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/*
* Copyright 2012 IBM Corporation
*
* Author: Ashley Lai <ashleydlai@gmail.com>
*
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
*
* 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 u64 *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, "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("%s: ERROR - SML not found\n", __func__);
goto cleanup_eio;
}
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__);
of_node_put(np);
return -ENOMEM;
}
log->bios_event_log_end = log->bios_event_log + *sizep;
memcpy(log->bios_event_log, __va(*basep), *sizep);
of_node_put(np);
return 0;
cleanup_eio:
of_node_put(np);
return -EIO;
}
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