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21a21c6a11
This makes it easier to work with device tree nodes and properties, then writing simple state machines to parse the device tree. This also makes the old slow traversal methods use the DeviceTreeProperty helper class, and adds a simple test.
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/*
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* Copyright (c) 2021, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteString.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/MappedFile.h>
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#include <LibCore/System.h>
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#include <LibDeviceTree/FlattenedDeviceTree.h>
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#include <LibDeviceTree/Validation.h>
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#include <LibMain/Main.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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ByteString filename;
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Core::ArgsParser args;
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args.add_positional_argument(filename, "File to process", "file", Core::ArgsParser::Required::Yes);
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args.parse(arguments);
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// FIXME: Figure out how to do this sanely from stdin
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auto file = TRY(Core::MappedFile::map(filename));
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if (TRY(file->size()) < sizeof(DeviceTree::FlattenedDeviceTreeHeader)) {
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warnln("Not enough data in {} to contain a device tree header!", filename);
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return 1;
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}
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auto const* fdt_header = reinterpret_cast<DeviceTree::FlattenedDeviceTreeHeader const*>(file->data());
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auto bytes = file->bytes();
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TRY(DeviceTree::dump(*fdt_header, bytes));
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auto compatible = TRY(DeviceTree::slow_get_property("/compatible"sv, *fdt_header, bytes)).as_strings();
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dbgln("compatible with: {}", compatible);
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auto bootargs = TRY(DeviceTree::slow_get_property("/chosen/bootargs"sv, *fdt_header, bytes)).as_string();
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dbgln("bootargs: {}", bootargs);
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auto cpu_compatible = TRY(DeviceTree::slow_get_property("/cpus/cpu@0/compatible"sv, *fdt_header, bytes)).as_string();
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dbgln("cpu0 compatible: {}", cpu_compatible);
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return 0;
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}
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