src/vboot/vbnv_layout.h

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2015 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 __VBOOT_VBNV_LAYOUT_H__
#define __VBOOT_VBNV_LAYOUT_H__

#define VBOOT_VBNV_BLOCK_SIZE 16	/* Size of NV storage block in bytes */

/* Constants for NV storage.  We use this rather than structs and
 * bitfields so the data format is consistent across platforms and
 * compilers.
 */
#define HEADER_OFFSET                0
#define HEADER_MASK                     0xC0
#define HEADER_SIGNATURE                0x40
#define HEADER_FIRMWARE_SETTINGS_RESET  0x20
#define HEADER_KERNEL_SETTINGS_RESET    0x10

#define BOOT_OFFSET                  1
#define BOOT_DEBUG_RESET_MODE           0x80
#define BOOT_DISABLE_DEV_REQUEST        0x40
#define BOOT_OPROM_NEEDED               0x20
#define BOOT_TRY_B_COUNT_MASK           0x0F

#define RECOVERY_OFFSET              2
#define LOCALIZATION_OFFSET          3

#define DEV_FLAGS_OFFSET             4
#define DEV_BOOT_USB_MASK               0x01
#define DEV_BOOT_SIGNED_ONLY_MASK       0x02

#define MISC_FLAGS_OFFSET            8
#define MISC_FLAGS_BATTERY_CUTOFF_MASK  0x08

#define KERNEL_FIELD_OFFSET         11
#define CRC_OFFSET                  15

#endif /* __VBOOT_VBNV_LAYOUT_H__ */