Kernel: Rewrite whole AML parser

Now AML parsing is actually done while respecting namespaces and
scopes. I implemented the minimal functionality to parse qemu's AML.

Next step is to implement AML interpreting and then we can drop lai
as a dependency.

kernel/include/kernel/ACPI/AML/Field.h

@@ -0,0 +1,89 @@
+#pragma once
+
+#include <kernel/ACPI/AML/NamedObject.h>
+#include <kernel/ACPI/AML/ParseContext.h>
+#include <kernel/ACPI/AML/Pkg.h>
+#include <kernel/ACPI/AML/Region.h>
+
+namespace Kernel::ACPI::AML
+{
+
+	struct FieldRules
+	{
+		enum class AccessType
+		{
+			Any = 0,
+			Byte = 1,
+			Word = 2,
+			DWord = 3,
+			QWord = 4,
+			Buffer = 5,
+		};
+		AccessType access_type;
+
+		enum class LockRule
+		{
+			NoLock = 0,
+			Lock = 1,
+		};
+		LockRule lock_rule;
+
+		enum class UpdateRule
+		{
+			Preserve = 0,
+			WriteAsOnes = 1,
+			WriteAsZeros = 2,
+		};
+		UpdateRule update_rule;
+	};
+
+	struct FieldElement : public NamedObject
+	{
+		uint64_t bit_offset;
+		uint32_t bit_count;
+
+		FieldRules access_rules;
+
+		OpRegion* op_region = nullptr;
+
+		FieldElement(NameSeg name, uint64_t bit_offset, uint32_t bit_count, FieldRules access_rules)
+			: NamedObject(Node::Type::FieldElement, name)
+			, bit_offset(bit_offset)
+			, bit_count(bit_count)
+			, access_rules(access_rules)
+		{}
+
+		void debug_print(int indent) const override;
+	};
+
+	struct Field
+	{
+		static ParseResult parse(ParseContext& context);
+	};
+
+	struct IndexFieldElement : public NamedObject
+	{
+		uint64_t bit_offset;
+		uint32_t bit_count;
+
+		FieldRules access_rules;
+
+		FieldElement* index_element = nullptr;
+		FieldElement* data_element = nullptr;
+
+		IndexFieldElement(NameSeg name, uint64_t bit_offset, uint32_t bit_count, FieldRules access_rules)
+			: NamedObject(Node::Type::IndexFieldElement, name)
+			, bit_offset(bit_offset)
+			, bit_count(bit_count)
+			, access_rules(access_rules)
+		{}
+
+		void debug_print(int indent) const override;
+	};
+
+	struct IndexField
+	{
+		static ParseResult parse(ParseContext& context);
+	};
+
+}