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4aaaeca130
This just adds the kernel_max_rollforward field to the nvstorage
libraries and crossystem. The firmware does not use it yet; that's
coming in a subsequent CL.
16 of the fields's 32 bits are taken from unused bytes of the kernel
field. This has no effect on existing usage.
BUG=chromium:783997
BRANCH=none
TEST=make runtests
Also manual testing. In a root shell:
crossystem kernel_max_rollforward --> Should default to 0
crossystem kernel_max_rollforward=0xfffffffe
crossystem kernel_max_rollforward --> Should be 0xfffffffe
(Note that setting it to 0xffffffff is indistinguishable from the
-1 value that the crossystem library uses to indicate error, so
0xffffffff isn't actually usable as a max rollforward limit. But
0xfffffffe is, and if we ever get so close to the limit that we
need to use 0xffffffff, something has already gone horribly wrong
with our versioning strategy...)
Change-Id: I008f412e6ed3c0b59beb9881268585af69d1ff2e
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/765572
Reviewed-by: Julius Werner <jwerner@chromium.org>
84 lines
3.2 KiB
C
84 lines
3.2 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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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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/* 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 = 0xc0) */
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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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/* 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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