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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_SetBits_fp.h"
#include "NV_spt_fp.h"
//
//
// Error Returns Meaning
//
// TPM_RC_ATTRIBUTES the TPMA_NV_BITS attribute is not SET in the Index referenced by
// nvIndex
// TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is
// not allowed to write to the Index referenced by nvIndex
// TPM_RC_NV_LOCKED the Index referenced by nvIndex is locked for writing
//
TPM_RC
TPM2_NV_SetBits(
NV_SetBits_In *in // IN: input parameter list
)
{
TPM_RC result;
NV_INDEX nvIndex;
UINT64 oldValue;
UINT64 newValue;
// Input Validation
// Common access checks, NvWriteAccessCheck() may return 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 bit field
if(nvIndex.publicArea.attributes.TPMA_NV_BITS != SET)
return TPM_RC_ATTRIBUTES + RC_NV_SetBits_nvIndex;
// If index is not been written, initialize it
if(nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR)
oldValue = 0;
else
// Read index data
NvGetIntIndexData(in->nvIndex, &nvIndex, &oldValue);
// Figure out what the new value is going to be
newValue = oldValue | in->bits;
// If the Index is not-orderly and it has changed, or if this is the first
// write, NV will need to be updated.
if( ( nvIndex.publicArea.attributes.TPMA_NV_ORDERLY == CLEAR
&& newValue != oldValue)
|| nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR)
{
// Internal Data Update
// Check if NV is available. NvIsAvailable may return TPM_RC_NV_UNAVAILABLE
// TPM_RC_NV_RATE or TPM_RC_SUCCESS.
result = NvIsAvailable();
if(result != TPM_RC_SUCCESS)
return result;
// Write index data back. If necessary, this function will SET
// TPMA_NV_WRITTEN.
result = NvWriteIndexData(in->nvIndex, &nvIndex, 0, 8, &newValue);
}
return result;
}
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