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c8e48545d5
When a TPM goes from the disabled state to the enabled state, it must reboot after being enabled, before it can be initialized. In vboot1, TLCL was part of vboot and this was handled internally. In vboot2, the caller must set a context flag, so that vboot can decide whether to allow the reboot, or whether to go directly to recovery mode. This check is necessary to handle the following cases: 1) The device is booting normally, but the TPM needs a reboot. This should simply reboot, without going to recovery mode. 2) The device is booting in recovery mode, but the TPM needs a reboot. If this is the first time it asked us, allow the reboot. 3) The TPM asked for a reboot last time, so we did. And it's still asking. Don't reboot, because that runs the risk that whatever is wrong won't be fixed next boot either, and we'll get stuck in a reboot loop that will prevent recovery. Boot into recovery mode. Add a new NvStorage bit to track whether the TPM requested a reboot on the previous boot. That's better than what we did in vboot1, where we used a special recovery request. Vboot1 couldn't track getting stuck in a reboot loop in normal mode, only in recovery mode. The new code can catch both. BUG=chrome-os-partner:45462 BRANCH=ryu TEST=make runtests Change-Id: I2ee54af107275ccf64a6cb41132b7a0fc02bb983 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/300572 Tested-by: Furquan Shaikh <furquan@chromium.org> Reviewed-by: Furquan Shaikh <furquan@chromium.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
76 lines
2.8 KiB
C
76 lines
2.8 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 VB2_NVDATA_SIZE = 16 bytes.
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*
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* These constants must match the equivalent constants in
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* lib/vboot_nvstorage.c. (We currently don't share a common header file
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* because we're tring to keep the two libs independent, and we hope to
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* deprecate that one.)
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*/
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enum vb2_nv_offset {
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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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/* Offsets 9-10 are currently unused */
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VB2_NV_OFFS_KERNEL = 11, /* 11-14; field is 32 bits */
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/* CRC must be last field */
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VB2_NV_OFFS_CRC = 15
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};
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/* Fields in VB2_NV_OFFS_HEADER (unused = 0x07) */
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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 0x40
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#define VB2_NV_HEADER_MASK 0xc0
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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 = 0xf0) */
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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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/* 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 = 0xfc) */
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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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#endif /* VBOOT_REFERENCE_VBOOT_2NVSTORAGE_FIELDS_H_ */
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