Linux Kernel  3.7.1
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tpm_of.c
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1 /*
2  * Copyright 2012 IBM Corporation
3  *
4  * Author: Ashley Lai <[email protected]>
5  *
6  * Maintained by: <[email protected]>
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 
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) {
52  pr_err(KERN_ERR "%s: ERROR - SML not found\n", __func__);
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 }