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644928314a
Starting with header validation and a dump() method that can be used to debug future parsing work.
41 lines
2.1 KiB
C++
41 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Endian.h>
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#include <AK/Types.h>
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namespace DeviceTree {
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// https://devicetree-specification.readthedocs.io/en/v0.3/flattened-format.html
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struct FlattenedDeviceTreeHeader {
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BigEndian<u32> magic; // 0xDOODFEED (BE)
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BigEndian<u32> totalsize; // Total size of entire blob including padding b/w and after fields
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BigEndian<u32> off_dt_struct; // Offset of StructureBlock from beginning of header
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// https://devicetree-specification.readthedocs.io/en/v0.3/flattened-format.html#sect-fdt-structure-block
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BigEndian<u32> off_dt_strings; // Offset of StringsBlock from beginning of header
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// https://devicetree-specification.readthedocs.io/en/v0.3/flattened-format.html#sect-fdt-strings-block
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BigEndian<u32> off_mem_rsvmap; // Offset of MemoryReservationBlock from beginning of header
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BigEndian<u32> version; // 0.3 spec defines version 17
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BigEndian<u32> last_comp_version; // 0.3 spec back-compatible with version 16, mandated to be 16
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BigEndian<u32> boot_cpuid_phys; // Physical ID given in `reg` property of CPU node of boot cpu
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BigEndian<u32> size_dt_strings; // Length in bytes of StringsBlock
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BigEndian<u32> size_dt_struct; // Length in bytes of StructureBlock
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};
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static_assert(sizeof(FlattenedDeviceTreeHeader) == 40, "FDT Header size must match specification");
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// https://devicetree-specification.readthedocs.io/en/v0.3/flattened-format.html#format
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struct FlattenedDeviceTreeReserveEntry {
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BigEndian<u64> address;
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BigEndian<u64> size;
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bool operator==(FlattenedDeviceTreeReserveEntry const& other) const { return other.address == address && other.size == size; }
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bool operator!=(FlattenedDeviceTreeReserveEntry const& other) const { return !(operator==(other)); }
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};
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static_assert(sizeof(FlattenedDeviceTreeReserveEntry) == 16, "FDT Memory Reservation entry size must match specification");
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} // namespace DeviceTree
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