/*
 * 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.
 */

#ifndef ELOG_INTERNAL_H_
#define ELOG_INTERNAL_H_

/* ELOG header */
struct elog_header {
	u32 magic;
	u8 version;
	u8 header_size;
	u8 reserved[2];
} __attribute__ ((packed));

/* ELOG related constants */
#define ELOG_SIGNATURE			0x474f4c45  /* 'ELOG' */
#define ELOG_VERSION			1
#define ELOG_MIN_AVAILABLE_ENTRIES	2  /* Shrink when this many can't fit */
#define ELOG_SHRINK_PERCENTAGE		25 /* Percent of total area to remove */

/* SMBIOS event log header */
struct event_header {
	u8 type;
	u8 length;
	u8 year;
	u8 month;
	u8 day;
	u8 hour;
	u8 minute;
	u8 second;
} __attribute__ ((packed));

/* SMBIOS Type 15 related constants */
#define ELOG_HEADER_TYPE_OEM		0x88

typedef enum elog_area_state {
	ELOG_AREA_UNDEFINED,		/* Initial boot strap state */
	ELOG_AREA_EMPTY,		/* Entire area is empty */
	ELOG_AREA_HAS_CONTENT,		/* Area has some content */
} elog_area_state;

typedef enum elog_header_state {
	ELOG_HEADER_INVALID,
	ELOG_HEADER_VALID,
} elog_header_state;

typedef enum elog_event_buffer_state {
	ELOG_EVENT_BUFFER_OK,
	ELOG_EVENT_BUFFER_CORRUPTED,
} elog_event_buffer_state;

struct elog_area {
	struct elog_header header;
	u8 data[0];
} __attribute__((packed));

#endif /* ELOG_INTERNAL_H_ */