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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef DT_TABLE_H
#define DT_TABLE_H
#include <stdint.h>
/*
* For the image layout, refer README.md for the detail
*/
#define DT_TABLE_MAGIC 0xd7b7ab1e
#define DT_TABLE_DEFAULT_PAGE_SIZE 2048
#define DT_TABLE_DEFAULT_VERSION 0
struct dt_table_header {
uint32_t magic; /* DT_TABLE_MAGIC */
uint32_t total_size; /* includes dt_table_header + all dt_table_entry
and all dtb/dtbo */
uint32_t header_size; /* sizeof(dt_table_header) */
uint32_t dt_entry_size; /* sizeof(dt_table_entry) */
uint32_t dt_entry_count; /* number of dt_table_entry */
uint32_t dt_entries_offset; /* offset to the first dt_table_entry
from head of dt_table_header.
The value will be equal to header_size if
no padding is appended */
uint32_t page_size; /* flash page size we assume */
uint32_t version; /* DTBO image version, the current version is 0.
The version will be incremented when the dt_table_header
struct is updated. */
};
enum dt_compression_info {
NO_COMPRESSION,
ZLIB_COMPRESSION,
GZIP_COMPRESSION
};
struct dt_table_entry {
uint32_t dt_size;
uint32_t dt_offset; /* offset from head of dt_table_header */
uint32_t id; /* optional, must be zero if unused */
uint32_t rev; /* optional, must be zero if unused */
uint32_t custom[4]; /* optional, must be zero if unused */
};
struct dt_table_entry_v1 {
uint32_t dt_size;
uint32_t dt_offset; /* offset from head of dt_table_header */
uint32_t id; /* optional, must be zero if unused */
uint32_t rev; /* optional, must be zero if unused */
uint32_t flags; /* For version 1 of dt_table_header, the 4 least significant bits
of 'flags' will be used indicate the compression
format of the DT entry as per the enum 'dt_compression_info' */
uint32_t custom[3]; /* optional, must be zero if unused */
};
enum DT_TYPE { DTB, ACPI };
void dt_table_header_init(struct dt_table_header *header, enum DT_TYPE dt_type);
#endif
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