1 /* tools/mkbootimg/bootimg.h 2 ** 3 ** Copyright 2007, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifndef _BOOT_IMAGE_H_ 19 #define _BOOT_IMAGE_H_ 20 21 typedef struct boot_img_hdr boot_img_hdr; 22 23 #define BOOT_MAGIC "ANDROID!" 24 #define BOOT_MAGIC_SIZE 8 25 #define BOOT_NAME_SIZE 16 26 #define BOOT_ARGS_SIZE 512 27 28 struct boot_img_hdr 29 { 30 unsigned char magic[BOOT_MAGIC_SIZE]; 31 32 unsigned kernel_size; /* size in bytes */ 33 unsigned kernel_addr; /* physical load addr */ 34 35 unsigned ramdisk_size; /* size in bytes */ 36 unsigned ramdisk_addr; /* physical load addr */ 37 38 unsigned second_size; /* size in bytes */ 39 unsigned second_addr; /* physical load addr */ 40 41 unsigned tags_addr; /* physical addr for kernel tags */ 42 unsigned page_size; /* flash page size we assume */ 43 unsigned unused[2]; /* future expansion: should be 0 */ 44 45 unsigned char name[BOOT_NAME_SIZE]; /* asciiz product name */ 46 47 unsigned char cmdline[BOOT_ARGS_SIZE]; 48 49 unsigned id[8]; /* timestamp / checksum / sha1 / etc */ 50 }; 51 52 /* 53 ** +-----------------+ 54 ** | boot header | 1 page 55 ** +-----------------+ 56 ** | kernel | n pages 57 ** +-----------------+ 58 ** | ramdisk | m pages 59 ** +-----------------+ 60 ** | second stage | o pages 61 ** +-----------------+ 62 ** 63 ** n = (kernel_size + page_size - 1) / page_size 64 ** m = (ramdisk_size + page_size - 1) / page_size 65 ** o = (second_size + page_size - 1) / page_size 66 ** 67 ** 0. all entities are page_size aligned in flash 68 ** 1. kernel and ramdisk are required (size != 0) 69 ** 2. second is optional (second_size == 0 -> no second) 70 ** 3. load each element (kernel, ramdisk, second) at 71 ** the specified physical address (kernel_addr, etc) 72 ** 4. prepare tags at tag_addr. kernel_args[] is 73 ** appended to the kernel commandline in the tags. 74 ** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr 75 ** 6. if second_size != 0: jump to second_addr 76 ** else: jump to kernel_addr 77 */ 78 79 #if 0 80 typedef struct ptentry ptentry; 81 82 struct ptentry { 83 char name[16]; /* asciiz partition name */ 84 unsigned start; /* starting block number */ 85 unsigned length; /* length in blocks */ 86 unsigned flags; /* set to zero */ 87 }; 88 89 /* MSM Partition Table ATAG 90 ** 91 ** length: 2 + 7 * n 92 ** atag: 0x4d534d70 93 ** <ptentry> x n 94 */ 95 #endif 96 97 #endif 98