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
23int 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
71cleanup_eio:
72	of_node_put(np);
73	return -EIO;
74}
75