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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
commit 21a21c6a11
Notes: sideshowbarker 2024-07-17 02:55:44 +09:00
10 changed files with 316 additions and 31 deletions
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23
Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.cpp
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@ -9,6 +9,7 @@
#include <AK/IterationDecision.h>
#include <AK/MemoryStream.h>
#include <AK/StringView.h>
#include <LibDeviceTree/DeviceTree.h>
#include <LibDeviceTree/FlattenedDeviceTree.h>
#ifdef KERNEL
@ -137,6 +138,7 @@ static ErrorOr<ReadonlyBytes> slow_get_property_raw(StringView name, FlattenedDe
++current_path_idx; // Root node
return IterationDecision::Continue;
}
// FIXME: This might need to ignore address details in the path
if (token_name == path[current_path_idx]) {
++current_path_idx;
if (current_path_idx == static_cast<ssize_t>(path.size() - 1)) {
@ -169,26 +171,9 @@ static ErrorOr<ReadonlyBytes> slow_get_property_raw(StringView name, FlattenedDe
return found_property_value;
}
template<typename T>
ErrorOr<T> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree)
ErrorOr<DeviceTreeProperty> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree)
{
[[maybe_unused]] auto bytes = TRY(slow_get_property_raw(name, header, raw_device_tree));
if constexpr (IsVoid<T>) {
return {};
} else if constexpr (IsArithmetic<T>) {
if (bytes.size() != sizeof(T)) {
return Error::from_errno(EINVAL);
}
return *bit_cast<T*>(bytes.data());
} else {
static_assert(IsSame<T, StringView>);
return T(bytes);
}
return DeviceTreeProperty { TRY(slow_get_property_raw(name, header, raw_device_tree)) };
}
template ErrorOr<void> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
template ErrorOr<u32> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
template ErrorOr<u64> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
template ErrorOr<StringView> slow_get_property(StringView name, FlattenedDeviceTreeHeader const& header, ReadonlyBytes raw_device_tree);
} // namespace DeviceTree