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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
109 lines
2.3 KiB
C
109 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2005 IBM Corporation
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*
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* Authors:
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* Seiji Munetoh <munetoh@jp.ibm.com>
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* Stefan Berger <stefanb@us.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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* Nayna Jain <nayna@linux.vnet.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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* Access to the event log extended by the TCG BIOS of PC platform
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*/
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/security.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/tpm_eventlog.h>
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#include "../tpm.h"
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#include "common.h"
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struct acpi_tcpa {
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struct acpi_table_header hdr;
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u16 platform_class;
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union {
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struct client_hdr {
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u32 log_max_len __packed;
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u64 log_start_addr __packed;
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} client;
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struct server_hdr {
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u16 reserved;
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u64 log_max_len __packed;
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u64 log_start_addr __packed;
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} server;
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};
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};
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/* read binary bios log */
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int tpm_read_log_acpi(struct tpm_chip *chip)
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{
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struct acpi_tcpa *buff;
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acpi_status status;
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void __iomem *virt;
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u64 len, start;
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struct tpm_bios_log *log;
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return -ENODEV;
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log = &chip->log;
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/* Unfortuntely ACPI does not associate the event log with a specific
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* TPM, like PPI. Thus all ACPI TPMs will read the same log.
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*/
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if (!chip->acpi_dev_handle)
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return -ENODEV;
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/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
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status = acpi_get_table(ACPI_SIG_TCPA, 1,
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(struct acpi_table_header **)&buff);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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switch(buff->platform_class) {
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case BIOS_SERVER:
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len = buff->server.log_max_len;
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start = buff->server.log_start_addr;
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break;
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case BIOS_CLIENT:
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default:
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len = buff->client.log_max_len;
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start = buff->client.log_start_addr;
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break;
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}
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if (!len) {
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dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
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return -EIO;
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}
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/* malloc EventLog space */
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log->bios_event_log = kmalloc(len, GFP_KERNEL);
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if (!log->bios_event_log)
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return -ENOMEM;
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log->bios_event_log_end = log->bios_event_log + len;
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virt = acpi_os_map_iomem(start, len);
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if (!virt)
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goto err;
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memcpy_fromio(log->bios_event_log, virt, len);
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acpi_os_unmap_iomem(virt, len);
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return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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err:
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kfree(log->bios_event_log);
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log->bios_event_log = NULL;
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return -EIO;
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}
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