2 * Copyright (C) 2005 IBM Corporation
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 * Nayna Jain <nayna@linux.vnet.ibm.com>
11 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
13 * Access to the event log extended by the TCG BIOS of PC platform
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
22 #include <linux/seq_file.h>
24 #include <linux/security.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/acpi.h>
30 #include "tpm_eventlog.h"
33 struct acpi_table_header hdr
;
37 u32 log_max_len __packed
;
38 u64 log_start_addr __packed
;
42 u64 log_max_len __packed
;
43 u64 log_start_addr __packed
;
48 /* read binary bios log */
49 int tpm_read_log_acpi(struct tpm_chip
*chip
)
51 struct acpi_tcpa
*buff
;
55 struct tpm_bios_log
*log
;
57 if (chip
->flags
& TPM_CHIP_FLAG_TPM2
)
62 /* Unfortuntely ACPI does not associate the event log with a specific
63 * TPM, like PPI. Thus all ACPI TPMs will read the same log.
65 if (!chip
->acpi_dev_handle
)
68 /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
69 status
= acpi_get_table(ACPI_SIG_TCPA
, 1,
70 (struct acpi_table_header
**)&buff
);
72 if (ACPI_FAILURE(status
))
75 switch(buff
->platform_class
) {
77 len
= buff
->server
.log_max_len
;
78 start
= buff
->server
.log_start_addr
;
82 len
= buff
->client
.log_max_len
;
83 start
= buff
->client
.log_start_addr
;
87 dev_warn(&chip
->dev
, "%s: TCPA log area empty\n", __func__
);
91 /* malloc EventLog space */
92 log
->bios_event_log
= kmalloc(len
, GFP_KERNEL
);
93 if (!log
->bios_event_log
)
96 log
->bios_event_log_end
= log
->bios_event_log
+ len
;
98 virt
= acpi_os_map_iomem(start
, len
);
102 memcpy_fromio(log
->bios_event_log
, virt
, len
);
104 acpi_os_unmap_iomem(virt
, len
);
108 kfree(log
->bios_event_log
);
109 log
->bios_event_log
= NULL
;