Kernel: Add MMUScope

This disables interrupts and loads specified mmu for the
scope it lives in

kernel/include/kernel/Memory/MMUScope.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <kernel/CriticalScope.h>
+#include <kernel/Memory/MMU.h>
+
+namespace Kernel
+{
+
+	class MMUScope
+	{
+	public:
+		MMUScope(MMU& mmu)
+			: m_old(MMU::current())
+			, m_temp(mmu)
+		{
+			if (&m_old != &m_temp)
+				m_temp.load();
+		}
+		~MMUScope()
+		{
+			if (&m_old != &m_temp)
+				m_old.load();
+		}
+	private:
+		CriticalScope m_scope;
+		MMU& m_old;
+		MMU& m_temp;
+	};
+
+}