77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
// This file was extracted from the TCG Published
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// Trusted Platform Module Library
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// Part 3: Commands
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// Family "2.0"
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// Level 00 Revision 01.16
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// October 30, 2014
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#include "InternalRoutines.h"
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#include "NV_SetBits_fp.h"
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#include "NV_spt_fp.h"
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//
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//
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// Error Returns Meaning
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//
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// TPM_RC_ATTRIBUTES the TPMA_NV_BITS attribute is not SET in the Index referenced by
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// nvIndex
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// TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is
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// not allowed to write to the Index referenced by nvIndex
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// TPM_RC_NV_LOCKED the Index referenced by nvIndex is locked for writing
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//
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TPM_RC
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TPM2_NV_SetBits(
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NV_SetBits_In *in // IN: input parameter list
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)
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{
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TPM_RC result;
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NV_INDEX nvIndex;
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UINT64 oldValue;
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UINT64 newValue;
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// Input Validation
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// Common access checks, NvWriteAccessCheck() may return TPM_RC_NV_AUTHORIZATION
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// or TPM_RC_NV_LOCKED
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// error may be returned at this point
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result = NvWriteAccessChecks(in->authHandle, in->nvIndex);
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if(result != TPM_RC_SUCCESS)
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return result;
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// Get NV index info
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NvGetIndexInfo(in->nvIndex, &nvIndex);
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// Make sure that this is a bit field
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if(nvIndex.publicArea.attributes.TPMA_NV_BITS != SET)
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return TPM_RC_ATTRIBUTES + RC_NV_SetBits_nvIndex;
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// If index is not been written, initialize it
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if(nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR)
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oldValue = 0;
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else
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// Read index data
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NvGetIntIndexData(in->nvIndex, &nvIndex, &oldValue);
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// Figure out what the new value is going to be
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newValue = oldValue | in->bits;
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// If the Index is not-orderly and it has changed, or if this is the first
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// write, NV will need to be updated.
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if( ( nvIndex.publicArea.attributes.TPMA_NV_ORDERLY == CLEAR
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&& newValue != oldValue)
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|| nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR)
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{
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// Internal Data Update
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// Check if NV is available. NvIsAvailable may return TPM_RC_NV_UNAVAILABLE
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// TPM_RC_NV_RATE or TPM_RC_SUCCESS.
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result = NvIsAvailable();
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if(result != TPM_RC_SUCCESS)
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return result;
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// Write index data back. If necessary, this function will SET
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// TPMA_NV_WRITTEN.
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result = NvWriteIndexData(in->nvIndex, &nvIndex, 0, 8, &newValue);
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}
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return result;
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}
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