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 #include <stdint.h> 19 20 #ifndef _BOOT_IMAGE_H_ 21 #define _BOOT_IMAGE_H_ 22 23 typedef struct boot_img_hdr boot_img_hdr; 24 25 #define BOOT_MAGIC "ANDROID!" 26 #define BOOT_MAGIC_SIZE 8 27 #define BOOT_NAME_SIZE 16 28 #define BOOT_ARGS_SIZE 512 29 #define BOOT_EXTRA_ARGS_SIZE 1024 30 31 struct boot_img_hdr 32 { 33 uint8_t magic[BOOT_MAGIC_SIZE]; 34 35 uint32_t kernel_size; /* size in bytes */ 36 uint32_t kernel_addr; /* physical load addr */ 37 38 uint32_t ramdisk_size; /* size in bytes */ 39 uint32_t ramdisk_addr; /* physical load addr */ 40 41 uint32_t second_size; /* size in bytes */ 42 uint32_t second_addr; /* physical load addr */ 43 44 uint32_t tags_addr; /* physical addr for kernel tags */ 45 uint32_t page_size; /* flash page size we assume */ 46 uint32_t unused[2]; /* future expansion: should be 0 */ 47 48 uint8_t name[BOOT_NAME_SIZE]; /* asciiz product name */ 49 50 uint8_t cmdline[BOOT_ARGS_SIZE]; 51 52 uint32_t id[8]; /* timestamp / checksum / sha1 / etc */ 53 54 /* Supplemental command line data; kept here to maintain 55 * binary compatibility with older versions of mkbootimg */ 56 uint8_t extra_cmdline[BOOT_EXTRA_ARGS_SIZE]; 57 } __attribute__((packed)); 58 59 /* 60 ** +-----------------+ 61 ** | boot header | 1 page 62 ** +-----------------+ 63 ** | kernel | n pages 64 ** +-----------------+ 65 ** | ramdisk | m pages 66 ** +-----------------+ 67 ** | second stage | o pages 68 ** +-----------------+ 69 ** 70 ** n = (kernel_size + page_size - 1) / page_size 71 ** m = (ramdisk_size + page_size - 1) / page_size 72 ** o = (second_size + page_size - 1) / page_size 73 ** 74 ** 0. all entities are page_size aligned in flash 75 ** 1. kernel and ramdisk are required (size != 0) 76 ** 2. second is optional (second_size == 0 -> no second) 77 ** 3. load each element (kernel, ramdisk, second) at 78 ** the specified physical address (kernel_addr, etc) 79 ** 4. prepare tags at tag_addr. kernel_args[] is 80 ** appended to the kernel commandline in the tags. 81 ** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr 82 ** 6. if second_size != 0: jump to second_addr 83 ** else: jump to kernel_addr 84 */ 85 86 #if 0 87 typedef struct ptentry ptentry; 88 89 struct ptentry { 90 char name[16]; /* asciiz partition name */ 91 unsigned start; /* starting block number */ 92 unsigned length; /* length in blocks */ 93 unsigned flags; /* set to zero */ 94 }; 95 96 /* MSM Partition Table ATAG 97 ** 98 ** length: 2 + 7 * n 99 ** atag: 0x4d534d70 100 ** <ptentry> x n 101 */ 102 #endif 103 104 #endif 105