/* 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