acpi: add APIC irq ack and legacy vector remapping

arch/x86_64/include/arch/acpi/io_apic.hpp

@@ -0,0 +1,39 @@
+#ifndef ARCH_ACPI_IOAPIC_HPP_
+#define ARCH_ACPI_IOAPIC_HPP_
+
+#include <stdint.h>
+#include <socks/status.h>
+#include <socks/queue.h>
+
+namespace arch::acpi {
+	struct io_apic {
+		uint32_t *io_base = nullptr;
+		unsigned int io_first_irq = 0;
+		unsigned int io_nr_irq = 0;
+		queue_entry_t io_entry;
+
+		struct irq_entry {
+			uint64_t irq_vec : 8;
+			uint64_t irq_delivery : 3;
+			uint64_t irq_destmode : 1;
+			uint64_t irq_status : 1;
+			uint64_t irq_polarity : 1;
+			uint64_t irq_irr : 1;
+			uint64_t irq_triggermode : 1;
+			uint64_t irq_mask : 1;
+			uint64_t irq_resv : 39;
+			uint64_t irq_dest : 8;
+		};
+
+		io_apic(uint32_t *base, unsigned int first_irq);
+
+		uint32_t read(uint32_t reg);
+		void write(uint32_t reg, uint32_t val);
+
+		kern_status_t read_irq(unsigned int index, irq_entry &entry);
+		void write_irq(unsigned int index, const irq_entry &entry);
+		void map_irq(unsigned int src, unsigned int dest);
+	};
+}
+
+#endif