Add the multiboot magic value to the startup info struct.

src/Kernel.hh

@@ -25,6 +25,8 @@ struct StartupInformation
     u32 kernelStart;
     /** Ending address (the first address *after* the last) of the kernel. */
     u32 kernelEnd;
+    /** Multiboot's magic value. This should be verified. */
+    u32 multibootMagic;
     /** Pointer to the multiboot information struct. */
     multiboot::Information* multibootInformation;
 };

src/Main.cc

@@ -38,6 +38,7 @@ kmain(multiboot::Information *information,
     kernel::StartupInformation startupInformation;
     startupInformation.kernelStart = u32(&kernelStart);
     startupInformation.kernelEnd = u32(&kernelEnd);
+    startupInformation.multibootMagic = magic;
     startupInformation.multibootInformation = information;
 
     kernel.initialize(startupInformation);