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/* 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:
*
* Version 1: VB2_NVDATA_SIZE = 16 bytes
* Version 2: VB2_NVDATA_SIZE_V2 = 64 bytes
*
* Unused bits/bytes must be set to 0.
*/
enum vb2_nv_offset {
/*** The following fields are present in all versions ***/
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,
VB2_NV_OFFS_MISC = 8,
VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD1 = 9, /* bits 0-7 of 32 */
VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD2 = 10, /* bits 8-15 of 32 */
VB2_NV_OFFS_KERNEL1 = 11, /* bits 0-7 of 16 */
VB2_NV_OFFS_KERNEL2 = 12, /* bits 8-15 of 16 */
VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD3 = 13, /* bits 16-23 of 32 */
VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD4 = 14, /* bits 24-31 of 32 */
/*
* CRC_V1 must be last field in V1. This byte can be reused in later
* versions.
*/
VB2_NV_OFFS_CRC_V1 = 15,
/* The following fields are only present in V2+ */
VB2_NV_OFFS_RESERVED_V2 = 15, /* Was CRC in V1 (unused = 0xff) */
VB2_NV_OFFS_FW_MAX_ROLLFORWARD1 = 16, /* bits 0-7 of 32 */
VB2_NV_OFFS_FW_MAX_ROLLFORWARD2 = 17, /* bits 8-15 of 32 */
VB2_NV_OFFS_FW_MAX_ROLLFORWARD3 = 18, /* bits 16-23 of 32 */
VB2_NV_OFFS_FW_MAX_ROLLFORWARD4 = 19, /* bits 24-31 of 32 */
/* CRC must be last field */
VB2_NV_OFFS_CRC_V2 = 63,
};
/* Fields in VB2_NV_OFFS_HEADER (unused = 0x04) */
#define VB2_NV_HEADER_WIPEOUT 0x08
#define VB2_NV_HEADER_KERNEL_SETTINGS_RESET 0x10
#define VB2_NV_HEADER_FW_SETTINGS_RESET 0x20
#define VB2_NV_HEADER_SIGNATURE_MASK 0xc3
/*
* Valid signature values. Note that V1 readers only looked at mask 0xc0, and
* expect it to have value 0x40. Versions != V1 must have the top two bits !=
* 0x40 so old readers will reject the data. Using all 1-bits or all 0-bits is
* also discouraged, because that is indistinguishable from all-erased data on
* some platforms.
*/
/* Version 1 = 16-byte record */
#define VB2_NV_HEADER_SIGNATURE_V1 0x40
/* Version 2 = 64-byte record */
#define VB2_NV_HEADER_SIGNATURE_V2 0x03
/* 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_DISPLAY_REQUEST 0x20
#define VB2_NV_BOOT_DISABLE_DEV 0x40
#define VB2_NV_BOOT_DEBUG_RESET 0x80
/* Fields in VB2_NV_OFFS_BOOT2 (unused = 0x00) */
#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
#define VB2_NV_BOOT2_REQ_DIAG 0x80
/* Fields in VB2_NV_OFFS_DEV (unused = 0x80) */
#define VB2_NV_DEV_FLAG_USB 0x01
#define VB2_NV_DEV_FLAG_SIGNED_ONLY 0x02
#define VB2_NV_DEV_FLAG_LEGACY 0x04
#define VB2_NV_DEV_FLAG_FASTBOOT_FULL_CAP 0x08
#define VB2_NV_DEV_FLAG_DEFAULT_BOOT 0x30
#define VB2_NV_DEV_DEFAULT_BOOT_SHIFT 4 /* Number of bits to shift */
#define VB2_NV_DEV_FLAG_UDC 0x40
/* Fields in VB2_NV_OFFS_TPM (unused = 0xf8) */
#define VB2_NV_TPM_CLEAR_OWNER_REQUEST 0x01
#define VB2_NV_TPM_CLEAR_OWNER_DONE 0x02
#define VB2_NV_TPM_REBOOTED 0x04
/* Fields in VB2_NV_OFFS_MISC (unused = 0x80) */
#define VB2_NV_MISC_UNLOCK_FASTBOOT 0x01
#define VB2_NV_MISC_BOOT_ON_AC_DETECT 0x02
#define VB2_NV_MISC_TRY_RO_SYNC 0x04
#define VB2_NV_MISC_BATTERY_CUTOFF 0x08
#define VB2_NV_MISC_DEPRECATED_ENABLE_ALT_OS 0x10
#define VB2_NV_MISC_DEPRECATED_DISABLE_ALT_OS 0x20
#define VB2_NV_MISC_POST_EC_SYNC_DELAY 0x40
#endif /* VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_ */
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