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include/android_image.h
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/* * This is from the Android Project, |
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* Repository: https://android.googlesource.com/platform/system/core/ * File: mkbootimg/bootimg.h * Commit: d162828814b08ada310846a33205befb69ef5799 |
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* * Copyright (C) 2008 The Android Open Source Project * * SPDX-License-Identifier: BSD-2-Clause */ #ifndef _ANDROID_IMAGE_H_ #define _ANDROID_IMAGE_H_ |
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typedef struct andr_img_hdr andr_img_hdr; |
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#define ANDR_BOOT_MAGIC "ANDROID!" #define ANDR_BOOT_MAGIC_SIZE 8 #define ANDR_BOOT_NAME_SIZE 16 #define ANDR_BOOT_ARGS_SIZE 512 |
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#define ANDR_BOOT_EXTRA_ARGS_SIZE 1024 |
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/* 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; |
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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 */ |
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u32 header_version; |
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/* 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; |
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char name[ANDR_BOOT_NAME_SIZE]; /* asciiz product name */ char cmdline[ANDR_BOOT_ARGS_SIZE]; u32 id[8]; /* timestamp / checksum / sha1 / etc */ |
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/* Supplemental command line data; kept here to maintain * binary compatibility with older versions of mkbootimg */ char extra_cmdline[ANDR_BOOT_EXTRA_ARGS_SIZE]; |
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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 */ |
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} __attribute__((packed)); |
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/* * +-----------------+ * | boot header | 1 page * +-----------------+ |
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* | kernel | i pages |
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* +-----------------+ * | ramdisk | m pages * +-----------------+ |
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* | second stage | n pages * +-----------------+ * | recovery dtbo | o pages |
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* +-----------------+ * |
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* i = (kernel_size + page_size - 1) / page_size |
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* m = (ramdisk_size + page_size - 1) / page_size |
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* n = (second_size + page_size - 1) / page_size * o = (recovery_dtbo_size + page_size - 1) / page_size |
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* * 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 */ |
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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; }; |
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#endif |