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/Mutex.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#include <kernel/ACPI/AML/Bytes.h>
+#include <kernel/ACPI/AML/NamedObject.h>
+#include <kernel/ACPI/AML/ParseContext.h>
+
+namespace Kernel::ACPI::AML
+{
+
+	struct Mutex : public AML::NamedObject
+	{
+		uint8_t sync_level;
+
+		Mutex(NameSeg name, uint8_t sync_level)
+			: NamedObject(Node::Type::Mutex, name)
+			, sync_level(sync_level)
+		{}
+
+		static ParseResult parse(ParseContext& context)
+		{
+			ASSERT(context.aml_data.size() >= 2);
+			ASSERT(static_cast<AML::Byte>(context.aml_data[0]) == AML::Byte::ExtOpPrefix);
+			ASSERT(static_cast<AML::ExtOp>(context.aml_data[1]) == AML::ExtOp::MutexOp);
+			context.aml_data = context.aml_data.slice(2);
+
+			auto name = NameString::parse(context.aml_data);
+			if (!name.has_value())
+				return ParseResult::Failure;
+
+			if (context.aml_data.size() < 1)
+				return ParseResult::Failure;
+			auto sync_level = context.aml_data[0];
+			context.aml_data = context.aml_data.slice(1);
+
+			if (sync_level & 0xF0)
+			{
+				AML_ERROR("Invalid sync level {}", sync_level);
+				return ParseResult::Failure;
+			}
+
+			auto mutex = MUST(BAN::RefPtr<Mutex>::create(name->path.back(), sync_level));
+			if (!context.root_namespace->add_named_object(context.scope.span(), name.value(), mutex))
+				return ParseResult::Failure;
+
+#if AML_DEBUG_LEVEL >= 2
+			mutex->debug_print(0);
+			AML_DEBUG_PRINTLN("");
+#endif
+
+			return ParseResult::Success;
+		}
+
+		virtual void debug_print(int indent) const override
+		{
+			AML_DEBUG_PRINT_INDENT(indent);
+			AML_DEBUG_PRINT("Mutex ");
+			name.debug_print();
+			AML_DEBUG_PRINT(" (SyncLevel: {})", sync_level);
+		}
+	};
+
+}