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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"
// This function is called to process a _TPM_Hash_Start() indication.
TPM_RC result;
// If a DRTM sequence object exists, free it up
// Create an event sequence object and store the handle in global
// g_DRTMHandle. A TPM_RC_OBJECT_MEMORY error may be returned at this point
// The null value for the 'auth' parameter will cause the sequence structure to
// be allocated without being set as present. This keeps the sequence from
// being left behind if the sequence is terminated early.
result = ObjectCreateEventSequence(NULL, &g_DRTMHandle);
// If a free slot was not available, then free up a slot.
if(result != TPM_RC_SUCCESS)
// An implementation does not need to have a fixed relationship between
// slot numbers and handle numbers. To handle the general case, scan for
// a handle that is assigned and free it for the DRTM sequence.
// In the reference implementation, the relationship between handles and
// slots is fixed. So, if the call to ObjectCreateEvenSequence()
// failed indicating that all slots are occupied, then the first handle we
// are going to check (TRANSIENT_FIRST) will be occupied. It will be freed
// so that it can be assigned for use as the DRTM sequence object.
for(handle = TRANSIENT_FIRST; handle < TRANSIENT_LAST; handle++)
// try to flush the first object
// If the first call to find a slot fails but none of the slots is occupied
// then there's a big problem
pAssert(handle < TRANSIENT_LAST);
// Free the slot
// Try to create an event sequence object again. This time, we must
// succeed.
result = ObjectCreateEventSequence(NULL, &g_DRTMHandle);
pAssert(result == TPM_RC_SUCCESS);