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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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8
Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h
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@ -60,4 +60,12 @@ struct DeviceTreeCallbacks {
ErrorOr<void> walk_device_tree(FlattenedDeviceTreeHeader const&, ReadonlyBytes raw_device_tree, DeviceTreeCallbacks);
template<typename T>
ErrorOr<T> slow_get_property(StringView name, FlattenedDeviceTreeHeader const&, ReadonlyBytes raw_device_tree);
extern template ErrorOr<void> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
extern template ErrorOr<u32> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
extern template ErrorOr<u64> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
extern template ErrorOr<StringView> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
} // namespace DeviceTree