128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* tools/mkbootimg/bootimg.h
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**
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** Copyright 2007, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stdint.h>
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#include "types.h"
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#ifndef _BOOT_IMAGE_H_
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#define _BOOT_IMAGE_H_
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typedef struct boot_img_hdr boot_img_hdr;
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#define BOOT_MAGIC "ANDROID!"
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#define BOOT_MAGIC_SIZE 8
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#define BOOT_NAME_SIZE 16
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#define BOOT_ARGS_SIZE 512
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#define BOOT_EXTRA_ARGS_SIZE 1024
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struct boot_img_hdr
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{
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uint8_t magic[BOOT_MAGIC_SIZE];
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uint32_t kernel_size; /* size in bytes */
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uint32_t kernel_addr; /* physical load addr */
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uint32_t ramdisk_size; /* size in bytes */
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uint32_t ramdisk_addr; /* physical load addr */
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uint32_t second_size; /* size in bytes */
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uint32_t second_addr; /* physical load addr */
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uint32_t tags_addr; /* physical addr for kernel tags */
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uint32_t page_size; /* flash page size we assume */
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uint32_t extra_size; /* extra blob size in bytes */
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/* operating system version and security patch level; for
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* version "A.B.C" and patch level "Y-M-D":
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* ver = A << 14 | B << 7 | C (7 bits for each of A, B, C)
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* lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M)
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* os_version = ver << 11 | lvl */
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uint32_t os_version;
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uint8_t name[BOOT_NAME_SIZE]; /* asciiz product name */
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uint8_t cmdline[BOOT_ARGS_SIZE];
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uint32_t id[8]; /* timestamp / checksum / sha1 / etc */
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/* Supplemental command line data; kept here to maintain
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* binary compatibility with older versions of mkbootimg */
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uint8_t extra_cmdline[BOOT_EXTRA_ARGS_SIZE];
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} __attribute__((packed));
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/*
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** +-----------------+
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** | boot header | 1 page
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** +-----------------+
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** | kernel | n pages
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** +-----------------+
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** | ramdisk | m pages
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** +-----------------+
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** | second stage | o pages
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** +-----------------+
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** | extra blobs | p pages
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** +-----------------+
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**
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** n = (kernel_size + page_size - 1) / page_size
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** m = (ramdisk_size + page_size - 1) / page_size
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** o = (second_size + page_size - 1) / page_size
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** p = (extra_size + page_size - 1) / page_size
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**
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** 0. all entities are page_size aligned in flash
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** 1. kernel and ramdisk are required (size != 0)
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** 2. second is optional (second_size == 0 -> no second)
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** 3. load each element (kernel, ramdisk, second) at
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** the specified physical address (kernel_addr, etc)
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** 4. prepare tags at tag_addr. kernel_args[] is
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** appended to the kernel commandline in the tags.
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** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
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** 6. if second_size != 0: jump to second_addr
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** else: jump to kernel_addr
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*/
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typedef struct mtk_hdr {
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uint8_t magic[4]; /* MTK magic */
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uint32_t size; /* Size of the content */
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uint8_t name[32]; /* The type of the header */
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} mtk_hdr;
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// Flags
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#define MTK_KERNEL 0x1
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#define MTK_RAMDISK 0x2
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#define CHROMEOS_FLAG 0x4
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typedef struct boot_img {
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size_t map_size;
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uint32_t dt_size;
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size_t tail_size;
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uint8_t flags;
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file_t kernel_type, ramdisk_type;
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boot_img_hdr hdr;
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mtk_hdr mtk_kernel_hdr, mtk_ramdisk_hdr;
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void *map_addr;
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void *kernel;
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void *dtb;
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void *ramdisk;
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void *second;
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void *extra;
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void *tail;
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} boot_img;
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#endif
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