1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef DT_TABLE_H 18 #define DT_TABLE_H 19 20 #include <stdint.h> 21 22 /* 23 * For the image layout, refer README.md for the detail 24 */ 25 26 #define DT_TABLE_MAGIC 0xd7b7ab1e 27 #define DT_TABLE_DEFAULT_PAGE_SIZE 2048 28 #define DT_TABLE_DEFAULT_VERSION 0 29 30 struct dt_table_header { 31 uint32_t magic; /* DT_TABLE_MAGIC */ 32 uint32_t total_size; /* includes dt_table_header + all dt_table_entry 33 and all dtb/dtbo */ 34 uint32_t header_size; /* sizeof(dt_table_header) */ 35 36 uint32_t dt_entry_size; /* sizeof(dt_table_entry) */ 37 uint32_t dt_entry_count; /* number of dt_table_entry */ 38 uint32_t dt_entries_offset; /* offset to the first dt_table_entry 39 from head of dt_table_header. 40 The value will be equal to header_size if 41 no padding is appended */ 42 43 uint32_t page_size; /* flash page size we assume */ 44 uint32_t version; /* DTBO image version, the current version is 0. 45 The version will be incremented when the dt_table_header 46 struct is updated. */ 47 }; 48 49 struct dt_table_entry { 50 uint32_t dt_size; 51 uint32_t dt_offset; /* offset from head of dt_table_header */ 52 53 uint32_t id; /* optional, must be zero if unused */ 54 uint32_t rev; /* optional, must be zero if unused */ 55 uint32_t custom[4]; /* optional, must be zero if unused */ 56 }; 57 58 void dt_table_header_init(struct dt_table_header *header); 59 60 #endif 61
