android_image.h 2.5 KB

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  1. /* SPDX-License-Identifier: BSD-2-Clause */
  2. /*
  3. * This is from the Android Project,
  4. * Repository: https://android.googlesource.com/platform/system/core/
  5. * File: mkbootimg/bootimg.h
  6. * Commit: d162828814b08ada310846a33205befb69ef5799
  7. *
  8. * Copyright (C) 2008 The Android Open Source Project
  9. */
  10. #ifndef _ANDROID_IMAGE_H_
  11. #define _ANDROID_IMAGE_H_
  12. typedef struct andr_img_hdr andr_img_hdr;
  13. #define ANDR_BOOT_MAGIC "ANDROID!"
  14. #define ANDR_BOOT_MAGIC_SIZE 8
  15. #define ANDR_BOOT_NAME_SIZE 16
  16. #define ANDR_BOOT_ARGS_SIZE 512
  17. #define ANDR_BOOT_EXTRA_ARGS_SIZE 1024
  18. struct andr_img_hdr {
  19. char magic[ANDR_BOOT_MAGIC_SIZE];
  20. u32 kernel_size; /* size in bytes */
  21. u32 kernel_addr; /* physical load addr */
  22. u32 ramdisk_size; /* size in bytes */
  23. u32 ramdisk_addr; /* physical load addr */
  24. u32 second_size; /* size in bytes */
  25. u32 second_addr; /* physical load addr */
  26. u32 tags_addr; /* physical addr for kernel tags */
  27. u32 page_size; /* flash page size we assume */
  28. u32 unused; /* reserved for future expansion: MUST be 0 */
  29. /* operating system version and security patch level; for
  30. * version "A.B.C" and patch level "Y-M-D":
  31. * ver = A << 14 | B << 7 | C (7 bits for each of A, B, C)
  32. * lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M)
  33. * os_version = ver << 11 | lvl */
  34. u32 os_version;
  35. char name[ANDR_BOOT_NAME_SIZE]; /* asciiz product name */
  36. char cmdline[ANDR_BOOT_ARGS_SIZE];
  37. u32 id[8]; /* timestamp / checksum / sha1 / etc */
  38. /* Supplemental command line data; kept here to maintain
  39. * binary compatibility with older versions of mkbootimg */
  40. char extra_cmdline[ANDR_BOOT_EXTRA_ARGS_SIZE];
  41. } __attribute__((packed));
  42. /*
  43. * +-----------------+
  44. * | boot header | 1 page
  45. * +-----------------+
  46. * | kernel | n pages
  47. * +-----------------+
  48. * | ramdisk | m pages
  49. * +-----------------+
  50. * | second stage | o pages
  51. * +-----------------+
  52. *
  53. * n = (kernel_size + page_size - 1) / page_size
  54. * m = (ramdisk_size + page_size - 1) / page_size
  55. * o = (second_size + page_size - 1) / page_size
  56. *
  57. * 0. all entities are page_size aligned in flash
  58. * 1. kernel and ramdisk are required (size != 0)
  59. * 2. second is optional (second_size == 0 -> no second)
  60. * 3. load each element (kernel, ramdisk, second) at
  61. * the specified physical address (kernel_addr, etc)
  62. * 4. prepare tags at tag_addr. kernel_args[] is
  63. * appended to the kernel commandline in the tags.
  64. * 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
  65. * 6. if second_size != 0: jump to second_addr
  66. * else: jump to kernel_addr
  67. */
  68. #endif