/*
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* Copyright 2012 IBM Corporation
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*
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* Author: Ashley Lai <ashleydlai@gmail.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Read the event log created by the firmware on PPC64
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/slab.h>
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#include <linux/of.h>
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#include "tpm.h"
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#include "tpm_eventlog.h"
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int read_log(struct tpm_bios_log *log)
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{
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struct device_node *np;
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const u32 *sizep;
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const u64 *basep;
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if (log->bios_event_log != NULL) {
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pr_err("%s: ERROR - Eventlog already initialized\n", __func__);
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return -EFAULT;
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}
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np = of_find_node_by_name(NULL, "vtpm");
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if (!np) {
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pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
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return -ENODEV;
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}
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sizep = of_get_property(np, "linux,sml-size", NULL);
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if (sizep == NULL) {
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pr_err("%s: ERROR - SML size not found\n", __func__);
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goto cleanup_eio;
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}
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if (*sizep == 0) {
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pr_err("%s: ERROR - event log area empty\n", __func__);
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goto cleanup_eio;
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}
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basep = of_get_property(np, "linux,sml-base", NULL);
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if (basep == NULL) {
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pr_err("%s: ERROR - SML not found\n", __func__);
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goto cleanup_eio;
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}
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log->bios_event_log = kmalloc(*sizep, GFP_KERNEL);
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if (!log->bios_event_log) {
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pr_err("%s: ERROR - Not enough memory for BIOS measurements\n",
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__func__);
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of_node_put(np);
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return -ENOMEM;
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}
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log->bios_event_log_end = log->bios_event_log + *sizep;
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memcpy(log->bios_event_log, __va(*basep), *sizep);
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of_node_put(np);
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return 0;
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cleanup_eio:
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of_node_put(np);
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return -EIO;
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}
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