android_image.h
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* This is from the Android Project,
* Repository: https://android.googlesource.com/platform/system/tools/mkbootimg
* File: include/bootimg/bootimg.h
* Commit: e55998a0f2b61b685d5eb4a486ca3a0c680b1a2f
*
* Copyright (C) 2007 The Android Open Source Project
*/
#ifndef _ANDROID_IMAGE_H_
#define _ANDROID_IMAGE_H_
#include <linux/compiler.h>
#include <linux/types.h>
#define ANDR_BOOT_MAGIC "ANDROID!"
#define ANDR_BOOT_MAGIC_SIZE 8
#define ANDR_BOOT_NAME_SIZE 16
#define ANDR_BOOT_ARGS_SIZE 512
#define ANDR_BOOT_EXTRA_ARGS_SIZE 1024
/* The bootloader expects the structure of andr_img_hdr with header
* version 0 to be as follows: */
struct andr_img_hdr {
/* Must be ANDR_BOOT_MAGIC. */
char magic[ANDR_BOOT_MAGIC_SIZE];
u32 kernel_size; /* size in bytes */
u32 kernel_addr; /* physical load addr */
u32 ramdisk_size; /* size in bytes */
u32 ramdisk_addr; /* physical load addr */
u32 second_size; /* size in bytes */
u32 second_addr; /* physical load addr */
u32 tags_addr; /* physical addr for kernel tags */
u32 page_size; /* flash page size we assume */
/* Version of the boot image header. */
u32 header_version;
/* Operating system version and security patch level.
* For version "A.B.C" and patch level "Y-M-D":
* (7 bits for each of A, B, C; 7 bits for (Y-2000), 4 bits for M)
* os_version = A[31:25] B[24:18] C[17:11] (Y-2000)[10:4] M[3:0] */
u32 os_version;
char name[ANDR_BOOT_NAME_SIZE]; /* asciiz product name */
char cmdline[ANDR_BOOT_ARGS_SIZE];
u32 id[8]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg. */
char extra_cmdline[ANDR_BOOT_EXTRA_ARGS_SIZE];
/* Fields in boot_img_hdr_v1 and newer. */
u32 recovery_dtbo_size; /* size in bytes for recovery DTBO/ACPIO image */
u64 recovery_dtbo_offset; /* offset to recovery dtbo/acpio in boot image */
u32 header_size;
/* Fields in boot_img_hdr_v2 and newer. */
u32 dtb_size; /* size in bytes for DTB image */
u64 dtb_addr; /* physical load address for DTB image */
} __attribute__((packed));
/* When a boot header is of version 0, the structure of boot image is as
* follows:
*
* +-----------------+
* | boot header | 1 page
* +-----------------+
* | kernel | n pages
* +-----------------+
* | ramdisk | m pages
* +-----------------+
* | second stage | o pages
* +-----------------+
*
* n = (kernel_size + page_size - 1) / page_size
* m = (ramdisk_size + page_size - 1) / page_size
* o = (second_size + page_size - 1) / page_size
*
* 0. all entities are page_size aligned in flash
* 1. kernel and ramdisk are required (size != 0)
* 2. second is optional (second_size == 0 -> no second)
* 3. load each element (kernel, ramdisk, second) at
* the specified physical address (kernel_addr, etc)
* 4. prepare tags at tag_addr. kernel_args[] is
* appended to the kernel commandline in the tags.
* 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
* 6. if second_size != 0: jump to second_addr
* else: jump to kernel_addr
*/
/* When the boot image header has a version of 2, the structure of the boot
* image is as follows:
*
* +---------------------+
* | boot header | 1 page
* +---------------------+
* | kernel | n pages
* +---------------------+
* | ramdisk | m pages
* +---------------------+
* | second stage | o pages
* +---------------------+
* | recovery dtbo/acpio | p pages
* +---------------------+
* | dtb | q pages
* +---------------------+
*
* n = (kernel_size + page_size - 1) / page_size
* m = (ramdisk_size + page_size - 1) / page_size
* o = (second_size + page_size - 1) / page_size
* p = (recovery_dtbo_size + page_size - 1) / page_size
* q = (dtb_size + page_size - 1) / page_size
*
* 0. all entities are page_size aligned in flash
* 1. kernel, ramdisk and DTB are required (size != 0)
* 2. recovery_dtbo/recovery_acpio is required for recovery.img in non-A/B
* devices(recovery_dtbo_size != 0)
* 3. second is optional (second_size == 0 -> no second)
* 4. load each element (kernel, ramdisk, second, dtb) at
* the specified physical address (kernel_addr, etc)
* 5. If booting to recovery mode in a non-A/B device, extract recovery
* dtbo/acpio and apply the correct set of overlays on the base device tree
* depending on the hardware/product revision.
* 6. prepare tags at tag_addr. kernel_args[] is
* appended to the kernel commandline in the tags.
* 7. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
* 8. if second_size != 0: jump to second_addr
* else: jump to kernel_addr
*/
#endif