140 lines
4.4 KiB
C
Raw Normal View History

2025-05-10 21:49:39 +08:00
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _RECOVERY_BOOTLOADER_H
#define _RECOVERY_BOOTLOADER_H
#include "common.h"
static const int BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 16 * 1024;
#define MISC_OFFSET 2048 //A,B 结构体在偏移2K 的位置
#define MISC_OFFSET_CMDLINE 6144 //擦除命令在偏移4K 的位置,配合挂载脚本使用
#define MISC_OFFSET_CUSTOM (10 * 1024) //CUSTOM, 8K (10K), length 1K
#define MISC_PAGES_AB 2 // A,B 结构体存在 2 PAGE内
#define MISC_COMMAND_PAGE_AB 1 // A,B 结构体存在 1 PAGE处即2k
#define AB_SLOT_NUM 2
/* Magic for the A/B struct when serialized. */
#define AVB_AB_MAGIC "\0AB0"
#define AVB_AB_MAGIC_LEN 4
/* Versioning for the on-disk A/B metadata - keep in sync with avbtool. */
#define AVB_AB_MAJOR_VERSION 1
#define AVB_AB_MINOR_VERSION 0
/* Size of AvbABData struct. */
#define AVB_AB_DATA_SIZE 32
/* Maximum values for slot data */
#define AVB_AB_MAX_PRIORITY 15
#define AVB_AB_MAX_TRIES_REMAINING 7
#define CMD_WIPE_USERDATA "cmd_wipe_userdata"
/* Bootloader Message
*
* This structure describes the content of a block in flash
* that is used for recovery and the bootloader to talk to
* each other.
*
* The command field is updated by linux when it wants to
* reboot into recovery or to update radio or bootloader firmware.
* It is also updated by the bootloader when firmware update
* is complete (to boot into recovery for any final cleanup)
*
* The status field is written by the bootloader after the
* completion of an "update-radio" or "update-hboot" command.
*
* The recovery field is only written by linux and used
* for the system to send a message to recovery or the
* other way around.
*
* The systemFlag field is used for the system to send a message to recovery.
*/
struct bootloader_message {
char command[32];
char status[32];
char recovery[768];
char needupdate[4];
char systemFlag[252];
};
/* Read and write the bootloader command from the "misc" partition.
* These return zero on success.
*/
int get_bootloader_message(struct bootloader_message *out);
int set_bootloader_message(const struct bootloader_message *in);
typedef struct AvbABSlotData {
/* Slot priority. Valid values range from 0 to AVB_AB_MAX_PRIORITY,
* both inclusive with 1 being the lowest and AVB_AB_MAX_PRIORITY
* being the highest. The special value 0 is used to indicate the
* slot is unbootable.
*/
unsigned char priority;//0,14,15
/* Number of times left attempting to boot this slot ranging from 0
* to AVB_AB_MAX_TRIES_REMAINING.
*/
unsigned char tries_remaining;//7--,成功启动设为0
/* Non-zero if this slot has booted successfully, 0 otherwise. */
unsigned char successful_boot;//0,1
/* Reserved for future use. */
unsigned char reserved[1];
} AvbABSlotData;
/* Struct used for recording A/B metadata.
*
* When serialized, data is stored in network byte-order.
*/
typedef struct AvbABData {
/* Magic number used for identification - see AVB_AB_MAGIC. */
unsigned char magic[AVB_AB_MAGIC_LEN];
/* Version of on-disk struct - see AVB_AB_{MAJOR,MINOR}_VERSION. */
unsigned char version_major; //AVB_AB_MAJOR_VERSION
unsigned char version_minor; //AVB_AB_MINOR_VERSION
/* Padding to ensure |slots| field start eight bytes in. */
unsigned char reserved1[2];
/* Per-slot metadata. */
AvbABSlotData slots[2];
/* Reserved for future use. */
unsigned char last_boot;//默认a上一次成功启动slot的标志位0-->a1-->b
unsigned char reserved2[11];
/* CRC32 of all 28 bytes preceding this field. */
unsigned int crc32;
} AvbABData;
int setSlotActivity();
int setSlotSucceed();
void miscDisplay() ;
int wipe_userdata(int auto_reboot);
int writeCustomMiscCmdline(void);
int readCustomMiscCmdline(void);
int cleanCustomMiscCmdline(void);
//bool wipe_userdata(bool auto_reboot);
#endif