| Ruslan Trofymenko | d65e8da | 2019-07-05 15:37:32 +0300 | [diff] [blame] | 1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
| 2 | /* |
| 3 | * Copyright (C) 2017 The Android Open Source Project |
| 4 | */ |
| 5 | |
| 6 | #ifndef __ANDROID_AB_H |
| 7 | #define __ANDROID_AB_H |
| 8 | |
| 9 | #include <common.h> |
| 10 | |
| 11 | /* Android standard boot slot names are 'a', 'b', 'c', ... */ |
| 12 | #define BOOT_SLOT_NAME(slot_num) ('a' + (slot_num)) |
| 13 | |
| 14 | /* Number of slots */ |
| 15 | #define NUM_SLOTS 2 |
| 16 | |
| 17 | /** |
| 18 | * Select the slot where to boot from. |
| 19 | * |
| 20 | * On Android devices with more than one boot slot (multiple copies of the |
| 21 | * kernel and system images) selects which slot should be used to boot from and |
| 22 | * registers the boot attempt. This is used in by the new A/B update model where |
| 23 | * one slot is updated in the background while running from the other slot. If |
| 24 | * the selected slot did not successfully boot in the past, a boot attempt is |
| 25 | * registered before returning from this function so it isn't selected |
| 26 | * indefinitely. |
| 27 | * |
| 28 | * @param[in] dev_desc Place to store the device description pointer |
| 29 | * @param[in] part_info Place to store the partition information |
| 30 | * @return The slot number (>= 0) on success, or a negative on error |
| 31 | */ |
| 32 | int ab_select_slot(struct blk_desc *dev_desc, disk_partition_t *part_info); |
| 33 | |
| 34 | #endif /* __ANDROID_AB_H */ |