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/** @file
Utility functions used by TPM Dxe driver.
Copyright (c) 2005 - 2013, 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/Tpm12.h>
#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/TpmCommLib.h>
#include <Library/BaseMemoryLib.h>
#include "TpmComm.h"
/**
Extend a TPM PCR.
@param[in] TpmHandle TPM handle.
@param[in] DigestToExtend The 160 bit value representing the event to be recorded.
@param[in] PcrIndex The PCR to be updated.
@param[out] NewPcrValue New PCR value after extend.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The command was unsuccessful.
**/
EFI_STATUS
TpmCommExtend (
IN TIS_TPM_HANDLE TpmHandle,
IN TPM_DIGEST *DigestToExtend,
IN TPM_PCRINDEX PcrIndex,
OUT TPM_DIGEST *NewPcrValue
)
{
EFI_STATUS Status;
TPM_DIGEST NewValue;
TPM_RQU_COMMAND_HDR CmdHdr;
TPM_RSP_COMMAND_HDR RspHdr;
if (NewPcrValue == NULL) {
NewPcrValue = &NewValue;
}
CmdHdr.tag = TPM_TAG_RQU_COMMAND;
CmdHdr.paramSize =
sizeof (CmdHdr) + sizeof (PcrIndex) + sizeof (*DigestToExtend);
CmdHdr.ordinal = TPM_ORD_Extend;
Status = TisPcExecute (
TpmHandle,
"%h%d%r%/%h%r",
&CmdHdr,
PcrIndex,
DigestToExtend,
(UINTN)sizeof (*DigestToExtend),
&RspHdr,
NewPcrValue,
(UINTN)sizeof (*NewPcrValue)
);
if (EFI_ERROR (Status)) {
return Status;
}
if (RspHdr.returnCode != 0) {
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
/**
Get TPM capability flags.
@param[in] TpmHandle TPM handle.
@param[in] FlagSubcap Flag subcap.
@param[out] FlagBuffer Pointer to the buffer for returned flag structure.
@param[in] FlagSize Size of the buffer.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The command was unsuccessful.
**/
EFI_STATUS
TpmCommGetFlags (
IN TIS_TPM_HANDLE TpmHandle,
IN UINT32 FlagSubcap,
OUT VOID *FlagBuffer,
IN UINTN FlagSize
)
{
EFI_STATUS Status;
TPM_RQU_COMMAND_HDR CmdHdr;
TPM_RSP_COMMAND_HDR RspHdr;
UINT32 Size;
CmdHdr.tag = TPM_TAG_RQU_COMMAND;
CmdHdr.paramSize = sizeof (CmdHdr) + sizeof (UINT32) * 3;
CmdHdr.ordinal = TPM_ORD_GetCapability;
Status = TisPcExecute (
TpmHandle,
"%h%d%d%d%/%h%d%r",
&CmdHdr,
TPM_CAP_FLAG,
sizeof (FlagSubcap),
FlagSubcap,
&RspHdr,
&Size,
FlagBuffer,
FlagSize
);
if (EFI_ERROR (Status)) {
return Status;
}
if (RspHdr.returnCode != 0) {
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
/**
Add a new entry to the Event Log.
@param[in, out] EventLogPtr Pointer to the Event Log data.
@param[in, out] LogSize Size of the Event Log.
@param[in] MaxSize Maximum size of the Event Log.
@param[in] NewEventHdr Pointer to a TCG_PCR_EVENT_HDR data structure.
@param[in] NewEventData Pointer to the new event data.
@retval EFI_SUCCESS The new event log entry was added.
@retval EFI_OUT_OF_RESOURCES No enough memory to log the new event.
**/
EFI_STATUS
TpmCommLogEvent (
IN OUT UINT8 **EventLogPtr,
IN OUT UINTN *LogSize,
IN UINTN MaxSize,
IN TCG_PCR_EVENT_HDR *NewEventHdr,
IN UINT8 *NewEventData
)
{
UINTN NewLogSize;
//
// Prevent Event Overflow
//
if (NewEventHdr->EventSize > (UINTN)(~0) - sizeof (*NewEventHdr)) {
return EFI_OUT_OF_RESOURCES;
}
NewLogSize = sizeof (*NewEventHdr) + NewEventHdr->EventSize;
if (NewLogSize > MaxSize - *LogSize) {
return EFI_OUT_OF_RESOURCES;
}
*EventLogPtr += *LogSize;
*LogSize += NewLogSize;
CopyMem (*EventLogPtr, NewEventHdr, sizeof (*NewEventHdr));
CopyMem (
*EventLogPtr + sizeof (*NewEventHdr),
NewEventData,
NewEventHdr->EventSize
);
return EFI_SUCCESS;
}
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