1 /*
2 * Copyright 2012 IBM Corporation
3 *
4 * Author: Ashley Lai <ashleydlai@gmail.com>
5 *
6 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
7 *
8 * Read the event log created by the firmware on PPC64
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 */
16
17 #include <linux/slab.h>
18 #include <linux/of.h>
19
20 #include "tpm.h"
21 #include "tpm_eventlog.h"
22
read_log(struct tpm_bios_log * log)23 int read_log(struct tpm_bios_log *log)
24 {
25 struct device_node *np;
26 const u32 *sizep;
27 const u64 *basep;
28
29 if (log->bios_event_log != NULL) {
30 pr_err("%s: ERROR - Eventlog already initialized\n", __func__);
31 return -EFAULT;
32 }
33
34 np = of_find_node_by_name(NULL, "vtpm");
35 if (!np) {
36 pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
37 return -ENODEV;
38 }
39
40 sizep = of_get_property(np, "linux,sml-size", NULL);
41 if (sizep == NULL) {
42 pr_err("%s: ERROR - SML size not found\n", __func__);
43 goto cleanup_eio;
44 }
45 if (*sizep == 0) {
46 pr_err("%s: ERROR - event log area empty\n", __func__);
47 goto cleanup_eio;
48 }
49
50 basep = of_get_property(np, "linux,sml-base", NULL);
51 if (basep == NULL) {
52 pr_err("%s: ERROR - SML not found\n", __func__);
53 goto cleanup_eio;
54 }
55
56 log->bios_event_log = kmalloc(*sizep, GFP_KERNEL);
57 if (!log->bios_event_log) {
58 pr_err("%s: ERROR - Not enough memory for BIOS measurements\n",
59 __func__);
60 of_node_put(np);
61 return -ENOMEM;
62 }
63
64 log->bios_event_log_end = log->bios_event_log + *sizep;
65
66 memcpy(log->bios_event_log, __va(*basep), *sizep);
67 of_node_put(np);
68
69 return 0;
70
71 cleanup_eio:
72 of_node_put(np);
73 return -EIO;
74 }
75