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LibDeviceTree: Add a simple DeviceTree class

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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.
This commit is contained in:
Hediadyoin1 2024-02-14 14:57:17 +01:00 • committed by Andrew Kaster
parent 0fa718ead8
commit 21a21c6a11
10 changed files with 316 additions and 31 deletions
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10
Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h
View file

@ -13,6 +13,8 @@
#include <AK/StringView.h>
#include <AK/Types.h>
#include "DeviceTree.h"
namespace DeviceTree {
// https://devicetree-specification.readthedocs.io/en/v0.3/flattened-format.html
@ -60,12 +62,6 @@ 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);
ErrorOr<DeviceTreeProperty> slow_get_property(StringView name, FlattenedDeviceTreeHeader const&, ReadonlyBytes raw_device_tree);
} // namespace DeviceTree