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Utilities: Add fdtdump for dumping OpenFirmware Device Trees

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Use the new LibDeviceTree to dump the contents of the device tree blob
(Flattened Device Tree) file passed on the command line.
This commit is contained in:
Andrew Kaster 2021-10-17 19:10:47 -06:00 • committed by Brian Gianforcaro
parent 644928314a
commit 259ef76504
2 changed files with 45 additions and 0 deletions
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44
Userland/Utilities/fdtdump.cpp Normal file
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/*
* Copyright (c) 2021, Andrew Kaster <akaster@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/MappedFile.h>
#include <AK/String.h>
#include <LibCore/ArgsParser.h>
#include <LibDeviceTree/Validation.h>
#include <serenity.h>
int main(int argc, char* argv[])
{
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
String filename;
Core::ArgsParser args;
args.add_positional_argument(filename, "File to process", "file", Core::ArgsParser::Required::Yes);
args.parse(argc, argv);
// FIXME: Figure out how to do this sanely from stdin
auto maybe_file = MappedFile::map(filename);
if (maybe_file.is_error()) {
warnln("Unable to dump device tree from file {}: {}", filename, maybe_file.error().string());
return 1;
}
auto file = maybe_file.release_value();
if (file->size() < sizeof(DeviceTree::FlattenedDeviceTreeHeader)) {
warnln("Not enough data in {} to contain a device tree header!", filename);
return 1;
}
auto* fdt_header = reinterpret_cast<DeviceTree::FlattenedDeviceTreeHeader const*>(file->data());
bool valid = DeviceTree::dump(*fdt_header, static_cast<u8 const*>(file->data()), file->size());
return valid ? 0 : 1;
}