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 };

kernel/include/kernel/ACPI/EmbeddedController.h

@@ -0,0 +1,69 @@
+#pragma once
+
+#include <BAN/Atomic.h>
+#include <BAN/UniqPtr.h>
+
+#include <kernel/ACPI/AML/Scope.h>
+#include <kernel/Lock/Mutex.h>
+#include <kernel/Thread.h>
+
+namespace Kernel::ACPI
+{
+
+	class EmbeddedController
+	{
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<EmbeddedController>> create(AML::Scope&& scope, uint16_t command_port, uint16_t data_port, BAN::Optional<uint8_t> gpe);
+		~EmbeddedController();
+
+		BAN::ErrorOr<uint8_t> read_byte(uint8_t offset);
+		BAN::ErrorOr<void> write_byte(uint8_t offset, uint8_t value);
+
+		const AML::Scope& scope() const { return m_scope; }
+
+	private:
+		EmbeddedController(AML::Scope&& scope, uint16_t command_port, uint16_t data_port, bool has_gpe)
+			: m_scope(BAN::move(scope))
+			, m_command_port(command_port)
+			, m_data_port(data_port)
+			, m_has_gpe(has_gpe)
+		{ }
+
+	private:
+		void wait_status_bit(uint8_t bit, uint8_t value);
+
+		uint8_t read_one(uint16_t port);
+		void write_one(uint16_t port, uint8_t value);
+
+		static void handle_gpe_wrapper(void*);
+		void handle_gpe();
+
+		BAN::ErrorOr<void> call_query_method(uint8_t notification);
+
+		void thread_task();
+
+		struct Command
+		{
+			uint8_t command;
+			BAN::Optional<uint8_t> data1;
+			BAN::Optional<uint8_t> data2;
+			uint8_t* response;
+			BAN::Atomic<bool> done;
+		};
+		BAN::ErrorOr<void> send_command(Command& command);
+
+	private:
+		const AML::Scope m_scope;
+		const uint16_t m_command_port;
+		const uint16_t m_data_port;
+		const bool m_has_gpe;
+
+		Mutex m_mutex;
+		ThreadBlocker m_thread_blocker;
+
+		BAN::Optional<Command*> m_queued_command;
+
+		Thread* m_thread { nullptr };
+	};
+
+}