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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
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