1 /*
2  * Copyright (c) 2010-2012 United States Government, as represented by
3  * the Secretary of Defense.  All rights reserved.
4  *
5  * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
6  * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
7  * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
8  * FOR A PARTICULAR  PURPOSE, AND NONINFRINGEMENT ARE HEREBY
9  * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
10  * SOFTWARE.
11  */
12 
13 #include "vtpm_pcrs.h"
14 #include "vtpm_cmd.h"
15 #include "tpm/tpm_data.h"
16 
17 #define PCR_VALUE      tpmData.permanent.data.pcrValue
18 
write_pcr_direct(unsigned int pcrIndex,uint8_t * val)19 static int write_pcr_direct(unsigned int pcrIndex, uint8_t* val) {
20    if(pcrIndex > TPM_NUM_PCR) {
21       return TPM_BADINDEX;
22    }
23    memcpy(&PCR_VALUE[pcrIndex], val, sizeof(TPM_PCRVALUE));
24    return TPM_SUCCESS;
25 }
26 
vtpm_initialize_hw_pcrs(struct tpmfront_dev * tpmfront_dev,unsigned long pcrs)27 TPM_RESULT vtpm_initialize_hw_pcrs(struct tpmfront_dev* tpmfront_dev, unsigned long pcrs)
28 {
29    TPM_RESULT rc = TPM_SUCCESS;
30    uint8_t digest[sizeof(TPM_PCRVALUE)];
31 
32    for(unsigned int i = 0; i < TPM_NUM_PCR; ++i) {
33       if(pcrs & 1 << i) {
34          if((rc = VTPM_PCRRead(tpmfront_dev, i, digest)) != TPM_SUCCESS) {
35             error("TPM_PCRRead failed with error : %d", rc);
36             return rc;
37          }
38          write_pcr_direct(i, digest);
39       }
40    }
41 
42    return rc;
43 }
44