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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The ChromiumOS Authors. All rights reserved.
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <elog.h>
#define GSMI_RET_SUCCESS 0x00
#define GSMI_RET_INVALID_PARAMETER 0x82
#define GSMI_RET_UNSUPPORTED 0x83
#define GSMI_CMD_SET_EVENT_LOG 0x08
#define GSMI_CMD_CLEAR_EVENT_LOG 0x09
#define GSMI_CMD_HANDSHAKE_TYPE 0xc1
#define GSMI_HANDSHAKE_NONE 0x7f
#define GSMI_LOG_ENTRY_TYPE_KERNEL 0xDEAD
struct gsmi_set_eventlog_param {
u32 data_ptr;
u32 data_len;
u32 type;
} __attribute__ ((packed));
struct gsmi_set_eventlog_type1 {
u16 type;
u32 instance;
} __attribute__ ((packed));
struct gsmi_clear_eventlog_param {
u32 percentage;
u32 data_type;
} __attribute__ ((packed));
/* Param is usually EBX, ret in EAX */
u32 gsmi_exec(u8 command, u32 *param)
{
struct gsmi_set_eventlog_param *sel;
struct gsmi_set_eventlog_type1 *type1;
struct gsmi_clear_eventlog_param *cel;
u32 ret = GSMI_RET_UNSUPPORTED;
switch (command) {
case GSMI_CMD_HANDSHAKE_TYPE:
/* Used by kernel to verify basic SMI functionality */
printk(BIOS_DEBUG, "GSMI Handshake\n");
ret = GSMI_HANDSHAKE_NONE;
break;
case GSMI_CMD_SET_EVENT_LOG:
/* Look for a type1 event */
sel = (struct gsmi_set_eventlog_param *)(*param);
if (!sel)
break;
/* Make sure the input is usable */
if (sel->type != 1 && sel->data_ptr != 0 &&
sel->data_len != sizeof(struct gsmi_set_eventlog_type1))
break;
/* Event structure within the data buffer */
type1 = (struct gsmi_set_eventlog_type1 *)(sel->data_ptr);
if (!type1)
break;
printk(BIOS_DEBUG, "GSMI Set Event Log "
"(type=0x%x instance=0x%x)\n",
type1->type, type1->instance);
if (type1->type == GSMI_LOG_ENTRY_TYPE_KERNEL) {
/* Special case for linux kernel shutdown reason */
elog_add_event_dword(ELOG_TYPE_OS_EVENT,
type1->instance);
} else {
/* Add other events that may be used for testing */
elog_add_event_dword(type1->type, type1->instance);
}
ret = GSMI_RET_SUCCESS;
break;
case GSMI_CMD_CLEAR_EVENT_LOG:
/* Get parameter buffer even though we don't use it */
cel = (struct gsmi_clear_eventlog_param *)(*param);
if (!cel)
break;
printk(BIOS_DEBUG, "GSMI Clear Event Log (%u%% type=%u)\n",
cel->percentage, cel->data_type);
if (elog_clear() == 0)
ret = GSMI_RET_SUCCESS;
break;
default:
printk(BIOS_DEBUG, "GSMI Unknown: 0x%02x\n", command);
break;
}
return ret;
}
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