79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* Copyright (C) 2008 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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#ifndef BOOT_IMG_HDR_H
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#define BOOT_IMG_HDR_H
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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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**
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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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**
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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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#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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struct boot_img_hdr
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{
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unsigned char magic[BOOT_MAGIC_SIZE];
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unsigned kernel_size; /* size in bytes */
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unsigned kernel_addr; /* physical load addr */
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unsigned ramdisk_size; /* size in bytes */
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unsigned ramdisk_addr; /* physical load addr */
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unsigned second_size; /* size in bytes */
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unsigned second_addr; /* physical load addr */
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unsigned tags_addr; /* physical addr for kernel tags */
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unsigned page_size; /* flash page size we assume */
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unsigned unused[2]; /* future expansion: should be 0 */
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unsigned char name[BOOT_NAME_SIZE]; /* asciiz product name */
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unsigned char cmdline[BOOT_ARGS_SIZE];
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unsigned id[8]; /* timestamp / checksum / sha1 / etc */
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};
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typedef struct boot_img_hdr boot_img_hdr;
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#endif
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