
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TPM2_DEVICE_INTERFACE *Tpm2DeviceInterface;
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Tpm2DeviceInterface = InternalGetTpm2DeviceInterface ();
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if (Tpm2DeviceInterface == NULL) {
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return EFI_UNSUPPORTED;
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}
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return Tpm2DeviceInterface->Tpm2RequestUseTpm ();
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}
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/**
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This service register TPM2 device.
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@param Tpm2Device TPM2 device
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@retval EFI_SUCCESS This TPM2 device is registered successfully.
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@retval EFI_UNSUPPORTED System does not support register this TPM2 device.
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@retval EFI_ALREADY_STARTED System already register this TPM2 device.
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**/
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EFI_STATUS
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EFIAPI
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Tpm2RegisterTpm2DeviceLib (
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IN TPM2_DEVICE_INTERFACE *Tpm2Device
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)
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{
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TPM2_DEVICE_INTERFACE *Tpm2DeviceInterface;
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if (!CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &Tpm2Device->ProviderGuid)){
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DEBUG ((DEBUG_WARN, "WARNING: Tpm2RegisterTpm2DeviceLib - does not support %g registration\n", &Tpm2Device->ProviderGuid));
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return EFI_UNSUPPORTED;
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}
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Tpm2DeviceInterface = InternalGetTpm2DeviceInterface ();
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if (Tpm2DeviceInterface != NULL) {
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//
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// In PEI phase, there will be shadow driver dispatched again.
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//
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DEBUG ((EFI_D_INFO, "Tpm2RegisterTpm2DeviceLib - Override\n"));
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CopyMem (Tpm2DeviceInterface, Tpm2Device, sizeof(*Tpm2Device));
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return EFI_SUCCESS;
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} else {
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Tpm2Device = BuildGuidDataHob (&mInternalTpm2DeviceInterfaceGuid, Tpm2Device, sizeof(*Tpm2Device));
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if (Tpm2Device != NULL) {
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return EFI_SUCCESS;
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} else {
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return EFI_OUT_OF_RESOURCES;
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}
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}
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}
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