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
29struct dt_table_header {
30  uint32_t magic;             /* DT_TABLE_MAGIC */
31  uint32_t total_size;        /* includes dt_table_header + all dt_table_entry
32                                 and all dtb/dtbo */
33  uint32_t header_size;       /* sizeof(dt_table_header) */
34
35  uint32_t dt_entry_size;     /* sizeof(dt_table_entry) */
36  uint32_t dt_entry_count;    /* number of dt_table_entry */
37  uint32_t dt_entries_offset; /* offset to the first dt_table_entry
38                                 from head of dt_table_header.
39                                 The value will be equal to header_size if
40                                 no padding is appended */
41
42  uint32_t page_size;         /* flash page size we assume */
43  uint32_t reserved[1];       /* must be zero */
44};
45
46struct dt_table_entry {
47  uint32_t dt_size;
48  uint32_t dt_offset;         /* offset from head of dt_table_header */
49
50  uint32_t id;                /* optional, must be zero if unused */
51  uint32_t rev;               /* optional, must be zero if unused */
52  uint32_t custom[4];         /* optional, must be zero if unused */
53};
54
55void dt_table_header_init(struct dt_table_header *header);
56
57#endif
58