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c5df3926 AL |
1 | /* |
2 | * Copyright 2012 IBM Corporation | |
3 | * | |
1a0f1b27 | 4 | * Author: Ashley Lai <ashleydlai@gmail.com> |
c5df3926 AL |
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 | ||
23 | int read_log(struct tpm_bios_log *log) | |
24 | { | |
25 | struct device_node *np; | |
26 | const u32 *sizep; | |
27 | const __be64 *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, "ibm,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) { | |
84e3b420 | 52 | pr_err("%s: ERROR - SML not found\n", __func__); |
c5df3926 AL |
53 | goto cleanup_eio; |
54 | } | |
55 | ||
56 | of_node_put(np); | |
57 | log->bios_event_log = kmalloc(*sizep, GFP_KERNEL); | |
58 | if (!log->bios_event_log) { | |
59 | pr_err("%s: ERROR - Not enough memory for BIOS measurements\n", | |
60 | __func__); | |
61 | return -ENOMEM; | |
62 | } | |
63 | ||
64 | log->bios_event_log_end = log->bios_event_log + *sizep; | |
65 | ||
66 | memcpy(log->bios_event_log, __va(be64_to_cpup(basep)), *sizep); | |
67 | ||
68 | return 0; | |
69 | ||
70 | cleanup_eio: | |
71 | of_node_put(np); | |
72 | return -EIO; | |
73 | } |