Kernel: Parse RSDP from multiboot headers if exists

kernel/include/kernel/RSDP.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace Kernel
+{
+
+	struct RSDP
+	{
+		uint8_t signature[8];
+		uint8_t checksum;
+		uint8_t oemid[6];
+		uint8_t revision;
+		uint32_t rsdt_address;
+
+		// only in revision >= 2
+		uint32_t length;
+		uint64_t xsdt_address;
+		uint8_t extended_checksum;
+		uint8_t reserved[3];
+	};
+
+}