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