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LibDeviceTree: Add a slow, allocation-free property fetch API

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Using the walk_device_tree helper, we can walk the device tree from the
beginning looking for a specific property node. It's still missing the
ability to get property lists, string lists, and property-specific data.
This commit is contained in:
Andrew Kaster 2023-02-12 15:52:16 -07:00 • committed by Linus Groh
parent e9e279bb77
commit 613cfb31b1
3 changed files with 95 additions and 0 deletions
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11
Userland/Utilities/fdtdump.cpp
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@ -8,6 +8,7 @@
#include <LibCore/ArgsParser.h>
#include <LibCore/MappedFile.h>
#include <LibCore/System.h>
#include <LibDeviceTree/FlattenedDeviceTree.h>
#include <LibDeviceTree/Validation.h>
#include <LibMain/Main.h>
@ -34,5 +35,15 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TRY(DeviceTree::dump(*fdt_header, bytes));
auto compatible = TRY(DeviceTree::slow_get_property<StringView>("/compatible"sv, *fdt_header, bytes));
auto compatible_strings = compatible.split_view('\0');
dbgln("compatible with: {}", compatible_strings);
auto bootargs = TRY(DeviceTree::slow_get_property<StringView>("/chosen/bootargs"sv, *fdt_header, bytes));
dbgln("bootargs: {}", bootargs);
auto cpu_compatible = TRY(DeviceTree::slow_get_property<StringView>("/cpus/cpu@0/compatible"sv, *fdt_header, bytes));
dbgln("cpu0 compatible: {}", cpu_compatible);
return 0;
}