mtk-lk/platform/common/bootctrl/bootctrl.h

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein is
 * confidential and proprietary to MediaTek Inc. and/or its licensors. Without
 * the prior written permission of MediaTek inc. and/or its licensors, any
 * reproduction, modification, use or disclosure of MediaTek Software, and
 * information contained herein, in whole or in part, shall be strictly
 * prohibited.
 *
 * MediaTek Inc. (C) 2016. All rights reserved.
 *
 * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
 * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
 * RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO RECEIVER
 * ON AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL
 * WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NONINFRINGEMENT. NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH
 * RESPECT TO THE SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY,
 * INCORPORATED IN, OR SUPPLIED WITH THE MEDIATEK SOFTWARE, AND RECEIVER AGREES
 * TO LOOK ONLY TO SUCH THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO.
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 * OBTAIN FROM ANY THIRD PARTY ALL PROPER LICENSES CONTAINED IN MEDIATEK
 * SOFTWARE. MEDIATEK SHALL ALSO NOT BE RESPONSIBLE FOR ANY MEDIATEK SOFTWARE
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 * ENTIRE AND CUMULATIVE LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE
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 * MEDIATEK SOFTWARE AT ISSUE, OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE
 * CHARGE PAID BY RECEIVER TO MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.
 *
 * The following software/firmware and/or related documentation ("MediaTek
 * Software") have been modified by MediaTek Inc. All revisions are subject to
 * any receiver's applicable license agreements with MediaTek Inc.
 */


/* THE HAL BOOTCTRL HEADER MUST BE IN SYNC WITH THE UBOOT BOOTCTRL HEADER */

#ifndef _BOOTCTRL_H_
#define _BOOTCTRL_H_

#include <stdint.h>

/* struct boot_ctrl occupies the slot_suffix field of
 * struct bootloader_message */

#define OFFSETOF_SLOT_SUFFIX 2048

#define BOOTCTRL_SUFFIX_MAXLEN 2

#define BOOTCTRL_MAGIC 0x42414342
#define BOOTCTRL_VERSION 1
#define BOOTCTRL_SUFFIX_A           "_a"
#define BOOTCTRL_SUFFIX_B           "_b"

#define READ_PARTITION    0
#define WRITE_PARTITION    1
#define BOOT_CONTROL_MAX_RETRY  (7)
#define BOOT_CONTROL_MAX_PRI    (15)
#define BOOTCTRL_NUM_SLOTS (2)

struct slot_metadata {
    // Slot priority with 15 meaning highest priority, 1 lowest
    // priority and 0 the slot is unbootable.
    uint8_t priority : 4;
    // Number of times left attempting to boot this slot.
    uint8_t tries_remaining : 3;
    // 1 if this slot has booted successfully, 0 otherwise.
    uint8_t successful_boot : 1;
    // 1 if this slot is corrupted from a dm-verity corruption, 0
    // otherwise.
    uint8_t verity_corrupted : 1;
    // Reserved for further use.
    uint8_t reserved : 7;
} __attribute__((packed));

/* Bootloader Control AB
 *
 * This struct can be used to manage A/B metadata. It is designed to
 * be put in the 'slot_suffix' field of the 'bootloader_message'
 * structure described above. It is encouraged to use the
 * 'bootloader_control' structure to store the A/B metadata, but not
 * mandatory.
 */
struct bootloader_control {
    // NUL terminated active slot suffix.
    char slot_suffix[4];
    // Bootloader Control AB magic number (see BOOT_CTRL_MAGIC).
    uint32_t magic;
    // Version of struct being used (see BOOT_CTRL_VERSION).
    uint8_t version;
    // Number of slots being managed.
    uint8_t nb_slot : 3;
    // Number of times left attempting to boot recovery.
    uint8_t recovery_tries_remaining : 3;
    // Status of any pending snapshot merge of dynamic partitions.
    uint8_t merge_status : 3;
    // Ensure 4-bytes alignment for slot_info field.
    uint8_t reserved0[1];
    // Per-slot information.  Up to 4 slots.
    struct slot_metadata slot_info[4];
    // Reserved for further use.
    uint8_t reserved1[8];
    // CRC32 of all 28 bytes preceding this field (little endian
    // format).
    uint32_t crc32_le;
} __attribute__((packed));

/* bootctrl API */
const char *get_suffix(void);
int set_active_slot(const char *suffix);
uint8_t get_retry_count(const char *suffix);
int get_bootup_status(const char *suffix);
int get_bootable_status(const char *suffix);
int increase_tries_remaining(void);
int get_slot_info(int slot, uint8_t *priority, uint8_t *tries_remaining, uint8_t *successful_boot);
int bootctrl_retry_decrease(int slot);

#endif /* _BOOTCTRL_H_ */