Kernel: Add support for ACPI Embedded Controllers

kernel/include/kernel/ACPI/ACPI.h

@@ -2,6 +2,7 @@
 
 #include <BAN/Vector.h>
 #include <kernel/ACPI/AML/Namespace.h>
+#include <kernel/ACPI/EmbeddedController.h>
 #include <kernel/ACPI/Headers.h>
 #include <kernel/Memory/Types.h>
 #include <kernel/ThreadBlocker.h>
@@ -35,8 +36,12 @@ namespace Kernel::ACPI
 		BAN::ErrorOr<void> poweroff();
 		BAN::ErrorOr<void> reset();
 
+		BAN::ErrorOr<void> register_gpe_handler(uint8_t gpe, void (*callback)(void*), void* argument);
+
 		void handle_irq() override;
 
+		BAN::Span<BAN::UniqPtr<EmbeddedController>> embedded_controllers() { return m_embedded_controllers.span(); }
+
 	private:
 		ACPI() = default;
 		BAN::ErrorOr<void> initialize_impl();
@@ -50,6 +55,12 @@ namespace Kernel::ACPI
 
 		BAN::ErrorOr<void> route_interrupt_link_device(const AML::Scope& device, uint64_t& routed_irq_mask);
 
+		BAN::ErrorOr<void> initialize_embedded_controller(const AML::Scope& embedded_controller);
+		BAN::ErrorOr<void> initialize_embedded_controllers();
+
+		BAN::Optional<GAS> find_gpe_block(size_t index);
+		bool enable_gpe(uint8_t gpe);
+
 	private:
 		paddr_t m_header_table_paddr = 0;
 		vaddr_t m_header_table_vaddr = 0;
@@ -68,8 +79,23 @@ namespace Kernel::ACPI
 
 		ThreadBlocker m_event_thread_blocker;
 
+		BAN::Vector<BAN::UniqPtr<EmbeddedController>> m_embedded_controllers;
+
+		struct GPEHandler
+		{
+			bool has_callback { false };
+			union {
+				AML::Reference* method;
+				struct
+				{
+					void (*callback)(void*);
+					void* argument;
+				};
+			};
+		};
+		bool m_has_any_gpes { false };
 		AML::Scope m_gpe_scope;
-		BAN::Array<AML::Reference*, 0xFF> m_gpe_methods { nullptr };
+		BAN::Array<GPEHandler, 0xFF> m_gpe_methods;
 
 		bool m_hardware_reduced { false };
 		AML::Namespace* m_namespace { nullptr };