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; /* reserved for future expansion: MUST be 0 */ 47 48 /* operating system version and security patch level; for 49 * version "A.B.C" and patch level "Y-M-D": 50 * ver = A << 14 | B << 7 | C (7 bits for each of A, B, C) 51 * lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M) 52 * os_version = ver << 11 | lvl */ 53 uint32_t os_version; 54 55 uint8_t name[BOOT_NAME_SIZE]; /* asciiz product name */ 56 57 uint8_t cmdline[BOOT_ARGS_SIZE]; 58 59 uint32_t id[8]; /* timestamp / checksum / sha1 / etc */ 60 61 /* Supplemental command line data; kept here to maintain 62 * binary compatibility with older versions of mkbootimg */ 63 uint8_t extra_cmdline[BOOT_EXTRA_ARGS_SIZE]; 64 } __attribute__((packed)); 65 66 /* 67 ** +-----------------+ 68 ** | boot header | 1 page 69 ** +-----------------+ 70 ** | kernel | n pages 71 ** +-----------------+ 72 ** | ramdisk | m pages 73 ** +-----------------+ 74 ** | second stage | o pages 75 ** +-----------------+ 76 ** 77 ** n = (kernel_size + page_size - 1) / page_size 78 ** m = (ramdisk_size + page_size - 1) / page_size 79 ** o = (second_size + page_size - 1) / page_size 80 ** 81 ** 0. all entities are page_size aligned in flash 82 ** 1. kernel and ramdisk are required (size != 0) 83 ** 2. second is optional (second_size == 0 -> no second) 84 ** 3. load each element (kernel, ramdisk, second) at 85 ** the specified physical address (kernel_addr, etc) 86 ** 4. prepare tags at tag_addr. kernel_args[] is 87 ** appended to the kernel commandline in the tags. 88 ** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr 89 ** 6. if second_size != 0: jump to second_addr 90 ** else: jump to kernel_addr 91 */ 92 93 #if 0 94 typedef struct ptentry ptentry; 95 96 struct ptentry { 97 char name[16]; /* asciiz partition name */ 98 unsigned start; /* starting block number */ 99 unsigned length; /* length in blocks */ 100 unsigned flags; /* set to zero */ 101 }; 102 103 /* MSM Partition Table ATAG 104 ** 105 ** length: 2 + 7 * n 106 ** atag: 0x4d534d70 107 ** <ptentry> x n 108 */ 109 #endif 110 111 #endif 112
