/* Copyright 2015 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Non-volatile storage bitfields
 */

#ifndef VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_
#define VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_

/*
 * Constants for NV storage.  We use this rather than structs and bitfields so
 * the data format is consistent across platforms and compilers.  Total NV
 * storage size is VB2_NVDATA_SIZE = 16 bytes.
 *
 * These constants must match the equivalent constants in
 * lib/vboot_nvstorage.c.  (We currently don't share a common header file
 * because we're tring to keep the two libs independent, and we hope to
 * deprecate that one.)
 */

enum vb2_nv_offset {
	VB2_NV_OFFS_HEADER = 0,
	VB2_NV_OFFS_BOOT = 1,
	VB2_NV_OFFS_RECOVERY = 2,
	VB2_NV_OFFS_LOCALIZATION = 3,
	VB2_NV_OFFS_DEV = 4,
	VB2_NV_OFFS_TPM = 5,
	VB2_NV_OFFS_RECOVERY_SUBCODE = 6,
	VB2_NV_OFFS_BOOT2 = 7,
	/* Offsets 8-10 are currently unused */
	VB2_NV_OFFS_KERNEL = 11, /* 11-14; field is 32 bits */
	/* CRC must be last field */
	VB2_NV_OFFS_CRC = 15
};

/* Fields in VB2_NV_OFFS_HEADER (unused = 0x0f) */
#define VB2_NV_HEADER_KERNEL_SETTINGS_RESET    0x10
#define VB2_NV_HEADER_FW_SETTINGS_RESET        0x20
#define VB2_NV_HEADER_SIGNATURE                0x40
#define VB2_NV_HEADER_MASK                     0xc0

/* Fields in VB2_NV_OFFS_BOOT */
#define VB2_NV_BOOT_TRY_COUNT_MASK             0x0f
#define VB2_NV_BOOT_BACKUP_NVRAM               0x10
#define VB2_NV_BOOT_OPROM_NEEDED               0x20
#define VB2_NV_BOOT_DISABLE_DEV                0x40
#define VB2_NV_BOOT_DEBUG_RESET                0x80

/* Fields in VB2_NV_OFFS_BOOT2 (unused = 0x80) */
#define VB2_NV_BOOT2_RESULT_MASK               0x03
#define VB2_NV_BOOT2_TRIED                     0x04
#define VB2_NV_BOOT2_TRY_NEXT                  0x08
#define VB2_NV_BOOT2_PREV_RESULT_MASK          0x30
#define VB2_NV_BOOT2_PREV_RESULT_SHIFT 4  /* Number of bits to shift result */
#define VB2_NV_BOOT2_PREV_TRIED                0x40

/* Fields in VB2_NV_OFFS_DEV (unused = 0xf8) */
#define VB2_NV_DEV_FLAG_USB                    0x01
#define VB2_NV_DEV_FLAG_SIGNED_ONLY            0x02
#define VB2_NV_DEV_FLAG_LEGACY                 0x04

/* Fields in VB2_NV_OFFS_TPM (unused = 0xfc) */
#define VB2_NV_TPM_CLEAR_OWNER_REQUEST         0x01
#define VB2_NV_TPM_CLEAR_OWNER_DONE            0x02

#endif  /* VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_ */