// This file was extracted from the TCG Published

// Trusted Platform Module Library

// Part 3: Commands

// Family "2.0"

// Level 00 Revision 01.16

// October 30, 2014

#include "InternalRoutines.h"

#include "NV_Increment_fp.h"

#include "NV_spt_fp.h"

//

//

//     Error Returns                   Meaning

//

//     TPM_RC_ATTRIBUTES               NV index is not a counter

//     TPM_RC_NV_AUTHORIZATION         authorization failure

//     TPM_RC_NV_LOCKED                Index is write locked

//

TPM_RC

TPM2_NV_Increment(

   NV_Increment_In       *in                  // IN: input parameter list

   )

{

   TPM_RC            result;

   NV_INDEX          nvIndex;

   UINT64            countValue;

// Input Validation

   // Common access checks, a TPM_RC_NV_AUTHORIZATION or TPM_RC_NV_LOCKED

   // error may be returned at this point

   result = NvWriteAccessChecks(in->authHandle, in->nvIndex);

   if(result != TPM_RC_SUCCESS)

       return result;

   // Check if there are platform-specific reasons to prohibit updating this

   // index.

   if (!_plat__NvUpdateAllowed(in->nvIndex))

       return TPM_RC_NV_AUTHORIZATION;

   // Get NV index info

   NvGetIndexInfo(in->nvIndex, &nvIndex);

   // Make sure that this is a counter

   if(nvIndex.publicArea.attributes.TPMA_NV_COUNTER != SET)

       return TPM_RC_ATTRIBUTES + RC_NV_Increment_nvIndex;

// Internal Data Update

   // If counter index is not been written, initialize it

   if(nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR)

       countValue = NvInitialCounter();

   else

       // Read NV data in native format for TPM CPU.

       NvGetIntIndexData(in->nvIndex, &nvIndex, &countValue);

   // Do the increment

   countValue++;

   // If this is an orderly counter that just rolled over, need to be able to

   // write to NV to proceed. This check is done here, because NvWriteIndexData()

   // does not see if the update is for counter rollover.

   if(    nvIndex.publicArea.attributes.TPMA_NV_ORDERLY == SET

       && (countValue & MAX_ORDERLY_COUNT) == 0)

   {

       result = NvIsAvailable();

       if(result != TPM_RC_SUCCESS)

           return result;

       // Need to force an NV update

       g_updateNV = TRUE;

//

   }

   // Write NV data back. A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may

   // be returned at this point. If necessary, this function will set the

   // TPMA_NV_WRITTEN attribute

   return NvWriteIndexData(in->nvIndex, &nvIndex, 0, 8, &countValue);

}