| /* |
| * Copyright 2012 IBM Corporation |
| * |
| * Author: Ashley Lai <[email protected]> |
| * |
| * Maintained by: <[email protected]> |
| * |
| * Read the event log created by the firmware on PPC64 |
| * |
| * 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. |
| * |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| |
| #include "tpm.h" |
| #include "tpm_eventlog.h" |
| |
| int read_log(struct tpm_bios_log *log) |
| { |
| struct device_node *np; |
| const u32 *sizep; |
| const __be64 *basep; |
| |
| if (log->bios_event_log != NULL) { |
| pr_err("%s: ERROR - Eventlog already initialized\n", __func__); |
| return -EFAULT; |
| } |
| |
| np = of_find_node_by_name(NULL, "ibm,vtpm"); |
| if (!np) { |
| pr_err("%s: ERROR - IBMVTPM not supported\n", __func__); |
| return -ENODEV; |
| } |
| |
| sizep = of_get_property(np, "linux,sml-size", NULL); |
| if (sizep == NULL) { |
| pr_err("%s: ERROR - SML size not found\n", __func__); |
| goto cleanup_eio; |
| } |
| if (*sizep == 0) { |
| pr_err("%s: ERROR - event log area empty\n", __func__); |
| goto cleanup_eio; |
| } |
| |
| basep = of_get_property(np, "linux,sml-base", NULL); |
| if (basep == NULL) { |
| pr_err(KERN_ERR "%s: ERROR - SML not found\n", __func__); |
| goto cleanup_eio; |
| } |
| |
| of_node_put(np); |
| log->bios_event_log = kmalloc(*sizep, GFP_KERNEL); |
| if (!log->bios_event_log) { |
| pr_err("%s: ERROR - Not enough memory for BIOS measurements\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| log->bios_event_log_end = log->bios_event_log + *sizep; |
| |
| memcpy(log->bios_event_log, __va(be64_to_cpup(basep)), *sizep); |
| |
| return 0; |
| |
| cleanup_eio: |
| of_node_put(np); |
| return -EIO; |
| } |
