55a82ab318
According to the TCG specifications measurements or hashes of the BIOS code and data are extended into TPM PCRS and a log is kept in an ACPI table of these extensions for later validation if desired. This patch exports the values in the ACPI table through a security-fs seq_file. Signed-off-by: Seiji Munetoh <munetoh@jp.ibm.com> Signed-off-by: Stefan Berger <stefanb@us.ibm.com> Signed-off-by: Reiner Sailer <sailer@us.ibm.com> Signed-off-by: Kylene Hall <kjhall@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd_devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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enum tpm_timeout {
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TPM_TIMEOUT = 5, /* msecs */
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};
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/* TPM addresses */
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enum tpm_addr {
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TPM_SUPERIO_ADDR = 0x2E,
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TPM_ADDR = 0x4E,
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};
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extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
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const char *, size_t);
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struct tpm_chip;
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struct tpm_vendor_specific {
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u8 req_complete_mask;
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u8 req_complete_val;
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u8 req_canceled;
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void __iomem *iobase; /* ioremapped address */
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unsigned long base; /* TPM base address */
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int region_size;
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int have_region;
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int (*recv) (struct tpm_chip *, u8 *, size_t);
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int (*send) (struct tpm_chip *, u8 *, size_t);
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void (*cancel) (struct tpm_chip *);
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u8 (*status) (struct tpm_chip *);
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struct miscdevice miscdev;
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struct attribute_group *attr_group;
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};
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struct tpm_chip {
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struct device *dev; /* Device stuff */
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int dev_num; /* /dev/tpm# */
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int num_opens; /* only one allowed */
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int time_expired;
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/* Data passed to and from the tpm via the read/write calls */
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u8 *data_buffer;
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atomic_t data_pending;
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struct semaphore buffer_mutex;
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struct timer_list user_read_timer; /* user needs to claim result */
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struct work_struct work;
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struct semaphore tpm_mutex; /* tpm is processing */
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struct tpm_vendor_specific *vendor;
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struct dentry **bios_dir;
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struct list_head list;
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};
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static inline int tpm_read_index(int base, int index)
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{
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outb(index, base);
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return inb(base+1) & 0xFF;
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}
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static inline void tpm_write_index(int base, int index, int value)
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{
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outb(index, base);
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outb(value & 0xFF, base+1);
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}
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extern int tpm_register_hardware(struct device *,
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struct tpm_vendor_specific *);
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extern int tpm_open(struct inode *, struct file *);
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extern int tpm_release(struct inode *, struct file *);
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extern ssize_t tpm_write(struct file *, const char __user *, size_t,
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loff_t *);
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extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
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extern void tpm_remove_hardware(struct device *);
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extern int tpm_pm_suspend(struct device *, pm_message_t);
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extern int tpm_pm_resume(struct device *);
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#ifdef CONFIG_ACPI
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extern struct dentry ** tpm_bios_log_setup(char *);
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extern void tpm_bios_log_teardown(struct dentry **);
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#else
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static inline struct dentry* tpm_bios_log_setup(char *name)
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{
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return NULL;
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}
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static inline void tpm_bios_log_teardown(struct dentry **dir)
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{
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}
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#endif
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