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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2017 The Android Open Source Project
*/
#ifndef __ANDROID_AB_H
#define __ANDROID_AB_H
struct blk_desc;
struct disk_partition;
/* Android standard boot slot names are 'a', 'b', 'c', ... */
#define BOOT_SLOT_NAME(slot_num) ('a' + (slot_num))
/* Number of slots */
#define NUM_SLOTS 2
/**
* Select the slot where to boot from.
*
* On Android devices with more than one boot slot (multiple copies of the
* kernel and system images) selects which slot should be used to boot from and
* registers the boot attempt. This is used in by the new A/B update model where
* one slot is updated in the background while running from the other slot. If
* the selected slot did not successfully boot in the past, a boot attempt is
* registered before returning from this function so it isn't selected
* indefinitely.
*
* @param[in] dev_desc Place to store the device description pointer
* @param[in] part_info Place to store the partition information
* @return The slot number (>= 0) on success, or a negative on error
*/
int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info);
#endif /* __ANDROID_AB_H */
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