/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#ifndef __ANDROID_AB_H
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#define __ANDROID_AB_H
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#include <common.h>
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/* Android standard boot slot names are 'a', 'b', 'c', ... */
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#define ANDROID_BOOT_SLOT_NAME(slot_num) ('a' + (slot_num))
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#define ENUM_MERGE_STATUS_NONE (0)
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#define ENUM_MERGE_STATUS_UNKNOWN (1)
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#define ENUM_MERGE_STATUS_SNAPSHOTTED (2)
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#define ENUM_MERGE_STATUS_MERGING (3)
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#define ENUM_MERGE_STATUS_CANCELLED (4)
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#define MISC_VIRTUAL_AB_MAGIC_HEADER (0x56740AB0)
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struct misc_virtual_ab_message {
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u8 version;
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u32 magic;
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u8 merge_status;
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u8 source_slot;
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u8 reserved[57];
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u8 reserved2[448];
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} __packed;
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/** android_ab_select - Select the slot where to boot from.
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* On Android devices with more than one boot slot (multiple copies of the
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* kernel and system images) selects which slot should be used to boot from and
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* registers the boot attempt. This is used in by the new A/B update model where
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* one slot is updated in the background while running from the other slot. If
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* the selected slot did not successfully boot in the past, a boot attempt is
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* registered before returning from this function so it isn't selected
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* indefinitely.
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*
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* @dev_desc: Place to store the device description pointer.
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* @part_info: Place to store the partition information.
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* @return the slot number (0-based) on success, or -1 on error.
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*/
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int android_ab_select(struct blk_desc *dev_desc, disk_partition_t *part_info);
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/* Read or write the Virtual A/B message from 32KB offset in /misc.*/
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int read_misc_virtual_ab_message(struct misc_virtual_ab_message *message);
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int write_misc_virtual_ab_message(struct misc_virtual_ab_message *message);
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void ab_update_root_partition(void);
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int ab_get_slot_suffix(char *slot_suffix);
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int ab_is_support_dynamic_partition(struct blk_desc *dev_desc);
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int ab_decrease_tries(void);
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bool ab_can_find_recovery_part(void);
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#endif
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