android_image.h
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/*
* This is from the Android Project,
* Repository: https://android.googlesource.com/platform/system/core/
* File: mkbootimg/bootimg.h
* Commit: d162828814b08ada310846a33205befb69ef5799
*
* Copyright (C) 2008 The Android Open Source Project
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#ifndef _ANDROID_IMAGE_H_
#define _ANDROID_IMAGE_H_
typedef struct andr_img_hdr andr_img_hdr;
#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
/* Boot metric variables (in millisecond) */
struct boot_metric
{
u32 bll_1; /* 1th bootloader load duration */
u32 ble_1; /* 1th bootloader exec duration */
u32 kl; /* kernel image load duration */
u32 kd; /* kernel image decompress duration */
u32 avb; /* avb verify boot.img duration */
u32 odt; /* overlay device tree duration */
u32 sw; /* system wait for UI interaction duration*/
};
typedef struct boot_metric boot_metric;
struct andr_img_hdr {
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 */
u32 header_version;
/* operating system version and security patch level; for
* version "A.B.C" and patch level "Y-M-D":
* ver = A << 14 | B << 7 | C (7 bits for each of A, B, C)
* lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M)
* os_version = ver << 11 | lvl */
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];
uint32_t recovery_dtbo_size; /* size of recovery dtbo image */
uint64_t recovery_dtbo_offset; /* offset in boot image */
uint32_t header_size; /* size of boot image header in bytes */
} __attribute__((packed));
/*
* +-----------------+
* | boot header | 1 page
* +-----------------+
* | kernel | i pages
* +-----------------+
* | ramdisk | m pages
* +-----------------+
* | second stage | n pages
* +-----------------+
* | recovery dtbo | o pages
* +-----------------+
*
* i = (kernel_size + page_size - 1) / page_size
* m = (ramdisk_size + page_size - 1) / page_size
* n = (second_size + page_size - 1) / page_size
* o = (recovery_dtbo_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
*/
struct header_image {
uint32_t code0; /* Executable code */
uint32_t code1; /* Executable code */
uint64_t text_offset; /* Image load offset, LE */
uint64_t image_size; /* Effective Image size, LE */
uint64_t res1; /* reserved */
uint64_t res2; /* reserved */
uint64_t res3; /* reserved */
uint64_t res4; /* reserved */
uint32_t magic; /* Magic number */
uint32_t res5;
};
#endif