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c5df3926 AL |
1 | /* |
2 | * Copyright 2012 IBM Corporation | |
3 | * | |
1a0f1b27 | 4 | * Author: Ashley Lai <ashleydlai@gmail.com> |
02ae1382 | 5 | * Nayna Jain <nayna@linux.vnet.ibm.com> |
c5df3926 AL |
6 | * |
7 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> | |
8 | * | |
9 | * Read the event log created by the firmware on PPC64 | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/slab.h> | |
19 | #include <linux/of.h> | |
20 | ||
21 | #include "tpm.h" | |
22 | #include "tpm_eventlog.h" | |
23 | ||
02ae1382 | 24 | int tpm_read_log_of(struct tpm_chip *chip) |
c5df3926 AL |
25 | { |
26 | struct device_node *np; | |
27 | const u32 *sizep; | |
d72c3911 | 28 | const u64 *basep; |
748935ee | 29 | struct tpm_bios_log *log; |
c5df3926 | 30 | |
748935ee | 31 | log = &chip->log; |
0cf577a0 | 32 | if (chip->dev.parent && chip->dev.parent->of_node) |
ed4fdb4f | 33 | np = chip->dev.parent->of_node; |
79eec5b9 | 34 | else |
c5df3926 | 35 | return -ENODEV; |
c5df3926 AL |
36 | |
37 | sizep = of_get_property(np, "linux,sml-size", NULL); | |
0cf577a0 JG |
38 | basep = of_get_property(np, "linux,sml-base", NULL); |
39 | if (sizep == NULL && basep == NULL) | |
40 | return -ENODEV; | |
41 | if (sizep == NULL || basep == NULL) | |
5efae7d6 NJ |
42 | return -EIO; |
43 | ||
c5df3926 | 44 | if (*sizep == 0) { |
5efae7d6 NJ |
45 | dev_warn(&chip->dev, "%s: Event log area empty\n", __func__); |
46 | return -EIO; | |
c5df3926 AL |
47 | } |
48 | ||
c5df3926 | 49 | log->bios_event_log = kmalloc(*sizep, GFP_KERNEL); |
5efae7d6 | 50 | if (!log->bios_event_log) |
c5df3926 | 51 | return -ENOMEM; |
c5df3926 AL |
52 | |
53 | log->bios_event_log_end = log->bios_event_log + *sizep; | |
54 | ||
d72c3911 | 55 | memcpy(log->bios_event_log, __va(*basep), *sizep); |
c5df3926 AL |
56 | |
57 | return 0; | |
c5df3926 | 58 | } |