1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 *
5 * Temporary fix for running the TPM selftest and other essential
6 * intializations that we forgot to put in the BIOS.
7 *
8 * This works in a very specific situation: we assume TPM_Startup has been
9 * executed, but we don't know if the self test has run. On a ST TPM version
10 * 1.2.7.0, GetCapabilities fails before the self test has run, so we use that
11 * to check if we need to run it.
12 *
13 * This also enables the TPM if it is disabled, and activates it if it is
14 * deactivated.
15 *
16 * Exit status always 0. Prints "reboot" to request reboot, "fail" for errors,
17 * "success" when everything worked.
18 */
19
20 #include <stdint.h>
21 #include <stdio.h>
22 #include <syslog.h>
23
24 #include "tlcl.h"
25
main(int argc,char * argv[])26 int main(int argc, char* argv[]) {
27 uint32_t result;
28 uint8_t disable, deactivated;
29 int pri = LOG_USER | LOG_ERR;
30
31 TlclLibInit();
32 TlclStartup(); /* ignore result */
33
34 /* On the dogfood device, GetFlags causes an assertion failure because the
35 * device uses an older TPM which is not compatible with the current spec.
36 * We take advantage of this to cause the program to exit and not run the
37 * self test again (which takes 1 second).
38 */
39 result = TlclGetFlags(NULL, NULL, NULL);
40
41 result = TlclSelfTestFull();
42 if (result != 0) {
43 syslog(pri, "TPM selftest failed with code 0x%x\n", result);
44 printf("fail\n");
45 return 0;
46 }
47
48 /* Optional one-time enabling of TPM. */
49 result = TlclAssertPhysicalPresence();
50 if (result != 0) {
51 syslog(pri, "TPM assertpp failed with code 0x%x\n", result);
52 printf("fail\n");
53 return 0;
54 }
55 result = TlclGetFlags(&disable, &deactivated, NULL);
56 if (result != 0) {
57 syslog(pri, "TPM getflags failed with code 0x%x\n", result);
58 printf("fail\n");
59 return 0;
60 }
61 if (disable) {
62 result = TlclSetEnable();
63 if (result != 0) {
64 syslog(pri, "TPM physical enable failed with code 0x%x\n", result);
65 printf("fail\n");
66 return 0;
67 }
68 }
69 if (deactivated) {
70 result = TlclSetDeactivated(0);
71 if (result != 0) {
72 syslog(pri, "TPM physical activate failed with code 0x%x\n", result);
73 printf("fail\n");
74 } else {
75 printf("reboot\n");
76 }
77 return 0; /* needs reboot */
78 }
79 printf("success\n");
80 return 0;
81 }
82