jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Andrew Kaster <akaster@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/DeprecatedString.h>
8#include <LibCore/ArgsParser.h>
9#include <LibCore/MappedFile.h>
10#include <LibCore/System.h>
11#include <LibDeviceTree/FlattenedDeviceTree.h>
12#include <LibDeviceTree/Validation.h>
13#include <LibMain/Main.h>
14
15ErrorOr<int> serenity_main(Main::Arguments arguments)
16{
17 TRY(Core::System::pledge("stdio rpath"));
18
19 DeprecatedString filename;
20
21 Core::ArgsParser args;
22 args.add_positional_argument(filename, "File to process", "file", Core::ArgsParser::Required::Yes);
23 args.parse(arguments);
24
25 // FIXME: Figure out how to do this sanely from stdin
26 auto file = TRY(Core::MappedFile::map(filename));
27
28 if (file->size() < sizeof(DeviceTree::FlattenedDeviceTreeHeader)) {
29 warnln("Not enough data in {} to contain a device tree header!", filename);
30 return 1;
31 }
32
33 auto const* fdt_header = reinterpret_cast<DeviceTree::FlattenedDeviceTreeHeader const*>(file->data());
34 auto bytes = ReadonlyBytes { file->data(), file->size() };
35
36 TRY(DeviceTree::dump(*fdt_header, bytes));
37
38 auto compatible = TRY(DeviceTree::slow_get_property<StringView>("/compatible"sv, *fdt_header, bytes));
39 auto compatible_strings = compatible.split_view('\0');
40 dbgln("compatible with: {}", compatible_strings);
41
42 auto bootargs = TRY(DeviceTree::slow_get_property<StringView>("/chosen/bootargs"sv, *fdt_header, bytes));
43 dbgln("bootargs: {}", bootargs);
44
45 auto cpu_compatible = TRY(DeviceTree::slow_get_property<StringView>("/cpus/cpu@0/compatible"sv, *fdt_header, bytes));
46 dbgln("cpu0 compatible: {}", cpu_compatible);
47
48 return 0;
49}