diff options
author | Kent Yoder <key@linux.vnet.ibm.com> | 2012-07-11 11:08:12 -0400 |
---|---|---|
committer | Kent Yoder <key@linux.vnet.ibm.com> | 2012-08-22 12:11:25 -0400 |
commit | e5dcd87fee12ed64a9ea911102025facc0c7d10c (patch) | |
tree | 039eb74daff281950e979c888ec9ec760939ad9d /drivers/char/tpm/tpm_acpi.c | |
parent | aad628c1d91a6db57e572e4c1f35e863d81061d7 (diff) |
tpm: modularize event log collection
Break ACPI-specific pieces of the event log handling into their own file
and create tpm_eventlog.[ch] to store common event log handling code.
This will be required to integrate future event log sources on platforms
without ACPI tables.
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char/tpm/tpm_acpi.c')
-rw-r--r-- | drivers/char/tpm/tpm_acpi.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c new file mode 100644 index 000000000000..a1bb5a182df9 --- /dev/null +++ b/drivers/char/tpm/tpm_acpi.c | |||
@@ -0,0 +1,104 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2005 IBM Corporation | ||
3 | * | ||
4 | * Authors: | ||
5 | * Seiji Munetoh <munetoh@jp.ibm.com> | ||
6 | * Stefan Berger <stefanb@us.ibm.com> | ||
7 | * Reiner Sailer <sailer@watson.ibm.com> | ||
8 | * Kylene Hall <kjhall@us.ibm.com> | ||
9 | * | ||
10 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> | ||
11 | * | ||
12 | * Access to the eventlog extended by the TCG BIOS of PC platform | ||
13 | * | ||
14 | * This program is free software; you can redistribute it and/or | ||
15 | * modify it under the terms of the GNU General Public License | ||
16 | * as published by the Free Software Foundation; either version | ||
17 | * 2 of the License, or (at your option) any later version. | ||
18 | * | ||
19 | */ | ||
20 | |||
21 | #include <linux/seq_file.h> | ||
22 | #include <linux/fs.h> | ||
23 | #include <linux/security.h> | ||
24 | #include <linux/module.h> | ||
25 | #include <linux/slab.h> | ||
26 | #include <acpi/acpi.h> | ||
27 | |||
28 | #include "tpm.h" | ||
29 | #include "tpm_eventlog.h" | ||
30 | |||
31 | struct acpi_tcpa { | ||
32 | struct acpi_table_header hdr; | ||
33 | u16 platform_class; | ||
34 | union { | ||
35 | struct client_hdr { | ||
36 | u32 log_max_len __attribute__ ((packed)); | ||
37 | u64 log_start_addr __attribute__ ((packed)); | ||
38 | } client; | ||
39 | struct server_hdr { | ||
40 | u16 reserved; | ||
41 | u64 log_max_len __attribute__ ((packed)); | ||
42 | u64 log_start_addr __attribute__ ((packed)); | ||
43 | } server; | ||
44 | }; | ||
45 | }; | ||
46 | |||
47 | /* read binary bios log */ | ||
48 | int read_log(struct tpm_bios_log *log) | ||
49 | { | ||
50 | struct acpi_tcpa *buff; | ||
51 | acpi_status status; | ||
52 | struct acpi_table_header *virt; | ||
53 | u64 len, start; | ||
54 | |||
55 | if (log->bios_event_log != NULL) { | ||
56 | printk(KERN_ERR | ||
57 | "%s: ERROR - Eventlog already initialized\n", | ||
58 | __func__); | ||
59 | return -EFAULT; | ||
60 | } | ||
61 | |||
62 | /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */ | ||
63 | status = acpi_get_table(ACPI_SIG_TCPA, 1, | ||
64 | (struct acpi_table_header **)&buff); | ||
65 | |||
66 | if (ACPI_FAILURE(status)) { | ||
67 | printk(KERN_ERR "%s: ERROR - Could not get TCPA table\n", | ||
68 | __func__); | ||
69 | return -EIO; | ||
70 | } | ||
71 | |||
72 | switch(buff->platform_class) { | ||
73 | case BIOS_SERVER: | ||
74 | len = buff->server.log_max_len; | ||
75 | start = buff->server.log_start_addr; | ||
76 | break; | ||
77 | case BIOS_CLIENT: | ||
78 | default: | ||
79 | len = buff->client.log_max_len; | ||
80 | start = buff->client.log_start_addr; | ||
81 | break; | ||
82 | } | ||
83 | if (!len) { | ||
84 | printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__); | ||
85 | return -EIO; | ||
86 | } | ||
87 | |||
88 | /* malloc EventLog space */ | ||
89 | log->bios_event_log = kmalloc(len, GFP_KERNEL); | ||
90 | if (!log->bios_event_log) { | ||
91 | printk("%s: ERROR - Not enough Memory for BIOS measurements\n", | ||
92 | __func__); | ||
93 | return -ENOMEM; | ||
94 | } | ||
95 | |||
96 | log->bios_event_log_end = log->bios_event_log + len; | ||
97 | |||
98 | virt = acpi_os_map_memory(start, len); | ||
99 | |||
100 | memcpy(log->bios_event_log, virt, len); | ||
101 | |||
102 | acpi_os_unmap_memory(virt, len); | ||
103 | return 0; | ||
104 | } | ||