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// 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;
// 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);
}
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