Kernel: Parse RSDP from multiboot headers if exists

kernel/include/kernel/BootInfo.h

@@ -3,6 +3,7 @@
 #include <BAN/String.h>
 #include <BAN/StringView.h>
 #include <BAN/Vector.h>
+#include <kernel/RSDP.h>
 
 namespace Kernel
 {
@@ -34,7 +35,8 @@ namespace Kernel
 	struct BootInfo
 	{
 		BAN::String					command_line;
-		FramebufferInfo				framebuffer;
+		FramebufferInfo				framebuffer			{};
+		RSDP						rsdp				{};
 		BAN::Vector<MemoryMapEntry>	memory_map_entries;
 	};
 

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];
+	};
+
+}