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https://github.com/Telecominfraproject/OpenCellular.git
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534194ead7
This change adds a new NV and GBB flag for controlling USB device mode behavior, adding an additional step to enable UDC on systems that support it. Users of this feature will need to first enable developer mode and then enable UDC separately by running "crossystem dev_enable_udc=1". Alternatively those without write protect enabled can set a GBB flag to have UDC enabled by default while in developer mode. This is based on the security reviewed proposal at https://docs.google.com/document/d/1b6avd9xvhvljN_NKtctWrClj4mSYZ_uPmp7MmAnPwqs BUG=b:74339386 BRANCH=poppy TEST=manual testing on Eve device Change-Id: I6f440320f28b033639b53246d3034bc8acc37a33 Signed-off-by: Duncan Laurie <dlaurie@google.com> Reviewed-on: https://chromium-review.googlesource.com/1010769 Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Furquan Shaikh <furquan@chromium.org>
111 lines
4.1 KiB
C
111 lines
4.1 KiB
C
/* Copyright 2015 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Non-volatile storage bitfields
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*/
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#ifndef VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_
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#define VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_
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/*
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* Constants for NV storage. We use this rather than structs and bitfields so
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* the data format is consistent across platforms and compilers. Total NV
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* storage size is:
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*
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* Version 1: VB2_NVDATA_SIZE = 16 bytes
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* Version 2: VB2_NVDATA_SIZE_V2 = 64 bytes
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*
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* Unused bits/bytes must be set to 0.
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*/
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enum vb2_nv_offset {
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/*** The following fields are present in all versions ***/
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VB2_NV_OFFS_HEADER = 0,
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VB2_NV_OFFS_BOOT = 1,
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VB2_NV_OFFS_RECOVERY = 2,
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VB2_NV_OFFS_LOCALIZATION = 3,
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VB2_NV_OFFS_DEV = 4,
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VB2_NV_OFFS_TPM = 5,
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VB2_NV_OFFS_RECOVERY_SUBCODE = 6,
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VB2_NV_OFFS_BOOT2 = 7,
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VB2_NV_OFFS_MISC = 8,
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VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD1 = 9, /* bits 0-7 of 32 */
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VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD2 = 10, /* bits 8-15 of 32 */
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VB2_NV_OFFS_KERNEL1 = 11, /* bits 0-7 of 16 */
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VB2_NV_OFFS_KERNEL2 = 12, /* bits 8-15 of 16 */
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VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD3 = 13, /* bits 16-23 of 32 */
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VB2_NV_OFFS_KERNEL_MAX_ROLLFORWARD4 = 14, /* bits 24-31 of 32 */
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/*
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* CRC_V1 must be last field in V1. This byte can be reused in later
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* versions.
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*/
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VB2_NV_OFFS_CRC_V1 = 15,
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/* The following fields are only present in V2+ */
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VB2_NV_OFFS_RESERVED_V2 = 15, /* Was CRC in V1 (unused = 0xff) */
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VB2_NV_OFFS_FW_MAX_ROLLFORWARD1 = 16, /* bits 0-7 of 32 */
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VB2_NV_OFFS_FW_MAX_ROLLFORWARD2 = 17, /* bits 8-15 of 32 */
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VB2_NV_OFFS_FW_MAX_ROLLFORWARD3 = 18, /* bits 16-23 of 32 */
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VB2_NV_OFFS_FW_MAX_ROLLFORWARD4 = 19, /* bits 24-31 of 32 */
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/* CRC must be last field */
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VB2_NV_OFFS_CRC_V2 = 63,
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};
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/* Fields in VB2_NV_OFFS_HEADER (unused = 0x04) */
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#define VB2_NV_HEADER_WIPEOUT 0x08
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#define VB2_NV_HEADER_KERNEL_SETTINGS_RESET 0x10
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#define VB2_NV_HEADER_FW_SETTINGS_RESET 0x20
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#define VB2_NV_HEADER_SIGNATURE_MASK 0xc3
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/*
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* Valid signature values. Note that V1 readers only looked at mask 0xc0, and
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* expect it to have value 0x40. Versions != V1 must have the top two bits !=
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* 0x40 so old readers will reject the data. Using all 1-bits or all 0-bits is
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* also discouraged, because that is indistinguishable from all-erased data on
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* some platforms.
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*/
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/* Version 1 = 16-byte record */
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#define VB2_NV_HEADER_SIGNATURE_V1 0x40
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/* Version 2 = 64-byte record */
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#define VB2_NV_HEADER_SIGNATURE_V2 0x03
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/* Fields in VB2_NV_OFFS_BOOT */
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#define VB2_NV_BOOT_TRY_COUNT_MASK 0x0f
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#define VB2_NV_BOOT_BACKUP_NVRAM 0x10
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#define VB2_NV_BOOT_OPROM_NEEDED 0x20
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#define VB2_NV_BOOT_DISABLE_DEV 0x40
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#define VB2_NV_BOOT_DEBUG_RESET 0x80
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/* Fields in VB2_NV_OFFS_BOOT2 (unused = 0x80) */
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#define VB2_NV_BOOT2_RESULT_MASK 0x03
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#define VB2_NV_BOOT2_TRIED 0x04
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#define VB2_NV_BOOT2_TRY_NEXT 0x08
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#define VB2_NV_BOOT2_PREV_RESULT_MASK 0x30
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#define VB2_NV_BOOT2_PREV_RESULT_SHIFT 4 /* Number of bits to shift result */
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#define VB2_NV_BOOT2_PREV_TRIED 0x40
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/* Fields in VB2_NV_OFFS_DEV (unused = 0x80) */
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#define VB2_NV_DEV_FLAG_USB 0x01
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#define VB2_NV_DEV_FLAG_SIGNED_ONLY 0x02
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#define VB2_NV_DEV_FLAG_LEGACY 0x04
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#define VB2_NV_DEV_FLAG_FASTBOOT_FULL_CAP 0x08
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#define VB2_NV_DEV_FLAG_DEFAULT_BOOT 0x30
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#define VB2_NV_DEV_DEFAULT_BOOT_SHIFT 4 /* Number of bits to shift */
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#define VB2_NV_DEV_FLAG_UDC 0x40
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/* Fields in VB2_NV_OFFS_TPM (unused = 0xf8) */
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#define VB2_NV_TPM_CLEAR_OWNER_REQUEST 0x01
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#define VB2_NV_TPM_CLEAR_OWNER_DONE 0x02
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#define VB2_NV_TPM_REBOOTED 0x04
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/* Fields in VB2_NV_OFFS_MISC (unused = 0xf0) */
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#define VB2_NV_MISC_UNLOCK_FASTBOOT 0x01
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#define VB2_NV_MISC_BOOT_ON_AC_DETECT 0x02
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#define VB2_NV_MISC_TRY_RO_SYNC 0x04
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#define VB2_NV_MISC_BATTERY_CUTOFF 0x08
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#endif /* VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_ */
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